SC1401 datasheet(5/17 Pages) SEMTECH

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SC1401

652 MITCHELL ROAD

NEWBURY PARK CA 91320

HIGH PERFORMANCE SYNCHRONOUS BUCK

CONTROLLER WITH LDO FOR PORTABLE

POWER

November 21, 2000

ELECTRICAL CHARACTERISTICS (continued)

Unless specified: VDD1 = 12V, VDD2 = 12V V5V = 5V, SHDN = PSAVE = 5V, TA = -40 °C to +85 °C. Typical values are at TA = +25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

FAULT DETECTION

Thermal Shutdown Threshold

Typical hysteresis = +10°V

150

°C

VDD1 Undervoltage Reset

Threshold

Falling edge of VDD1, hysteresis = 1%

4.2

4.5

4.8

V5V Undervoltage Reset

Threshold

Falling edge of V5V, hysteresis = 1%

3.75

4.0

4.25

FB Overvoltage Reset

Threshold

With respect to unloaded output voltage, typ.

Hysteresis = 1%

FB Undervoltage Reset

Threshold

With respect to unloaded output voltage, typ.

Hysteresis = 1%

-10

RESET Propagation Delay

FB Over/Under Voltage condition

1.5

µs

IOS Undervoltage Reset

Threshold

With respect to unloaded linear output voltage

-10

RESET Delay Time

With respect to fOSC

27,000 32,000 37,000

clks

Logic Input High

SHDN,ENABLEIO

1.8

Logic Input Low

PSAVE,SYNC

1.6

Input Leakage Current

SHDN,ENABLEIO, PSAVE, SYNC

-1.0

1.0

µA

Logic Output Low Voltage

RESET, ISINK = 4mA

0.4

LOGICAL INPUTS AND OUTPUTS

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