Data Sheet

June 2016
© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN8303 • Rev. 1.2
FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator
FAN8303
2 A 23 V Non-Synchronous Step-Down DC/DC
Regulator
Features
 2 A Output Current
 0.22  Internal Power MOSFET Switch
 Wide 5 V to 23 V Operating Input Range
 Output Adjustable from 0.6 to 20 V
 Stable with Low ESR Output Ceramic Capacitors
 Up to 90% Efficiency
 Less than 40 µA Shutdown Current
 Fixed 370 kHz Frequency
 Thermal Shutdown with Hysteresis
 Cycle-by-Cycle Over-Current Protection
 Available in 8-Pin SOIC Package
Applications
 Set-Top Box
 DSL and Cable Modems
 Distributed Power Systems
 Consumer Appliances (DVD)
 Auxiliary supplies
Description
The FAN8303 is a monolithic, non-synchronous, step-
down (buck) regulator with internal power MOSFETs. It
achieves 2 A continuous output current over a wide
input supply range with excellent load and line
regulation. Current-mode operation provides fast
transient response and eases loop stabilization. Fault
condition protection includes cycle-by-cycle current
limiting and thermal shutdown. The regulator draws less
than 40 µA shutdown current. FAN8303 requires a
minimum number of readily available standard external
components.
External compensation, enable, and programmable
soft-start features allow design optimization and
flexibility. Cycle-by-cycle current limit, frequency
foldback, and thermal shutdown provide protection
against shorted outputs.
FAN8303
SW
FB
BS
VIN
EN
SS
GND
COMP
RC
22k
CC
1nF
CA
OPEN
INPUT
5~23V
ENABLE
SHUTDOWN
OUTPUT
2.5V/2A
CBS
10nF
CSS
10nF
R
2
18k
R
3
5.6k
COUT
22µF
CIN
10µF
L1
15µ H
D1
Figure 1. Typical Application
Ordering Information
Part Number
Operating Temperature Range
Package
Packing Method
FAN8303MX
-40°C to +85°C
8-SOIC
Reel
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