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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

SC1155

PRELIMINARY - August 7, 2000

ELECTRICAL CHARACTERISTICS

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

PARAMETER

SYMBO

L

CONDITIONS

MIN TYP MAX UNITS

Supply Voltage Range

VIN12V

11.4 12 13

V

Supply Current (Quiescent)

High Side Driver Supply

Current (Quiescent)

IINq

IBOOTq

INH = 5V, VID not 11111,

VIN above UVLO threshold during start-up,

fSW = 200kHz, BOOTLO = 0V,

CDH = CDL = 50pF

INH = 0V or VID = 11111 or VIN below

UVLO threshold during start-up,

BOOT = 13V, BOOTLO = 0V

15

mA

10 µA

INH = 5V, VID not 11111, VIN

5

mA

above UVLO threshold during start-up,

fSW = 200kHz, BOOT = 13V, BOOTLO = 0V,

CDH = 50pF

REFERENCE/VOLTAGE IDENTIFICATION

Reference Voltage Accuracy VREF 11.4V < VIN12V < 12.6V, over full VID

-1

range (see Output Voltage Table)

1

%

VID0 - VID4 High Threshold

Voltage

VTH(H)

2.25

V

VID0 - VID4 Low Threshold

Voltage

VTH(L)

1

V

POWER GOOD

Undervoltage Threshold

VTH(PWRGD)

Output Saturation Voltage

VSAT IO = 5mA

Hysteresis

VHYS(PWRG

D)

OVER VOLTAGE PROTECTION

90

95 % VREF

0.5

V

10

mV

OVP Trip Point

Hysteresis(1)

SOFT START

VOVP

VHYS(OVP)

38 42 46 %VOUT

10

mV

Charge Current

Discharge Current

INHIBIT COMPARATOR

ICHG

Idischg

VSS = 0.5V, resistance from VREFB pin to

AGND = 20kΩ, VREFB = 1.3V

Note: ICHG = (IVREFB / 5)

V(S/S) = 1V

10.4 13 15.6 µA

1

mA

Start Threshold

VIN12V UVLO

VstartINH

1 2.0 2.4 V

Start Threshold

Hysteresis

VstartUVLO

VhysUVLO

9.25 10 10.75 V

1.8 2 2.2 V

4

© 2000 SEMTECH CORP.

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