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SC1401ISSTRT

Description
Switching Controller, Current-mode, 2A, 350kHz Switching Freq-Max, BICMOS, PDSO20, MO-150AE, SSOP-20
CategoryPower/power management    The power supply circuit   
File Size202KB,17 Pages
ManufacturerSEMTECH
Websitehttp://www.semtech.com
Environmental Compliance  
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SC1401ISSTRT Overview

Switching Controller, Current-mode, 2A, 350kHz Switching Freq-Max, BICMOS, PDSO20, MO-150AE, SSOP-20

SC1401ISSTRT Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
Parts packaging codeSSOP
package instructionSSOP,
Contacts20
Reach Compliance Codeunknown
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage6 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G20
JESD-609 codee3
length7.2 mm
Number of functions1
Number of terminals20
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current2 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency350 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width5.3 mm
Base Number Matches1
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’s 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
>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
2µA Typical shutdown current
APPLICATIONS
Notebook and palmtop computers
LCD monitors
Internet appliances
ORDERING INFORMATION
DEVICE
SC1401ISS
PACKAGE
SSOP-20
TEMP. (T
A
)
-40°C - +85°C
Notes
(1) Add suffix “TR” 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
© 2000 SEMTECH CORP.
652 MITCHELL ROAD
NEWBURY PARK CA 91320
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