AAT3236
300mA CMOS High Performance LDO
Typical Application
AAT3236
IN
EN
BYP
V
IN
V
OUT
GND
GND
GND
OUT
ON/OFF
2.2
F
10nF
1
F
Preliminary
Information
3236.2001.11.0.9
1
PowerLinear
TM
General Description
The AAT3236 is a MicroPowerTM Low Dropout
Linear Regulator designed to deliver a continuous
300mA output load current and is capable of han-
dling short duration current peaks up to 500mA.
With a very small footprint SOT23-5 package it is
ideally suited for portable applications where low
noise, high power supply ripple rejection, extended
battery life and small size are critical. The AAT3236
features fast transient response and low output self
noise for powering sensitive RF circuitry. Other fea-
tures include low quiescent current, typically
100A, and low dropout voltage, typically 300mV at
full output load current. The device has internal out-
put short circuit protection and thermal shutdown to
prevent damage under extreme conditions.
The AAT3236 also features a low-power shutdown
mode for longer battery life. A bypass pin is pro-
vided to improve PSRR performance by connect-
ing an external capacitor from the AAT3236's refer-
ence output to ground.
The AAT3236 is available in a space saving
SOT23-5 or SC70JW-8 package in 7 factory pro-
grammed voltages of 2.5V, 2.7V, 2.8V, 2.85V, 3.0V,
3.3V, or 3.5V.
Features
500mA Peak Output Current
Low Dropout - Typically 300mV at 300mA
Guaranteed 300mA Output
High accuracy 1.5%
100A Quiescent Current
High Power Supply Ripple Rejection
70 dB at 1kHz
50 dB at 10kHz
Very low self noise 45Vrms/rtHz
Noise reduction bypass capacitor
Short circuit protection
Over-Temperature protection
Shutdown mode for longer battery life
Low temperature coefficient
7 Factory programmed output voltages
SOT-23 5-pin or SC70JW 8-pin package
Applications
Cellular Phones
Notebook Computers
Portable Communication Devices
Personal Portable Electronics
Pin Descriptions
Pin Configuration
SOT-23-5
SC70JW-8
(Top View)
(Top View)
OUT
OUT
OUT
1
2
GND
EN
IN
IN
BYP
1
2
3
4
8
7
6
5
1
2
3
BYP
EN
OUT
4
5
GND
IN
Pin #
Symbol
Function
SOT23-5
SC70JW-8
1
5, 6
IN
Input voltage pin - should be decoupled with 1F or greater
capacitor.
2
8
GND
Ground connection pin
3
7
EN
Enable pin - this pin is internally pulled high. When pulled low
the PMOS pass transistor turns off and all internal circuitry
enters low-power mode, consuming less than 1A.
4
1
BYP
Bypass capacitor connection - to improve AC ripple rejection,
connect a 10nF capacitor to GND. This will also provide a soft
start function.
5
2, 3, 4
OUT
Output pin - should be decoupled with 2.2F capacitor.
AAT3236
300mA CMOS High Performance LDO
2
3236.2001.11.0.9
Absolute Maximum Ratings
(T
A
=25C unless otherwise noted)
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one time.
Thermal Information
Note 1: Mounted on a demo board.
Recommended Operating Conditions
Electrical Characteristics
(V
IN
=V
OUT(NOM)
+1V, I
OUT
=1mA, C
OUT
= 2.2F, C
IN
= 1F, C
BYP
= 10nF,
T
A
= -40 to 85C unless otherwise noted. For typical values T
A
=25C)
Note 2: V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
Symbol
Description
Conditions
Min Typ Max
Units
V
OUT
Output Voltage Tolerance
I
OUT
= 1mA to 300mA
T
A
=25C
-1.5
1.5
%
T
A
=-40 to 85C
-2.5
2.5
%
I
OUT
Output Current
V
OUT
> 1.2V
300
mA
V
DO
Dropout Voltage
2
I
OUT
= 300mA
300
500
mV
I
SC
Short Circuit Current
V
OUT
< 0.4V
600
mA
I
Q
Ground Current
V
IN
= 5V, no load,EN = V
IN
100
150
A
I
SD
Shutdown Current
V
IN
= 5V, EN = 0V
1
A
V
OUT
/
Line Regulation
V
IN
= V
OUT
+ 1 to 5.5V
0.07
%/V
V
OUT
*
V
IN
V
OUT
(line)
Dynamic Line Regulation
V
IN
=V
OUT
+1V to V
OUT
+2V,
1
mV
I
OUT
=150mA, T
R
/T
F
=2s
V
OUT
(load) Dynamic Load Regulation
I
OUT
= 1mA to 150mA, T
R
<5s
30
mV
V
EN(L)
Enable Threshold Low
0.6
V
V
EN(H)
Enable Threshold High
1.5
V
I
EN
Leakage Current Enable Pin
V
EN
=5V
1
A
1 kHz
70
PSRR
Power Supply Rejection Ratio
I
OUT
= 10mA, C
BYP
= 10nF
10kHz
50
dB
1MHz
47
T
SD
Over Temp Shutdown Threshold
150
C
T
HYS
Over Temp Shutdown Hysteresis
10
C
e
N
Output Noise
Noise Power BW= 300Hz to 50KHz
45
V
RMS
/rtHz
T
C
Output Voltage Temp. Coeff.
22
ppm/C
Symbol
Description
Rating
Units
V
IN
Input Voltage
(V
OUT
+0.3) to 5.5
V
T
Ambient Temperature Range
-40 to +85
C
Symbol
Description
Rating
Units
JA
Maximum Thermal Resistance
1
(SOT23-5, SC70JW-8)
190
C/W
P
D
Maximum Power Dissipation
1
(SOT23-5, SC70JW-8)
526
mW
Symbol
Description
Value
Units
V
IN
Input Voltage
6
V
I
OUT
DC Output Current
P
D
/(V
IN
-V
O
)
mA
T
J
Operating Junction Temperature Range
-40 to 150
C
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec)
300
C
AAT3236
300mA CMOS High Performance LDO
3236.2001.11.0.9
3
Typical Characteristics
Output Voltage vs. Temperature
3.007
3.008
3.009
3.01
3.011
3.012
3.013
3.014
-50
0
50
100
150
Temperature (
C)
Output Voltage
Dropout Voltage vs. I
OUT
0
50
100
150
200
250
300
350
0
50
100
150
200
250
300
Output Current (mA)
Dropout Voltage (mV)
85 C
25 C
-40 C
Ground Current vs. Input Voltage
0
20
40
60
80
100
120
2
3
4
5
V
IN
I
GND
(
A)
V
OUT
=3.0V
I
OUT
=50mA
I
OUT
=0
I
OUT
=150mA
I
OUT
=300mA
Ground Current vs. Temperature
80
85
90
95
100
105
-50
0
50
100
150
Temperature (
C)
Ignd (
A)
Dropout Characteristics
2.7
2.8
2.9
3.0
3.1
2.9
3.0
3.1
3.2
3.3
Vin
Vout
I
OUT
=0mA
I
OUT
=50mA
I
OUT
=10mA
I
OUT
=100mA
I
OUT
=150mA
I
OUT
=300mA
Dropout Voltage vs. Temperature
0
50
100
150
200
250
300
350
400
-40
-20
0
20
40
60
80
100
120
Temperature (
C)
Dropout Voltage (mV)
I
L
=300mA
I
L
=150mA
I
L
=50mA
I
L
=100mA
AAT3236
300mA CMOS High Performance LDO
4
3236.2001.11.0.9
Power Supply Rejection Ratio
vs. Frequency
30
40
50
60
70
80
90
10
100
1k
10k
100k
1m
10m
Frequency (Hz)
PSRR (dB)
10
F
4.7
F
2.2
F
1.0
F
Short Circuit Current
0
0.2
0.4
0.6
0.8
1
1.2
10ms/div
Isc(A)
Load Transient Response
2.80
2.85
2.90
2.95
3.00
3.05
3.10
100
S/div
V
OUT
0
200
400
600
800
1000
1200
I
OUT
(mA)
Line Transient Response
2.90
2.95
3.00
3.05
3.10
3.15
3.20
5
s/div
V
OUT
0
1
2
3
4
5
6
V
IN
On/Off Transient Response
C
BYP
=10nF
5ms/div
10mA
150mA
300mA
EN (2V/div)
V
OUT
(1V/div)
On/Off Transient Response
No C
BYP
Capacitor
100
s/div
10mA
300mA
150mA
EN (2v/div)
V
OUT
(1v/div)
AAT3236
300mA CMOS High Performance LDO
3236.2001.11.0.9
5
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