SC1401 查看數據表（PDF） - Semtech Corporation
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SC1401 Datasheet PDF : 17 Pages
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HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
SC1401
POWER
November 21, 2000
PIN DESCRIPTION
Pin #
1
Pin Name
SYNC
2
SHDN
3
FB
4
VDD1
5
GND
6
CSL
7
CSH
8
V5V
9
DL
10
PGND
11
PGND
12
PHASE
Pin Function
Oscillator control/synchronization input. Connect to V5V for 300kHz. Connect to
GND for 200kHz. For external clock synchronization in the 240kHz to 350kHz
range. A high-to-low transition causes a new cycle start.
Logic Low shuts down the switching regulator.
Feedback input for the SMPS. FB selects fixed 1.25V output voltage setting
when tied to VOUT. Connect FB to a resistor divider for adjustable output mode.
V O (SMPS)
=
1.25
•
1 +
R8
R9
Refer to page 9.
Supply input from battery (6V to 30V).
Low noise analog ground and feedback reference point.
Inverting input to current sense amplifier. Also serves as the feedback input in
fixed output mode.
Non-Inverting input to current sense amplifier. Current limit level is 120mV
referenced to CSL.
5 volt external supply used to power the gate drives, internal control and
reference of the SC1401.
Gate drive output for low side synchronous rectifier MOSFET.
Device power ground.
Device power ground.
Inductor switching node connected to the source of high side MOSFET
and drain of low side MOSFET.
13
DH
14
BST
15
VDD2
16
GATEIO
17
IOS
18
ENABLEIO
19
RESET
20
PSAVE
Gate drive output for high side N-Channel MOSFET. DH is a floating driver
output driven from the floating voltage across BST to PHASE.
Boost capacitor connection for the high side driver.
Supply voltage input for the linear FET controller.
Gate drive output for the linear FET controller.
Sense input voltage for the adjustable voltage linear FET controller.
V O (Linear)
= 1.25
•
1 +
R5
R6
Refer
to
page
9.
Logic low shuts down the linear FET controller.
Active-Low reset output.
A logic low enables power saving mode.
Note: All logic level inputs and outputs are open collector TTL compatible.
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320
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