AP7311

AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Description
Features
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150mA Low Dropout Regulator with EN
Very low IQ over full load: 65µA
Wide input voltage range: 2V to 6V
Wide adjustable output: 0.8V to 5.0V
Fixed output options: 1.0V to 3.3V
PSRR: 65dB at 100Hz
Fast start-up time: 80µs
Stable with low ESR, 1µF ceramic output capacitor
Excellent Load/Line Transient Response
Low dropout: 150mV typical at 150mA
Current limit protection
Short circuit protection
Thermal shutdown protection
Ambient temperature range: -40ºC to 85°C
SOT25: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
The AP7311 is a 150mA, adjustable and fixed output voltage, low
dropout linear regulator. The device included pass element, error
amplifier, band-gap, current limit and thermal shutdown circuitry.
The device is turned on when EN pin is set to logic high level.
The characteristics of low dropout voltage and low quiescent
current make it suitable for low power applications, for example,
battery powered devices. The typical quiescent current is
approximately 65μA.
Built-in current-limit and thermal-shutdown functions prevent IC
from damage in fault conditions.
The AP7311 is available in SOT25 package.
Applications
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Notebook and Desktop Computers and Pheripherals
Portable Devices
Battery Powered Devices
CD-ROM, DVD and LAN Cards
Typical Application Circuit
VIN
VOUT
IN
VIN
VOUT
IN
OUT
AP7311
AP7311
1uF
Enable
OUT
1uF
EN
R1
1uF
1uF
Enable
ADJ
EN
GND
GND
Fixed Output
Adjustable Output
R2
⎛
R ⎞
VOUT = VREF ⎜⎜1 + 1 ⎟⎟
R2 ⎠
⎝
AP7311 Rev. 2
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Ordering Information
AP7311 - XX XX G - 7
Output
Package
Blank : ADJ
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
20 : 2.0V
25 : 2.5V
28 : 2.8V
30 : 3.0V
33 : 3.3V
Device
AP7311-XXWG-7
Notes:
W : SOT25
Package Code
W
Packaging
(Note 2)
SOT25
Green
Packing
G : Green
7 : Tape & Reel
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
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.
AP7311 Rev. 2
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Pin Assignment
(1) SOT25 (Fixed Output)
(2) SOT25 (Adj Output)
( Top View )
( Top View )
IN 1
5 OUT
GND 2
IN 1
5 OUT
GND 2
4 NC
EN 3
EN 3
4 ADJ
Pin Descriptions
Pin Name
IN
GND
EN
ADJ
NC
OUT
AP7311 Rev. 2
Pin Number
SOT25
SOT25
(fixed)
(adj)
1
1
2
2
3
3
4
4
5
5
Description
Voltage input pin. Bypass to ground through at least 1µF capacitor
Ground
Enable input, active high
Output feedback pin
No connection
Voltage output pin. Bypass to ground through 1µF ceramic
capacitor
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Functional Block Diagram
OUT
IN
Gate
Driver
EN
Current Limit
and Thermal
Shutdown
OUT
IN
EN
R
Gate
Driver
Current Limit
and Thermal
Shutdown
ADJ
0.4V
0.4V
R
GND
GND
Adjustable Version
Fixed Version
Absolute Maximum Ratings
Symbol
ESD HBM
ESD MM
VIN
TOP
TST
PD
TJ
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Input Voltage
EN Voltage
Continuous Load Current
Operating Junction Temperature Range
Storage Temperature Range
Power Dissipation (Note 3)
Maximum Junction Temperature
SOT25
Ratings
6
400
7
VIN + 0.3
Internal Limited
-40 ~ 125
-65 ~150
640
150
Units
kV
V
V
V
°C
°C
mW
°C
Recommended Operating Conditions
Symbol
VIN
IOUT
TA
Notes:
Parameter
Input voltage
Output Current (Note 4)
Operating Ambient Temperature
Min
2
0
-40
Max
6
150
85
Unit
V
mA
°C
3. Ratings apply to ambient temperature at 25°C
4. The device maintains a stable, regulated output voltage without a load current.
AP7311 Rev. 2
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Electrical Characteristics
o
(TA = 25 C, VIN = VOUT +1V, CIN = 1uF, COUT = 1uF, VEN = 2V, unless otherwise stated)
Symbol
Parameter
Input Quiescent Current
IQ
ISHDN
ILEAK
VDropout
VREF
Input Shutdown Current
Input Leakage Current
Dropout Voltage (Note 5)
ADJ Reference Voltage (Adjustable
version)
IADJ
ADJ Leakage (Adjustable version)
VOUT
Output Voltage Accuracy
ΔVOUT
Line Regulation
/ΔVIN/V
ΔVOUT
Load Regulation
/VOUT
Start-up Time
tST
PSRR
PSRR
ISHORT
Short-circuit Current
ILIMIT
Current Limit
VIL
VIH
IEN
TSHDN
THYS
EN Input Logic Low Voltage
EN Input Logic High Voltage
EN Input Current
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Thermal Resistance
Junction-to-Ambient
θJA
Notes:
Test Conditions
VEN = VIN, IOUT = 0mA
VEN = VIN, IOUT = 150mA
VEN = 0V, IOUT = 0mA
VEN = 0V, OUT grounded
IOUT = 150mA
IOUT= 0mA
Min Typ. Max Unit
55
75
⎯
μA
65
85
μA
1
⎯
μA
1
⎯
150 300 mV
0.4
V
1
μA
⎯
TA = -40oC to 85oC,
-2
2
%
IOUT = 30mA
VIN = (VOUT +1V) to VIN-Max,
0.01 0.20 %/V
VEN = VIN, IOUT = 1mA
VIN = (VOUT +1V) to VIN-Max,
-0.6
0.6
%
IOUT from 1mA to 150mA
VEN = 0V to 2.0V, VOUT = 1.8V
80
μs
IOUT = 150mA
VIN = [VOUT +1V]VDC + 0.5VppAC,
65
dB
f = 100Hz, IOUT = 30mA
VIN = VIN-Min to VIN-Max, VOUT < 0.2V
50
mA
VIN = (VOUT +1V) to VIN-Max,
200 300
mA
VOUT/ROUT = 0.5A
VIN = VIN-Min to VIN-Max
0.4
V
VIN = VIN-Min to VIN-Max
1.4
V
VIN = 0V or VIN-Max
-1
1
μA
140
°C
15
°C
SOT25 (Note 6)
190
o
C/W
5. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops 2% below its nominal value.
This parameter only applies to output voltages above 1.8V.
6. Test conditions for SOT25: Device mounted on FR-4 substrate PCB, with minimum recommended pad layout, 2oz copper, single sided
AP7311 Rev. 2
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Typical Performance Characteristics
Quiescent Current vs Input Voltage
Iload=150mA
Quiescent Current vs Input Voltage
Iload=0mA
60
60
Vout=1.8V
90℃
52
48
25℃
56
Quiescent Current (uA)
Quiescent Current (uA)
Vout=1.8V
56
-45℃
44
90℃
52
48
44
25℃
40
2.8
3.2
3.6
4
4.4
4.8
5.2
5.6
2.8
6
3.2
3.6
4
Reference Voltage vs Input Voltage
4.8
5.2
5.6
5.2
5.6
6
Line Regulation (%/V)
0.41
0.06
Output Voltage Variation (%)
Reference Voltage (V)
4.4
Input Voltage (V)
Input Voltage (V)
-45℃
0.405
0.4
25℃
0.395
90℃
Vout=1.8V
Vin=Vout +1V
0.05
90℃
0.04
25℃
0.03
0.02
-45℃
0.01
0
0.39
2
2.5
3
3.5
4
4.5
5
5.5
2.8
6
3.2
3.6
4
Input Voltage (V)
4.4
4.8
6
Input Voltage (V)
Dropout Voltage
Load Regulation (%)
2.4
200
Vout=1.8V
Vin=Vout +1V
2
Vout=2.5V
-45℃
90℃
160
Dropout Voltage (mV)
Output Voltage Variation (%)
-45℃
40
1.6
90℃
1.2
0.8
25℃
0.4
25℃
120
80
-45℃
40
0
0
-0.4
0
30
60
90
120
150
Output Current (mA)
AP7311 Rev. 2
0
25
50
75
100
125
150
Output Current (mA)
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Typical Performance Characteristics
(Continued)
Current Limit vs Input Voltage
Short Circuit vs Input Voltage
55
360
50
45
40
25℃
Vout=0.8V
Ta=25℃
350
-45℃
Current Limit (mA)
Output Current (mA)
Vout=1.8V
90℃
340
330
320
310
300
290
280
35
2.8
3.2
3.6
4
4.4
4.8
5.2
5.6
2
6
2.4
2.8
3.2
PSRR
4
4.4
4.8
5.2
5.6
6
PSRR
80
80
75
75
Vout=0.8V
Vin=5V
Cin=Cout=1uF
Ta=25℃
65
60
Vout=1.8V
Vin=2.8V
Cin=Cout=1uF
Ta=25℃
70
65
PSRR (dB)
70
PSRR (dB)
3.6
Input Voltage (V)
Input Voltage (V)
55
50
60
55
50
45
45
40
40
35
35
0.1
1
10
100
Frequency (kHz)
AP7311 Rev. 2
0.1
1
10
100
Frequency (kHz)
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Typical Performance Characteristics
(Continued)
Start-Up Time (150mA Load)
Start-Up Time (No Load)
Ven=0 to 2V (1V/div)
Vin=2.8V
Cin=Cout=1uF
Ven=0 to 2V (1V/div)
Vin=2.8V
Cin=Cout=1uF
Vout=1.8V (1V/div)
Vout=1.8V (1V/div)
Iout=150mA (150mA/div)
Time (50us/div)
Time (50us/div)
Line Transient Response
Line Transient Response
Vin=2.8V to 3.8V (1V/div)
Tr=15us
Vin=3.8V to 2.8V (1V/div)
Tf=15us
Vout=1.8V (50mV/div)
Vout=1.8V (50mV/div)
Iout=150mA (150mA/div)
Iout=150mA (150mA/div)
Time (50us/div)
AP7311 Rev. 2
Time (50us/div)
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Typical Performance Characteristics
(Continued)
Load Transient Response
Load Transient Response
Tr=Tf=15us
Vin=2.8V
Vout=1.8V
(100mV/div)
Tr=Tf=15us
Vin=6V
Iout=1mA to 150mA
(50mA/div)
Iout=1mA to 150mA
(50mA/div)
Time (50us/div)
AP7311 Rev. 2
Vout=5.0V
(100mV/div)
Time (50us/div)
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Application Note
Characteristics section under VIL and VIH.
Input Capacitor
A 1μF ceramic capacitor is recommended to connect between
VIN and GND pins to decouple input power supply glitch and
noise. The amount of the capacitance may be increased
without limit. This input capacitor must 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 VIN and
GND. A lower ESR capacitor allows the use of less
capacitance, while higher ESR type requires more
capacitance.
Output Capacitor
The output capacitor is required to stabilize and help transient
response for LDO. The AP7311 is stable with very small
ceramic output capacitors. The recommended capacitance is
from 1μF to 4.7μF, Equivalent Series Resistance (ESR) is from
10mΩ to 200mΩ, and temperature characteristic is X7R or X5R.
Higher capacitance values help to improve load/line transient
response. The output capacitance may be increased to keep
low undershoot/overshoot. Place output capacitor as close as
possible to OUT and GND pins, and keep the leads as short as
possible.
Adjustable Operation
The AP7311 provides output voltage from 0.8V to 5.0V through
external resistor divider as shown below.
V IN
V OUT
IN
E n ab le
R1
1uF
ADJ
EN
GND
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 300mA to prevent
over-current and to protect the regulator from damage due to
overheating.
Short Circuit Protection
When OUT pin is short-circuit to GND or OUT pin voltage is
less than 200mV, short circuit protection will be triggered and
clamp the output current to approximately 50mA. This feature
protects the regulator from over-current and damage due to
overheating.
Thermal Shutdown Protection
Thermal protection disables the output when the junction
temperature rises to approximately +140°C, allowing the device
to cool down. When the junction temperature reduces to
approximately +125°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.
Ultra Fast Start-up
After enabled, the AP7311 is able to provide full power in as
little as tens of microseconds, typically 80µs, without sacrificing
low ground current. This feature will help load circuitry move in
and out of standby mode in real time, eventually extend battery
life for mobile phones and other portable devices.
OUT
A P 73 31
1 uF
Current Limit Protection
R2
Fast Transient Response
The output voltage is calculated by:
⎛
R ⎞
VOUT = VREF ⎜⎜1 + 1 ⎟⎟
⎝ R2 ⎠
Where VREF=0.4V (the internal reference voltage)
Rearranging the equation will give the following that is used for
adjusting the output to a particular voltage:
⎛V
⎞
R 1 = R 2 ⎜⎜ OUT − 1⎟⎟
⎝ VREF
⎠
Fast transient response LDOs can extend battery life.
TDMA-based cell phone protocols such as Global System for
Mobile Communications (GSM) have a transmit/receive duty
factor of only 12.5 percent, enabling power savings by putting
much of the baseband circuitry into standby mode in between
transmit cycles. In baseband circuits, the load often transitions
virtually instantaneously from 100µA to 100mA. To meet this
load requirement, the LDO must react very quickly without a
large voltage drop or overshoot — a requirement that cannot
be met with conventional, general-purpose LDOs.
The AP7311’s fast transient response from 0 to 150mA
provides stable voltage supply for fast DSP and GSM chipset
with fast changing load.
Small Overshoot and Undershoot
To maintain the stability of the internal reference voltage, R2
need to be kept smaller than 125kΩ.
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.
ON/OFF Input Operation
The AP7311 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
AP7311 Rev. 2
The AP7311 has small and controlled overshoot and
undershoot in load and line transitions. This helps to protect
supplied circuit from damage and operation error caused by
glitches. This feature also permits the usage of small value
output decoupling capacitor with AP7311.
Low Quiescent Current
The AP7311, consuming only around 65µA for all input range
and output loading, provides great power saving in portable
and low power applications.
Wide Output Range
The AP7311, with a wide output range of 0.8V to 5.0V,
provides a versatile LDO solution for many portable
applications.
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Marking Information
(1) SOT25
( Top View )
4
7
5
XX Y W X
1
AP7311 Rev. 2
2
3
XX : Identification code
Y : Year 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
52 and 53 week
X : A~Z : Green
Device
Package
Identification Code
AP7311-ADJ
SOT25
RM
AP7311-10
SOT25
RN
AP7311-12
SOT25
RP
AP7311-15
SOT25
RR
AP7311-18
SOT25
RS
AP7311-20
SOT25
RT
AP7311-25
SOT25
RU
AP7311-28
SOT25
RV
AP7311-30
SOT25
RW
AP7311-33
SOT25
RX
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Package Information
(All Dimensions in mm)
(1) Package Type: SOT25
AP7311 Rev. 2
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AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
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without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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AP7311 Rev. 2
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