TI TPS728XX

TPS728xx Series
www.ti.com
SBVS095 – AUGUST 2007
200mA Low-Dropout Linear Regulator
with Pin-Selectable Dual-Voltage Level Output
FEATURES
1
•
•
•
•
2
•
•
•
•
•
Very Low Dropout: 230mV Typical at 200mA
3% Accuracy Over Load/Line/Temperature
Low IQ: 50μA in Active Mode
Available in Fixed-Output Voltages From 0.9V
to 3.6V Using Innovative Factory EEPROM
Programming
VSET Pin Toggles Output Voltage Between
Two Preset Levels
– Preset Output Voltage Levels Can Be
EEPROM-Programmed To Any Combination
High PSRR: 65dB at 1kHz
Stable with a 1.0μF Ceramic Capacitor
Thermal Shutdown and Over-Current
Protection
Available in Wafer-Level Chip Scale and
2mm x 2mm SON Packages
APPLICATIONS
•
•
•
•
•
Power Rails with Programming Mode
Dual Voltage Levels for Power-Saving Mode
Leakage Reduction for 90nm and 65nm
Processors
Wireless Handsets, Smart Phones, PDAs
MP3 Players and Other Handheld Products
DESCRIPTION
The TPS728xx series of low-dropout linear regulators
(LDOs), with a selectable dual-voltage level output, is
designed specially for applications that require two
levels of output voltage regulation. Programming
fuses and memory cards, reducing leakage effects,
and conserving power in nanometric processes are
some application examples.
The VSET pin is used to select one of two output
voltage levels preset through innovative factory
EEPROM programming. A precision bandgap and
error amplifier provides an overall 3% accuracy over
load, line, and temperature extremes.
Ultra-small wafer chip scale (WCSP) and 2mm x
2mm SON packages make the TPS728xx series ideal
for handheld applications.
This family of devices is fully specified over a
temperature range of TJ = –40°C to +125°C.
TPS728xx Series
DRV PACKAGE
2mm x 2mm SON-6
(TOP VIEW)
TPS728xx Series
YZU PACKAGE
WCSP-5
(TOP VIEW)
C3
C1
IN
OUT
OUT 1
B2
GND
VSET 2
A3
VSET
(1)
6 IN
Thermal
A1
EN
Pad(1)
NC 3
5 GND
4 EN
It is recommended that the SON package
thermal pad be connected to ground.
1
2
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.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
www.ti.com
SBVS095 – AUGUST 2007
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION (1)
VOUT (2)
PRODUCT
TPS728vvvxxxyyyz
(1)
(2)
VVV is the nominal output voltage for VOUT1 and corresponds to VSET = Low.
XXX is the nominal output voltage for VOUT2 and corresponds to VSET = High.
YYY is package designator.
Z is Tape and reel quantity (R = 3000, T = 250).
For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
Output voltages from 0.9V to 3.6V in 50mV increments are available through the use of innovative factory EEPROM programming;
minimum order quantities may apply. Contact factory for details and availability.
ABSOLUTE MAXIMUM RATINGS (1)
At TJ = –40°C to +125°C (unless otherwise noted). All voltages are with respect to GND.
PARAMETER
Input voltage range, VIN
Enable and VSET voltage range, VEN and VSET
Output voltage range, VOUT
TPS728xx Series
UNIT
–0.3 to +7.0
V
–0.3 to VIN + 0.3 (2)
V
–0.3 to +7.0
V
Maximum output current, IOUT
Internally limited
Output short-circuit duration
Indefinite
Total continuous power dissipation, PDISS
See Dissipation Ratings Table
Human body model (HBM)
ESD rating
2
kV
500
V
Operating junction temperature range, TJ
–55 to +150
°C
Storage temperature range, TSTG
–55 to +150
°C
(1)
(2)
Charged device model (CDM)
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
VEN and VSET absolute maximum rating is VIN + 0.3V or +7.0V, whichever is less.
DISSIPATION RATINGS
BOARD
DERATING FACTOR
ABOVE TA = +25°C
TA < +25°C
TA = +70°C
TA = +85°C
20°C/W
65°C/W
15.4mW/°C
1540mW
845mW
615mW
85°C/W
268°C/W
3.7mW/°C
370mW
205mW
150mW
RθJC
(1)
DRV
High-K (1)
YZU
High-K
(1)
2
RθJA
PACKAGE
The JEDEC high-K (2s2p) board used to derive this data was a 3- × 3-inch, multilayer board with 1-ounce internal power and ground
planes and 2-ounce copper traces on top and bottom of the board.
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TPS728xx Series
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SBVS095 – AUGUST 2007
ELECTRICAL CHARACTERISTICS
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VSET = VEN = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
PARAMETER
VIN
TEST CONDITIONS
Input voltage range
Nominal
VOUT (1)
DC output accuracy
ΔVOUT
Load transient
VO
ΔVO/ΔVIN
Over VIN, IOUT, VOUT + 0.5V ≤ VIN ≤ 6.5V,
temperature
0mA ≤ IOUT ≤ 200mA, VSET = high/low
Output voltage range
VDO
Dropout voltage
ICL
Output current limit
ISHDN
PSRR
(1)
(2)
(3)
(4)
(5)
–3.0
+3.0
%
±60.0
Ground pin current
240
IOUT = 0mA
μV/V
75
μV/mA
230
400
mV
340
575
mA
50
80
μA
120
Shutdown current (IGND)
0.10
Power-supply rejection ratio
VIN = 3.8V,
VOUT = 2.8V,
IOUT = 200mA
f = 1kHz
65
dB
f = 10kHz
55
dB
f = 100kHz
40
dB
VOUT_LOW = 1.8V, VOUT_HIGH = 3.15V,
IOUT = 10mA
tSTR
Startup time (3)
COUT = 1.0μF
tSHUT
Shutdown time (4)
RL = ∞, COUT = 1.0μF, VOUT = 2.8V
Enable and select pin currents
EN = VSET = 6.5V
Undervoltage lockout
VIN rising, VSET = high/low
Hysteresis
VIN falling, VSET = high/low
TSD
Thermal shutdown temperature
TJ
Operating junction temperature
μA
dB
Transition time (low-to-high)
VOUT = VOUT_LOW to VOUT_HIGH
VOUT = 97% × VOUT_HIGH
VSET low (output VOUT1 selected),
or enable pin low (disabled)
1.0
65
tTR
VLO
μA
f = 100Hz
BW = 100Hz to 100kHz, VIN = 3.3V,
VOUT = 2.8V, IOUT = 10mA
VSET high (output VOUT2 selected),
or enable pin high (enabled)
V
130
VEN ≤ 0.4V, 2.7V ≤ VIN < 4.5V,
TJ = –40°C to +85°C
VHI
mV
3.6
IOUT = 200mA
Output noise voltage
UVLO
mV
VIN = VOUT(NOM) – 0.1V, IOUT = 200mA
VN
IEN, IVSET
V
+2.5
0.9
VOUT = 0.9 × VOUT(NOM)
UNIT
–2.5
0mA ≤ IOUT ≤ 200mA
(2)
MAX
6.5
VOUT(NOM) + 0.5V ≤ VIN ≤ 6.5V,
IOUT = 5mA
Line regulation
TYP
2.7
100μA to 200mA in 1μs,
200mA to 100μA in 1μs, COUT = 1μF
ΔVO/ΔIOUT Load regulation
IGND
TJ = +25°C, VSET = high/low
MIN
75 × VOUT
μVRMS
60
μs
160
μs
180 (5)
μs
1.2
VIN
V
0
0.4
V
0.04
1.0
μA
2.51
2.65
2.38
V
230
mV
Shutdown, temperature increasing
+160
°C
Reset, temperature decreasing
+140
–40
°C
+125
°C
The output voltage for VSET = low/high is programmed at the factory.
VDO is not measured for devices with VOUT(NOM) < 2.8V because minimum VIN = 2.7V.
Time from VEN = 1.2V to VOUT = 97% (VOUT(NOM)).
Time from VEN = 0.4V to VOUT = 5% (VOUT(NOM)).
See Shutdown in the Application Information section for more details.
Copyright © 2007, Texas Instruments Incorporated
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DEVICE INFORMATION
IN
OUT
Current
Limit
Thermal
Shutdown
EEPROM
EN
Bandgap
MUX
UVLO
Active
PullDown
VSET
60W
LOGIC
Figure 1. Functional Block Diagram
4
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Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
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SBVS095 – AUGUST 2007
YZU PACKAGE
WCSP-5
(TOP VIEW)
C1
C3
IN
OUT
B2
GND
A3
A1
EN
VSET
DRV PACKAGE
SON-8
(TOP VIEW)
OUT 1
6 IN
Thermal
VSET 2
NC 3
(1)
Pad(1)
5 GND
4 EN
It is recommended that the SON package thermal pad be connected to ground.
PIN DESCRIPTIONS
TPS728xx Series
NAME
DRV
YZU
DESCRIPTION
OUT
1
C1
Regulated output voltage pin. A small 1μF ceramic capacitor is needed from this pin to ground to assure
stability. See Input and Output Capacitor Requirements in the Application Information section for more
details.
VSET
2
A3
Select pin. Driving VSET below 0.4V selects preset output voltage VOUT1. Driving VSET over 1.2V selects
preset output voltage VOUT2.
NC
3
—
No connection.
EN
4
A1
Enable pin. Driving EN over 1.2V turns on the regulator. Driving EN below 0.4V puts the regulator into
shutdown mode, thus reducing the operating current to 100nA, nominal.
GND
5
B2
Ground pin (connect DRV thermal pad to ground)
IN
6
C3
Input pin. A small capacitor is needed from this pin to ground to assure stability. See Input and Output
Capacitor Requirements in the Application Information section for more details.
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TYPICAL CHARACTERISTICS
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
LINE REGULATION
IOUT = 5mA, VOUT = 0.9V (nom)
LINE REGULATION
IOUT = 200mA, VOUT = 0.9V (nom)
5
10
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
4
3
6
4
DVOUT (mV)
DVOUT (mV)
2
1
0
-1
2
0
-2
-2
-4
-3
-6
-4
-8
-5
-10
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
8
6.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
VIN (V)
Figure 2.
Figure 3.
LINE REGULATION
IOUT = 5mA, VOUT = 1.85V (nom)
LINE REGULATION
IOUT = 200mA, VOUT = 1.85V (nom)
6
6.0
6.5
6.0
6.5
6.0
6.5
6
3
3
0
DVOUT (mV)
DVOUT (mV)
0
-3
-6
-12
-9
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
-15
-18
-15
-21
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
VIN (V)
Figure 4.
Figure 5.
LINE REGULATION
IOUT = 5mA, VOUT = 3.6V (nom)
LINE REGULATION
IOUT = 200mA, VOUT = 3.6V (nom)
5
10
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
5
0
DVOUT (mV)
0
DVOUT (mV)
-6
-2
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
-9
-3
-5
-10
-5
-10
-15
-20
-15
-25
-20
-30
2.5
6
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
2.5
3.0
3.5
4.0
4.5
VIN (V)
VIN (V)
Figure 6.
Figure 7.
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5.0
5.5
Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
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SBVS095 – AUGUST 2007
TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
LOAD REGULATION UNDER LIGHT LOADS
VOUT = 0.9V (nom)
LOAD REGULATION
VOUT = 0.9V (nom)
15
10
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
0
DVOUT (mV)
DVOUT (mV)
10
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
5
5
-5
-10
-15
0
-20
-5
-25
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
60
80
100
120 140
Figure 8.
Figure 9.
LOAD REGULATION UNDER LIGHT LOADS
VOUT = 1.85V (nom)
LOAD REGULATION
VOUT = 1.85V (nom)
160 180
200
10
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
6
4
2
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
5
0
DVOUT (mV)
DVOUT (mV)
40
IOUT (mA)
8
0
-2
-5
-10
-15
-4
-20
-6
-25
-8
-30
-10
-35
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
20
40
60
80
100
120 140
IOUT (mA)
IOUT (mA)
Figure 10.
Figure 11.
LOAD REGULATION UNDER LIGHT LOADS
VOUT = 3.6V (nom)
LOAD REGULATION
VOUT = 3.6V (nom)
25
160 180
200
25
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
20
15
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
20
15
10
DVOUT (mV)
10
DVOUT (mV)
20
IOUT (mA)
5
0
-5
5
0
-5
-10
-10
-15
-15
-20
-20
-25
-25
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
20
40
60
80
100
120 140
IOUT (mA)
IOUT (mA)
Figure 12.
Figure 13.
Copyright © 2007, Texas Instruments Incorporated
160 180
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TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
DROPOUT VOLTAGE
vs OUTPUT CURRENT
OUTPUT VOLTAGE
vs TEMPERATURE
300
3
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
250
2
1
DVOUT (%)
VDO (mV)
200
VOUT = 0.9V
150
100
IOUT = 0.1mA
0
IOUT = 5mA
-1
IOUT = 200mA
50
-2
VOUT = 3.6V (nom)
VIN = VOUT - 0.1V
0
0
20
40
60
80
100
120 140
160 180
-3
200
-40 -25 -10
5
20
IOUT (mA)
35
50
65
80
95
110 125
TJ (°C)
Figure 14.
Figure 15.
OUTPUT VOLTAGE
vs TEMPERATURE
GROUND PIN CURRENT
vs INPUT VOLTAGE
2.0
50
IOUT = 0mA
VOUT = 3.6V
1.5
45
IOUT = 0.1mA
0.5
IGND (mA)
DVOUT (%)
1.0
0
IOUT = 5mA
-0.5
40
35
IOUT = 200mA
-1.0
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
30
-1.5
25
-2.0
-40 -25 -10
5
20
35
50
65
80
95
110 125
2.5
4.0
4.5
5.0
5.5
Figure 16.
Figure 17.
GROUND PIN CURRENT
vs OUTPUT CURRENT
GROUND PIN CURRENT
vs TEMPERATURE
6.0
6.5
60
IOUT = 0mA
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
130
55
50
IGND (mA)
110
IGND (mA)
3.5
VIN (V)
150
90
45
70
40
50
35
30
30
0
20
40
60
80
100
120 140
IOUT (mA)
Figure 18.
8
3.0
TJ (°C)
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160 180
200
-40 -25 -10
5
20
35
50
65
80
95
110 125
TJ (°C)
Figure 19.
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TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
SHUTDOWN CURRENT
vs INPUT VOLTAGE
CURRENT LIMIT
vs INPUT VOLTAGE
350
1600
1200
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
340
Current Limit (mA)
1400
ISHDN (nA)
VOUT = 0.9V (nom)
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
1000
800
600
330
320
310
300
290
400
280
200
IOUT = 0mA
270
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2.5
6.5
3.5
4.0
5.0
5.5
6.0
6.5
Figure 20.
Figure 21.
CURRENT LIMIT
vs INPUT VOLTAGE
TPS728185315 POWER-SUPPLY RIPPLE REJECTION
vs FREQUENCY (VIN – VOUT = 0.85V)
90
VOUT = 3.6V (nom)
TJ = -40°C
TJ = +25°C
TJ = +85°C
TJ = +125°C
340
330
5mA
VIN = 2.7V
VOUT = 1.85V
COUT = 1mF
80
70
PSRR (dB)
320
310
300
60
50
200mA
40
100mA
30
290
20
280
10
270
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
10
100
1k
VIN (V)
10k
100k
1M
10M
Frequency (Hz)
Figure 22.
Figure 23.
TPS728185315 POWER-SUPPLY RIPPLE REJECTION
vs FREQUENCY (VIN – VOUT = 1.0V)
TPS728185315 POWER-SUPPLY RIPPLE REJECTION
vs FREQUENCY (VIN – VOUT = 0.5V)
90
90
5mA
VIN = 2.85V
VOUT = 1.85V
COUT = 1mF
80
70
60
50
200mA
40
100mA
5mA
70
60
50
40
200mA
30
30
20
20
10
10
0
VIN = 3.65V
VOUT = 3.15V
COUT = 1mF
80
PSRR (dB)
PSRR (dB)
4.5
VIN (V)
350
Current Limit (mA)
3.0
VIN (V)
100mA
0
10
100
1k
10k
100k
Frequency (Hz)
Figure 24.
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1M
10M
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Figure 25.
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TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
90
VIN = 4.15V
VOUT = 3.15V
COUT = 1mF
5mA
80
PSRR (dB)
70
60
50
200mA
40
100mA
30
20
10
OUTPUT SPECTRAL NOISE DENSITY
vs FREQUENCY
Output spectal Noise Density (mV/ÖHz)
TPS728185315 POWER-SUPPLY RIPPLE REJECTION
vs FREQUENCY (VIN – VOUT = 1.0V)
10
1
0.1
Load IOUT = 185mA
CIN = COUT = 1mF
VOUT = 1.85V
Noise = 141.6mVRMS
0.01
0
10
100
1k
10k
100k
1M
10M
10
100
1k
Output spectal Noise Density (mV/ÖHz)
10k
100k
Frequency (Hz)
Frequency (Hz)
Figure 26.
Figure 27.
OUTPUT SPECTRAL NOISE DENSITY
vs FREQUENCY
LINE TRANSIENT RESPONSE
10
VIN = 2.7V to 6.5V, Slew Rate = 1V/ms
VOUT = 1.85V, IOUT = 200mA
VOUT
10mV/div
1
VIN
0.1
Load IOUT = 200mA
CIN = COUT = 1mF
VOUT = 3.15V
Noise = 217mVRMS
0.01
10
100
1k
10k
Time (100ms/div)
100k
Frequency (Hz)
Figure 28.
Figure 29.
LINE TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE
VIN
10mV/div
VOUT
10mV/div
200mA
VOUT
VIN = 3.8V to 6.5V, Slew Rate = 1V/ms
VOUT = 3.3V, IOUT = 200mA
Time (100ms/div)
Figure 30.
10
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VIN = 2.7V
VOUT = 1.85V
IOUT = 5mA to 200mA
tR = tF = 1ms
IOUT
5mA
Time (10ms/div)
Figure 31.
Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
www.ti.com
SBVS095 – AUGUST 2007
TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
LOAD TRANSIENT RESPONSE
ENABLE TRANSIENT RESPONSE
VOUT
10mV/div
EN
VOUT
200mA
VIN = 3.8V, VOUT = 3.3V, IOUT = 0mA
Enable = 0.4V to 1V to 0.4V
VIN = 3.8V
VOUT = 3.3V
IOUT = 5mA to 200mA
tR = tF = 1ms
IOUT
5mA
200mV/div
500mV/div
Time (10ms/div)
Time (100ms/div)
Figure 32.
Figure 33.
VIN RAMP UP AND RAMP DOWN RESPONSE
VSET PIN TOGGLE
VOUT
1V/div
200mV/div
VIN
VSET
VOUT Transition Time < 40ms (2% settling)
VOUT
VOUT Transitioning from 1.85V to 3.15V
IOUT = 1mA
Time (10ms/div)
Time (2ms/div)
Figure 34.
Figure 35.
VSET PIN TOGGLE
VSET PIN TOGGLE
VOUT Transitioning from 3.15V to 1.85V
IOUT = 1mA
VOUT
VOUT
200mV/div
200mV/div
VSET
VOUT Transition Time < 40ms (2% settling)
VOUT Transitioning from 1.85V to 3.15V
IOUT = 10mA
VSET
Time (100ms/div)
Time (40ms/div)
Figure 36.
Figure 37.
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TPS728xx Series
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SBVS095 – AUGUST 2007
TYPICAL CHARACTERISTICS (continued)
Over operating temperature range (TJ = –40°C to +125°C), VIN = VOUT(TYP) + 0.5V or 2.7V, whichever is greater;
IOUT = 0.5mA, VEN = VSET = VIN, COUT = 1.0μF, unless otherwise noted. Typical values are at TJ = +25°C.
VSET PIN TOGGLE
VOUT Transitioning from 3.15V to 1.85V
IOUT = 10mA
200mV/div
VOUT
VSET
Time (20ms/div)
Figure 38.
12
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Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
www.ti.com
SBVS095 – AUGUST 2007
APPLICATION INFORMATION
The TPS728xx series belongs to a family of new
generation LDO regulators that use innovative
circuitry to achieve ultra-wide bandwidth and high
loop gain, resulting in extremely high PSRR (up to
1MHz) at very low headroom (VIN – VOUT). These
features, combined with low noise, low ground pin
current, and ultra-small packaging, make this device
ideal for portable applications. This family of
regulators offers sub-bandgap output voltages,
current limit and thermal protection, and is fully
specified from –40°C to +125°C.
Figure 39 shows the basic circuit connections.
2.7V to 6.5V
VIN
0.9V to 3.6V
IN
VOUT
OUT
1m F
1m F
TPS728xx
On
Off
EN
On (VOUT2)
Off (VOUT1)
Another area where the TPS728xx can be used
effectively is in dynamic voltage scaling (DVS)
applications. In DVS applications, it is required to
dynamically switch between a high operational
voltage to a low standby voltage in order to balance
performance of processors and achieve power
savings. Modern multimillion gate microprocessors
fabricated with the latest sub-micron processes save
on power by transitioning to a lower voltage to reduce
leakage currents without losing content. This
architecture enables the microprocessor to transition
quickly into an operational state (wake up) without
requiring reloading of the states from external
memory, or a reboot.
VSET
GND
Figure 39. Typical Application Circuit
APPLICATION EXAMPLES
EEPROM-based
applications
require
the
programming voltage to be higher than the operating
voltage. The TPS728xx suits such applications where
the maximum programming voltage of the EEPROM
is higher than the operating voltage. The VSET logic
pin allows the application to transition between the
higher EEPROM programming voltage and the lower
operating voltage. For example, the TPS728xx
typically takes less than 40μs to transition from a
lower voltage of 1.85V to a higher voltage of 3.15V
under an output load of 1mA to 10mA, as shown in
Figure 35 and Figure 37, respectively. The special
circuitry in the TPS728xx helps transition from the
higher voltage to the lower voltage under no load.
The load on the output at the end of the programming
cycle is typically under 10mA. Output voltage
overshoots and undershoots are minimal under this
load condition. The TPS728xx typically takes less
than 1ms of transition time going from 3.15V to
1.85V, as shown in Figure 36 and Figure 38,
respectively. Both output states of the TPS728xx are
programmable between 0.9V to 3.6V.
Copyright © 2007, Texas Instruments Incorporated
INPUT AND OUTPUT CAPACITOR
REQUIREMENTS
Although an input capacitor is not required for
stability, it is good analog design practice to connect
a 0.1μF to 1.0μF low equivalent series resistance
(ESR) capacitor across the input supply near the
regulator. This capacitor counteracts reactive input
sources and improves transient response, noise
rejection, and ripple rejection. A higher-value
capacitor may be necessary if large, fast rise-time
load transients are anticipated, or if the device is not
located near the power source. If source impedance
is not sufficiently low, a 0.1μF input capacitor may be
necessary to ensure stability.
The TPS728xx is designed to be stable with standard
ceramic capacitors with values of 1.0μF or larger at
the output. X5R- and X7R-type capacitors are best
because they have minimal variation in value and
ESR over temperature. Maximum ESR should be less
than 1.0Ω.
BOARD LAYOUT RECOMMENDATIONS TO
IMPROVE PSRR AND NOISE PERFORMANCE
To improve ac performance such as PSRR, output
noise, and transient response, it is recommended that
the board be designed with separate ground planes
for VIN and VOUT, with each ground plane connected
only at the GND pin of the device. In addition, the
ground connection for the output capacitor should
connect directly to the GND pin of the device. High
ESR capacitors may degrade PSRR.
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TPS728xx Series
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INTERNAL CURRENT LIMIT
The TPS728xx internal current limits help protect the
regulator during fault conditions. During current limit,
the output sources a fixed amount of current that is
largely independent of output voltage. For reliable
operation, the device should not be operated in a
current limit state for extended periods of time.
The PMOS pass element in the TPS728xx has a
built-in body diode that conducts current when the
voltage at OUT exceeds the voltage at IN. This
current is not limited, so if extended reverse voltage
operation is anticipated, external limiting to 5% of
rated output current may be appropriate.
2.7V to 6.5V
0.9V to 3.6V
VIN
IN
VOUT
OUT
1mF
1mF
2kW
TPS728xx
EN
VSET2
VSET
VSET1
GND
Figure 40. Circuit Showing EN Tied High when
Shutdown Capability is Not Required
SHUTDOWN
The enable pin (EN) is active high and is compatible
with standard and low voltage, TTL-CMOS levels.
When shutdown capability is not required, EN can be
connected to the IN pin, as shown in Figure 40.
Figure 41 shows when both EN and VSET are tied to
IN. The TPS728xx, with internal active output
pulldown circuitry, discharges the output to within 5%
of VOUT with a time (t) of:
t=3
60 ´ RL
60 + RL
2.7V to 6.5V
0.9V to 3.6V
VIN
IN
VOUT
OUT
1mF
1mF
2kW
TPS728xx
EN
VSET
´ COUT
Where:
RL = output load resistance
COUT = output capacitance
GND
Figure 41. Circuit to Tie Both EN and VSET High
DROPOUT VOLTAGE
UNDERVOLTAGE LOCK-OUT (UVLO)
The TPS728xx uses a PMOS pass transistor to
achieve low dropout. When (VIN – VOUT) is less than
the dropout voltage (VDO), the PMOS pass device is
in the linear region of operation and the
input-to-output resistance is the RDS(ON) of the PMOS
pass element. VDO approximately scales with output
current because the PMOS device behaves like a
resistor in dropout.
The TPS728xx uses an undervoltage lock-out circuit
to keep the output shut off until the internal circuitry is
operating properly. The UVLO circuit has a deglitch
feature so that it typically ignores undershoot
transients on the input if they are less than 5μs
duration. The UVLO circuit triggers at approximately
2.3V on an undershooting or a falling input voltage.
On the TPS728xx, the active pulldown discharges
VOUT when the device is in UVLO off condition.
However, the input voltage must be greater than 0.8V
for the active pulldown to work.
As with any linear regulator, PSRR and transient
response are degraded as (VIN – VOUT) approaches
dropout. This effect is shown in Figure 25 and
Figure 26 in the Typical Characteristics section.
TRANSIENT RESPONSE
As with any regulator, increasing the size of the
output capacitor reduces over/undershoot magnitude
but increases duration of the transient response.
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MINIMUM LOAD
The TPS728xx is stable with no output load.
Traditional PMOS LDO regulators suffer from lower
loop gain at very light output loads. The TPS728xx
employs an innovative, low-current mode circuit
under very light or no-load conditions, resulting in
improved output voltage regulation performance
down to zero output current.
Copyright © 2007, Texas Instruments Incorporated
TPS728xx Series
www.ti.com
SBVS095 – AUGUST 2007
THERMAL INFORMATION
Thermal Protection
Thermal protection disables the output when the
junction temperature rises to approximately +160°C,
allowing the device to cool. When the junction
temperature cools to approximately +140°C the
output circuitry is again enabled. Depending on power
dissipation, thermal resistance, and ambient
temperature, the thermal protection circuit may cycle
on and off. This cycling limits the dissipation of the
regulator, protecting it from damage as a result of
overheating.
Any tendency to activate the thermal protection circuit
indicates excessive power dissipation or an
inadequate heatsink. For reliable operation, junction
temperature should be limited to +125°C maximum.
To estimate the margin of safety in a complete design
(including
heatsink),
increase
the
ambient
temperature until the thermal protection is triggered;
use worst-case loads and signal conditions. For good
reliability, thermal protection should trigger at least
+35°C above the maximum expected ambient
condition of your particular application. This
configuration produces a worst-case junction
temperature of +125°C at the highest expected
ambient temperature and worst-case load.
The internal protection circuitry of the TPS728xx has
been designed to protect against overload conditions.
It was not intended to replace proper heatsinking.
Continuously running the TPS728xx into thermal
shutdown degrades device reliability.
Power Dissipation
The ability to remove heat from the die is different for
each
package
type,
presenting
different
considerations in the printed circuit board (PCB)
layout. The PCB area around the device that is free
of other components moves the heat from the device
to the ambient air. Performance data for JEDEC lowand high-K boards are given in the Dissipation
Ratings table. Using heavier copper increases the
effectiveness in removing heat from the device. The
addition of plated through-holes to heat-dissipating
layers also improves the heatsink effectiveness.
Power dissipation depends on input voltage and load
conditions. Power dissipation (PD) is equal to the
product of the output current times the voltage drop
across the output pass element (VIN to VOUT), as
shown in Equation 1:
PD = (VIN - VOUT) ´ IOUT
(1)
Package Mounting
Solder pad footprint recommendations for the
TPS728xx are available from the Texas Instruments
web site at www.ti.com.
1,025
0,975
1,395
1,345
NOTES:
1. All linear dimensions are in millimeters.
2. This drawing is subject to change without notice.
Figure 42. YZU Wafer Chip-Scale Package Dimensions (in mm)
Copyright © 2007, Texas Instruments Incorporated
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