Diodes AP7168 User Manual
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Description
Pin Assignments
The AP7168 is a 1.2A, adjustable output voltage, ultra-low
dropout linear regulator. The device includes pass e lement,
error amplifier, band-gap reference, current limit and thermal
shutdown circuitry. The device is turned on when EN pin is
IN
1
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
POK
NC
2
3
applications, for example, laptop computers, audio and video
applications, and battery powered devices. The typical
EN
4
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 SO-8EP package.
Features
NEW PRODUCT
• 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 (I
• Adjustable output voltage range: 0.8V to 5.0V
• Very fast transient response
• High PSRR
• Accurate voltage regulation
): 125µA typical
Q
Applications
• Servers and laptops
• Smart phone and PDA
• MP3/MP4
• Bluetooth headset
• Low and medium power applications
• FPGA and DSP core or I/O power
• Current limiting and short circuit protection
• Thermal shutdown protection
• Stable with any type output capacitor ≥ 4.7µF
• Ambient temperature range -40ºC to 85°C
• SO-8EP: Available in “Green” Molding Compound (No
Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Notes: 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.
( Top View )
SO-8EP
8
OUT
FB
7
NC
6
5
GND
Typical Application Circuit
AP7168
Document number: DS32019 Rev. 2 - 2
V
IN
1µF
100kOhm
Enable
IN
POK
EN
AP7168
OUT
R
FB
R
GND
V
OUT
1
2
10µF
⎛
⎜
REFOUT
⎜
⎝
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⎞
R
1
⎟
1VV
+=
⎟
R
2
⎠
September 2010
© Diodes Incorporated
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
Pin Descriptions
Name Pin Number Description
IN 1 Voltage input pins, to be tied together externally. Bypass to ground through at least 1µF capacitor.
POK 2 Power-OK output, active-high open-drain.
EN 4 Enable input, active high.
GND 5 Ground.
FB 7 Output feedback.
OUT 8
NC 3, 6 No connection.
Functional Block Diagram
Voltage output pins, to be tied together externally. Bypass to ground through at least 4.7µF
ceramic capacitor.
NEW PRODUCT
Absolute Maximum Ratings
Symbol Parameter Ratings Unit
ESD HBM Human Body Model ESD Protection 4 KV
ESD MM Machine Model ESD Protection 300 V
VIN Input Voltage 7 V
OUT, FB, POK, EN Voltage VIN + 0.3 V
Continuous Load Current Internal Limited
TJ Operating Junction Temperature Range -40 ~ 150 °C
TST Storage Temperature Range -65 ~150 °C
P
Power Dissipation SO-8EP (Note 2, 4) 4.0 W
D
Notes: 2. Ratings apply to ambient temperature at 25°C
EN
POK
IN
Gate
Driver
Current Limit
and Thermal
Shutdown
0.8V
0.744V
OUT
FB
GND
Recommended Operating Conditions
Symbol Parameter Min Max Unit
V
IN
I
OUT
T
A
AP7168
Document number: DS32019 Rev. 2 - 2
Input voltage 2.2 5.5 V
Output Current 0 1.2 A
Operating Ambient Temperature -40 85
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°C
September 2010
© Diodes Incorporated
Electrical Characteristics
= 25oC, V
(T
A
Symbol Parameter Test Conditions Min Typ. Max Unit
I
SHDN
V
Dropout
V
V
ΔV
OUT
ΔV
IN
ΔV
OUT
PSRR
NEW PRODUCT
I
I
SHORT
VOL
V
POK_TH_UP
V
POK_Hys
POK deglitch
I
POK_LK
T
T
Notes: 3. POK pin must be disconnected from IN pin.
layer and thermal vias to bottom layer ground plane.
= V
IN
I
Q
+1V, C
OUT
Input Quiescent Current I
= 1μF, C
IN
OUT
Input Shutdown Current VEN = 0V, I
Dropout Voltage
FB reference voltage 0.8 V
REF
I
FB
OUT
/ V
tST
/
FB leakage
Output Voltage Total Accuracy -3 3 %
Line Regulation
OUT
V
Load Regulation I
OUT
Start-up Time, from EN high to POK
high
Power Supply Rejection Ratio
LIMIT
V
IL
V
IH
I
EN
Current limit
Short-circuit Current V
EN Input Logic Low Voltage 0.4 V
EN Input Logic High Voltage 1.4 V
EN Input leakage V
POK output low voltage Force 2mA 100 200 mV
Output voltage (rising) POK threshold
Output voltage POK hysteresis 4% V
V
POK leakage current V
SHDN
HYS
θ
JA
4. Test condition for SO-8EP: Device mounted on 2" x 2" FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top
Thermal shutdown threshold 145
Thermal shutdown hysteresis 25
Thermal Resistance Junction-to-
Ambient
= 1μF, V
1.2A LOW DROPOUT REGULATOR WITH POK
= 2V, unless otherwise stated)
EN
V
V
OUT
OUT
OUT
= 0
≥ 1.5V, I
≥ 1.5V, I
= 0 (Note 3) -1 0.1 1 µA
OUT
= 0.5A
OUT
= 1A
OUT
⎯
⎯
VIN = V
I
OUT
OUT
V
EN
V
IN
1kHz, V
I
OUT
V
OUT
IN
EN
FB (or OUT for fixed version)
rising
IN
POK
+1V to 5.5V,
OUT
= 1mA
from 1mA to 1A -1.5 1.5 %
= 0V to 2.0V, I
= 100mA,
OUT
= 3.3V
= 3.3V, V
IN
= 1.2V,
OUT
= 100mA
= 1.8V, R
= 3.3V, V
= 0V or 5.5V
= 0.5Ω
OUT
< 0.2V 750 mA
OUT
1.2 1.6 A
⎯
87% 92% 97% V
= 3.3V, V
= 5.5V
= 1.2 V 160 µs
OUT
⎯
SOP-8L-EP (Note 4) 27
125 180 µA
230 mV
500 800 mV
0.01 1 µA
0.02 %/V
190 µs
60 dB
0.01 1 µA
0.01 1 µA
AP7168
ref
ref
°C
°C
o
C/W
AP7168
Document number: DS32019 Rev. 2 - 2
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September 2010
© Diodes Incorporated
Typical Performance Characteristics
AP7168
1.2A LOW DROPOUT REGULATOR WITH POK
NEW PRODUCT
Output Voltage vs. Temperature
3.40
3.35
3.30
3.25
Output Voltage (V)
3.20
VOUT = 3.3V
-50 -25 0 25 50 75 100 125
Temperature (0C)
Quiescent Current vs. Input Voltage
=3.3V
V
OUT
170
A)
155
μ
140
125
110
95
Quiescent Current (
80
4.0 4.3 4.6 4.9 5.2 5.5
Input Voltage (V)
Iout=0mA
Iout=500mA
Output Voltage vs. Temperature
1.30
1.25
1.20
1.15
VOUT = 1.2V
Output Voltage (V)
1.10
-50-25 0 255075100125
Temperature (0C)
Quiescent Current vs. I
V
=1.8V
170
A)
160
μ
150
140
130
120
110
Quiescent Current (
100
OUT
0.0 0. 2 0.4 0.6 0.8 1.0 1. 2
I
(A)
OUT
OUT
VIN=2.5V
VIN=3.3V
Quiescent Current vs. Temperatu re
170
A)
π
155
140
125
110
95
Quiescent Current (
80
-50.0 -25.0 0.0 25.0 50. 0 75.0 100.0 125.0
Temperature (0C)
AP7168
Document number: DS32019 Rev. 2 - 2
Reference Voltage vs. Temperature
0.810
0.805
0.800
VIN=2.2V, Vout=1.0V
VIN=3.3V, Vout=1.8V
VIN=5.0V, Vout=3.3V
0.795
Reference Voltage (V)
0.790
-50-25 0 255075100125
Vin=2.2V
Vin=3.3V
Vin=5.5V
Temperature (0C)
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September 2010
© Diodes Incorporated
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