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SC1154

Programmable Synchronous DC/DC Hysteretic Controller for Advanced Processors

Semtech Corporation 

SC1154

POWER MANAGEMENT

DC Electrical Characteristics (Cont.)

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

Parameter

Symbols Conditions

Reference/Voltage Identification

Reference Voltage Accuracy

VREF 11.4V < VIN12V< 12.6V, over full

VID range (see Output Voltage

Table)

VIDO - VID4 High Threshold

Voltage

V

TH(H)

VIDO - VID4 Low Threshold Voltage

Power Good

VTH(L)

Undervoltage Threshold

Output Saturation Voltage

Hysteresis

Over Voltage Protection

VTH(PWRGD)

VSAT

IO = 5mA

VHYS(PWRGD)

OVP Trip Point

Hysteresis (1)

Soft Start

VOVP

VHYS(OVP)

Charge Current

Discharge Current

ICHG

Idischg

VSS = 0.5V, resistance from VREFB

pin to AGND = 20kΩ, VREFB = 1.3V

Note: ICHG = (IVREFB / 5)

V(S/S) = 1V

Min

-1

2.25

90

12

10.4

PRELIMINARY

Typ Max Units

1

%

V

1

V

95 %VREF

0.5

V

10

mV

15

20 %VOUT

10

mV

13 15.6 µA

1

mA

Inhibit Comparator

Start Threshold

VIN 12V UVLO

Start Threshold

Hysteresis

Hysteretic Comparator

Input Offset Voltage

Input Bias Current

Hysteresis Accuracy

Hysteresis Setting

Vstart(NH)

VstartUVLO

VhysUVLO

VosHYSCMP VDROOP pin grounded

IbiasHYSCMP

VHYS ACC

VHYS SET

1 2.0 2.4

V

9.25 10.25 11.25 V

1.8 2

2.2

V

5

mV

1

uA

7

mV

60 mV

 2001 Semtech Corp.

3

www.semtech.com

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