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FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator
June 2016
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
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.
C
BS
10 nF
Applications
INPUT
5~23V
Set-Top Box
DSL and Cable Modems
Distributed Power Systems
Consumer Appliances (DVD)
Auxiliary supplies
ENABLE
SHUTDOWN
C
IN
10 µF
VIN
BS
L
1
15 µH
EN
SW
OUTPUT
2.5V/2A
D1
FAN8303
SS
GND
C
SS
10 nF
FB
COMP
R
2
18 k
C
OUT
22 µF
R
C
22 k
R
3
5.6 k
C
A
OPEN
C
C
1nF
Figure 1. Typical Application
Ordering Information
Part Number
FAN8303MX
Operating Temperature Range
-40°C to +85°C
Package
8-SOIC
Packing Method
Reel
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