DIODES AP7168

AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Description
Features
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Wide input voltage range: 2.2V – 5.5V
230mV very low dropout at 500mA load
500mV very low dropout at 1A load
Very low quiescent current (IQ): 125µA typical
Adjustable output voltage range: 0.8V to 5.0V
Very fast transient response
High PSRR
Accurate voltage regulation
Current limiting and short circuit protection
Thermal shutdown protection
Stable with any type output capacitor ≥ 4.7µF
Ambient temperature range -40ºC to 85°C
SOP-8L-EP: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
The AP7168 is a 1.2A, adjustable output voltage, ultra-low
dropout linear regulator. The device includes pass element, error
amplifier, band-gap reference, current limit and thermal shutdown
circuitry. The device is turned on when EN pin is set to logic high
level. A Power-OK (POK) output is available for power sequence
control.
The characteristics of the low dropout voltage and low quiescent
current make it suitable for low to medium power applications, for
example, laptop computers, audio and video applications, and
battery powered devices. The typical quiescent current is
approximately 125µA.
Built-in current-limit and thermal-shutdown functions prevent
IC from damage in fault conditions. The AP7168 is available in
SOP-8L-EP package.
Applications
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Servers and laptops
Smart phone and PDA
MP3/MP4
Bluetooth headset
Low and medium power applications
FPGA and DSP core or I/O power
Typical Application Circuit
VIN
VOUT
IN
OUT
100kOhm
R1
AP7168
1µF
10µF
FB
POK
R2
Enable
EN
GND
⎛
R ⎞
VOUT = VREF ⎜⎜1 + 1 ⎟⎟
⎝ R2 ⎠
AP7168 Rev. 1
1 of 11
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© Diodes Incorporated
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Ordering Information
AP7168 - SP G - 13
Device
Green
Packing
SP : SOP-8L-EP
G : Green
13 : Tape & Reel
Package
Code
SP
AP7168-SPG-13
Notes:
Package
Packaging
(Note 2)
SOP-8L-EP
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
(1) SOP-8L-EP
( Top View )
IN
1
8
OUT
POK
2
7
FB
NC
3
6
NC
EN
4
5
GND
Pin Descriptions
Name
Pin Number
IN
1
POK
EN
GND
FB
2
4
5
7
OUT
8
NC
3, 6
AP7168 Rev. 1
Description
Voltage input pins, to be tied together externally. Bypass to ground through at
least 1µF capacitor.
Power-OK output, active-high open-drain.
Enable input, active high.
Ground.
Output feedback.
Voltage output pins, to be tied together externally. Bypass to ground through at
least 4.7µF ceramic capacitor.
No connection.
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Functional Block Diagram
OUT
IN
Current Limit
and Thermal
Shutdown
Gate
Driver
EN
FB
0.8V
POK
0.744V
GND
Absolute Maximum Ratings
Symbol
Parameter
ESD HBM
Human Body Model ESD Protection
ESD MM
Machine Model ESD Protection
VIN
Input Voltage
OUT, FB, POK, EN Voltage
Continuous Load Current
Notes:
Ratings
Unit
4
300
KV
7
V
VIN + 0.3
V
V
Internal Limited
TJ
Operating Junction Temperature Range
-40 ~ 150
°C
TST
Storage Temperature Range
-65 ~150
°C
PD
Power Dissipation
1.9
W
SOP-8L-EP (Note 3, 5)
3. Ratings apply to ambient temperature at 25°C
Recommended Operating Conditions
Symbol
VIN
IOUT
TA
AP7168 Rev. 1
Parameter
Input voltage
Output Current
Operating Ambient Temperature
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Min
2.2
0
-40
Max
5.5
1.2
85
Unit
V
A
°C
NOVEMBER 2009
© Diodes Incorporated
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Electrical Characteristics
o
(TA = 25 C, VIN = VOUT +1V, CIN = 1µF, COUT = 10µF, VEN = VIN, unless otherwise stated)
Symbol
IQ
ISHDN
VDropout
VREF
IFB
VOUT
Parameter
Input Quiescent Current
Input Shutdown Current
Test Conditions
IOUT= 0
VEN = 0V, IOUT = 0 (Note 4)
VOUT ≥ 1.5V, IOUT = 0.5A
VOUT ≥ 1.5V, IOUT = 1A
Dropout Voltage
FB reference voltage
FB leakage
Output Voltage Total Accuracy
ΔVOUT
/ VOUT Line Regulation
ΔVIN
ΔVOUT / VOUT
tST
Load Regulation
Start-up Time, from EN high to
POK high
Power Supply Rejection Ratio
ILIMIT
ISHORT
VIL
VIH
IEN
VOL
Current limit
Short-circuit Current
EN Input Logic Low Voltage
EN Input Logic High Voltage
EN Input leakage
POK output low voltage
Output voltage (rising) POK
threshold
Output voltage POK hysteresis
VPOK_Hys
POK deglitch
POK leakage current
IPOK_LK
Thermal shutdown threshold
TSHDN
Thermal shutdown hysteresis
THYS
Thermal Resistance
θJA
Junction-to-Ambient
Notes:
⎯
-3
VIN = VOUT +1V to 5.5V,
IOUT = 1mA
PSRR
VPOK_TH_UP
Min
⎯
-1
IOUT from 1mA to 1A
VEN = 0V to 2.0V, IOUT =
100mA, VIN = 3.3V
1kHz, VIN = 3.3V, VOUT =
1.2V, IOUT = 100mA
VOUT = 1.8V, ROUT = 0.5Ω
VIN = 3.3V, VOUT < 0.2V
Typ.
125
0.1
230
500
0.8
0.01
Max
180
1
800
1
3
0.02
-1.5
1.2
Unit
µA
µA
mV
mV
V
µA
%
%/V
1.5
%
190
µs
60
dB
1.6
750
0.01
100
1
200
A
mA
V
V
µA
mV
87%
92%
97%
Vref
⎯
4%
160
0.01
145
25
1
Vref
µs
µA
°C
°C
0.4
VEN = 0V or 5.5V
Force 2mA
FB (or OUT for fixed
version) rising
VIN = 3.3V, VOUT = 1.2V
VPOK = 5.5V
SOP-8L-EP (Note 5)
1.4
⎯
74
o
C/W
4. POK pin must be disconnected from IN pin.
5. Test condition for SOP-8L-EP: Device mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with thermal vias,
double sided FR-4 PCB.
AP7168 Rev. 1
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
Output Voltage vs. Temperature
Output Voltage vs. Tem perature
3.40
1.30
VOUT = 1.2V
Output Voltage (V)
Output Voltage (V)
VOUT = 3.3V
3.35
3.30
3.25
1.25
1.20
1.15
1.10
3.20
-50
-25
0
25
50
75
100
-50
125
-25
0
Temperature ( C)
Quiescent Current vs. Input Voltage
140
125
110
95
Iout=0mA
Iout=500mA
Quiescent Current ( μ A)
Quiescent Current (μA)
155
80
75
100
125
VOUT=1.8V
170
160
150
140
130
120
110
VIN=2.5V
VIN=3.3V
100
4.0
4.3
4.6
4.9
5.2
5.5
0.0
0.2
0.4
0.6
Input Voltage (V)
0.8
1.0
1.2
IOUT (A)
Reference Voltage vs. Temperature
Quiescent Current vs. Tem perature
0.810
155
140
125
110
VIN=2.2V, Vout=1.0V
95
VIN=3.3V, Vout=1.8V
Reference Voltage (V)
170
Quiescent Current ( π A)
50
Quiescent Current vs. IOUT
VOUT=3.3V
170
25
Tem perature (0C)
0
0.805
0.800
0.795
Vin=2.2V
Vin=3.3V
Vin=5.5V
VIN=5.0V, Vout=3.3V
0.790
80
-50.0
-25.0
0.0
25.0
50.0
75.0
100.0
125.0
Tem perature ( C)
AP7168 Rev. 1
-50
-25
0
25
50
75
100
125
Temperature (0C)
0
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
(Continued)
Line Regulation
Load Regulation
VOUT=1.8V, IOUT=1mA
VIN=2.2V, VOUT=1.2V,
0.10
0.5
Change in V OUT (%)
Change in V OUT (%/V)
25°C
0.05
0.00
-0.05
25°C
85°C
0.4
85°C
0.3
-40°C
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-40°C
-0.10
-0.5
3.0
3.5
4.0
4.5
5.0
0.0
5.5
0.4
0.8
V IN (V)
Short Circuit Current vs. Temperature
Short Circuit Current vs. Input Voltage
VOUT=1.2V
VOUT=1.2V
0.80
Short Circuit Current (A)
Short Circuit Current (A)
0.77
1.2
IOUT (A)
0.76
0.75
0.74
0.73
0.72
0.71
0.70
0.75
0.70
0.65
0.69
2.2
2.4
2.6
2.8
3
3.2
0.60
3.4
-50
Input Voltage (V)
-25
0
25
50
75
o
Temperature ( C)
Dropout Voltage vs. IOUT
PSRR
-40
600
-45
-50
500
PS RR (dB)
Dropout Voltage (mV)
VOUT=3.3V
700
400
300
-55
-60
-65
-70
200
25°C
100
-75
85°C
-40°C
0
0
0.2
0.4
0.6
0.8
1
1.2
IOUT(A)
AP7168 Rev. 1
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-80
100
1000
10000
Frequency (Hz)
100000
NOVEMBER 2009
© Diodes Incorporated
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
(Continued)
Line Transient Response
Line Transient Response
VIN =3V to 5.5V
VIN =5.5V to 3V
COUT =10uF
(Ceramic)
COUT =10uF
(Ceramic)
VIN
2V/div
VIN
2V/div
VOUT
50mV/div
VOUT
50mV/div
Time (500us/div)
Time (5ms/div)
Output Load Transient Response (VOUT=1.8V)
Output Load Transient Response (VOUT=3.3V)
COUT=470uF (electrolytic)
VOUT
COUT=10uF (Ceramic)
100mV/div
COUT=470uF (electrolytic)
VOUT
COUT=10uF (Ceramic)
100mV/div
COUT=1uF (Ceramic)
COUT=1uF (Ceramic)
1.2A
IOU
1.2A
1A/us
500mA/div
IOU
1A/us
500mA/div
50mA
50mA
Time (100us/div)
Time (100us/div)
Start-up Time (VOUT=1.2V, IOUT=0.1A)
Start-up Time (VOUT=1.2V, IOUT=1.2A)
VEN
2V/div
VEN
2V/div
COUT=10uF
COUT=10uF
VOUT
1V/div
VOUT
1V/div
VPOK
2V/div
VPOK
2V/div
Time (50us/div)
AP7168 Rev. 1
Time (50us/div)
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Typical Performance Characteristics
(Continued)
Current Limit vs. Temperature
Current Limit (A)
1.8
1.7
1.6
1.5
VIN =2.8V,Vout=1.8V
VIN =3.3V,Vout=1.8V
1.4
-50
-25
0
25
50
75
100
Temperature (oC)
Application Note
VIN
Input Capacitor
A 1μF ceramic capacitor is recommended to connect
between IN and GND pins to decouple input power
supply glitch and noise. The amount of the capacitance
may be increased without limit. A lower ESR (Equivalent
Series Resistance) capacitor allows the use of less
capacitance, while higher ESR type requires more
capacitance. This input capacitor should be located as
close as possible to the device to assure input stability
and less noise. For PCB layout, a wide copper trace is
required for both IN and GND.
Output Capacitor
The output capacitor is required to stabilize and help the
transient response of the LDO. The AP7168 is designed
to have excellent transient response for most
applications with a small amount of output capacitance.
The AP7168 is stable for all available types and values
of output capacitors ≥ 4.7μF. The device is also stable
with multiple capacitors in parallel, which can be of any
type of value. Additional capacitance helps to reduce
undershoot and overshoot during transient. This
capacitor should be placed as close as possible to OUT
and GND pins for optimum performance.
Adjustable Operation
The AP7168 provides output voltage from 0.8V to 5.0V
through external resistor divider as shown below.
AP7168 Rev. 1
VOUT
IN
CIN
OUT
100kOhm
R1
AP7168
POK
COUT
FB
R2
Enable
EN
GND
The output voltage is calculated by:
⎛
R ⎞
VOUT = VREF ⎜⎜1 + 1 ⎟⎟
R2 ⎠
⎝
Where VREF=0.8V (the internal reference voltage)
Rearranging the equation will give the following
equation to find the approximate resistor divider values:
⎛V
⎞
R1 = R 2 ⎜⎜ OUT − 1⎟⎟
⎝ VREF
⎠
To maintain the stability of the internal reference voltage,
R2 needs to be kept smaller than 250kΩ.
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Application Note
(Continued)
No Load Stability
Other than external resistor divider, no minimum load is
required to keep the device stable. The device will
remain stable and regulated in no load condition.
Wide Output Range
The AP7168, with a wide output range of 0.8V to 5.0V,
provides a versatile solution for many portable and low
power applications.
ENABLE/SHUTDOWN Operation
The AP7168 is turned on by setting the EN pin high, and
is turned off by pulling it low. If this feature is not used,
the EN pin should be tied to IN pin to keep the regulator
output on at all time. To ensure proper operation, the
signal source used to drive the EN pin must be able to
swing above and below the specified turn-on/off voltage
thresholds listed in the Electrical Characteristics section
under VIL and VIH.
Thermal Shutdown Protection
Thermal protection disables the output when the
junction temperature rises to approximately +145°C,
allowing the device to cool down. When the junction
temperature reduces to approximately +120°C the
output circuitry is enabled again. Depending on power
dissipation,
thermal
resistance,
and
ambient
temperature, the thermal protection circuit may cycle on
and off. This cycling limits the heat dissipation of the
regulator, protecting it from damage due to overheating.
POWER-OK
The Power-Ok (POK) pin is an active high open-drain
output. It can be connected to any 5.5V or lower rail
through an external pull-up resistor.
The
recommended sink current of POK pin is up to 4mA, so
the pull-up resistor for POK should be in the range of
10kΩ to 1MΩ. If output voltage monitoring is not needed,
the POK pin can be left floating.
Current Limit Protection
When output current at OUT pin is higher than current
limit threshold, the current limit protection will be
triggered and clamp the output current to approximately
1.6A (1.2A min) to prevent over-current and to protect
the regulator from damage due to overheating.
Short Circuit Protection
When OUT pin is short-circuited to GND or OUT
voltage is less than 200mV, short circuit protection
be triggered and clamp the output current
approximately 750mA. This feature protects
regulator from over-current and damage due
overheating.
pin
will
to
the
to
Power Dissipation
The device power dissipation and proper sizing of the
thermal plane that is connected to the thermal pad is
critical to avoid thermal shutdown and ensuring reliable
operation. Power dissipation of the device depends on
input voltage and load conditions and can be calculated
by:
PD = ( VIN − VOUT )xIOUT
The AP7168 is available in the SOP-8L-EP packages,
both with exposed pad, which is the primary conduction
path for heat to the printed circuit board (PCB). The pad
can be connected to ground or be left floating; however,
to ensure the device will not overheat, it should be
attached to an appropriate amount of copper PCB area.
However, the maximum power dissipation that can be
handled by the device depends on the maximum
junction to ambient thermal resistance, maximum
ambient temperature, and maximum device junction
temperature, which can be approximated by the
equation below:
Low Quiescent Current
The AP7168, consuming only around 150µA for all input
range and output loading, provides great power saving
in portable and low power applications.
AP7168 Rev. 0.1
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PD ([email protected] TA ) =
( +150°C − TA )
R θJA
NOVEMBER 2009
© Diodes Incorporated
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Marking Information
(1) SOP-8L-EP
( Top View )
5
8
G : Green
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
SOP-8L-EP
Logo
AP7168
YY WW X X E
Part No.
1
Package Information
4
(All Dimensions in mm)
(1) Package Type: SOP-8L-EP
Detail "A"
Exposed pad
2.4Ref.
3.70/4.10
45°
0.35max.
3.85/3.95
5.90/6.10
7°~9°
7°~9° 1
1
0.15/0.25
Bottom View
1.75max.
1.30/1.50
3.3Ref.
0/0.13
0.254
0.3/0.5
1.27typ
4.85/4.95
1
Gauge Plane
Seating Plane
0.62/0.82
Detail "A"
8x-0.60
5.4
Exposed pad
8x-1.55
6x-1.27
Land Pattem Recommendation
(Unit:mm)
Notes:
6. All dimensions are in millimeters. Angles are in degrees.
7. Coplanarity applies to the exposed heat sink slug as well as the terminals.
AP7168 Rev. 1
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AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDING TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
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Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems
without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
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Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
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Copyright © 2009, Diodes Incorporated
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AP7168 Rev. 1
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