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FAN1540 Datasheet

  • FAN1540

  • 1A/1.3A, LDO With Low Quiescent Current

  • 15頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN1539/FAN1540
1A/1.3A, LDO With Low Quiescent Current
Features
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Very Low Ground Current (I
GND
= 1mA)
Excellent Line Regulation
Excellent Load Regulation
Very Low Transient Overshoot
Stable with low ESR Output Capacitor (ESR = 0m鈩?
Thermal Shutdown
Current Limit
Output Options: 3.3V and 1.8V
Description
The FAN1539/FAN1540 series of high current LDO (1.0A
and 1.3A) has been developed for portable applications
where low quiescent current is an important requirement.
The device features excellent line and load transient response
which does not exceed 10% of nominal output value for full
operating temperature range even during power ON cycle
and short circuit removal. Internally trimmed, temperature
compensated bandgap reference guarantees 2.5% accuracy
for full range of input voltage, output current and tempera-
ture. Included on the chip are accurate current limit and ther-
mal shutdown protection. Device stability is achieved with
only two external low ESR ceramic capacitors.
The FAN1539/FAN1540 is available in thermally enhanced
3x3mm 6-lead MLP, 5x6mm 8-lead MLP package and
3-lead TO-252 packages. The 5x6mm MLP package version
features separate Kelvin sense pin for high precision applica-
tions.
Applications
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Disk Drive Circuits
Desktop Computers
Laptop, Notebook Computers
General purpose Three Terminal Regulator
Block Diagram
V
IN
V
OUT
BANDGAP
REFERENCE
CURRRENT
LIMIT
ERROR
AMPLIFIER
X
(Note1)
V
SENSE
(Note2)
SRART-UP
CIRCUIT
THERMAL
SHUTDOWN
GND
Notes:
1. No connection for FAN1540MMPX.
2. V
SEN
available for FAN1540MMPX.
REV. 1.0.8 3/22/04

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