AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 1 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Lead-free
• Input Voltage Range is from 2.7 to 5.5V
• Dropout Voltage 400mV at 300mA Output Current
• Guaranteed 300mA Output Current
• Internal Ron = 1.5Ω PMOS draws no Base Current
• Low Quiescent Current 50µA
• Output Voltage: 1.5V/1.8V/2.0V/2.5V/2.8V/
• 2.9V/3.0V/3.3V/ 3.5V; Accuracy 2%
• Active Lo w Shutd own Funct ion (EN pin)
• Fast Transient Response
• Good Load Regulation
• Current Limit and Thermal Shutdown Protection
• Short Circuit Current Fold-Back
• Lead Free package: SOT25
• SOT25: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
The AP131 is a 300mA, 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 ON when the EN pin is set to logic high level.
The characteristics of low dropout voltage and less quiescent
current make it good for some critical current applications, for
example, some battery powered devices. The typical quiescent
current is approximately 50µA from zero to maximum load. Due
to the internal flexible design, it results in extensively fixed output
voltage versions and makes it convenient to use for applications.
Built-in current-limit and thermal-shutdown functions prevent any
fault condition from IC damage. An external capacitor can be
connected to the BP pin and reduce the output noise.
Applications
• Battery Powered Device
• Wireless Communication
• CD-ROM, DVD, and LAN Card
• PC Peripheral
Ordering Information
Output Voltage Package Packing
W : SOT25
Lead Free
G : Green
7 : Tape & Reel
L : Lead Free
AP131 - XX W X - 7
15 :1.5V
18 :1.8V
20 :2.0V
25 :2.5V
28 :2.8V
29 :2.9V
30 :3.0V
33 :3.3V
35 :3.5V
Device Package
Code Packaging
(Note 2) 7” Tape and Reel
Quantity Part Number Suffix
AP131-XXWL-7 W SOT25
3000/Tape & Reel -7
AP131-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/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.
Features General Description
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 2 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Pin Assignment
( Top View )
SOT25
3
2
5
4
1IN
EN BP
OUT
Pin Description
Block Diagram
Current
Limit
Thermal
Shutdown
-
+
IN OUT
GND
1.08V
E rro r
Amp
Bandgap
Enable
BP
EN
Pin Name Description
IN Input Voltage
GND Ground
EN Enable Pin
BP Band-gap
OUT Output Voltage
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 3 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VCC Input Voltage +6 V
TOP Operating Junction Temperature Range -40 to +125 ºC
TST Storage Temperature Range -65 to +150 ºC
PD Power Dissipation, PD @ TA = 25ºC SOT25 250 mW
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VIN Input Voltage 2.7 5.5 V
IOUT Output Current 0 300 mA
TA Operating Ambient Temperature -40 85 °C
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 4 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Electrical Characteristics
TA = 25ºC, CIN = 1µF, COUT = 10µF, unless otherwise specified.
Symbol Parameter Conditions Min Typ. Max Unit
VDROP Dropout Voltage (Note 3) IL = 300mA - 400 500 mV
ILIMIT Current Limit (Note 4) VIN = 5V , VOUT = 0V 350 450 - mA
Ishort Short Circuit Current VOUT < 1.05V - 150 300 mA
ΔVLINE Line Regulation IOUT=1mA, VIN =( VOUT +1V )
to 5.5V - 0.1 0.3 %/V
ΔVLOAD Load Regulation (Note 5) IL = 1~300mA, VIN = 5V - 30 35 mV
ΔVOUT Output Voltage Accuracy IL = 1mA, VIN = 5V -2 - +2 %
Output Voltage Temperature
Coefficient (Note 6) - 50 150
PPM/
ºC
PSRR Ripple Rejection F = 100Hz,
CIN = 1μF, CO = 10uF,
IL = 100mA - 60 - dB
ISB Standby Current IL = 0mA, VIN = 5V, EN = 0V - - 5 μA
IQ Quiescent Current IL = 0mA, VIN = 5V, EN = 5V - 50 100 μA
IEN Enabl e Pin Current - - < 0.1 μA
VENON Enable Pin Voltage Output ON 1.5 - VIN V
VENOFF Output OFF 0 - 0.8 V
TDELAY Enable Delay Time CBP = 0.1μF, COUT = 1μF,
IOUT = 30mA - 8 - μS
θJA Thermal Resistance
Junction-to-Ambient SOT25 (Note 7) 163 OC/W
θJC Thermal Resistance
Junction-to-Case SOT25 (Note 7) 53 OC/W
Notes: 3. Dropout voltage is defined as the input to output differential voltage. Dropout is measured at constant junction temperature by using pulsed ON
time, and the criterion is VOUT inside target value ±2%. This test is skipped at the condition of VIN<3V.
4. Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.
5. Regulati on is measured at constant junction temperatur e by using pulsed testing with a low ON time.
6. Guaranteed by design.
7. Test conditions for SOT25: Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 5 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Typical Characteristics
AP131 PSRR vs. Frequency
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
10 100 1K 10K 100K 1M
Fre
q
uenc
y
(
Hz
)
PSRR (dB)
AP131 Vout vs. Load Current
3.02
3.025
3.03
3.035
3.04
3.045
3.05
3.055
3.06
3.065
3.07
3.075
3.08
3.085
3.09
3.095
0 30 60 90 120 150 180 210 240 270 300 330
Load Current
(
uA
)
Vout
AP131 GND Current vs. Input Voltage
0
5
10
15
20
25
30
35
40
45
50
55
00.511.522.533.544.555.56
Input Voltage (V)
GND Current (uA)
AP131 Dropout vs. Load
0
50
100
150
200
250
300
350
400
450
0 50 100 150 200 250 300
Load (Io) (mA)
Dropout (V)
V
OUT
=3.3V
Typical Application Circuit
IN OUT
GND
AP131
BP
EN
EN
VIN CIN
CBP
COUT
VOUT
ON
OFF
1uF
0.1uF 10uF
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 6 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Marking Information
(1) SOT25
1 2 3
5
7
4
XX YW X
XX : Identification code
W : Week : A~Z : 1~26 week;
X : a~z : Lead Free
( Top View )
Y : Year 0~9
a~z : 27~52 week; z represents
52 and 53 week
A~Z : Green
Part Number Package Identification Code
AP131-15W SOT25 DA
AP131-18W SOT25 DD
AP131-20W SOT25 DF
AP131-25W SOT25 DK
AP131-28W SOT25 DN
AP131-29W SOT25 DO
AP131-30W SOT25 DP
AP131-33W SOT25 DS
AP131-35W SOT25 DU
Package Information (All Dimensions in mm)
AP131
300mA LOW DROPOUT LINEAR REGULATOR WITH
SHUTDOWN
AP131 Rev. 7 7 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
IMPORTANT NOTICE
LIFE SU PPOR T
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products 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 our website, harmless against all damages.
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
