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FAN2504 Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte FAN2504
Spiegazioni elettronici  200 mA CMOS LDO Regulators
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN2504 Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN2504/FAN2505
2
REV. 1.0.9 12/17/10
Pin Assignments
Pin Descriptions
Pin No.
FAN2504
FAN2504-XX
FAN2505-XX
1.
VIN
VIN
VIN
2.
GND
GND
GND
3.
EN
EN
EN
4.
ADJ
BYP
ERR
5.
VOUT
VOUT
VOUT
Pin Name
Pin No.
Type
Pin Function Description
ADJ
4
Input
FAN2504 Adjust. Ratio of potential divider from VOUT to ADJ
determines output voltage.
BYP
4
Passive
FAN2504-XX Bypass. Connect 470 pF capacitor for noise reduction.
ERR
4
Open drain
FAN2505-XX Error. Error flag output.
0: Output voltage < 95% of nominal.
1: Output voltage > 95% of nominal.
EN
3
Digital Input
Enable.
0: Shutdown VOUT.
1: Enable VOUT.
VIN
1
Power in
Voltage Input. Supply voltage input.
VOUT
5
Power out
Voltage Output. Regulated output voltage.
GND
2
Power
Ground.
15
2
3
VIN
GND
EN
4
VOUT
ADJ/BYP/ERR
Functional Description
Designed utilizing CMOS process technology, the
FAN2504/05 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
Ω,
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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