AP138
300mA Low-Noise CMOS LDO
Features
- Very low dropout voltage
- Low current consumption: Typ.30µA, Max. 35µA
- Output voltage: 1.8V, 2.5V, 2.8V, 3.0V and 3.3V
- High accuracy output voltage:
±1.5%
- Guaranteed 300mA output
- Input range up to 7.0V
- Thermal shutdown
- Current limiting
- Stability with low ESR capacitors
- Factory pre-set output voltages
- Low temperature coefficient
-
Pb-free
package: SOT23-5L
General Descriptions
The AP138 is a positive voltage linear regulator
utilizing CMOS technology. The features that
include low quiescent current (30µA typ.), low
dropout voltage, and high output voltage accuracy,
make it ideal for battery applications. EN input
connected to CMOS has low bias current. The
space-saving SOT23-5L package is attractive for
“Pocket” and “Hand Held” applications.
This rugged device has both thermal shutdown, and
current limit protections to prevent device failure
under the “Worst” operating conditions.
In a low noise, regulated supply application, a
1000pF capacitor is necessary to be placed in
between Bypass and Ground.
The AP138 is stable with a low ESR output
capacitor of 1.0µF or greater.
Applications
- Battery-powered devices
- Personal communication devices
- Home electric/electronic appliances
- PC peripherals
Pin Assignments
(Top View)
Pin Descriptions
BYP
4
V
OUT
5
AP138
Pin
Name
V
IN
GND
EN
BYP
V
OUT
Pin
No.
1
2
3
4
5
Function
Power Supply
Ground
Enable Pin
Bypass Signal Pin
Output
1
2
3
V
IN
GND EN
SOT23-5
Ordering Information
AP138 XX X X
Output voltage
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
Package
W : SOT23-5L
Packing
Blank: Tube
A: Taping
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. 1.0 Oct 29, 2004
1/7
AP138
300mA Low-Noise CMOS LDO
Electrical Characteristics
(T
A
=+25ºC, unless otherwise noted.)
Symbol
Parameter
Test Conditions
V
IN
Input Voltage
V
OUT
Output Voltage Accuracy I
O
=1mA to 300mA
1.2V<V
O(NOM)
≤
2.0V
I
O
=1mA to 300mA,
V
DROPOUT
Dropout Voltage
2.0V<V
O(NOM)
V
OUT
=V
O(NOM)
-1.5%
≤
2.5V
2.5V<V
O(NOM)
I
OUT
Output Current
V
OUT
> 1.2V
I
LIMIT
Current Limit
V
OUT
> 1.2V
I
Q
Quiescent Current
I
O
=0mA
I
GND
Ground Pin Current
I
O
=1mA to 300mA
REG
LINE
Line Regulation
I
OUT
=5mA, V
IN
=V
OUT
+1 to V
OUT
+2
REG
LOAD
Load Regulation
I
O
=1mA to 300mA
Over Temperature
OTS
Shutdown
Over Temperature
OTH
Hysteresis
V
OUT
Temperature
TC
Coefficient
f=1KHz
I
O
=100mA,
PSRR Power Supply Rejection
f=10KHz
C
O
=2.2µF ceramic
f=100KHz
f=1KHz
I
O
=100mA,
PSRR Power Supply Rejection C
O
=2.2µF ceramic,
f=10KHz
C
BYP
=0.01µF
f=100KHz
C
O
=2.2uF
f=10Hz to 100kHz,
eN
Output Voltage Noise
I
O
=10mA, C
BYP
=0µF
C
O
=100uF
C
O
=2.2uF
f=10Hz to 100kHz,
eN
Output Voltage Noise
I
O
=10mA, C
BYP
=0.01µF C
O
=100uF
Shutdown Supply
I
SD
V
IN
=5.0V, V
OUT
=0V, V
EN
< V
EL
Current
I
EH
V
EN
=V
IN
, V
IN
=2.6V to 7V
EN Input Bias Current
I
EL
V
EN
=0V, V
IN
=2.6V to 7V
V
EH
V
IN
=2.6V to 7V
EN Input Threshold
V
EL
V
IN
=2.6V to 7V
Note 1. : V
IN(MIN)
=V
OUT
+V
DROPOUT
Min.
Note 1
-1.5
-
-
-
300
300
-
-
-0.1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
0
Typ.
-
-
-
-
-
-
450
30
30
0.02
0.2
150
30
40
60
50
40
75
55
30
30
20
30
20
2.0
-
2.0
-
-
Max.
7
1.5
1300
800
300
-
-
35
50
0.1
1
-
-
-
-
-
-
-
-
-
-
-
-
-
3.0
0.1
3.0
V
IN
0.4
Unit
V
%
mV
mA
mA
µA
µA
%
%
o
C
C
o
ppm/
o
C
dB
dB
µVrms
µVrms
µA
µA
µA
V
V
Typical Application
IN
V
IN
AP138
BYP
C1
1uF
C2
1nF
GND
EN
C3
1uF
V
OUT
OUT
Anachip Corp.
www.anachip.com.tw
3/7
Rev. 1.0
Oct 29, 2004
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