SC1155 查看數據表（PDF） - Semtech Corporation

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SC1155

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

Semtech Corporation 

SC1155

POWER MANAGEMENT

AC Electrical Characteristics (Cont.)

(Note 1)

PRELIMINARY

Parameter

Overvoltage Protection

Comparator Propagation Delay Time

Deglitch Time (Includes comparator

protection delay time)

High-Side Vds Sensing

Response Time

Symbol

Conditions

Min Typ Max Units

tOVPROP

tOVPDGL

1

µs

1

3

µs

tVDSRESP

VHISENSE = 12V, VIOUTLO pulsed

from 12V to 11.9V, 100ns rise

and fall times

2

µs

VHISENSE = 4.5V, VIOUTLO pulsed

from 4.5V to 4.4V, 100ns rise

and fall times

3

µs

V

= 3V, V pulsed

HISENSE

IOUTLO

from 3.0v to 2.9V, 100ns rise

and fall times

3

µs

Short Circuit Protection Rising Edge

Delay

tVDSRED

LOSENSE grounded

300

500 ns

Sample/Hold Switch turn-on/turn-off

Delay

Power Good

tSWXDLY

3V < VHISENSE < 11V

V = V LOSENSE

HISENSE

30

100 ns

Comparator Propagation Delay

Softstart

tPWRGD

1

µs

Comparator Propagation Delay

Deadtime

tSLST

overdrive = 10mV

560 900 ns

Driver Nonoverlap Time

tNOL

CLOWDR = 9nF, 10% threshold on

LOWDR

30

100 ns

LODRV

Propagation Delay

TLODRVDLY

Notes:

(1) Guaranteed, but not tested.

(2) This device is ESD sensitive. Use of standard ESD handling precautions is required.

400 ns

 2001 Semtech Corp.

6

www.semtech.com

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