AAT3239
500mA MicroPowerTM LDO
3239.2006.03.1.2
1
General Description
The AAT3239 MicroPower low dropout (LDO) linear
regulator is ideally suited for portable applications
where very fast transient response, extended battery
life, and small size are critical. The AAT3239 has
been specifically designed for high-speed turn-on
and turn-off performance, fast transient response,
good power supply rejection ratio (PSRR), and is
reasonably low noise, making it ideal for powering
sensitive circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70A, and low dropout voltage which is typically
less than 400mV at 300mA. The device is output
short-circuit protected and has a thermal shutdown
circuit for additional protection under extreme operat-
ing conditions.
The AAT3239 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise by connecting a small exter-
nal capacitor from the AAT3239's reference output to
ground.
The AAT3239 is available in a Pb-free, 8-pin
TSOPJW package in factory-programmed voltages.
Features
500mA Output Current
Low Dropout: 400mV at 300mA
High Accuracy: 2.0%
70A Quiescent Current
Fast Line and Load Transient Response
High-Speed Device Turn-On and Shutdown
High Power Supply Rejection Ratio
Low Self Noise
Short-Circuit Protection
Over-Temperature Protection
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
Noise Reduction Bypass Capacitor
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
TSOPJW 8-Pin Package
Applications
Cellular Phones
Digital Cameras
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
AAT3239
EN
IN
OUT
BYP
GND
ON/OFF
1F
10nF
2.2F
V
IN
GND
GND
V
OUT
PowerLinear
TM
AAT3239
500mA MicroPowerTM LDO
2
3239.2006.03.1.2
Pin Descriptions
Pin Configuration
TSOPJW-8
(Top View)
1
2
3
4
8
7
6
5
BYP
EN
OUT
IN
GND
GND
GND
GND
Pin #
Symbol
Function
1
BYP
Bypass capacitor connection; to improve AC ripple rejection, connect a 10nF
capacitor to GND. This will also provide a soft-start function.
2
EN
Enable pin; this pin should not be left floating. When pulled low, the PMOS
pass transistor turns off and all internal circuitry enters low-power mode, con-
suming less than 1A.
3
OUT
Output pin; should be decoupled with 2.2F ceramic capacitor.
4
IN
Input voltage pin; should be decoupled with 1F or greater capacitor.
5, 6, 7, 8
GND
Ground connection pin.
Absolute Maximum Ratings
1
Thermal Information
2
Recommended Operating Conditions
Symbol
Description
Rating
Units
V
IN
Input Voltage
4
(V
OUT
+ V
DO
) to 5.5
V
T
Ambient Temperature Range
-40 to +85
C
Symbol
Description
Rating
Units
JA
Maximum Thermal Resistance
90
C/W
P
D
Maximum Power Dissipation
3
(T
A
= 25C)
1.11
W
Symbol
Description
Value
Units
V
IN
Input Voltage
6
V
V
ENIN(MAX)
Maximum EN to Input Voltage
0.3
V
I
OUT
DC Output Current
P
D
/(V
IN
- V
O
)
mA
T
J
Operating Junction Temperature Range
-40 to 150
C
AAT3239
500mA MicroPowerTM LDO
3239.2006.03.1.2
3
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a demo board.
3. Derate 11.1mW/C above 25C.
4. To calculate minimum input voltage, use the following equation: V
IN(MIN)
= V
OUT(MAX)
+ V
DO(MAX)
as long as V
IN
2.5V.
Electrical Characteristics
1
V
IN
= V
OUT(NOM)
+ 1.2V for V
OUT
options greater than 1.5V. V
IN
= 2.5 for V
OUT
1.5V. I
OUT
= 1mA, C
OUT
= 2.2F,
C
IN
= 1F, T
A
= -40C to +85C, unless otherwise noted. Typical values are T
A
= 25C.
Symbol
Description
Conditions
Min Typ Max
Units
I
OUT
= 1mA to 300mA
T
A
= 25C
-1.5
1.5
V
OUT
Output Voltage Tolerance
T
A
= -40 to 85C -2.5
2.5
%
I
OUT
= 1mA to 500mA
T
A
= 25C
-2.0
2.0
T
A
= -40 to 85C -3.5
3.5
I
OUT
Output Current
V
OUT
> 1.2V
500
mA
V
DO
Dropout Voltage
2, 3
I
OUT
= 300mA
400 600
mV
I
OUT
= 500mA
0.8
1.2
V
I
SC
Short-Circuit Current
V
OUT
< 0.4V
600
mA
I
Q
Ground Current
V
IN
= 5V, No Load, EN = V
IN
70
125
A
I
SD
Shutdown Current
V
IN
= 5V, EN = 0V
1
A
V
OUT
/
Line Regulation
V
IN
= V
OUT
+ 1 to 5.0V
0.09
%/V
V
OUT
*
V
IN
V
OUT
(line)
Dynamic Line Regulation
V
IN
= V
OUT
+ 1V to V
OUT
+ 2V,
2.5
mV
I
OUT
= 500mA, T
R
/T
F
= 2s
V
OUT
(load) Dynamic Load Regulation
I
OUT
= 1mA to 300mA, T
R
<5s
100
mV
I
OUT
= 1mA to 500mA, T
R
<5s
120
t
ENDLY
Enable Delay Time
BYP = Open
15
s
V
EN(L)
Enable Threshold Low
0.6
V
V
EN(H)
Enable Threshold High
1.5
V
I
EN
Leakage Current on Enable Pin
V
EN
= 5V
1
A
1kHz
67
PSRR
Power Supply Rejection Ratio
I
OUT
= 10mA,
10kHz
47
dB
C
BYP
= 10nF
1MHz
45
T
SD
Over-Temperature Shutdown
145
C
Threshold
T
HYS
Over-Temperature Shutdown
12
C
Hysteresis
e
N
Output Noise
Noise Power BW = 300Hz to 50kHz
50
Vrms
TC
Output Voltage Temperature
22
ppm/C
Coefficient
AAT3239
500mA MicroPowerTM LDO
4
3239.2006.03.1.2
1. The AAT3239 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
2. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
3. For V
OUT
< 2.1V, V
DO
= 2.5V - V
OUT
.
AAT3239
500mA MicroPowerTM LDO
3239.2006.03.1.2
5
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25C.
Output Voltage vs. Temperature
1.196
1.197
1.198
1.199
1.200
1.201
1.202
1.203
-40 -30 -20 -10 0
10 20 30
40
50 60
70 80 90 100
Temperature (
C)
Output Voltage (V)
Quiescent Current vs. Temperature
0
10
20
30
40
50
60
70
80
90
100
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (
C)
Quiescent Current (
A)
Ground Current vs. Input Voltage
Input Voltage (V)
Ground Current (
A)
0
10
20
30
40
50
60
70
80
90
2
2.5
3
3.5
4
4.5
5
I
OUT
=
0mA
I
OUT
=
10mA
I
OUT
=
50mA
I
OUT
=
150mA
I
OUT
=
300mA
I
OUT
=
500mA
Dropout Voltage vs. Output Current
Output Current (mA)
Dropout Voltage (mV)
0
100
200
300
400
500
600
700
800
900
0
50
100
150
200
250
300
350
400
450
500
85
C
25
C
-40
C
Dropout Characteristics
Input Voltage (V)
Output Voltage (V)
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
3.20
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
I
OUT
= 500mA
I
OUT
= 300mA
I
OUT
= 0mA
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 100mA
Dropout Voltage vs. Temperature
Temperature (
C)
Dropout Voltage (mV)
0
60
120
180
240
300
360
420
480
540
600
660
720
780
840
900
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
I
L
= 500mA
I
L
= 400mA
I
L
= 300mA
I
L
= 150mA
I
L
= 100mA
I
L
= 50mA
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