AP139
300mA Low-Noise CMOS LDO
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.1.1 Jun 02, 2006
1/8
Features
- Very low dropout voltage
- Low current consumption: Typ.45A, Max. 60A
- Output voltage: 1.5V,1.8V,2.0V, 2.5V, 2.8V, 3.0V
3.3V, and 3.5V
- Guaranteed 300mA output
- Input range up to 7.0V
- Thermal shutdown
- Current limiting
- Stability with low ESR capacitors
- Low temperature coefficient
- Pb-free package: SOT23-5L,TSOT23-5L
Applications
- Battery-powered devices
- Personal communication devices
- Home electric/electronic appliances
- PC peripherals
General Descriptions
The AP139 is a positive voltage linear regulator
utilizing CMOS technology. The features that
include low quiescent current (45A 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 and TSOT23-5L 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 10nF
capacitor is necessary to be placed in between
Bypass and Ground.
The AP139 is stable with a low ESR output
capacitor of 1.0F or greater.
Pin Assignments
1
3
2
5
4
BYP
V
IN
EN
GND
V
OUT
AP139
SOT23-5/TSOT23-5
(Top View)
Pin Descriptions
Pin
Name
Pin
No.
Function
V
IN
1
Power
Supply
GND 2 Ground
EN 3
Enable
Pin
BYP 4 Bypass
Signal
Pin
V
OUT
5 Output
Ordering Information
AP139
XX X X
W : SOT23-5L
TW:TSOT23-5L
Output voltage
Package
15: 1.5V
18: 1.8V
20: 2.0V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
35: 3.5V
Blank: Tube
A: Taping
Packing
AP139
300mA Low-Noise CMOS LDO
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jun 02, 2006
2/8
Block Diagram
Current
Limit
Thermal
Shutdown
AMP
+
-
Vref
BYP
EN
1uA
V
OUT
GND
V
IN
R1
R2
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
IN
Input
Voltage
+7
V
I
OUT
Output
Current
P
D
/ (V
IN
-V
O
) mA
V
OUT
Output Voltage
GND - 0.3 to V
IN
+ 0.3
V
ESD
Classification
B
T
A
Ambient Temperature Range
-40 to +85
C
T
J
Junction Temperature Range
-40 to +125
C
Thermal Information
Symbol
Parameter
Maximum
Unit
jc
Thermal
Resistance
SOT23-5L 160 C/W
P
D
Internal Power Dissipation (
T=100 C) SOT23-5L 250 mW
T
J
Maximum
Junction
Temperature
150
C
T
Lead
Maximum Lead Temperature (10 sec)
300
C
AP139
300mA Low-Noise CMOS LDO
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jun 02, 2006
3/8
Electrical Characteristics
(T
A
=+25C, unless otherwise noted.)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
IN
Input
Voltage
Note 1
- 7 V
I
Q
Quiescent
Current
I
O
=0mA -
45
60
A
I
STB
Standby
Current
V
IN
=5.0V, V
OUT
=0V, V
EN
< V
EL
-
2.0
3.0
A
Output Voltage Accuracy I
O
=1mA, V
IN
=5V -2
-
2
%
V
OUT
V
OUT
Temperature
Coefficient
-
50
-
ppm/
o
C
V
O
=1.5V
- - 1.5
V
O
=1.8V
-
-
1.2
V
O
=2V
-
-
1
V
O
=2.5V
-
-
0.6
V
DROPOUT
Dropout Voltage
I
O
=1mA to 300mA,
V
OUT
=V
O(NOM)
-1.5%
V
O
2.8V
- -
0.45
V
I
OUT
Output
Current
300 -
-
mA
I
LIMIT
Current
Limit
V
OUT
> 1.05V
300
450
-
mA
I
short
Short
Circuit
Current Vcc=5V,Vout<1.05V
- 150 300 mA
V
LINE
Line Regulation
I
OUT
=5mA, V
IN
=5~7V -
0.1
0.3
%
V
LOAD
Load Regulation
I
O
=1mA to 300mA, V
IN
=5V -
0.3
1
%
f=1KHz -
60
-
f=10KHz -
50
-
PSRR Power Supply Rejection
I
O
=100mA,
C
O
=2.2F ceramic
f=100KHz - 40 -
dB
f=1KHz -
75
-
f=10KHz -
55
-
PSRR Power Supply Rejection
I
O
=100mA,
C
O
=2.2F ceramic,
C
BYP
=20nF
f=100KHz - 30 -
dB
V
EH
Output
ON 1.7
-
-
V
V
EL
EN Input Threshold
Output OFF
-
-
0.8
V
I
EN
Enable Pin Current
-
-
<0.1
A
OTS
Over Temperature
Shutdown
- 130 -
o
C
OTH
Over Temperature
Hysteresis
-
20
-
o
C
Note 1. : V
IN(MIN)
=V
OUT
+V
DROPOUT
Typical Application
AP139
BYP
EN
V
OUT
GND
V
IN
C1
1uF
C2
10nF
C3
1uF
IN
OUT
AP139
300mA Low-Noise CMOS LDO
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jun 02, 2006
4/8
Typical Performance Characteristics
0
10
20
30
40
50
60
70
80
90
100
3.5
4
4.5
5
5.5
6
6.5
7
Vcc Vs Quiescent Current
Vcc (V)
Qu
ie
s
c
en
t
C
u
rrent
(
A)
TA=25
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.5
1.8
2
2.5
2.8
3
3.3
3.5
Dr
op
ou
t Vo
lta
g
e
(
V
)
Vout (V)
Vout Vs Dropout Voltage
Io=300mA
Io=200mA
Io=100mA
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.0E+00
1.0E+01 1.0E+02
1.0E+03 1.0E+04
1.0E+05 1.0E+06
Power Supply Rejection Ratio
PSRR
(dB)
Frequency (Hz)
BP=1nF
BP=5nF
BP=10nF
BP=20nF
Iout=100mA
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.0E+00 1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+05 1.0E+06
Power Supply Rejection Ratio
PS
RR
(
d
B
)
Frequency (Hz)
100mA
10mA
1mA
BP=10nF
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1.0E+00 1.0E+01
1.0E+02 1.0E+03
1.0E+04 1.0E+05 1.0E+06
Power Supply Rejection Ratio
PS
RR
(
d
B)
Frequency (Hz)
100mA
10mA
1mA
BP=0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1.5
1.8
2
2.5
2.8
3
3.3
3.5
Cu
rre
n
t
L
i
m
i
t
(A)
Vout Vs Current Limit
Vcc=5V
Vout (V)
AP139
300mA Low-Noise CMOS LDO
Anachip Corp.
www.anachip.com.tw Rev.1.1 Jun 02, 2006
5/8
Typical Performance Characteristics (Continued)
0
50
100
150
200
250
300
350
400
3.5
4
4.5
5
5.5
6
6.5
7
Vcc Vs Short Current
Vcc (V)
S
h
o
r
t
C
u
r
r
e
n
t (
m
A
)
Top to bottom
Vout=1.5V
Vout=1.8V
Vout=2.5V
Vout=3.3V
Function Description
The AP139 of CMOS regulators contain a PMOS
pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown.
The P-channel pass transistor receives data from
the error amplifier, over-current protection, and
thermal protection circuits. During normal operation,
the error amplifier compares the output voltage to a
precision reference. Over-current and thermal
shutdown circuits become active when the junction
temperature exceeds 130
o
C, or the current exceeds
300mA. During thermal shutdown, the output
voltage remains low. Normal operation is restored
when the junction temperature drops below 110
o
C.
The AP139 switches from voltage mode to current
mode when the load exceeds the rated output
current. This prevents over-stress.
Enable
The enable pin normally floats high. When actively,
pulled low, the PMOS pass transistor shut off, and
all internal circuits are powered down. In this state,
the quiescent current is less than 2A. This pin
behaves much like an electronic switch.
External Capacitor
The AP139 is stable with a low ESR output
capacitor to ground of 1.0F or greater. It can keep
stable even with higher ESR capacitors. A second
capacitor is recommended between the input and
ground to stabilize VIN. The input capacitor should
be larger than 0.1F to have a beneficial effect. All
capacitors should be placed in close proximity to
the pins. A "quiet" ground termination is desirable.
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