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General Description
TM
AAT3232
300mA CMOS Low Drop Out Linear Regulator
Features
•
•
•
•
•
•
•
•
•
•
•
•
Low Dropout - 300mV (max) at 300mA
Guaranteed 300mA Output
High accuracy
30µA Quiescent Current
Current limit protection
Short circuit current fold back
Over-Temperature protection
Noise reduction bypass capacitor
Shutdown mode for longer battery life
Low Temperature coefficient
7 Factory programmed output voltages
SOT-23 5-pin package
The AAT3232 Low Dropout Linear Regulator is
ideal for portable applications where longer
battery life is critical. It features low quiescent
current (30µA typical) and low dropout voltage
(300mV max) at full output current. The device is
able to protect itself from short circuit conditions
with fold back current limiting. Thermal shutdown
is activated to prevent damage under extreme
conditions.
The AAT3232 also features a low-power
shutdown mode for longer battery life. A pin is
provided to improve PSRR performance, by
connecting an external capacitor from the
AAT3232’s reference output to ground.
The AAT3232 is available in a space saving 5-pin
SOT-23 in 7 factory programmed voltages of
2.5V, 2.7V, 2.8V, 3.0V, 3.3V, 3.5V and 3.8V.
Preliminary Information
Applications
•
•
•
•
Cellular Phones
Notebook Computers
Portable Communication Devices
Handheld Electronics
Typical Application
INPUT
V
IN
ENABLE
EN
GND
OUTPUT
AAT3232
OUT
BYP
C
IN
1nF
5.6µF ceramic or
10µF tantalum
Advanced Analogic Technologies, Inc.
1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086
(408)524-9684 Fax (408)524-9689
1-43
3232.2000.05.0.98
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Symbol
V
IN
I
OUT
T
J
Θ
JA
P
D
T
LEAD
TM
AAT3232
300mA CMOS Low Drop Out Linear Regulator
Absolute Maximum Ratings
(T
A
=25°C unless otherwise noted)
Description
Input Voltage
DC Output Current
Operating Junction Temperature Range
Thermal Resistance (SOT-23-5)
Maximum Power Dissipation (SOT-23-5)
Maximum Soldering Temperature (at leads, 10 sec)
Max
8
P
D
/(V
IN
-V
O
)
150
260
380
300
Units
V
mA
°C
°C/W
mW
°C
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at
conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one
time.
Recommended Operating Conditions
Symbol
V
IN
T
Description
Input Voltage
Ambient Temperature Range
Rating
(V
OUT
+0.3) to 7
Units
V
°C
-40 to +85
Electrical Characteristics
(T
J
=25°C unless otherwise noted)
Symbol
V
OUT
I
OUT
I
SC
I
Q
I
SD
∆V
OUT
/
V
OUT
∆V
OUT
/
V
OUT
V
DO
V
ENL
V
ENH
PSRR
T
SD
T
HYS
e
N
TC
Description
Output Voltage
Output Current
Short Circuit Current
Ground Current
Shutdown Current
Line Regulation
Load Regulation
Dropout Voltage
Enable Threshold Low
Enable Threshold High
Power Supply Rejection Ratio
Over Temp Shutdown Threshold
Over Temp Shutdown Hysteresis
Output Noise
Ouput Voltage Temp. Coeff.
1
Conditions
V
OUT
> 1.2V
V
OUT
< 0.4V
V
IN
= 5V, no load
V
IN
= 5V, EN = low
I
OUT
= 5mA, V
IN
= V
OUT
+ 1
to V
OUT
+ 2
I
OUT
= 1mA to 300mA
I
OUT
= 300mA
Min
-1.5
300
Typ
Max
1.5
300
50
1
0.1
1
300
V
IN
-0.5
Units
%
mA
mA
30
µA
µA
%
%
mV
V
V
dB
°C
°C
0.02
0.2
200
0.5
1 kHz
55
150
30
20
40
µV
RMS
ppm/°C
Note 1: V
DO
is defined as V
IN
- V
OUT
when V
OUT
is 98% of nominal.
Advanced Analogic Technologies, Inc.
1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086
(408)524-9684 Fax (408)524-9689
1-44
3232.2000.05.0.98
$1$/2*,&
7(&+
Typical Characteristics
TM
AAT3232
300mA CMOS Low Drop Out Linear Regulator
(Unless otherwise noted, V
IN
= V
OUT
+ 1V, T
A
= 25°C, C
NOISE
= 10nF, C
IN
= 2.0µF, C
OUT
= 5.6µF ceramic, I
OUT
= 100mA)
Output Voltage vs. Load Current
3.34
3.33
3.32
3.31
40
60
Ground Current vs. Input Voltage
Ta = -40°C
50
Ta = +125°C
Vout (V)
3.30
3.29
3.28
3.27
3.26
3.25
Ta = +25°C
Ignd (µA)
30
Ta = +25°C
20
Ta = -40°C
Ta = +125°C
10
0
0
2
4
6
8
Load Current (mA)
0
Step Load Transient Response
Line Voltage (V)
70
60
400
300
200
100
0
-100
-200
-300
-400
0
-500
100 200 300 400 500 600
6
5
4
3
2
1
0
-100
50
100
Iout (mA)
150
200
250
300
Vin (volts)
Line Transient Response
80
60
40
20
0
-20
-40
600
Output Voltage
(mV AC coupled)
50
40
30
20
10
0
-10
-20
-200 -100
0
100
200
300
400
500
Time (us)
Time (us)
Advanced Analogic Technologies, Inc.
1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086
(408)524-9684 Fax (408)524-9689
1-45
3232.2000.05.0.98
Output Voltage
(mV AC coupled)
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TM
AAT3232
300mA CMOS Low Drop Out Linear Regulator
Power Supply Rejection Ratio
80
Output Noise
10
60
50
40
30
20
10
0
1.E+01
100pF
None
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
1nF
Noise (uV / Root Hz)
Rejection Ratio (dB)
70
10nF
1
10nF
1nF
0.1
100pF
None
0.01
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Frequency (Hz)
Frequency (Hz)
Power-Up, Power-Down Response
6
5
Input
Turn On / Turn Off
12
10
8
6
4
2
0
100pF
4
2
1nF
0
-2
0
2
4
6
8
10
12
14
16
18
10nF
-2
-4
-6
Voltage (V)
4
3
2
1
0
-20
Output Voltage (V)
Output
6
-10
0
10
20
30
40
50
60
70
Time (ms)
Time (ms)
Advanced Analogic Technologies, Inc.
1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086
(408)524-9684 Fax (408)524-9689
1-46
3232.2000.05.0.98
Enable (V)
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Pin Descriptions
Pin #
1
2
3
4
5
TM
AAT3232
300mA CMOS Low Drop Out Linear Regulator
Symbol
V
IN
GND
EN
BYP
OUT
Function
Input voltage pin – should be decoupled with 1µF or greater capacitor.
Ground connection pin
Enable pin – pin is internally pulled high. When pulled low the PMOS pass transistor
turns off and the device enters low-power mode, consuming less than 1µA.
Bypass capacitor connection -- to improve AC ripple rejection, connect a 1nF
capacitor to GND. This will also provide a soft start function.
Output pin – should be decoupled with 2.2µF or greater output capacitor. See
Detailed Description section for further information.
Functional Block Diagram
V
IN
Over-Current
Protection
Over-Temp
Protection
OUT
EN
BYP
V
REF
GND
Advanced Analogic Technologies, Inc.
1250 Oakmead Pkwy, Suite 310, Sunnyvale, CA 94086
(408)524-9684 Fax (408)524-9689
1-47
3232.2000.05.0.98
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