參數(shù)資料
型號: FAN2503
廠商: Fairchild Semiconductor Corporation
元件分類: 基準(zhǔn)電壓源/電流源
英文描述: 150 mA CMOS LDO Regulators
中文描述: 一百五十毫安的CMOS LDO穩(wěn)壓器
文件頁數(shù): 2/10頁
文件大?。?/td> 255K
代理商: FAN2503
PRODUCT SPECIFICATION
FAN2502/FAN2503
2
REV. 1.1.7 2/14/03
Pin Assignments
Pin Descriptions
Pin No.
1.
2.
3.
4.
5.
FAN2502
V
IN
GND
EN
ADJ
V
OUT
FAN2502-XX
V
IN
GND
EN
BYP
V
OUT
FAN2503-XX
V
IN
GND
EN
ERR
V
OUT
Pin Name
ADJ
Pin No.
4
Type
Input
Pin Function Description
FAN2502 Adjust.
determines output voltage.
FAN2502-XX Bypass.
FAN2503-XX Error.
0:
Output voltage < 95% of nominal.
1:
Output voltage > 95% of nominal.
Enable.
0:
Shutdown V
OUT
1:
Enable V
OUT
.
Voltage Input.
Supply voltage input.
Voltage Output.
Regulated output voltage.
Ground.
Ratio of potential divider from VOUT to ADJ
BYP
ERR
4
4
Passive
Open drain
Connect 470 pF capacitor for noise reduction.
Error flag output.
EN
3
Digital Input
.
V
IN
1
5
2
Power in
Power out
Power
V
GND
OUT
1
5
2
3
V
IN
GND
EN
4
V
OUT
ADJ/BYP/ERR
Functional Description
Designed utilizing CMOS process technology, the
FAN2502/03 family of products are carefully optimized for
use in compact battery-powered devices, offering a unique
combination of low power consumption, extremely low
dropout voltages, high tolerance for a variety of output
capacitors, and the ability to disable the output to less than
1μA under user control. In the circuit, a difference amplifier
controls the current through a series-pass P-Channel
MOSFET, comparing the load voltage at the output with an
onboard low-drift bandgap reference. The series resistance
of the pass P-Channel MOSFET is approximately 1
resulting in an unusually low dropout voltage under load
when compared to older bipolar pass-transistor designs.
,
Protection circuitry is provided onboard for overload condi-
tions. In conditions where the device reaches temperatures
exceeding the specified maximums, an onboard circuit shuts
down the output, where it remains suspended until it has
cooled before re-enabling. The user is also free to shut down
the device using the Enable control pin at any time.
Careful design of the output regulator amplifier assures loop
stability over a wide range of ESR values in the external
output capacitor. A wide range of values and types can be
accomodated, allowing the user to select a capacitor meeting
his space, cost, and performance requirements, and enjoy
reliable operation over temperature, load, and tolerance
variations.
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