TI TPS62230

TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
2 MHz / 3 MHz Ultra Small Step Down Converter in 1x1.5 SON Package
FEATURES
1
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2 MHz / 3 MHz Switch Frequency
Up to 94% Efficiency
Output Peak Current up to 500mA
Excellent AC and Transient Load Regulation
High PSRR (up to 90dB)
Small External Output Filter Components 1mH/
4.7mF
VIN range from 2.05V to 6V
Optimized Power Save Mode For Low Output
Ripple Voltage
Forced PWM Mode Operation
Typ. 22 mA Quiescent Current
100% Duty Cycle for Lowest Dropout
Small 1 × 1.5 × 0.6mm3 SON Package
12 mm2 Minimum Solution Size
Supports 0.6 mm Maximum Solution Height
Soft Start with typ. 100ms Start Up Time
APPLICATIONS
•
•
•
•
•
•
LDO Replacement
Portable Audio, Portable Media
Cell Phones
Low Power Wireless
Low Power DSP Core Supply
Digital Cameras
VIN
TPS62231
VIN
EN
MODE
CIN
2.2 mF
SW
FB
GND
The TPS6223X device family is a high frequency
synchronous step down DC-DC converter optimized
for battery powered portable applications. It supports
up to 500mA output current and allows the use of tiny
and low cost chip inductors and capacitors.
With a wide input voltage range of 2.05V to 6V the
device supports applications powered by Li-Ion
batteries with extended voltage range. The minimum
input voltage of 2.05V allows as well the operation
from Li-primary or two alkaline batteries. Different
fixed output voltage versions are available from 1.0V
to 3.3V.
The TPS6223X series features switch frequency up
to 3.8MHz. At medium to heavy loads, the converter
operates in PWM mode and automatically enters
Power Save Mode operation at light load currents to
maintain high efficiency over the entire load current
range.
Because of its excellent PSRR and AC load
regulation performance, the device is also suitable to
replace linear regulators to obtain better power
conversion efficiency.
The Power Save Mode in TPS6223X reduces the
quiescent current consumption down to 22mA during
light load operation. It is optimized to achieve very
low output voltage ripple even with small external
component and features excellent ac load regulation.
L
1/2.2 mH
2.05 V - 6 V
DESCRIPTION
VOUT
1.8 V
COUT
4.7 mF
For very noise sensitive applications, the device can
be forced to PWM Mode operation over the entire
load range by pulling the MODE pin high. In the
shutdown mode, the current consumption is reduced
to less than 1mA. The TPS6223X is available in a 1 ×
1.5mm2 6 pin SON package.
Total area
L1
12mm²
V IN
C1
C2
GND
V OUT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
TA
OUTPUT VOLTAGE (2)
FREQUENCY
[MHz]
PACKAGE
DESIGNATOR
ORDERING
TPS62230
2.5 V
3
DRY
TPS62230DRY
GV
TPS62231
1.8 V
3
DRY
TPS62231DRY
GW
TPS62232
1.2 V
3
DRY
TPS62232DRY
GX
TPS62239
1.0 V
3
DRY
TPS62239DRY
OP
TPS622311
1.1V
2
DRY
TPS622311DRY
PA
TPS62235
1.2V
2
DRY
TPS62235DRY
OQ
TPS622313
1.3 V
3
DRY
TPS62213DRY
QG
TPS622314
1.5 V
3
DRY
TPS622314DRY
QF
1.85V
2
DRY
TPS62236DRY
OR
2.0 V
3
DRY
TPS622312DRY
QE
TPS62234
2.1 V
3
DRY
TPS62234DRY
OH
TPS62238
2.25 V
3
DRY
TPS62238DRY
ON
TPS622310
2.3 V
3
DRY
TPS622310DRY
OT
(3)
2.7 V
3
DRY
TPS6223-2.9 (3)
2.9 V
3
DRY
TPS62233
3.0 V
3
DRY
TPS62233DRY
OG
TPS62237
3.3V
2
DRY
TPS62237DRY
OS
PART NUMBER
(1)
–40°C to 85°C TPS62236
TPS622312
TPS6223-2.7
(1)
(2)
(3)
PACKAGE
MARKING
The DRY package is available in tape on reel. Add R suffix to order quantities of 3000 parts per reel, T suffix for 250 parts per reel.
Contact TI for other fixed output voltage options
Device status is product preview, contact TI for more details
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
VI
(1)
VALUE
UNIT
Voltage at VIN and SW Pin (2)
–0.3 to 7
V
Voltage at EN, MODE Pin (2)
–0.3 to VIN +0.3, ≤7
V
–0.3 to 3.6
V
internally limited
A
Voltage at FB Pin
(2)
Peak output current
ESD rating (3)
HBM Human body model
2
CDM Charge device model
1
Machine model
Power dissipation
200
kV
V
Internally limited
TJ
Maximum operating junction temperature
–40 to 125
°C
Tstg
Storage temperature range
–65 to 150
°C
(1)
(2)
(3)
2
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute–maximum–rated conditions for extended periods may affect device reliability.
All voltage values are with respect to network ground terminal.
The human body model is a 100-pF capacitor discharged through a 1.5-kΩ resistor into each pin. The machine model is a 200-pF
capacitor discharged directly into each pin.
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
DISSIPATION RATINGS (1)
(1)
(2)
PACKAGE
RqJA
POWER RATING
FOR TA ≤ 25°C
DERATING FACTOR
ABOVE TA = 25°C
1 × 1.5 SON
234°C/W (2)
420 mW
4.2 mW/°C
Maximum power dissipation is a function of TJ(max), qJA and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = [TJ(max) – TA] /qJA.
This thermal data is measured with high-K board (4 layers board according to JESD51-7 JEDEC standard).
RECOMMENDED OPERATING CONDITIONS
operating ambient temperature TA = –40 to 85°C (unless otherwise noted) (1)
MIN
Supply voltage VIN
(2)
Effective inductance
2.0
VOUT ≤ VIN -1 V (3)
Recommended minimum
supply voltage
Operating virtual junction temperature range, TJ
(3)
(4)
(5)
500 mA maximum IOUT
350mA maximum IOUT
VOUT ≤ 1.8V
(2)
MAX
6
2.2
Effective capacitance
(1)
NOM
2.05
(4)
(5)
2.5
60 mA maximum output current (5)
V
mH
4.7
3.0
UNIT
mF
3.6
2.7
V
2.05
–40
125
°C
In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (TA(max)) is dependent on the maximum operating junction temperature (TJ(max)), the
maximum power dissipation of the device in the application (PD(max)), and the junction-to-ambient thermal resistance of the part/package
in the application (qJA), as given by the following equation: TA(max) = TJ(max) – (qJA × PD(max)).
The minimum required supply voltage for startup is 2.05 V. The part is functional down to the falling UVL (Under Voltage Lockout)
threshold.
For a voltage difference between minimum VIN and VOUT of ≥ 1 V
Typical value applies for TA = 25°C, maximum value applies for TA = 70°C with TJ ≤ 125°C, PCB layout needs to support proper thermal
performance.
Typical value applies for TA = 25°C, maximum value applies for TA = 85°C with TJ ≤ 125°C, PCB layout needs to support proper thermal
performance.
Copyright © 2009–2010, Texas Instruments Incorporated
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3
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, VOUT = 1.8V, EN = VIN, MODE = GND, TA = –40°C to 85°C (1) typical values are at TA = 25°C (unless otherwise
noted), CIN = 2.2mF, L = 2.2mH, COUT = 4.7mF, see parameter measurement information
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY
VIN
Input voltage range
IQ
(2)
2.05
Operating quiescent current
Shutdown current
UVLO
Undervoltage lockout threshold
V
40
mA
22
IOUT = 0mA. PFM mode enabled (Mode = 0)
device switching, VIN = 3.6V, VOUT = 1.2V
25
mA
3
mA
IOUT = 0 mA. Switching with no load
(MODE/DATA = VIN), PWM operation,
VOUT = 1.8V, L = 2.2mH
ISD
6
IOUT = 0mA. PFM mode enabled (Mode = 0)
device not switching
EN = GND (3)
0.1
1
mA
Falling
1.8
1.9
V
Rising
1.9
2.05
V
0.8
1
V
0.01
0.5
mA
600
850
350
480
690
850
1050
mA
550
840
1220
mA
ENABLE, MODE THRESHOLD
VIH
Threshold for detecting high EN, MODE 2.05 V ≤ VIN ≤ 6V , rising edge
TH
VIL TH HYS
Threshold for detecting low EN, MODE
2.05 V ≤ VIN ≤ 6V , falling edge
IIN
Input bias Current, EN, MODE
EN, MODE = GND or VIN = 3.6V
0.4
0.6
V
POWER SWITCH
RDS(ON)
High side MOSFET on-resistance
Low Side MOSFET on-resistance
Forward current limit MOSFET
high-side
ILIMF
VIN = 3.6V, TJmax = 85°C; RDS(ON) max value
VIN = 3.6V, open loop
Forward current limit MOSFET low side
TSD
mΩ
Thermal shutdown
Increasing junction temperature
150
°C
Thermal shutdown hysteresis
Decreasing junction temperature
20
°C
135
ns
40
ns
0.70
V
CONTROLLER
tONmin
Minimum ON time
tOFFmin
Minimum OFF time
VIN 3.6V, VOUT = 1.8V, Mode = high, IOUT = 0 mA
OUTPUT
VREF
Internal Reference Voltage
Output voltage accuracy
(4)
VOUT
tStart
ILK_SW
(1)
(2)
(3)
(4)
(5)
4
VIN = 3.6V, Mode = GND, device operating in PFM
Mode, IOUT = 0mA
VIN = 3.6V, MODE = VIN,
IOUT = 0 mA
TA = 25°C
–2.0%
2.0%
TA = –40°C to 85°C
–2.5%
2.5%
DC output voltage load regulation
PWM operation, Mode = VIN = 3.6V, VOUT = 1.8 V
DC output voltage line regulation
IOUT = 0 mA, Mode = VIN, 2.05V ≤ VIN ≤ 6V
Start-up Time
Time from active EN to VOUT = 1.8V, VIN = 3.6V,
10Ω load
Leakage current into SW pin
0%
VIN = VOUT = VSW = 3.6 V, EN = GND
(5)
0.001
%/mA
0
%/V
100
0.1
ms
0.5
mA
In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (TA(max)) is dependent on the maximum operating junction temperature (TJ(max)), the
maximum power dissipation of the device in the application (PD(max)), and the junction-to-ambient thermal resistance of the
part/package in the application (qJA), as given by the following equation: TA(max) = TJ(max) – (qJA × PD(max)).
The minimum required supply voltage for startup is 2.05V. The part is functional down to the falling UVL (Under Voltage Lockout)
threshold
Shutdown current into VIN pin, includes internal leakage
VIN = VO + 1.0 V
The internal resistor divider network is disconnected from FB pin.
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
DRY PACKAGE
(TOP VIEW)
MODE 1
6
FB
SW 2
5 EN
VIN 3
4
GND
PIN FUNCTIONS
PIN
NAME
NO
I/O
DESCRIPTION
VIN
3
PWR
VIN power supply pin.
GND
4
PWR
GND supply pin
EN
5
IN
SW
2
OUT
FB
6
IN
Feedback Pin for the internal regulation loop. Connect this pin directly to the output capacitor.
MODE
1
IN
MODE pin = high forces the device to operate in PWM mode. Mode = low enables the Power Save Mode
with automatic transition from PFM (Pulse frequency mode) to PWM (pulse width modulation) mode.
This is the enable pin of the device. Pulling this pin to low forces the device into shutdown mode. Pulling
this pin to high enables the device. This pin must be terminated.
This is the switch pin and is connected to the internal MOSFET switches. Connect the inductor to this
terminal
FUNCTIONAL BLOCK DIAGRAM
VIN
VREF
0.70 V
Bandgap
Undervoltage
Lockout
Current
Limit Comparator
Limit
High Side
MODE
MODE
PMOS
Softstart
VIN
Min. On Time
FB
EN
Control
Logic
Min. OFF Time
Gate Driver
Anti
Shoot-Through
VREF
SW
NMOS
FB
Limit
Low Side
Integrated
Feed Back
Network
Error
Comparator
Thermal
Shutdown
Zero/Negative
Current Limit Comparator
EN
GND
Copyright © 2009–2010, Texas Instruments Incorporated
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
PARAMETER MEASUREMENT INFORMATION
VIN = 2.05 V to 6 V
TPS6223X
VIN
CIN
2.2 mF
EN
MODE
L = 1/2.2 mH
VOUT
SW
FB
COUT
GND
4.7 mF
CIN: Murata GRM155R60J225ME15D 2.2 mF 0402 size
COUT: Murata GRM188R60J475ME 4.7 mF 0603 size, VOUT >= 1.8 V
COUT: Taiyo Yuden AMK105BJ475MV 4.7 mF 0402 size, VOUT = 1.2 V
l: Murata LQM2HPN1R0MJ0
1 mH, LQM2HPN2R2MJ0 2.2 mH,
3
size 2.5x2.0x1.2mm
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
h
Efficiency
vs Load current
h
Efficiency
vs Output Current
8, 9, 10, 11
VO
Output voltage
vs Output current
12, 13, 14, 15,
16, 17
Switching frequency
vs Output current
18, 19, 20, 21,
22, 23, 24, 25,
26, 27
IQ
Quiescent current
vs Ambient temperature
28
ISD
Shutdown current
vs Ambient temperature
29
PMOS Static drain-source on-state resistance
vs Supply voltage and ambient temperature
30
NMOS Static drain-source on-state resistance
vs Supply voltage and ambient temperature
31
Power supply rejection ratio
vs Frequency
32
rDS(ON)
PSRR
Typical operation
Line transient response
Mode transition PFM / forced PWM
AC - load regulation performance
Load transient response
Start-up
6
1, 2, 3, 4, 5, 6, 7
33, 34, 35
PFM
36
PWM
37
38
39, 40, 41
42, 43, 44, 45
46, 47
Spurious Output Noise, 12R Load
48
Spurious Output Noise, 100R Load
49
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
100
100
VIN = 3.6 V
80
VIN = 2.9 V
70
VIN = 5 V
50
40
30
L = 2.2 mH (LQM2HPN2R2MJ0)
COUT = 4.7 mF
10
0
0.1
VIN = 4.2 V
60
VIN = 5 V
50
40
30
MODE = GND,
VOUT = 2.5V,
20
VIN = 3.6 V
80
VIN = 4.2 V
Efficiency -%
Efficiency -%
70
60
VIN = 2.9 V
90
90
20
MODE = VIN,
VOUT = 2.5 V,
10
L = 2.2 mH (LQM2HPN2R2MJ0)
COUT = 4.7 mF
0
1
10
100
IO - Output Current - mA
1
1000
Figure 1. Efficiency PFM/PWM Mode 2.5V Output Voltage
10
100
IO - Output Current - mA
1000
Figure 2. Efficiency Forced PWM Mode 2.5V Output Voltage
100
100
VIN = 2.3 V
90
90
80
VIN = 3.3 V
80
VIN = 2.7 V
Efficiency -%
Efficiency -%
VIN = 3.6 V
60
VIN = 4.2 V
50
VIN = 5 V
20
10
L = 2.2 mH (MIPSA25202R2),
COUT = 4.7 mF
0
0.1
VIN = 3.3 V
60
VIN = 3.6 V
50
VIN = 4.2 V
40
VIN = 5 V
30
30
MODE = GND,
VOUT = 1.8 V,
VIN = 2.7 V
70
70
40
VIN = 2.3 V
20
MODE = VIN,
VOUT = 1.8 V,
10
L = 2.2 mH (MIPSA25202R2),
COUT = 4.7 mF
0
1
10
100
IO - Output Current - mA
1000
Figure 3. Efficiency PFM/PWM MODE 1.8V Output Voltage
Copyright © 2009–2010, Texas Instruments Incorporated
1
10
100
IO - Output Current - mA
1000
Figure 4. Efficiency Forced PWM Mode 1.8V Output voltage
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
100
100
90
VIN = 2.3 V
90
40
VIN = 3.6 V
Efficiency -%
Efficiency -%
50
70
VIN = 2.7 V
70
60
VIN = 4.2 V
VIN = 5 V
30
VIN = 2.7 V
60
VIN = 3.6 V
VIN = 4.2 V
50
VIN = 5 V
40
30
20
MODE = GND,
VOUT = 1.2 V,
10
L = 2.2 mH MIPSZ2012 2R2 (2012 size),
COUT = 4.7 mF
0
0.1
VIN = 2.3 V
80
80
20
MODE = VIN,
VOUT = 1.2 V,
10
L = 2.2 mH MIPSZ2012 2R2 (2012 size),
COUT = 4.7 mF
0
1
10
100
IO - Output Current - mA
1000
Figure 5. Efficiency PFM/PWM Mode 1.2V Output voltage
1
10
100
IO - Output Current - mA
Figure 6. Efficiency Forced PWM Mode 1.2V Output Voltage
100
90
VIN = 3.6 V
90
85
80
70
MIPSD1R0
L = 1 mH 0805
(2x1.25x1mm3)
MIPSA25202R2
L = 2.2 mH
(2.5x2x1.2mm3)
LQM2HPN1R0MJ0
L = 1 mH
(2.5x2x1.2mm3)
MIPSZ2012D2R2
L = 2.2 mH 0805
(2x1.25x1mm3)
65
60
55
50
0.1
LQM21PN2R2
L = 2.2 mH 0805
(2x1.25x0.55mm3)
COUT = 4.7 mF (0402),
VOUT = 1.8 V,
VIN = 3.6 V
1000
Figure 7. Comparison Efficiency vs Inductor Value and Size
8
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VIN = 4.2 V
60
50
40
30
MODE = GND,
CIN = 2.2 mF (0402),
1
10
100
IO - Output Current - mA
VIN = 5 V
70
Efficiency - %
Efficiency -%
80
75
1000
TPS62233
MODE = GND,
VOUT = 3 V,
20
L = 1 mH,
COUT = 4.7 mF
10
0
0.1
1
10
100
IO - Output Current - mA
1000
Figure 8. Comparison Efficiency vs IOUT – TPS62233
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
100
90
VIN = 3.3 V
VIN = 3.3 V
90
80
VIN = 3.6 V
80
VIN = 4.2 V
Efficiency - %
Efficiency - %
70
60
70
VIN = 3.6 V
VIN = 4.2 V
60
50
50
40
30
0.1
40
VOUT = 1.2 V PFM,
MODE = GND
1
10
100
IO - Output Current - mA
30
0.1
1000
1
10
100
IO - Output Current - mA
1000
Figure 9. Comparison Efficiency vs IOUT – TPS62235
Figure 10. Comparison Efficiency vs IOUT – TPS62236
90
2.575
VIN = 3.3 V
MODE = VIN,
VOUT = 2.5 V,
2.55
80
VO - Output Voltage (DC) - V
VIN = 3.6 V
VIN = 4.2 V
70
Efficiency - %
TPS62236
VOUT = 1.85 V PFM
60
50
40
30
0.1
10
100
IO - Output Current - mA
1000
Figure 11. Comparison Efficiency vs IOUT – TPS622311
Copyright © 2009–2010, Texas Instruments Incorporated
VIN = 3.3 V
VIN = 3.6 V
2.5
VIN = 4.2 V
2.475
VIN = 5 V
2.45
TPS622311
VOUT = 1.1 V PFM
1
2.525
L = 1 mH,
COUT = 4.7 mF,
TA = 25°C
2.425
0.1
1
10
100
IO - Output Current - mA
1000
Figure 12. 2.5V Output Voltage Accuracy forced PWM Mode
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9
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
2.575
VIN = 4.2 V
2.525
2.5
VIN = 5 V
VIN = 3.3 V
VIN = 3.6 V
2.475
MODE = GND,
VOUT = 1.8 V,
1.836
VO - Output Voltage (DC) - V
L = 1 mH,
COUT = 4.7 mF,
TA = 25°C
2.55
VO - Output Voltage (DC) - V
1.854
MODE = GND,
VOUT = 2.5 V,
2.425
0.1
1
10
100
IO - Output Current - mA
VIN = 3.6 V
VIN = 3.3 V
1.8
VIN = 4.2 V
1.782
1.746
0.01
1000
Figure 13. 2.5V Output Voltage Accuracy PFM/PWM Mode
VIN = 5 V
1.818
1000
MODE = VIN,
VOUT = 1.2 V,
L = 1 mH,
COUT = 4.7 mF,
TA = 25°C
1.224
VIN = 3.3 V
VIN = 3.6 V
1.8
VIN = 5 V
VIN = 4.2 V
1.782
1.212
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
VIN = 3.3 V
VIN = 3.6 V
1.2
VIN = 4.2 V
1.188
VIN = 5 V
1.176
1.764
1.746
0.1
1
10
100
IO - Output Current - mA
1.236
MODE = VIN,
VOUT = 1.8 V,
VO - Output Voltage (DC) - V
1.836
0.1
Figure 14. 1.8V Output Voltage Accuracy PFM/PWM Mode
1.854
VO - Output Voltage (DC) - V
1.818
1.764
2.45
1
10
100
IO - Output Current - mA
1000
Figure 15. 1.8V Output Voltage Accuracy Forced PWM MODE
10
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
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1.164
0.1
1
10
100
IO - Output Current - mA
1000
Figure 16. 1.2V Output Voltage Accuracy Forced PWM MODE
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
1.236
4000
MODE = GND,
VOUT = 1.2 V,
VIN = 5 V
3500
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
VIN = 4.2 V
3000
VIN = 3.3 V
1.212
f - Frequency - kHz
VO - Output Voltage (DC) - V
1.224
VIN = 3.6 V
1.2
VIN = 4.2 V
1.188
VIN = 5 V
VIN = 3.6 V
VIN = 3.3 V
2500
2000
1500
1000
1.176
0
0.1
1
10
IO - Output Current - mA
100
0
1000
Figure 17. 1.2V Output Voltage Accuracy PFM/PWM MODE
100
200
300
400
IO - Output Current - mA
500
Figure 18. Switching Frequency vs Output Current, 1.8V Output
Voltage MODE = GND
4000
4000
VIN = 5 V
VIN = 5 V
VIN = 4.2 V
3500
VIN = 4.2 V
VIN = 3.6 V
3500
VIN = 3.6 V
3000
3000
VIN = 3.3 V
VIN = 3.3 V
f - Frequency - kHz
f - Frequency - kHz
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
VIN = 2.3 V
500
1.164
0.01
MODE = GND,
VOUT = 1.8 V,
VIN = 2.7 V
2500
2000
1500
1000
VIN = 2.7 V
VIN = 2.3 V
500
MODE = GND,
VOUT = 1.8 V,
2500
2000
1500
1000
L = 1 mH,
COUT = 4.7 mF,
TA = 25°C
VIN = 2.7 V
VIN = 2.3 V
500
MODE = VIN,
VOUT = 1.8 V,
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
0
0
0
100
200
300
400
IO - Output Current - mA
500
Figure 19. Switching Frequency vs Output Current, 1.8V Output
Voltage MODE = GND
Copyright © 2009–2010, Texas Instruments Incorporated
0
100
200
300
400
IO - Output Current - mA
500
Figure 20. Switching Frequency vs Output Current, 1.8V Output
Voltage MODE = VIN
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
4000
4000
3500
VIN = 5 V
VIN = 3.6 V
VIN = 3.3 V
f - Frequency - kHz
3000
2500
VIN = 3.6 V
2000
VIN = 3.3 V
1500
VIN = 3 V
500
2500
2000
1500
VIN = 3 V
500
0
0
0
100
200
300
400
IO - Output Current - mA
0
500
Figure 21. Switching Frequency vs Output Current, 2.5V Output
Voltage MODE = GND
100
500
3000
VIN = 5 V
VIN = 5 V
VIN = 4.2 V
3000
2500
VIN = 4.2 V
VIN = 3.3 V
2500
VIN = 3.6 V
f - Frequency - kHz
VIN = 3.6 V
VIN = 2.7 V
2000
1500
VIN = 2.3 V
1000
VIN = 2 V
MODE = GND,
VOUT = 1.2 V,
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
500
0
0
200
300
400
IO - Output Current - mA
Figure 22. Switching Frequency vs Output Current, 2.5V Output
Voltage MODE = VIN
3500
f - Frequency - kHz
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
1000
1000
VIN = 3.3 V
2000
1500
VIN = 2.3 V
VIN = 2 V
1000
200
300
400
IO - Output Current - mA
500
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VIN = 2.7 V
MODE = VIN,
VOUT = 1.2 V,
500
L = 2.2 mH,
COUT = 4.7 mF,
TA = 25°C
0
100
Figure 23. Switching Frequency vs Output Current, 1.2V Output
Voltage MODE = GND
12
MODE = VIN,
VOUT = 2.5 V,
VIN = 4.2 V
3500
L = 2.2 mH,
VIN = 4.2 V COUT = 4.7 mF,
TA = 25°C
3000
f - Frequency - kHz
VIN = 5 V
MODE = GND,
VOUT = 2.5 V,
0
100
200
300
400
IO - Output Current - mA
500
Figure 24. Switching Frequency vs Output Current, 1.2V Output
Voltage MODE = VIN
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
3000
2500
VIN = 5 V
VIN = 4.2 V
1500
VIN = 2.3 V
VIN = 2.7 V
VIN = 3.3 V
1000
VIN = 4.2 V
f - Frequency - KHz
f - Frequency - KHz
2000
2000
1500
VIN = 3.3 V
VIN = 2.7 V
500
L = 2.2 mH,
COUT = 4.7 mF
0
0
VIN = 2.3 V
0
TPS62236
MODE = GND,
VOUT = 1.85 V,
L = 2.2 mH,
COUT = 4.7 mF
0
0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
IO - Output Current - A
Figure 25. Switching Frequency vs Output Current, 1.2V Output
Voltage MODE = PFM – TPS62235
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
IO - Output Current - A
Figure 26. Switching Frequency vs Output Current, 1.85V
Output Voltage MODE = PFM –TPS62236
35
3000
TA = 85°C
2500
1500
VIN = 2.7 V
VIN = 3.3 V
VIN = 2.3 V
1000
TPS622311
MODE = GND,
VOUT = 1.1 V,
500
IQ - Quiescent Current - mA
VIN = 4.2 V
2000
TA = 60°C
30
VIN = 5 V
f - Frequency - KHz
VIN = 3.6 V
1000
TPS62235
MODE = GND,
VOUT = 1.2 V,
500
VIN = 5 V
2500
VIN = 3.6 V
TA = 25°C
25
20
TA = -40°C
15
L = 2.2 mH,
COUT = 4.7 mF
0
0
0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
IO - Output Current - A
Figure 27. Switching Frequency vs Output Current, 1.1V Output
Voltage MODE = PFM – TPS622311
Copyright © 2009–2010, Texas Instruments Incorporated
10
2
2.5
3
3.5
4
4.5
5
VIN - Input Voltage - V
5.5
6
Figure 28. Quiescent Current IQ vs Ambient Temperature TA
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
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0.2
0.18
TA = 85°C
ISD - Shutdown Current - mA
0.16
0.14
0.12
0.1
0.08
TA = 60°C
TA = 25°C
TA = -40°C
0.06
0.04
0.02
0
2
2.5
3
3.5
4
4.5
5
VIN - Input Voltage - V
5.5
6
PMOS
1.8
TA = 85°C
TA = 60°C
1.6
1.4
TA = 25°C
1.2
TA = -40°C
1
0.8
0.6
0.4
0.2
0
2
2.5
3
3.5
4
4.5
5
VIN - Input Voltage - V
5.5
6
100
0.7
NMOS
TA = 85°C
0.6
TA = 60°C
0.5
TA = 25°C
TA = -40°C
0.4
0.3
0.2
0.1
IOUT = 50 mA,
MODE = 0,
forced PWM
90
80
70
60
50
40
IOUT = 50 mA,
MODE = 1,
PFM/PWM
IOUT = 150 mA,
PWM Mode
30
VIN = 3.6 V,
VOUT = 1.8 V,
20
CIN = 2.2 mF,
COUT = 4.7 mF,
10
L = 2.2 mH
0
2
2.5
3
3.5
4
4.5
5
VIN - Input Voltage - V
5.5
6
Figure 31. NMOS RDSON vs Supply Voltage VIN and Ambient
Temperature TA
14
2
Figure 30. PMOS RDSON vs Supply Voltage VIN and Ambient
Temperature TA
PSRR - Power Supply Rejection Ratio - dB
rDS(ON) - Static Drain-Source On-State Resistance - W
Figure 29. Shutdown Current ISD vs Ambient Temperature TA
rDS(ON) - Static Drain-Source On-State Resistance - W
TYPICAL CHARACTERISTICS (continued)
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0
10
100
1k
10k
f - Frequency - kHz
100k
1M
Figure 32. TPS62231 1.8V PSRR
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
SW
2 V/div
VIN = 3.6 V
VIN = 3.6V
COUT = 4.7 mF
L = 1 mH
VOUT = 2.5V
20 mV/Div
VOUT = 2.5V
20 mV/div
COUT = 4.7 mF
SW
2 V/div
MODE = GND
IOUT = 10 mA
L = 2.2 mH
MODE = GND
IOUT = 10 mA
IL
200 mA/Div
IL
200 mA/div
t - Time - 1 ms/div
t - Time - 1 ms/div
Figure 33. PFM Mode Operation IOUT = 10mA
Figure 34. PFM Mode Operation IOUT = 10mA
VOUT = 2.5 V
20 mV/div
MODE = VIN
IOUT = 10 mA
VIN = 3.6 V
COUT = 4.7 mF
L = 1 mH
VIN = 3.6 V to 4.2 V
200 mV/div
SW
2 V/div
IL
200 mA/div
VOUT = 1.8 V
20 mV/div
COUT = 4.7 mF
L = 2.2 mH
MODE = GND
IOUT = 50 mA
t - Time - 500 ns/div
t - Time - 10 ms/div
Figure 35. Forced PWM Mode Operation IOUT = 10mA
Figure 36. Line Transient Response PFM Mode
Copyright © 2009–2010, Texas Instruments Incorporated
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
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TYPICAL CHARACTERISTICS (continued)
MODE: 0 V to 3.6 V
2 V/div
PFM Mode Operation
VIN = 3.6 V to 4.2 V
200 mV/div
Forced PWM
Mode Operation
VSW
2 V/div
VIN = 3.6 V,
COUT = 4.7 mF
ICOIL
200 mA/div
L = 1 mH
IOUT = 10 mA
COUT = 4.7 mF
VOUT = 1.8 V
20 mV/div
L = 2.2 mH
MODE = VIN
IOUT = 50 mA
VOUT = 1.8 V
20 mV/div
t - Time - 100 ms/div
t - Time - 1 ms/div
Figure 37. Line Transient Response PWM Mode
Figure 38. Mode Transition PFM / Forced PWM Mode
VIN = 3.6 V
VOUT = 2.5 V
50 mV/div
COUT = 4.7 mF
VOUT = 2.5 V
50 mV/div
L = 2.2 mH
MODE = GND
VIN = 3.6 V
IOUT = 5 mA to 200 mA
sinusoidal
100 mA/div
IL
200 mA/div
IOUT = 5mA to 200mA
sinusoidal
100mA/Div
COUT = 4.7 mF
L = 2.2 mH
MODE = VIN
IL
200 mA/div
t - Time - 5 ms/div
t - Time - 5 ms/div
Figure 39. AC – Load Regulation Performance 2.5V VOUT PFM
Mode
Figure 40. AC – Load Regulation Performance 2.5V VOUT PWM
Mode
16
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
VIN = 3.6 V
COUT = 4.7 mF
VOUT = 1.8 V
50 mV/div
L = 2.2 mH
MODE = GND
VOUT = 2.5 V
50 mV/div
VIN = 3.6 V
IOUT = 5 mA to 150 mA, 50 kHz
sinusoidal 100 mA/div
COUT = 4.7 mF
IOUT = 5 mA to 200 mA
100 mA/div
L = 1 mH
MODE = GND
IL
200 mA/div
IL
200 mA/div
t - Time - 4 ms/div
t - Time - 5 ms/div
Figure 41. AC – Load Regulation Performance 1.8V VOUT PFM
Mode
Figure 42. Load Transient Response 5mA to 200mA PFM to
PWM Mode, VOUT 2.5V
VIN = 3.6 V
VOUT = 2.5 V
50 mV/div
VOUT = 1.8 V
50 mV/div
COUT = 4.7 mF
L = 2.2 mH
MODE = GND
VIN = 3.6 V
IOUT = 5 mA to 200 mA
100 mA/div
COUT = 4.7 mF
L = 1 mH
MODE = VIN
IL
200 mA/div
I OUT = 5 mA to 150 mA
100 mA/div
IL
200 mA/div
t - Time - 5 ms/div
t - Time - 10 ms/div
Figure 43. Load Transient Response 5mA to 200mA, Forced
PWM Mode, VOUT 2.5V
Figure 44. Load Transient Response 5mA to 150mA, PFM to
PWM Mode, VOUT 1.8V
Copyright © 2009–2010, Texas Instruments Incorporated
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
TYPICAL CHARACTERISTICS (continued)
VIN = 3.6 V
EN
2 V/div
COUT = 4.7 mF
VOUT = 1.8 V
50 mV/div
L = 2.2 mH
MODE = VIN
SW
2 V/div
VIN = 3.6 V
VOUT = 0 V to 2.5 V
1 V/div
IOUT = 5 mA to 150 mA
100 mA/div
IL
200 mA/div
COUT = 4.7 mF
L = 1 mH
MODE = GND
Load = 20 R
IIN
50 mA/div
t - Time - 10 ms/div
t - Time - 20 ms/div
Figure 45. Load Transient Response 5mA to 150mA, Forced
PWM Mode, VOUT 1.8V
Figure 46. Start Up into 20Ω Load, VOUT 2.5V
1m
EN 2 V/div
900m
TPS62231
MODE = GND,
VOUT = 1.8 V,
Ref Lvl = 1mV
RBW 30kHz
VBW 30kHz
SWT ´115ms
RLOAD = 12R
800m
VOUT Pre Bias = 1V
VOUT = 1.8 V
1 V/div
700m
Noise
600m
SW 5 V/div
VIN = 3.6 V
COUT = 4.7 mF
L = 2.2 mH
MODE = GND
IOUT = 0 mA
IL
200 mA/div
VIN = 2.7V(green)
L = 2.2 mH,
(MIPSZ2012 2R2, Size 2012)
COUT = 4.7 mF (Size 0402)
500m
400m
VIN = 3V(red)
300m
VIN = 3.6V(blue)
200m
100m
VIN = 4.2V(yellow)
10n
Time Base - 20 ms/div
Figure 47. Startup in 1V Pre-biased Output
18
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Start
0 Hz
4 MHz
f - Frequency
Stop
40 MHz
Figure 48. Spurious Output Noise, 12R Load, TPS62231
Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
TYPICAL CHARACTERISTICS (continued)
1m
900m
800m
TPS62231
MODE = GND,
VOUT = 1.8 V,
Ref Lvl = 1mV
RBW 30kHz
VBW 30kHz
SWT 28ms
RLOAD = 100R
L = 2.2 mH,
(MIPSZ2012 2R2, Size 2012)
COUT = 4.7 mF (Size 0402)
700m
Noise
600m
VIN = 4.2V(yellow)
500m
VIN = 3.6V(blue)
400m
VIN = 3V(red)
300m
200m
VIN = 2.7V(green)
100m
10n
Stop
1 MHz
10 MHz
f - Frequency
Figure 49. Spurious Output Noise, 100R Load, TPS62231
Start
0 Hz
DETAILED DESCRIPTION
The TPS6223X synchronous step down converter family includes a unique hysteretic PWM controller scheme
which enables switch frequencies over 3MHz, excellent transient and AC load regulation as well as operation
with cost competitive external components.
The controller topology supports forced PWM Mode as well as Power Save Mode operation. Power Save Mode
operation reduces the quiescent current consumption down to 22mA and ensures high conversion efficiency at
light loads by skipping switch pulses.
In forced PWM Mode, the device operates on a quasi fixed frequency, avoids pulse skipping, and allows filtering
of the switch noise by external filter components.
The TPS6223X devices offer fixed output voltage options featuring smallest solution size by using only three
external components.
The internal switch current limit of typical 850mA supports output currents of up to 500mA, depending on the
operating condition.
A significant advantage of TPS6223X compared to other hysteretic PWM controller topologies is its excellent DC
and AC load regulation capability in combination with low output voltage ripple over the entire load range which
makes this part well suited for audio and RF applications.
OPERATION
Once the output voltage falls below the threshold of the error comparator, a switch pulse is initiated, and the high
side switch is turned on. It remains turned on until a minimum on time of tONmin expires and the output voltage
trips the threshold of the error comparator or the inductor current reaches the high side switch current limit. Once
the high side switch turns off, the low side switch rectifier is turned on and the inductor current ramps down until
the high side switch turns on again or the inductor current reaches zero.
In forced PWM Mode operation, negative inductor current is allowed to enable continuous conduction mode even
at no load condition.
Copyright © 2009–2010, Texas Instruments Incorporated
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TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
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POWER SAVE MODE
Connecting the MODE pin to GND enables the automatic PWM and power-save mode operation. The converter
operates in quasi fixed frequency PWM mode at moderate to heavy loads and in the PFM (Pulse Frequency
Modulation) mode during light loads, which maintains high efficiency over a wide load current range.
In PFM Mode, the device starts to skip switch pulses and generates only single pulses with an on time of tONmin.
The PFM Mode frequency depends on the load current and the external inductor and output capacitor values.
The PFM Mode of TPS6223X is optimized for low output voltage ripple if small external components are used.
Even at low output currents, the PFM frequency is above the audible noise spectrum and makes this operation
mode suitable for audio applications.
The on time tONmin can be estimated to:
V
t ONmin = OUT ´ 260 ns
VIN
(1)
Therefore, the peak inductor current in PFM mode is approximately:
(V - VOUT )
´ t ONmin
ILPFMpeak = IN
L
(2)
With
tON: High side switch on time [ns]
VIN: Input voltage [V]
VOUT: Output voltage [V]
L : Inductance [mH]
ILPFMpeak : PFM inductor peak current [mA]
FORCED PWM MODE
Pulling the MODE pin high forces the converter to operate in a continuous conduction PWM mode even at light
load currents. The advantage is that the converter operates with a quasi fixed frequency that allows simple
filtering of the switching frequency for noise-sensitive applications. In this mode, the efficiency is lower compared
to the power-save mode during light loads.
For additional flexibility, it is possible to switch from power-save mode to forced PWM mode during operation.
This allows efficient power management by adjusting the operation of the converter to the specific system
requirements.
100% DUTY CYCLE LOW DROPOUT OPERATION
The device starts to enter 100% duty cycle mode once the input voltage comes close to the nominal output
voltage. In order to maintain the output voltage, the High Side switch is turned on 100% for one or more cycles.
With further decreasing VIN the High Side MOSFET switch is turned on completely. In this case the converter
offers a low input-to-output voltage difference. This is particularly useful in battery-powered applications to
achieve longest operation time by taking full advantage of the whole battery voltage range.
The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be
calculated as:
VINmin = VOUT max + IOUT max ´ RDS(on)max+ RL
(
)
(3)
With:
IOUTmax = maximum output current plus inductor ripple current
RDS(on)max = maximum P-channel switch RDSon.
RL = DC resistance of the inductor
VOUTmax = nominal output voltage plus maximum output voltage tolerance
20
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
UNDER VOLTAGE LOCKOUT
The under voltage lockout circuit prevents the device from misoperation at low input voltages. It prevents the
converter from turning on the switch or rectifier MOSFET under undefined conditions. The TPS6223X devices
have a UVLO threshold set to 1.8V (typical). Fully functional operation is permitted for input voltage down to the
falling UVLO threshold level. The converter starts operation again once the input voltage trips the rising UVLO
threshold level.
SOFT START
The TPS6223X has an internal soft-start circuit that controls the ramp up of the output voltage and limits the
inrush current during start-up. This limits input voltage drops when a battery or a high-impedance power source
is connected to the input of the converter.
The soft-start system generates a monotonic ramp up of the output voltage and reaches the nominal output
voltage typically 100ms after EN pin was pulled high.
Should the output voltage not have reached its target value by this time, such as in the case of heavy load, the
converter then operates in a current limit mode set by its switch current limits.
TPS6223X is able to start into a pre-biased output capacitor. The converter starts with the applied bias voltage
and ramps the output voltage to its nominal value.
ENABLE / SHUTDOWN
The device starts operation when EN is set high and starts up with the soft start as previously described. For
proper operation, the EN pin must be terminated and must not be left floating.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1mA. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off.
The EN input can be used to control power sequencing in a system with various DC/DC converters. The EN pin
can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of supply
rails.
SHORT-CIRCUIT PROTECTION
The TPS6223X integrates a High Side and Low Side MOSFET current limit to protect the device against heavy
load or short circuit. The current in the switches is monitored by current limit comparators. When the current in
the P-channel MOSFET reaches its current limit, the P-channel MOSFET is turned off and the N-channel
MOSFET is turned on to ramp down the current in the inductor. The High Side MOSFET switch can only turn on
again, once the current in the Low Side MOSFET switch has decreased below the threshold of its current limit
comparator.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds 150°C (typical) the device goes into thermal shutdown. In this
mode, the High Side and Low Side MOSFETs are turned-off. The device continues its operation when the
junction temperature falls below the thermal shutdown hysteresis.
Copyright © 2009–2010, Texas Instruments Incorporated
Submit Documentation Feedback
21
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
APPLICATION INFORMATION
VIN
L
1/2.2 mH
TPS62230
2.7 V - 6 V
VIN
EN
MODE
CIN
2.2 mF
SW
FB
GND
VOUT
2.5 V
COUT
4.7 mF
Figure 50. TPS62230 2.5V Output
VIN
2.05 V - 6 V
L
1/2.2 mH
TPS62231
SW
FB
VIN
EN
CIN
2.2 mF
MODE
GND
VOUT
1.8 V
COUT
4.7 mF
Figure 51. TPS62231 1.8V Output
VIN
2.05 V - 6 V
L
1/2.2 mH
TPS62232
VIN
EN
CIN
2.2 mF
MODE
SW
FB
GND
VOUT
1.2 V
COUT
4.7 mF
Figure 52. TPS62232 1.2V Output
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS6223X is optimized to operate with effective inductance values in the range of 0.7mH to 4.3mH and with
effective output capacitance in the range of 2.0mF to 15mF. The internal compensation is optimized to operate
with an output filter of L = 1.0mH/2.2mH and COUT = 4.7mF. Larger or smaller inductor/capacitor values can be
used to optimize the performance of the device for specific operation conditions. For more details, see the
CHECKING LOOP STABILITY section.
INDUCTOR SELECTION
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current (ΔIL) decreases with higher inductance and increases with higher VI N or VO UT. Equation 4
calculates the maximum inductor current under static load conditions. The saturation current of the inductor
should be rated higher than the maximum inductor current as calculated with Equation 5. This is recommended
because during heavy load transient the inductor current will rise above the calculated value.
Vout
1Vin
D IL = Vout ´
L ´ ¦
(4)
ILmax = Ioutmax +
DIL
2
(5)
With:
f = Switching Frequency
L = Inductor Value
ΔIL= Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
22
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
In high-frequency converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e.,
quality factor) and to a smaller extent by the inductor DCR value. To achieve high efficiency operation, care
should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing
the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor
size, increased inductance usually results in an inductor with lower saturation current.
The total losses of the coil consist of both the losses in the DC resistance, R(DC), and the following
frequency-dependent components:
• The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
• Additional losses in the conductor from the skin effect (current displacement at high frequencies)
• Magnetic field losses of the neighboring windings (proximity effect)
• Radiation losses
The following inductor series from different suppliers have been used with the TPS6223X converters.
Table 1. List of inductors
INDUCTANCE
[mH]
DIMENSIONS
[mm3]
INDUCTOR TYPE
SUPPLIER
1.0/2.2
2.5 × 2.0 × 1.2
LQM2HPN1R0MJ0
Murata
2.2
2.0 × 1.2 × 0.55
LQM21PN2R2
Murata
1.0/2.2
2.0 × 1.2 × 1.0
MIPSZ2012
FDK
1.0/2.2
2.0 × 2.5 × 1.2
MIPSA2520
FDK
1.0/2.2
2.0 × 1.2 × 1.0
KSLI2012 series
Hitachi Metal
OUTPUT CAPACITOR SELECTION
The unique hysteretic PWM control scheme of the TPS62230 allows the use of tiny ceramic capacitors. Ceramic
capacitors with low ESR values have the lowest output voltage ripple and are recommended. The output
capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors, aside from their wide
variation in capacitance over temperature, become resistive at high frequencies.
At light load currents the converter operate in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value and the PFM peak inductor current. Higher output capacitor values minimize the
voltage ripple in PFM Mode and tighten DC output accuracy in PFM Mode.
INPUT CAPACITOR SELECTION
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. For most applications a 2.2mF to 4.7mF ceramic capacitor is recommended. The input capacitor
can be increased without any limit for better input voltage filtering. Because ceramic capacitor loses up to 80% of
its initial capacitance at 5V, it is recommended to use 4.7mF input capacitors for input voltages > 4.5V.
Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the
power is being supplied through long wires, such as from a wall adapter, a load step at the output or VIN step on
the input can induce ringing at the VIN pin. This ringing can couple to the output and be mistaken as loop
instability or could even damage the part by exceeding the maximum ratings.
Table 2 shows a list of tested input/output capacitors.
Table 2. List of Capacitor
CAPACITANCE [mF]
SIZE
CAPACITOR TYPE
2.2
0402
GRM155R60J225
Murata
4.7
0402
AMK105BJ475MV
Taiyo Yuden
4.7
0402
GRM155R60J475
Murata
4.7
0402
CL05A475MQ5NRNC
Samsung
4.7
0603
GRM188R60J475
Murata
Copyright © 2009–2010, Texas Instruments Incorporated
SUPPLIER
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
SLVS941C – APRIL 2009 – REVISED APRIL 2010
www.ti.com
CHECKING LOOP STABILITY
The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:
• Switching node, SW
• Inductor current, IL
• Output ripple voltage, VOUT(AC)
These are the basic signals that need to be measured when evaluating a switching converter. When the
switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations, the
regulation loop may be unstable. This is often a result of board layout and/or L-C combination.
As a next step in the evaluation of the regulation loop, the load transient response is tested. The time between
the application of the load transient and the turn on of the P-channel MOSFET, the output capacitor must supply
all of the current required by the load. VOUT immediately shifts by an amount equal to ΔI(LOAD) x ESR, where ESR
is the effective series resistance of COUT. ΔI(LOAD) begins to charge or discharge CO generating a feedback error
signal used by the regulator to return VOUT to its steady-state value. The results are most easily interpreted when
the device operates in PWM mode.
During this recovery time, VOUT can be monitored for settling time, overshoot or ringing that helps judge the
converter’s stability. Without any ringing, the loop has usually more than 45° of phase margin.
Because the damping factor of the circuitry is directly related to several resistive parameters (e.g., MOSFET
rDS(on)) that are temperature dependant, the loop stability analysis has to be done over the input voltage range,
load current range, and temperature range.
LAYOUT CONSIDERATIONS
As for all switching power supplies, the layout is an important step in the design. Proper function of the device
demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If
the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well
as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and
short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins
as well as the inductor and output capacitor.
Use a common Power GND node and a different node for the Signal GND to minimize the effects of ground
noise. Keep the common path to the GND PIN, which returns the small signal components and the high current
of the output capacitors as short as possible to avoid ground noise. The FB line should be connected to the
output capacitor and routed away from noisy components and traces (e.g. SW line).
L1
V IN
Total area
is less than
12mm²
C1
C2
GND
V OUT
Figure 53. Recommended PCB Layout for TPS6223X
24
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Copyright © 2009–2010, Texas Instruments Incorporated
TPS62230, TPS62231, TPS62232, TPS62233, TPS62234
TPS62235, TPS62236, TPS62237, TPS62238, TPS62239
TPS622310, TPS622311, TPS622312, TPS622313, TPS622314
www.ti.com
SLVS941C – APRIL 2009 – REVISED APRIL 2010
REVISION HISTORY
Note: Page numbers of current version may differ from previous versions.
Changes from Original (April 2009) to Revision A
•
Page
Added device numbers TPS62233, TPS62234, TPS62238, TPS62239, and TPS622310 to the data sheet ...................... 1
Changes from Revision A (August 2009) to Revision B
Page
•
Added device numbers TPS62235, TPS62236, TPS62237, TPS622311 ............................................................................ 1
•
Changed the Title From: 3 MHz Ultra Small Step Down Converter in 1x1.5 SON Package To: 2 MHz / 3 MHz Ultra
Small Step Down Converter in 1x1.5 SON Package ............................................................................................................ 1
•
Changed Feature: From: 3 MHz switch frequency To: 2 MHz / 3 MHz switch frequency .................................................... 1
•
Added Figure 8 ..................................................................................................................................................................... 8
•
Added Figure 9 ..................................................................................................................................................................... 8
•
Added Figure 10 ................................................................................................................................................................... 8
•
Added Figure 11 ................................................................................................................................................................... 9
•
Added Figure 25 ................................................................................................................................................................. 12
•
Added Figure 26 ................................................................................................................................................................. 12
•
Added Figure 27 ................................................................................................................................................................. 13
•
Added Figure 48 ................................................................................................................................................................. 18
•
Added Figure 49 ................................................................................................................................................................. 18
Changes from Revision B (December 2009) to Revision C
Page
•
Added device numbers TPS622312, TPS622313, and TPS622314 .................................................................................... 1
•
Added ordering information for devices TPS622312, TPS622313, and TPS622314 ........................................................... 2
Copyright © 2009–2010, Texas Instruments Incorporated
Submit Documentation Feedback
25
PACKAGE OPTION ADDENDUM
www.ti.com
22-Apr-2010
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TPS62230DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62230DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622310DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622310DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622311DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622311DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622312DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622312DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622313DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622313DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622314DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS622314DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62231DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62231DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62232DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62232DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62233DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62233DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62234DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62234DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62235DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62235DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62236DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62236DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62237DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
Addendum-Page 1
Lead/Ball Finish
MSL Peak Temp (3)
PACKAGE OPTION ADDENDUM
www.ti.com
22-Apr-2010
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TPS62237DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62238DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62238DRYT
ACTIVE
SON
DRY
6
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62239DRYR
ACTIVE
SON
DRY
6
5000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TPS62239DRYT
ACTIVE
SON
DRY
6
250
CU NIPDAU
Level-1-260C-UNLIM
Green (RoHS &
no Sb/Br)
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
31-Mar-2010
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
TPS62230DRYR
SON
DRY
6
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
5000
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62230DRYT
SON
DRY
6
250
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62231DRYR
SON
DRY
6
5000
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62231DRYT
SON
DRY
6
250
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62232DRYR
SON
DRY
6
5000
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62232DRYT
SON
DRY
6
250
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62233DRYR
SON
DRY
6
5000
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
TPS62233DRYT
SON
DRY
6
250
179.0
8.4
1.2
1.65
0.7
4.0
8.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
31-Mar-2010
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
TPS62230DRYR
SON
DRY
6
5000
220.0
205.0
50.0
TPS62230DRYT
SON
DRY
6
250
220.0
205.0
50.0
TPS62231DRYR
SON
DRY
6
5000
220.0
205.0
50.0
TPS62231DRYT
SON
DRY
6
250
220.0
205.0
50.0
TPS62232DRYR
SON
DRY
6
5000
220.0
205.0
50.0
TPS62232DRYT
SON
DRY
6
250
220.0
205.0
50.0
TPS62233DRYR
SON
DRY
6
5000
220.0
205.0
50.0
TPS62233DRYT
SON
DRY
6
250
220.0
205.0
50.0
Pack Materials-Page 2
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