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PDF AAT3238IJS-1.8-T1 Data sheet ( Hoja de datos )
| Número de pieza | AAT3238IJS-1.8-T1 | |
| Descripción | 300mA MicroPower High Performance LDO | |
| Fabricantes | ETC | |
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AAT3238
300mA MicroPower™ High Performance LDO
General Description
The AAT3238 MicroPower™ Low Dropout Linear
Regulator is ideally suited for portable applications
where very fast transient response, extended battery
life and small size are critical. The AAT3238 has
been specifically designed for high speed turn on and
turn off performance, fast transient response, good
power supply ripple rejection (PSRR) and is reason-
ably low noise, making it ideal for powering sensitive
circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 400mV at the maximum output current level
of 300mA. The device is output short circuit protect-
ed and has a thermal shutdown circuit for additional
protection under extreme operating conditions.
The AAT3238 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 AAT3238's reference output to
ground.
The AAT3238 is available in a space saving 6-pin
SOT23 or 8-pin SC70JW package in 14 factory pro-
grammed voltages of 1.2V, 1.5V, 1.6V, 1.8V, 1.85V,
2.0V, 2.3V, 2.5V, 2.7V, 2.8V, 2.85V, 3.0V, 3.3V or
3.5V.
Features
PowerLinear™
• Low Dropout - 400mV at 300mA
• Guaranteed 300mA Output
• High accuracy ±1.5%
• 70µA Quiescent Current
• Fast line and load transient response
• High speed device turn-on and shutdown
• High Power Supply Ripple Rejection
• Low self noise
• Short circuit protection
• Over-Temperature protection
• Uses Low ESR ceramic capacitors
• Noise reduction bypass capacitor
• Shutdown mode for longer battery life
• Low temperature coefficient
• 14 Factory programmed output voltages
• SOT23 6-pin or SC70JW 8-pin package
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Personal Portable Electronics
• Digital Cameras
Typical Application
VIN
IN OUT
AAT3238
VOUT
ON/OFF
EN
BYP
GND
1µF
10nF
2.2µF
GND
GND
3238.2004.01.0.94
1
1 page  
AAT3238
300mA MicroPower™ High Performance LDO
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Dropout Voltage vs. Temperature
540
480 IL = 300mA
420
360
300
240 IL = 150mA
180
120
IL = 100mA
60
0
-40 -30 -20 -10 0
IL = 50mA
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
Dropout Characteristics
3.20
3.00 IOUT = 0mA
2.80
2.60 IOUT = 300mA
IOUT = 150mA
2.40 IOUT = 100mA
2.20 IOUT = 10mA IOUT = 50mA
2.00
2.70 2.80 2.90 3.00 3.10 3.20 3.30
VIN (V)
Dropout Voltage vs. Output Current
500
450
400
350
300
250
200
150
100
50
0
0
85°C
25°C
-40°C
50 100 150 200 250 300
Output Current (mA)
Ground Current vs. Input Voltage
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
IOUT=300mA
IOUT=150mA
IOUT=0mA
IOUT=50mA
IOUT=10mA
0.00
2 2.5 3 3.5 4
VIN (V)
4.5
5
Quiescent Current vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
Output Voltage vs. Temperature
1.203
1.202
1.201
1.200
1.199
1.198
1.197
1.196
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature (°C)
3238.2004.01.0.94
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5 Page 
AAT3238
300mA MicroPower™ High Performance LDO
Applications Information
In applications where there is a possibility of VOUT
exceeding VIN for brief amounts of time during nor-
mal operation, the use of a larger value CIN capaci-
tor is highly recommended. A larger value of CIN
with respect to COUT will effect a slower CIN decay
rate during shutdown, thus preventing VOUT from
exceeding VIN. In applications where there is a
greater danger of VOUT exceeding VIN for extended
periods of time, it is recommended to place a
Schottky diode across VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky
diode forward voltage should be less than 0.45 volts.
3238.2004.01.0.94
11
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| PDF Descargar | [ Datasheet AAT3238IJS-1.8-T1.PDF ] | |
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