
www.fairchildsemi.com
REV. 1.1.7 2/14/03
Features
Ultra Low Power Consumption
150 mV dropout voltage at 150 mA
25 μA ground current at 150 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 FAN2502/03 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
wide variety of external capacitors, and the compact SOT23-5
surface-mount package. The FAN2502/03 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 FAN2502 and FAN2503 devices are distinguished by
the assignment of pin 4:
FAN2502:
output voltage over a wide range using an external voltage
divider.
pin 4 – ADJ, allowing the user to adjust the
FAN2502-XX:
may be connected for optimal noise performance. Output
voltage is fixed, indicated by the suffix XX.
pin 4 – BYP, to which a bypass capacitor
FAN2503-XX:
output voltage has dropped below the specified minimum
due to a fault condition.
pin 4 – ERR, a flag which indicates that the
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.
FAN2502, FAN2503
150 mA CMOS LDO Regulators
Block Diagrams
FAN2502
EN
ADJ
GND
Thermal
Sense
p
VIN
VOUT
Bandgap
Error
Amplifier
FAN2502-XX
EN
BYP
GND
GND
Bandgap
Thermal
Sense
p
Error
Amplifier
VIN
VOUT
FAN2503-XX
EN
ERR
Bandgap
Thermal
Sense
p
Error
Amplifier
VIN
VOUT