AP131
300mA Low Dropout Linear Regulator with Shutdown
Features
- Input voltage range is up to 7V
- Dropout voltage 400mV at 300mA output current
- Guaranteed 300mA output current.
- Internal R
on
=1.5Ω PMOS draws no base current
- Low quiescent current 50
µ
A
- Output voltage 2% accuracy, and 1.5V to 5V with
0.1V step
- Active low shutdown function (EN pin).
- Fast transient response
- Good load regulation
- Current limit and thermal shutdown protection
- SOT89-5L and SOT23-5L packages
General Descriptions
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
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 application, for example, some battery
powered devices. The typical quiescent current is
approximately 50µA from zero to maximum load.
Due to internal flexible design, result in extensively
fixed output voltage versions and make 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
- Wireless Communication
- Battery Powered device
- CD-ROM, DVD, and LAN Card
- PC peripheral
Pin Assignments
(Top View)
EN
GND
IN
1
2
3
4 OUT
5
BP
Pin Descriptions
Name
IN
GND
EN
BP
OUT
Description
Input voltage
Ground
Enable pin
Bandgap
Output voltage
SOT89-5L
(Top View)
IN
GND
EN
1
2
3
4
BP
5
OUT
SOT23-5L
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.2 Oct 28, 2004
1/7
AP131
300mA Low Dropout Linear Regulator with Shutdown
Electrical Characteristics
T
A
=25ºC, C
IN
=1µF, C
OUT
=10µF, unless otherwise specified.
Symbol
V
DROP
I
LIMIT
∆V
LINE
∆V
LOAD
∆V
OUT
Parameter
Dropout voltage (Note 1)
Current Limit (Note 2)
Line regulation
Load regulation (Note 3)
Output voltage accuracy
Output voltage temperature
coefficient (Note 4)
Ripple Rejection
Standby current
Quiescent current
Enable pin current
Enable pin voltage
Enable delay time
Conditions
I
L
=300mA
V
IN
=5V, V
OUT
=0V
I
L
=1mA, V
IN
=5~7V
I
L
=1~300mA, V
IN
=5V
I
L
=1mA, V
IN
=5V
Min.
-
350
-
-
-2
-
Typ.
400
450
0.1
30
-
50
60
-
50
-
-
-
8
Max.
500
-
0.3
35
+2
150
-
5
100
< 0.1
V
IN
0.8
-
Unit
mV
mA
%/V
mV
%
PPM/ºC
dB
µA
µA
µA
V
V
µS
PSRR
I
SB
I
Q
I
EN
V
ENON
V
ENOFF
T
DELAY
F=100Hz,
C
IN
=1µF, C
O
=10uF,
I
L
=100mA
I
L
=0mA, V
IN
=5V, EN=0V
I
L
=0mA, V
IN
=5V, EN=5V
Output ON
Output OFF
C
BP
=0.1µF, C
OUT
=1µF,
I
OUT
=30mA
-
-
-
-
1.5
0
-
Note 1.
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 V
OUT
inside target value ±2%. This test is skipped at the condition of V
IN
<3V.
Note 2.
Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.
Note 3.
Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.
Note 4.
Guaranteed by design.
Typical Application Circuit
AP131
V
IN
C
IN
1uF
IN
GND
EN
OUT
BP
C
BP
0.1uF
ON
EN
OFF
V
OUT
C
OUT
10uF
Anachip Corp.
www.anachip.com.tw
3/7
Rev. 1.2
Oct 28, 2004
AP131
300mA Low Dropout Linear Regulator with Shutdown
Typical Characteristics
AP131 PSRR V.S. Frequency
AP131 GND Current V.S. Input Voltage
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
55
50
45
40
35
30
25
20
15
10
5
0
GND Current (uA)
10
100
1K
10K
100K
1M
PSRR (dB)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
Frequency (Hz)
Input Voltage (V)
PSRR V.S. Frequency
GND Current V.S. Input Voltage
3.095
3.09
3.085
3.08
3.075
3.07
3.065
3.06
3.055
3.05
3.045
3.04
3.035
3.03
3.025
3.02
0
AP131 Vout V.S. Load Current
AP131 Dropout V.S. Load
0.3
0.25
Dropout (V)
0.2
0.15
0.1
0.05
0
Vout (V)
30
60
Load Current (uA)
90 120 150 180 210 240 270 300 330
0
50
100
150
200
250
300
350
Load (Io) (mA)
Vout V.S. Load Current
Dropout V.S. Load
Anachip Corp.
www.anachip.com.tw
4/7
Rev. 1.2
Oct 28, 2004
PCB Design
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