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PDF AAT3239 Data sheet ( Hoja de datos )
| Número de pieza | AAT3239 | |
| Descripción | 500mA MicroPower LDO | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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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 70µA, 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.
AAT3239www.DataSheet4U.com
500mA MicroPower™ LDO
Features
PowerLinear™
• 500mA Output Current
• Low Dropout: 400mV at 300mA
• High Accuracy: ±2.0%
• 70µA 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
VIN
IN OUT
AAT3239
ON/OFF EN
BYP
GND
1µF 10nF
GND
VOUT
2.2µF
GND
3239.2006.03.1.2
1
1 page  
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Dropout Voltage vs. Temperature
900
840
780
IL = 500mA
IL = 400mA
720
660
600
540 IL = 300mA
480
420
360
300
240
IL = 150mA
IL = 100mA
IL = 50mA
180
120
60
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120
Temperature (°C)
AAT3239www.DataSheet4U.com
500mA MicroPower™ LDO
Dropout Characteristics
3.20
3.00 IOUT = 0mA
2.80
2.60
2.40
IOUT = 150mA
IOUT = 500mA
2.20 IOUT = 300mA
2.00 IOUT = 100mA
1.80 IOUT = 50mA
1.60 IOUT = 10mA
1.40
2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70
Input Voltage (V)
Dropout Voltage vs. Output Current
900
800
700
600
500
400
300
200
100
0
0
85°C
25°C
-40°C
50 100 150 200 250 300 350 400 450 500
Output Current (mA)
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)
3239.2006.03.1.2
Ground Current vs. Input Voltage
90
80
70
60
50 IOUT = 500mA
40
30 IOUT = 0mA
20 IOUT = 10mA
IOUT = 300mA
IOUT = 150mA
10 IOUT = 50mA
0
2 2.5 3 3.5 4
4.5
Input Voltage (V)
5
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)
5
5 Page 
diode. Conditions where VOUT might exceed VIN
should be avoided since this would forward bias
the internal parasitic diode and allow excessive
current flow into the VOUT pin, possibly damaging
the LDO regulator.
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.
Thermal Considerations and High
Output Current Applications
The AAT3239 is designed to deliver a continuous
output load current of 500mA under normal opera-
tions. The short-circuit current limit is greater than
500mA, typically active at 600mA.
The limiting characteristics for the maximum output
load current safe operating area is essentially pack-
age power dissipation, the internal preset thermal
limit of the device, and the input-to-output voltage
drop across the AAT3239. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the LDO reg-
ulator is mounted on a printed circuit board utilizing
the minimum recommended footprint as stated in
the layout considerations section of this document.
At any given ambient temperature (TA), the maxi-
mum package power dissipation can be determined
by the following equation:
PD(MAX)
=
TJ(MAX) -
θJA
TA
AAT3239www.DataSheet4U.com
500mA MicroPower™ LDO
Constants for the AAT3239 are TJ(MAX), the maxi-
mum junction temperature for the device which is
125°C, and TJA = 90°C/W, the package thermal
resistance. Typically, maximum conditions are calcu-
lated at the maximum operating temperature of TA =
85°C and under normal ambient conditions where
TA = 25°C. Given TA = 85°C, the maximum package
power dissipation is 444mW. At TA = 25°C, the max-
imum package power dissipation is 1.11W.
The maximum continuous output current for the
AAT3239 is a function of the package power dissi-
pation and the input-to-output voltage drop across
the LDO regulator. Refer to the following simple
equation:
IOUT(MAX) <
PD(MAX)
VIN - VOUT
For example, if VIN = 4.2V, VOUT = 1.8V, and TA =
25°C, IOUT(MAX) < 463mA. If the output load current
were to exceed 463mA or if the ambient tempera-
ture were to increase, the internal die temperature
would increase. If the condition remained constant,
the LDO regulator thermal protection circuit would
activate.
To determine the maximum output current for a
given output voltage, refer to the following equa-
tion. This calculation accounts for the total power
dissipation of the LDO regulator, including that
caused by ground current.
PD(MAX) = (VIN - VOUT)IOUT + (VIN x IGND)
This formula can be solved for IOUT to determine the
maximum output current.
IOUT =
PD(MAX) - (VIN × IGND)
VIN - VOUT
3239.2006.03.1.2
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT3239.PDF ] | |
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