sc1146csw.tr Semtech Corporation, sc1146csw.tr Datasheet

sc1146csw.tr

Manufacturer Part Number

sc1146csw.tr

Description

Vrm9.0 Programmable, Multi-phase, High Performance Pwm Controller

Manufacturer

Semtech Corporation

Datasheet

1.SC1146CSW.TR.pdf (10 pages)

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July 25, 2000

DESCRIPTION

The SC1146 is the latest, high performance, multi-

phase (PWM) controller designed for high power mi-

croprocessors requiring ultra fast transient response.

The SC1146 is programmable for the voltage range

required by the latest Microprocessors . Utilizing a

novel and unique design, the controller distributes the

output load across (up to) four converter channels by

digitally phase shifting the PWM outputs. This ap-

proach greatly reduces the stress and heat on the out-

put stage components while lowering input ripple cur-

rent by as much as 80%. Accurate current sharing

among the four phases is achieved by precision design

techniques and trimming of critical elements.

The high speed transconductance error amplifier is ex-

ternally initialized using a soft-start capacitor allowing

the controller to “wake-up” without overshoot, thus pro-

tecting the low voltage microprocessor loads. The out-

put drive voltage to the power MOSFETs is pro-

grammable to minimize switching losses in the drive

circuitry.

The output voltage is digitally programmable by means

of a 5 bit DAC (new codes). A single resistor programs

the master clock frequency (8MHz max) or the clock

can be supplied by an external source where exact fre-

quency control is desired. The number of operating

phases is programmed independently of the external

clock. The parts features under-voltage lock-out with

hysteresis and over-current protection.

PIN CONFIGURATION

The SC1146 is patent pending

(24-Pin SOIC)

Top View

VRM9.0 PROGRAMMABLE, MULTI-PHASE,

HIGH PERFORMANCE PWM CONTROLLER

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

FEATURES

APPLICATIONS

ORDERING INFORMATION

SC1146CSW.TR

Note:

(1) Only available in tape and reel packaging. A reel

contains 1000 devices.

BLOCK DIAGRAM

652 MITCHELL ROAD NEWBURY PARK CA 91320

DEVICE

Allows use of small surface mount components

Ultra fast transient recovery time

Dramatic reduction of input ripple current and out-

put ripple voltage

5-bit programmable DAC for the latest, lower

output voltage Microprocessors

Wide, High frequency operating range

Selectable 2, 3, 4 phase operation

+5 Volt only operation eliminates the need for

+12V supply

Precision load current sharing,1%PWM match

Selectable internal or external clock

Soft start/UVLO/Over current protection

High end servers and workstations

High current/Ultra-fast transient microprocessors

(1)

Pentium is a registered trademark of Intel Corporation

PACKAGE

SO-24

TEMP. (T

0 - 85°C

SC1146

)

Related parts for sc1146csw.tr

sc1146csw.tr Summary of contents

Page 1

... Selectable internal or external clock = Soft start/UVLO/Over current protection APPLICATIONS = High end servers and workstations = High current/Ultra-fast transient microprocessors ORDERING INFORMATION (1) DEVICE SC1146CSW.TR Note: (1) Only available in tape and reel packaging. A reel contains 1000 devices. BLOCK DIAGRAM 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1146 PACKAGE TEMP SO- 85° ...

Page 2

July 25, 2000 ABSOLUTE MAXIMUM RATINGS Parameter V to GND CC5V FBG to GND V to GND CC2 Operating Temperature Range Junction Temperature Range Storage Temperature Range Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Lead Temperature (Soldering) ...

Page 3

July 25, 2000 ELECTRICAL CHARACTERISTICS (Cont.) Unless otherwise noted PARAMETER SYMBOL Bgout Voltage Bgout Impedance External Clock Freq. Range F Oscillator Frequency Internal Clock Freq. Range Match DRV0-3 PWM Off Time Overcurrent Comparator, OCC_CMR ...

Page 4

July 25, 2000 PIN DESCRIPTION Pin # Pin Name Divsel 3 Clksel 4 Extclk 5 R REF (1) 6 VID0 (1) 7 VID1 (1) 8 VID2 (1) 9 VID3 (1) 10 VID4 11 OC+ 12 ...

Page 5

July 25, 2000 OUTPUT VOLTAGE Unless specified GND High (or Floating 5V 5V, 4-Phase operation. A CC5V CC2 VID4 VID3 ...

Page 6

Long PCB Trace 10K R33 SMOD Power Good C11 C12 C13 Pwrgood INPUT Divsel Drv3 S1 10K 10K 10K ...

Page 7

July 25, 2000 BILL OF MATERIAL Item Qty Reference 1 9 C2,C4,C11,C19,C20,C28,C29,C37,C39 C5,C12,C14,C17,C18,C21,C22,C26,C27 4 5 C6,C7,C15,C24,C32 C16,C25,C33 7 1 C40 8 1 C42 9 2 C45,C49 10 1 C46 11 ...

Page 8

July 25, 2000 THEORY OF OPERATION FUNCTIONAL DESCRIPTION The SC1146 is a programmable, high performance, multi-phase controller designed for the most demand- ing DC/DC converter applications in which transient response, space, input ripple current and component form factor and cost ...

Page 9

July 25, 2000 ERROR AMPLIFIER CONT. Fig. 3: Transient response, Top trace, Current sense 8A/div @ 30A/usec. Bottom trace, V Fig. 4: Transient response, Top trace, Gate Drive Bottom trace, Transient current 16A/div @ 30A/usec. The error amplifier has two ...

Page 10

July 25, 2000 An evaluation board is available which may be ordered directly from the factory. SC1146/1405EVB is a DC/DC converter utilizing the SC1146 four-phase controller in a high current synchronous application. The evaluation board is intended as a guideline ...

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