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SC1401ISS Datasheet

  • SC1401ISS

  • HIGH PERFORMANCE SYNCHRONOUS BUCK CONTROLLER WITH LDO FOR PO...

  • 17頁

  • SEMTECH   SEMTECH

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HIGH PERFORMANCE SYNCHRONOUS BUCK
CONTROLLER WITH LDO FOR PORTABLE
POWER
November 21, 2000
SC1401
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1401 is a synchronous buck regulator designed
to power the latest generation microprocessors in
battery operated systems. The SC1401 may be used
to provide both the I/O and core voltages utilizing
synchronous rectification for the core supply voltage
and an LDO N-Channel MOSFET controller for the I/O
supply voltage. A 1.25 volt reference allows lower
output voltages required by today鈥檚 portable
microprocessors.
The synchronous buck regulator is capable of
achieving efficiencies up to 95%. The gate drive
circuitry can deliver 2.0A peak currents, allowing the
use of N-channel MOSFETs for lower switching and
conduction losses.
A digital soft start is provided to ensure orderly start up
of the power supply without the need for external
components. At light load in power save mode, the
controller changes mode of operation by missing gate
drive cycles, thus reducing gate drive current and
improving efficiency. A logic high on PSAVE disables
the power saving mode thus reducing noise. The
SC1401 is fabricated in a high performance BiCMOS
process. This process reduces the power dissipation
in low current and shutdown operation modes and
improves efficiency.
The LDO controller is a high performance positive
voltage regulator designed to provide a low noise
power source to the microprocessor peripherals by
driving a low cost external N-Channel MOSFET.
VIN
C1
C2
C3
C4
C5
FEATURES
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>90% Efficiency (SMPS)
6.0V to 30V Input range
1.25V to 5.5V Adjustable output (SMPS)
PWM and LDO regulator outputs
High output gate drive of 2 Amps (SMPS)
Power save mode for light load operation
200kHz/300kHz fixed-frequency PWM operation
2mA Typical quiescent current
2碌A Typical shutdown current
APPLICATIONS
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Notebook and palmtop computers
LCD monitors
Internet appliances
ORDERING INFORMATION
DEVICE
SC1401ISS
PACKAGE
SSOP-20
TEMP. (T
A
)
-40擄C - +85擄C
Notes
(1) Add suffix 鈥淭R鈥?for tape and reel.
TYPICAL APPLICATION CIRCUIT
ENABLE_IO
RESET
PSAVE
U1
SYNC
1
SYNC
SC1401ISS
PSAVE
20
Q1
SHDN
2
SHDN
RESET
19
D1
VO_LINEAR
C6
VDD2
3
FB
ENABLEIO
18
R1
C7
C8
4
VDD1
IOS
17
R2
+5V
5
R3
6
GND
GATEIO
16
CSL
VDD2
15
D2
Q2
7
CSH
BST
14
C9
L1
R4
VO_SMPS
C12
R5
C13
C14
+5V
C10
C11
8
V5V
DH
13
9
DL
PHASE
12
D4
C15
D3
10
PGND
PGND
11
Q3
R6
R7
C16
1
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD
NEWBURY PARK CA 91320

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