AAT3236
300mA CMOS High Performance LDO
General Description
The AAT3236 is a MicroPower low dropout (LDO)
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 (PSRR),
extended battery life, and small size are critical.
The AAT3236 features fast transient response and
low output self noise for powering sensitive RF cir-
cuitry. Other features include low quiescent cur-
rent, typically 100µA, and low dropout voltage, typ-
ically 300mV at full output load current. The device
has internal output short-circuit protection and ther-
mal 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 device reference
output to ground.
The AAT3236 is available in a Pb-free, space-sav-
ing SOT23-5 or SC70JW-8 package in nine facto-
ry-programmed voltages: 2.5V, 2.7V, 2.8V, 2.85V,
3.0V, 3.1V, 3.3V, 3.5V, or 3.6V.
Features
•
•
•
•
•
•
PowerLinear
™
•
•
•
•
•
•
•
•
500mA Peak Output Current
Low Dropout - Typically 300mV at 300mA
Guaranteed 300mA Output
High Accuracy: ±1.5%
100µA Quiescent Current
High Power Supply Ripple Rejection
— 70dB at 1kHz
— 50dB at 10kHz
Very Low Self Noise: 45µVrms
Noise Reduction Bypass Capacitor
Short-Circuit Protection
Over-Temperature Protection
Shutdown Mode for Longer Battery Life
Low Temperature Coefficient
Nine Factory-Programmed Output Voltages
SOT23 5-Pin or SC70JW 8-Pin Package
Applications
•
•
•
•
Cellular Phones
Notebook Computers
Personal Portable Electronics
Portable Communication Devices
Typical Application
V
IN
IN
V
OUT
AAT3236
OUT
BYP
ON/OFF
EN
GND
1μF
10nF
2.2μF
GND
GND
3236.2007.03.1.4
1
AAT3236
300mA CMOS High Performance LDO
Pin Descriptions
Pin #
SOT23-5
SC70JW-8
Symbol
IN
GND
EN
Function
Input voltage pin; should be decoupled with 1µF or greater
capacitor.
Ground connection pin.
Enable pin. When pulled low, the PMOS pass transistor turns
off and all internal circuitry enters low-power mode, consuming
less than 1µA. This pin should not be left floating.
Bypass capacitor connection; to improve AC ripple rejection,
connect a 10nF capacitor to GND. This will also provide a soft-
start function.
Output pin; should be decoupled with 2.2µF capacitor.
1
2
3
5, 6
8
7
4
1
BYP
5
2, 3, 4
OUT
Pin Configuration
SOT23-5
(Top View)
SC70JW-8
(Top View)
IN
GND
EN
1
5
OUT
2
3
4
BYP
BYP
OUT
OUT
OUT
1
2
3
4
8
7
6
5
GND
EN
IN
IN
2
3236.2007.03.1.4
AAT3236
300mA CMOS High Performance LDO
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ENIN(MAX)
I
OUT
T
J
Description
Input Voltage
Maximum EN to Input Voltage
DC Output Current
Operating Junction Temperature Range
Value
6
0.3
P
D
/(V
IN
- V
O
)
-40 to 150
Units
V
V
mA
°C
Thermal Information
2
Symbol
Θ
JA
P
D
Description
Maximum Thermal Resistance (SOT23-5, SC70JW-8)
Maximum Power Dissipation (SOT23-5, SC70JW-8)
Value
190
526
Units
°C/W
mW
Recommended Operating Conditions
Symbol
V
IN
T
Description
Input Voltage
Ambient Temperature Range
Rating
(V
OUT
+ 0.3) to 5.5
-40 to +85
Units
V
°C
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.
3236.2007.03.1.4
3
AAT3236
300mA CMOS High Performance LDO
Electrical Characteristics
V
IN
= V
OUT(NOM)
+ 1V, I
OUT
= 1mA, C
OUT
= 2.2µF, C
IN
= 1µF, C
BYP
= 10nF, T
A
= -40°C to +85°C, unless other-
wise noted. For typical values, T
A
= 25°C.
Symbol
V
OUT
I
OUT
V
DO
I
SC
I
Q
I
SD
ΔV
OUT
/
V
OUT
*ΔV
IN
Description
Output Voltage Tolerance
Output Current
Dropout Voltage
1
Short-Circuit Current
Ground Current
Shutdown Current
Line Regulation
Conditions
I
OUT
= 1mA to 300mA
Min
T
A
= 25°C
-1.5
T
A
= -40 to 85°C -2.5
300
Typ
Max
1.5
2.5
Units
%
mA
mV
mA
µA
µA
%/V
mV
mV
V
V
µA
dB
V
OUT
> 1.2V
I
OUT
= 300mA
V
OUT
< 0.4V
V
IN
= 5V, No Load, EN = V
IN
V
IN
= 5V, EN = 0V
V
IN
= V
OUT
+ 1 to 5.5V
300
600
100
500
150
1
0.07
ΔV
OUT
(line) Dynamic Line Regulation
ΔV
OUT
(load)
V
EN(L)
V
EN(H)
I
EN
PSRR
Dynamic Load Regulation
Enable Threshold Low
Enable Threshold High
Leakage Current Enable Pin
Power Supply Rejection Ratio
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Output Noise
Output Voltage Temperature
Coefficient
V
IN
= V
OUT
+ 1V to V
OUT
+ 2V,
I
OUT
= 150mA, T
R
/T
F
= 2µs
I
OUT
= 1mA to 150mA, T
R
<5µs
1.5
V
EN
= 5V
1kHz
I
OUT
= 10mA, C
BYP
= 10nF 10kHz
1MHz
1
30
0.6
1
70
50
47
150
10
45
22
T
SD
T
HYS
e
N
T
C
°C
°C
µV
RMS
ppm/°C
1. V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
4
3236.2007.03.1.4
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