SC1162 Datasheet, PDF (1/12 Pages) Semtech Corporation – PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER WITH LOW DROPOUT REGULATOR CONTROLLER

October 25, 1999
PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER WITH LOW DROPOUT
REGULATOR CONTROLLER
SC1162/3
TEL:[phone] FAX:[phone] WEB:http://www.semtech.com
DESCRIPTION
The SC1162/3 combines a synchronous voltage mode
controller with a low-dropout linear regulator providing
most of the circuitry necessary to implement two DC/
DC converters for powering advanced microprocessors
such as Pentium^® II.
The SC1162/3 switching section features an integrated
5 bit D/A converter, pulse by pulse current limiting,
integrated power good signaling, and logic compatible
shutdown. The SC1162/3 switching section operates at
a fixed frequency of 200kHz, providing an optimum
compromise between size, efficiency and cost in the
intended application areas. The integrated D/A con-
verter provides programmability of output voltage from
2.0V to 3.5V in 100mV increments and 1.30V to 2.05V
in 50mV increments with no external components.
The SC1162/3 linear section is a high performance
positive voltage regulator design for either the GTL bus
supply at 1.5V (SC1162) or an adjustable output
(SC1163).
The output of the linear regulator can provide up to 5A
or more with the appropriate external MOSFET.
FEATURES
• Synchronous design, enables no heatsink solution
• 95% efficiency (switching section)
• 5 bit DAC for output programmability
• On chip power good function
• Designed for Intel Pentium^® II requirements
• 1.5V or Adj. @ 1% for linear section
• 1.300V-2.05V ±1.5%; 2.100V-3.500V ±2%
APPLICATIONS
• Pentium^® ll or Deschutes microprocessor supplies
• Flexible motherboards
• 1.3V to 3.5V microprocessor supplies
• Programmable dual power supplies
ORDERING INFORMATION
Part Number⁽¹⁾ Package
Linear
Voltage
SC1162CSW SO-24 1.5V
Temp.
Range (T_J)
0° to 125°C
SC1163CSW SO-24
Adj. 0° to 125°C
Note:
(1) Add suffix ‘TR’ for tape and reel.
PIN CONFIGURATION
BLOCK DIAGRAM
Top View
(24 Pin SOIC)
VCC CS- CS+
EN
VID4
VID3
VID2
VID1
VID0
1.25 REF
VCC
D/A &
SHUT-
DOWN
LOGIC
CURRENT LIMIT
70mV
OSCILLATOR
R
Q
S
BSTH
LEVEL SHIFT
AND HIGH SIDE
DH
MOSFET DRIVE
PGNDH
VOSENSE
PWRGOOD
OPEN
COLLECTORS
VCC
ERROR
AMP
OVP
AGND
1.265V
REF
SHOOT-
THRU
CONTROL
SYNCHRONOUS
MOSFET DRIVER
BSTL
DL
FET
CONTROLLER
PGNDL
LDOV
GATE LDOS
© 1999 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
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