Page 1
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Features
• 150mA Low Dropout Regulator with EN
• Very low I
• 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)
over full load: 65µA
Q
Applications
• Notebook and Desktop Computers and Pheripherals
• Portable Devices
• Battery Powered Devices
• CD-ROM, DVD and LAN Cards
Typical Application Circuit
V
IN
IN
OUT
Description
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.
V
OUT
V
IN
IN
OUT
V
OUT
AP7311
EN
Adjustable O u tp u t
ADJ
GND
R1
1uF
R2
1uF
Enable
AP7311
EN
GND
Fixed Output
1uF
1uF
Enable
⎛
⎜
1VV
REFOUT
⎜
⎝
⎞
R
1
⎟
+=
⎟
R
2
⎠
AP7311 Rev. 2 1 of 13 NOVEMBER 2009
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Page 2
Ordering Information
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
AP7311 - XX XX G - 7
Output
Blank : ADJ
Package Green
W : SOT25
G : Green
Packing
7 : Tape & Reel
10 : 1.0V
12 : 1.2V
15 : 1.5V
18 : 1.8V
20 : 2.0V
25 : 2.5 V
28 : 2.8V
30 : 3.0V
33 : 3.3V
Device Package Code
Packaging
(Note 2)
AP7311-XXWG-7 W SOT25 3000/Tape & Reel -7
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/datasheets/ap02001.pdf.
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
7” Tape and Reel
Quantity Part Number Suffix
AP7311 Rev. 2 2 of 13 NOVEMBER 2009
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Page 3
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Pin Assignment
(1) SOT25 (Fixed Output) (2) SOT25 (Adj Output)
AP7311
( Top View )
1
IN
2
GND
3
EN
5
4
OUT
NC
IN
GND
EN
( Top View )
1
2
3
5
4
OUT
Pin Descriptions
Pin Number
Pin Name
IN 1 1 Voltage input pin. Bypass to ground through at least 1µF capacitor
GND 2 2 Ground
EN 3 3 Enable input, active high
ADJ - 4 Output feedback pin
NC 4 - No connection
OUT 5 5
SOT25
(fixed)
SOT25
(adj)
Voltage output pin. Bypass to ground through 1µF ceramic
capacitor
Description
ADJ
AP7311 Rev. 2 3 of 13 NOVEMBER 2009
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Page 4
Functional Block Diagram
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
IN
EN
Gate
Driver
Fixed Version
Current Limit
and Thermal
Shutdown
0.4V
OUT
R
R
GND
IN
EN
Gate
Driver
Adjusta b le V e r s io n
Current Limit
and Thermal
Shutdown
0.4V
OUT
ADJ
GND
Absolute Maximum Ratings
Symbol Parameter Ratings Units
ESD HBM Human Body Model ESD Protection 6 kV
ESD MM Machine Model ESD Protection 400 V
VIN Input Voltage 7 V
EN Voltage VIN + 0.3 V
Continuous Load Current Internal Limited
TOP Operating Junction Temperature Range -40 ~ 125 °C
TST Storage Temperature Range -65 ~150 °C
PD Power Dissipation (Note 3) SOT25 640 mW
TJ Maximum Junction Temperature 150 °C
Recommended Operating Conditions
Symbol Parameter Min Max Unit
V
IN
I
OUT
T
A
Notes: 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 4 of 13 NOVEMBER 2009
Input voltage 2 6 V
Output Current (Note 4) 0 150 mA
Operating Ambi e nt Temperature -40 85
°C
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Page 5
⎯
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Electrical Characteristics
(TA = 25oC, V
Symbol Parameter Test Conditions Min Typ. Max Unit
I
I
SHDN
I
LEAK
V
Dropout
V
REF
I
ADJ
V
OUT
ΔV
/ΔV
ΔV
/V
OUT
tST
PSRR
I
SHORT
I
LIMIT
V
V
I
EN
T
SHDN
T
HYS
θ
Notes: 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
= V
+1V, C
IN
OUT
Input Quiescent Current
Q
Input Shutdown Current VEN = 0V, I
Input Leakage Current VEN = 0V, OUT grounded
Dropout Voltage (Note 5) I
ADJ Reference Voltage
version)
ADJ Leakage (Adjustable version)
Output Voltage Accuracy
OUT
Line Regulation
/V
IN
OUT
Load Regulation
Start-up Time
PSRR
Short-circuit Current V
Current Limit
EN Input Logic Low Voltage VIN = V
IL
EN Input Logic High Voltage VIN = V
IH
EN Input Current VIN = 0V or V
= 1uF, C
IN
OUT
= 1uF, V
= 2V, unless otherwise stated)
EN
= VIN, I
V
EN
V
EN
= VIN, I
OUT
OUT
OUT
= 0mA
= 150mA 65 85
= 0mA
⎯
⎯
= 150mA 150 300 mV
OUT
(Adjustable
I
= 0mA 0.4 V
OUT
⎯
T
= -40oC to 85oC,
A
= 30mA
I
OUT
= (V
V
IN
V
EN
= (V
V
IN
I
OUT
V
EN
I
OUT
V
= [V
IN
f = 100Hz, I
= V
IN
V
= (V
IN
V
OUT/ROUT
+1V) to V
OUT
= VIN, I
OUT
+1V) to V
OUT
= 1mA
from 1mA to 150mA
= 0V to 2.0V, V
= 150mA
+1V]VDC + 0.5V
OUT
= 30mA
OUT
to V
IN-Min
+1V) to V
OUT
= 0.5A
to V
IN-Min
to V
IN-Min
IN-Max
,
IN-Max
,
IN-Max
= 1.8V
OUT
ppAC
, V
IN-Max
IN-Max
IN-Max
< 0.2V 50 mA
OUT
,
IN-Max
0.4 V
1.4 V
-1 1 μA
-2 2 %
-0.6 0.6 %
,
200 300 mA
Thermal Shutdown Threshold 140
Thermal Shutdown Hysteresis 15
Thermal Resistance
JA
Junction-to-Ambient
SOT25 (Note 6) 190
55 75
1
1
μA
μA
μA
1 μA
0.01 0.20 %/V
80 μs
65 dB
°C
°C
o
C/W
AP7311 Rev. 2 5 of 13 NOVEMBER 2009
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Page 6
150mA, Low Quiescent Current, Fast Transient
Typical Performance Characteristics
AP7311
Low Dropout Linear Regulator
Quies cent Curr ent vs Input Vol t a ge
60
Iload=150mA
Vout=1.8V
56
52
48
Quiesc ent Current (uA)
44
40
25℃
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
90℃
-45℃
Input Voltage (V)
Quies cent Current (uA )
Quiescent Curr ent vs I nput Voltage
60
Iload=0mA
Vout=1.8V
56
52
48
44
40
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
90℃
25℃
Input Vol t a ge (V )
-45℃
Reference Voltage vs Input Voltage
0.41
-45℃
0.405
0.4
0.395
Referenc e Volt a ge (V )
0.39
2 2.5 3 3.5 4 4.5 5 5.5 6
25℃
90℃
Input Vol tage (V )
0.06
Vout=1.8V
0.05
V
0.04
0.03
0.02
0.01
Output V ol tage Vari at i on (%)
0
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
Line Regulation (%/V)
in=Vout +1V
90℃
25℃
-45℃
Input Vol tage (V)
Load Regulation (%)
2.4
Vout=1.8V
2
in=Vout +1V
V
1.6
1.2
0.8
0.4
0
Output V ol tage Variation (% )
-0.4
0 30 60 90 120 150
-45℃
90℃
25℃
Output Current (mA)
200
Vout=2.5V
160
120
80
Dropout Volt age (m V)
40
0
0 25 50 75 100 125 150
Dropout Vol tage
90℃
25℃
-45℃
Output Current (mA)
AP7311 Rev. 2 6 of 13 NOVEMBER 2009
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Page 7
150mA, Low Quiescent Current, Fast Transient
Typical Performance Characteristics (Continued)
AP7311
Low Dropout Linear Regulator
Short Ci r c uit vs Input Vol tage
55
Vout=1.8V
50
45
40
Output Current (m A)
35
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
25℃
-45℃
90℃
Input Voltage (V)
360
350
340
330
320
310
Current Limi t (m A )
300
290
280
Current Li m i t v s I nput Vol t age
Vout=0.8V
a=25℃
T
2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 6
Input Voltage (V)
80
75
70
65
60
55
50
PSRR (dB)
45
40
35
0.1 1 10 100
Vout=0.8V
Vin=5V
Cin=Cout=1uF
Ta=25℃
Frequency (k Hz )
PSRR
80
75
70
65
60
55
50
PSRR (dB)
45
40
35
0.1 1 10 100
PSRR
Vout=1.8V
Vin=2.8V
Cin=Cout=1uF
Ta=25℃
Frequenc y (kHz )
AP7311 Rev. 2 7 of 13 NOVEMBER 2009
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Page 8
150mA, Low Quiescent Current, Fast Transient
Typical Performance Characteristics (Continued)
Start-Up Time (No Load)
Start-Up Time (150mA Load)
AP7311
Low Dropout Linear Regulator
Ven=0 to 2V (1V/div)
Vin=2.8V
Cin=Cout=1uF
Vout=1.8V (1V/div)
Time (50us/div)
Line Transient Response
Vin=2.8V to 3.8V (1V/div)
Tr=15us
Vout=1.8V (50mV/div)
Ven=0 to 2V (1V/div)
Vin=2.8V
Cin=Cout=1uF
Vout=1.8V (1V/div)
Iout=150mA (150mA/div)
Time (50us/div)
Line Transient Response
Vin=3.8V to 2.8V (1V/div)
Tf=15us
Vout=1.8V (50mV/div)
Iout=150mA (150mA/div)
Time (50us/div)
Iout=150mA (150mA/div)
Time (50us/div)
AP7311 Rev. 2 8 of 13 NOVEMBER 2009
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Page 9
150mA, Low Quiescent Current, Fast Transient
Typical Performance Characteristics (Continued)
Load Transient Response
Tr=Tf=15us
Vin=2.8V
Load Transient Response
Vout=1.8V
(100mV/div)
Tr=Tf=15us
Vin=6V
AP7311
Low Dropout Linear Regulator
Vout=5.0V
(100mV/div)
Iout=1mA to 150mA
(50mA/div)
Time (50us/div)
Iout=1mA to 150mA
(50mA/div)
Time (50us/div)
AP7311 Rev. 2 9 of 13 NOVEMBER 2009
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Page 10
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
Application Note
Input Capacitor
A 1μF ceramic capacitor is recommended to connect between
and GND pins to decouple input power supply glitch and
V
IN
noise. The amount of the capacitance may be increased
without limit. This i nput 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 V
GND. A lower ESR capacitor allows the use of less
capacitance, while higher ESR type requires more
capacitance.
IN
and
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 Opera ti on
The AP7311 provides output voltage from 0.8V to 5.0V through
external resistor divider as shown below.
The output voltage is calculated by:
Where V
Rearranging the equation will give the following that is used for
adjusting the output to a particular voltage:
To maintain the s tability of the internal ref erence voltage, R
need to be kept smaller than 125kΩ.
V
IN
1uF
=0.4V (the internal reference voltage)
REF
Enable
IN
OUT
AP7331
EN
GND
REFOUT
⎛
V
⎜
RR
21
⎜
⎝
R1
ADJ
R2
⎛
R
⎜
1VV
+=
⎜
R
⎝
OUT
−= 1
V
REF
V
OUT
1uF
⎞
1
⎟
⎟
2
⎠
⎞
⎟
⎟
⎠
2
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 10 of 13 N OVEMBER 2009
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Characteristics section under VIL and VIH.
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 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.
Fast Transient Response
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 baseba nd circuitr y into standby mod e 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
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.
Page 11
Marking Information
(1) SOT25
( Top View )
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
5
7
4
XX : Identification code
Y
: Year 0~9
Y
W X
: Week : A~Z : 1~26 week;
W
XX
a~z : 27~52 week; z represents
52 and 53 week
X
1 2 3
Device Package Identification Code
AP7311-ADJ SOT25
AP7311-10
AP7311-12
AP7311-15
AP7311-18
AP7311-20
AP7311-25
AP7311-28
AP7311-30
AP7311-33
: A~Z : Green
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
SOT25
RM
RN
RP
RR
RS
RT
RU
RV
RW
RX
AP7311 Rev. 2 11 of 13 N OVEMBER 2009
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Page 12
150mA, Low Quiescent Current, Fast Transient
Package Information (All Dimensions in mm)
(1) Package Type: SOT25
AP7311
Low Dropout Linear Regulator
AP7311 Rev. 2 12 of 13 N OVEMBER 2009
www.diodes.com © Diodes Incorporated
Page 13
AP7311
150mA, Low Quiescent Current, Fast Transient
Low Dropout Linear Regulator
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BU T NOT LIMI TED TO, T HE IMPLIE D WARRANT IES OF ME RCHANTABILIT Y AND FI TNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any
liability arisi ng out of the application or use of this document or any product descr ibed herein; neither does Diode s Incorporated
convey any license under its patent or trademark rig hts, nor the rights of othe rs. Any Customer or user of this docume nt or products
described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the
companies whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporat ed does not warrant or accept a ny liabil ity whatsoeve r in respect of any p roducts purc hase d through unau thori zed
sales channel.
Should Customers purch ase or use Diodes Incorpo rated products for an y unintended or unau thorized applic ation, Customers sh all
indemnify and hold Dio des Inc orporated and its re presen tatives harmle ss against all cla ims, d amages, expens es, a nd attor ney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized
application.
Products described here in may be covered by one or more Unit ed States, i nternationa l or foreign patents p ending. Product n ames
and markings noted herein may also be covered by one or more United States, i nte rn ational or foreign trademarks.
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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 Executi ve Off icer of Diodes Incorporate d. As us e d herei n:
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 crit ical com ponent is any c omponent in a life sup port devic e or system whose failure to perform c an be reasona bly expec ted
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers repres ent that th ey have all necessar y expertis e in th e safety a nd regul ator y ramific ations of t heir lif e support devic es or
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concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstandin g any devices- or systems-related i nformation or support that may be provided by Diodes Incorporated. Further,
Customers must full y indemnify Diode s Incorporat ed and its represent atives ag ainst any damages ari sing out of th e use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2009, Diodes Incorporated
www.diodes.com
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