FAN8303 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – 2A 23V Non-Synchronous Step-Down DC/DC Regulator

December 2008
FAN8303
2A 23V Non-Synchronous Step-Down DC/DC Regulator
Features
ƒ 2A Output Current
ƒ 0.22Ω Internal Power MOSFET Switch
ƒ Wide 5V to 23V Operating Input Range
ƒ Output Adjustable from 0.6 to 20V
ƒ Stable with Low ESR Output Ceramic Capacitors
ƒ Up to 90% Efficiency
ƒ Less than 40µA Shutdown Current
ƒ Fixed 370kHz Frequency
ƒ Thermal Shutdown with Hysteresis
ƒ Cycle-by-Cycle Over-Current Protection
ƒ Available in 8-Pin SOIC Package
Applications
ƒ Set-Top Box
ƒ DSL and Cable Modems
ƒ Distributed Power Systems
ƒ Consumer Appliances (DVD)
ƒ Auxiliary supplies
Description
The FAN8303 is a monolithic, non-synchronous, step-
down (buck) regulator with internal power MOSFETs. It
achieves 2A 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 40µA
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.
INPUT
5~23V
C IN
10 µF
ENABLE
SHUTDOWN
CSS
10 nF
CBS
10 nF
VIN
BS
EN
SW
FAN8303
SS
GND
FB
COMP
RC
22 k
CC
1nF
CA
OPEN
L1
15 µ H
D1
R2
18 k
R3
5.6 k
OUTPUT
2.5V/2A
COU T
22 µF
Figure 1. Typical Application
Ordering Information
Part Number
Eco Status ^{Operating Temperature Range Package}
Packing Method
FAN8303MX
RoHS
-40°C to +85°C
8-SOIC
Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.0.0
www.fairchildsemi.com