SC1154CSW Semtech Corporation, SC1154CSW Datasheet

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SC1154CSW

Manufacturer Part Number
SC1154CSW
Description
Manufacturer
Semtech Corporation
Datasheet
PRELIMINARY - March 1, 2000
DESCRIPTION
The SC1154 is a synchronous-buck switch-mode con-
troller designed for use in single ended power supply
applications where efficiency is the primary concern.
The controller is a hysteretic type, with a user se-
lectable hysteresis. The SC1154 is ideal for imple-
menting DC/DC converters needed to power advanced
microprocessors such as Pentium
and multiple processor configurations. Inhibit, under-
voltage lockout and soft-start functions are included for
controlled power-up.
SC1154 features include an integrated 5 bit D/A con-
verter, temperature compensated voltage reference,
current limit comparator, over-current protection, and
an adaptive deadtime circuit to prevent shoot-through
of the power MOSFET during switching transitions.
Power good signaling, logic compatible shutdown, and
over-voltage protection are also provided. The inte-
grated D/A converter provides programmability of out-
put voltage from 2.0V to 3.5V in 100mV increments
and 1.3V to 2.05V in 50mV increments with no external
components.
The SC1154 high side driver can be configured as ei-
ther a grounded reference or as a floating bootstrap
driver. High and low side drivers have a peak current
rating of 2 amps.
PIN CONFIGURATION
© 2000 SEMTECH CORP.
(28-Pin SOIC)
Top View
®
ll, in both single
PROGRAMMABLE SYNCHRONOUS
DC/DC HYSTERETIC CONTROLLER
FOR ADVANCED PROCESSORS
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
SIMPLIFIED BLOCK DIAGRAM
FEATURES
APPLICATIONS
ORDERING INFORMATION
Note:
(1) Add suffix ‘TR’ for tape and reel.
SC1154CSW
652 MITCHELL ROAD NEWBURY PARK CA 91320
DEVICE
Programmable hysteresis
5 bit DAC programmable output (1.3V-3.5V)
On-chip power good and OVP functions
Designed to meet latest Intel specifications
Up to 95% efficiency
+ 1% tolerance over temperature
Server Systems and Workstations
Pentium
Multiple Microprocessor Supplies
Voltage Regulator Modules
(1)
®
II Core Supply
Pentium is a registered trademark of Intel Corporation
PACKAGE
SO-28
TEMP. RANGE (T
0 - 125°C
SC1154
J
)
1

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SC1154CSW Summary of contents

Page 1

... APPLICATIONS Server Systems and Workstations Pentium Multiple Microprocessor Supplies Voltage Regulator Modules ORDERING INFORMATION (1) DEVICE SC1154CSW Note: (1) Add suffix ‘TR’ for tape and reel. SIMPLIFIED BLOCK DIAGRAM 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 ® II Core Supply PACKAGE TEMP ...

Page 2

PRELIMINARY - March 1, 2000 ABSOLUTE MAXIMUM RATINGS Parameter VIN12V BOOT to DRVGND BOOT to BOOTLO Digital Inputs AGND to DRVGND LOHIB to AGND LOSENSE to AGND IOUTLO to AGND HISENSE to AGND VSENSE to AGND Continuous Power Dissipation, T ...

Page 3

PRELIMINARY - March 1, 2000 PIN DESCRIPTION Pin Pin Name Pin Function 1 IOUT Current Out. The output voltage on this pin is proportional to the load current as measured across the high side MOSFET, and is approximately equal to ...

Page 4

PRELIMINARY - March 1, 2000 ELECTRICAL CHARACTERISTICS Unless specified: 0 < T < 125°C, VIN = 12V J PARAMETER SYMBOL Supply Voltage Range VIN12V Supply Current (Quiescent) High Side Driver Supply I BOOT Current (Quiescent) REFERENCE/VOLTAGE IDENTIFICATION Reference Voltage Accuracy ...

Page 5

PRELIMINARY - March 1, 2000 ELECTRICAL CHARACTERISTICS (cont.) Unless specified: 0 < T < 125°C, VIN = 12V J PARAMETER SYMBOL SOFT START Charge Current Discharge Current INHIBIT COMPARATOR Start Threshold Vstart VIN12V UVLO Start Threshold Vstart Hysteresis Vhys HYSTERETIC ...

Page 6

PRELIMINARY - March 1, 2000 ELECTRICAL CHARACTERISTICS (cont.) Unless specified: 0 < T < 125°C, VIN12V = 12V J PARAMETER SYMBOL HIGH-SIDE VDS SENSING (cont.) LOSENSE High Level Input Vih Voltage LOSENSE Low Level Input Vil Voltage Sample/Hold Resistance BUFFERED ...

Page 7

PRELIMINARY - March 1, 2000 ELECTRICAL CHARACTERISTICS (cont.) Unless specified: 0 < T 125°C, VIN12V = 12V J < PARAMETER SYMBOL HIGH-SIDE OUTPUT DRIVER (cont.) Output Resistance Rsrc Rsink LOW-SIDE OUTPUT DRIVER Peak Outout Current Isrc Isink Output Resistance Rsrc ...

Page 8

PRELIMINARY - March 1, 2000 ELECTRICAL CHARACTERISTICS (cont.) Unless specified: 0 < T < 125° C, VIN12V = 12V J PARAMETER SYMBOL (1) HIGH-SIDE Vds SENSING Response Time t VDSRESP Short Circuit Protection t Rising Edge Delay Sample/Hold Switch turn- ...

Page 9

PRELIMINARY - March 1, 2000 BLOCK DIAGRAM © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 9 ...

Page 10

PRELIMINARY - March 1, 2000 OUTPUT VOLTAGE TABLE 0 = GND Floating or +5V pull-up VID4 VID3 ...

Page 11

PRELIMINARY - March 1, 2000 FUNCTIONAL DESCRIPTION Reference/Voltage Identification The reference/voltage identification (VID) section con- sists of a temperature compensated bandgap refer- ence and a 5-bit voltage selection network. The 5 VID pins are TTL compatable inputs to the VID ...

Page 12

PRELIMINARY - March 1, 2000 FUNCTIONAL DESCRIPTION (cont.) resistor divider, and connected to the DROOP pin. Thus, under loaded conditions, VOUT is regulated to Vout = Vref • (1+R7/R8) - IOUT • R2/(R1+R2). Inhibit The inhibit pin is a TTL ...

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PRELIMINARY - March 1, 2000 APPLICATION CIRCUIT © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 13 ...

Page 14

PRELIMINARY - March 1, 2000 MATERIALS LIST Quantity Reference C1-C4, C8, C11 3 C17-C19 7 C6,C7,C9,C12,C16,C20, C27 2 C13,C14 6 C21-C26 2 C10,C15 RA, ...

Page 15

PRELIMINARY - March 1, 2000 EVALUATION BOARD ARTWORK © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS TOP LAYER BOTTOM LAYER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 15 ...

Page 16

PRELIMINARY - March 1, 2000 EVALUATION BOARD LAYOUT © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS TOP VIEW BOTTOM VIEW 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 16 ...

Page 17

PRELIMINARY - March 1, 2000 TEST DATA 100.0 95.0 90.0 85.0 % 80.0 75.0 70.0 65.0 60.0 0 5.00 4.00 3.00 2.00 1.00 % 0.00 0 -1.00 -2.00 -3.00 -4.00 -5.00 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER ...

Page 18

PRELIMINARY - March 1, 2000 OUTLINE - SO-28 ECN00-904 © 2000 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER FOR ADVANCED PROCESSORS 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1154 18 ...

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