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SC1155
(Rev.:2000)

PROGRAMMABLE SYNCHRONOUS DC/DC HYSTERETIC CONTROLLER WITH VRM 9.0 VID RANGE

Semtech Corporation 

PROGRAMMABLE SYNCHRONOUS

DC/DC HYSTERETIC CONTROLLER

WITH VRM 9.0 VID RANGE

PRELIMINARY - August 7, 2000

DYNAMIC ELECTRICAL CHARACTERISTICS

Unless specified: 0 < TJ < 125°C, VIN12V = 12V

PARAMETER

SYMBOL

CONDITIONS

MIN

HYSTERETIC COMPARATORS(1)

Propagation Delay Time

from

VSENSE to HIGHDR or

LOWDR (excluding

deadtime)

tHCPROP

10mV overdrive,

1.3V < Vref < 3.5V

OUTPUT DRIVERS(2)

HIGHDR rise/fall time

trHIGHDR

,tfHIGHDR

LOWDR rise/fall time

trLOWDR ,

tfLOWDR

OVERCURRENT PROTECTION(1)

Cl = 9nF, VBOOT = 6.5v,

VBOOTLO = grounded,

TJ = 125 °C

Cl = 9nF, VDRV = 6.5v,

TJ = 125 °C

Comparator Propagation

Delay Time

tOCPROP

Deglitch Time (Includes

tOCDGL

2

comparator propagation

delay time)

OVERVOLTAGE PROTECTION(1)

Comparator Propagation

Delay Time

Deglitch Time (Includes

comparator propagation

delay time)

HIGH-SIDE Vds SENSING(1)

Response Time

Short Circuit Protection

Rising Edge Delay

Sample/Hold Switch turn-

on/turn-off Delay

tOVPROP

tOVDGL

2

tVDSRESP

VHISENSE = 12v, VIOUTLO pulsed

from 12v to 11.9v, 100ns rise

and fall times

VHISENSE = 4.5v, VIOUTLO pulsed

from 4.5v to 4.4v, 100ns rise

and fall times

VHISENSE = 3v, VIOUTLO pulsed

from 3.0v to 2.9v, 100ns rise

and fall times

tVDSRED

LOSENSE grounded

300

tSWXDLY

3v < VHISENSE < 11v

30

VLOSENSE = VHISENSE

TYP

150

1

1

SC1155

MAX UNITS

250

ns

60

ns

60

ns

µs

5

µs

µs

5

µs

2

µs

3

µs

3

µs

500

ns

100

ns

7

© 2000 SEMTECH CORP.

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