SC1152CS Semtech Corporation, SC1152CS Datasheet

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SC1152CS

Manufacturer Part Number
SC1152CS
Description
Manufacturer
Semtech Corporation
Datasheet

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April 28, 1998
DESCRIPTION
The SC1152 is a low-cost, full featured, synchronous
voltage-mode controller designed for use in single
ended power supply applications where efficiency is of
primary concern. Synchronous operation allows for the
elimination of heat sinks in many applications. The
SC1152 is ideal for implementing DC/DC converters
needed to power advanced microprocessors such as
Pentium
cessor configurations. Internal level-shift, high-side
drive circuitry, and preset shoot-thru control, allows for
use of inexpensive n-channel power switches.
SC1152 features include an integrated 5-bit V
temperature compensated voltage reference, triangle
wave oscillator, current limit comparator, frequency
shift over-current protection, and an accessible, inter-
nally compensated error amplifier. Power good signal-
ing, logic compatible shutdown, and over voltage pro-
tection are also provided.
The SC1152 operates at a fixed 200KHz, providing an
optimum compromise between efficiency, external
component size, and cost.
PIN CONFIGURATION
© 1998 SEMTECH CORP.
®
ll (Klamath), in both single and multiple pro-
(20-Pin SOIC)
Top View
PROGRAMMABLE SYNCHRONOUS DC/DC
CONTROLLER FOR ADVANCED PROCESSORS
VID4
VID0
VID3
VID2
VID1
VOSENSE
OPEN COLLECTORS
BLOCK DIAGRAM
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
PWRGOOD
ID
OVP
DAC,
D/A AND
SHUT-
DOWN
LOGIC
1.25V REF
VCC
DECODED SHUTDOWN SIGNAL
+
-
+
-
+
-
FEATURES
APPLICATIONS
ORDERING INFORMATION
Note:
(1) Add suffix ‘TR’ for tape and reel.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SC1152CS
DEVICE
VCC
VCC
Low cost / full featured
Synchronous operation
5 Bit V
On-chip power good and OVP functions
Designed to meet Intel VRM8.1 (Pentium
Pentium® II (Klamath) Core Supply
Multiple Microprocessor Supplies
Voltage Regulator Modules (VRM)
Programmable Power Supplies
High Efficiency DC/DC Conversion
OSCILLATOR
CS(-)
70mV
(1)
ID
CS(+)
DAC programmable output
+
-
CURRENT LIMIT
200 kHz
ERROR
AMP
+
-
GND
GND
Pentium is a registered trademark of Intel Corporation
PACKAGE
SO-20
+
-
R
S
Q
SHUTDOWN
TEMP. RANGE (T
SHOOT-THRU
SYNCHRONOUS
0 - 125°C
LEVEL SHIFT
UPPER FET
AND DRIVE
CONTROL
DRIVE
FET
SC1152
®
II)
BSTH
DH
PGNDH
BSTL
DL
PGNDL
J
)
1

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SC1152CS Summary of contents

Page 1

... Pentium® II (Klamath) Core Supply Multiple Microprocessor Supplies Voltage Regulator Modules (VRM) Programmable Power Supplies DAC, High Efficiency DC/DC Conversion ID ORDERING INFORMATION (1) DEVICE PACKAGE SC1152CS Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM VCC CS(-) CS(+) CURRENT LIMIT 1.25V REF VCC + ...

Page 2

April 28, 1998 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Maximum V to GND PGND to GND BST to GND -0 Thermal Resistance Junction to Case JC Thermal Resistance Junction to Ambient JA Operating T A Temperature ...

Page 3

April 28, 1998 PIN DESCRIPTION Pin # Pin Name 1 GND OVP (1) 4 PWRGOOD 5 CS(-) 6 CS(+) 7 PGNDH PGNDL BSTL 13 BSTH (1) 14 SHUTDOWN ...

Page 4

... VID3 BSTH 8 SHUTDOWN GND PGNDH 11 PGNDL BSTL SC1152CS Figure 1. Vendor Notes Various SANYO MV-GX or equiv. Low ESR Various 8 Turns 16AWG on MICROMETALS T50-52D core See notes FET selection requires trade-off between efficiency and cost. Absolute maximum R IRC OAR-1 Series Various Various Various ...

Page 5

April 28, 1998 OUTPUT VOLTAGE TABLE Unless specified 4.75V to 5.25V; GND = PGND = 0V PARAMETER (1) Output Voltage Application Circuit O (Figure 1) NOTE: (1) All VID codes ...

Page 6

April 28, 1998 CHARACTERISTIC CURVES SC1152 Efficiency in Application Circuit (Figure 1). 95.0% 90.0% 85.0% Efficiency 80.0% 75.0% 70.0% 0.000 2.000 4.000 6.000 8.000 Output Current (Amps) SC1152 Regulation in Application Circuit (Figure 1). 0.000 -0.005 Delta 1.8 -0.010 Vout ...

Page 7

April 28, 1998 OUTLINE DRAWING SO-20 © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1152 Ref. MS-013AC 7 ...

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