FAN8303 Fairchild Semiconductor, FAN8303 Datasheet - Page 3

• Manufacturer Part Number: FAN8303
• Description: The FAN8303 is a monolithic, non-synchronous, stepdown (buck) regulator with internal power MOSFETs
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.0.0
Pin Configuration
Pin Definitions
Name
COMP
GND
SW
EN
BS
V
FB
SS
IN
Pin #
1
2
3
4
5
6
7
8
Supply Voltage
Switch
Ground
Bootstrap
Feedback
Compensation
Enable
Soft Start
Type
Figure 3.
GND
VIN
BS
SW
High-Side Drive BOOT Voltage. Connect through capacitor (C
The IC includes an internal synchronous bootstrap diode to recharge the
capacitor on this pin to V
Power Input. This pin needs to be closely decoupled to the GND pin with a
10µF or greater ceramic capacitor.
Power Switching Output. SW is the switching node that supplies power to
the output.
Power Return and Signal Ground for the IC. All internal control voltages
are referred to this pin. Tie this pin to the ground island / plane through the
lowest impedance connection. This pin is the ground reference for the
regulated output voltage.
Feedback Input. This pin is the center tap of the external feedback voltage
resistive divider across the output.
Compensation Node. Frequency compensation is accomplished at this
node by connecting a series R-C to ground.
Enable Input. EN is a digital input that turns the regulator on or off. Drive
EN HIGH to turn on the regulator, drive it LOW to turn it off. For automatic
startup, leave EN unconnected.
External Soft-Start. A capacitor connected between this pin and GND can
be used to set soft-start time.
Pin Configuration (Top View)
3
CC
SS
COMP
FB
EN
when SW is LOW.
Description
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BS
) to SW.