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Fairchild Semiconductor Electronic Components Datasheet

FAN2508 Datasheet

50 mA CMOS LDO Regulators

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FAN2508 pdf
FAN2508, FAN2509
50 mA CMOS LDO Regulators
www.fairchildsemi.com
Features
• Ultra Low Power Consumption
• 50 mV dropout voltage at 50 mA
• 25 µA ground current at 50 mA
• Enable/Shutdown Control
• SOT23-5 package
• Thermal limiting
• 300 mA peak current
Applications
• Cellular Phones and accessories
• PDAs
• Portable cameras and video recorders
• Laptop, notebook and palmtop computers
Description
The FAN2508/09 family of micropower low-dropout voltage
regulators utilize CMOS technology to offer a new level of
cost-effective performance in GSM and TDMA cellular
handsets, Laptop and Notebook portable computers, and
other portable devices. Features include extremely low
power consumption and low shutdown current, low dropout
voltage, exceptional loop stability able to accommodate a
Block Diagrams
VIN
Bandgap
EN
Error
Amplifier
p
VOUT
ADJ
FAN2508
Thermal
Sense
GND
VIN
Bandgap
wide variety of external capacitors, and the compact SOT23-5
surface-mount package. The FAN2508/09 family of products
offer significant improvements over older BiCMOS designs
and are pin-compatible with many popular devices. The
output is thermally protected against overload.
The FAN2508 and FAN2509 devices are distinguished by
the assignment of pin 4:
FAN2508: pin 4 – ADJ, allowing the user to adjust the
output voltage over a wide range using an external voltage
divider.
FAN2508-XX: pin 4 – BYP, to which a bypass capacitor
may be connected for optimal noise performance. Output
voltage is fixed, indicated by the suffix XX.
FAN2509-XX: pin 4 – ERR, a flag which indicates that the
output voltage has dropped below the specified minimum
due to a fault condition.
The standard fixed output voltages available are 2.5V, 2.6V,
2.7V, 2.8V, 2.85V, 3.0V, and 3.3V. Custom output voltage are
also available: please contact your local Fairchild Sales
Office for information.
VIN
Bandgap
EN
Error
Amplifier
p
BYP
VOUT
FAN2508-XX
EN
Error
Amplifier
p
Thermal
Sense
ERR
VOUT
GND
FAN2509-XX
Thermal
Sense
GND
REV. 1.0.6 2/14/03


Fairchild Semiconductor Electronic Components Datasheet

FAN2508 Datasheet

50 mA CMOS LDO Regulators

No Preview Available !

FAN2508 pdf
PRODUCT SPECIFICATION
Pin Assignments
FAN2508/FAN2509
VIN 1
GND 2
EN 3
5 VOUT
4 ADJ/BYP/ERR
Pin No.
1.
2.
3.
4.
5.
FAN2508
VIN
GND
EN
ADJ
VOUT
FAN2508-XX
VIN
GND
EN
BYP
VOUT
FAN2509-XX
VIN
GND
EN
ERR
VOUT
Pin Descriptions
Pin Name Pin No. Type
ADJ 4 Input
BYP
ERR
4 Passive
4 Open drain
EN 3 Digital Input
VIN
VOUT
GND
1 Power in
5 Power out
2 Power
Pin Function Description
FAN2508 Adjust. Ratio of potential divider from VOUT to ADJ
determines output voltage.
FAN2508-XX Bypass. Connect 470 pF capacitor for noise reduction.
FAN2509-XX Error. Error flag output.
0: Output voltage < 95% of nominal.
1: Output voltage > 95% of nominal.
Enable.
0: Shutdown VOUT.
1: Enable VOUT.
Voltage Input. Supply voltage input.
Voltage Output. Regulated output voltage.
Ground.
Functional Description
Designed utilizing CMOS process technology, the
FAN2508/09 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.
2 REV. 1.0.6 2/14/03


Part Number FAN2508
Description 50 mA CMOS LDO Regulators
Maker Fairchild Semiconductor
Total Page 10 Pages
PDF Download
FAN2508 pdf
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