SC1402

© 2000 SEMTECH CORP.

652 MITCHELL ROAD

NEWBURY PARK CA 91320

Multi-Output, Low-Noise Power Supply

Controller for Notebook Computers

December 15, 2000

4

Note 1: This device is ESD sensitive. Use of standard ESD handling precautions is required.

Note 2: Guaranteed by design.

ELECTRICAL CHARACTERISTICS (continued)

(Unless otherwise noted: (V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, PSAVE = 0V, T

Typical values are at T

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

FAULT DETECTION

Overvoltage Trip Threshold

With respect to unloaded output voltage

3.5

7

10

%

Overvoltage-Fault

Propagation Delay

CSL_ driven 2% above overvoltage trip threshold

1.5

µs

Output Undervoltage

Threshold

With respect to unloaded output voltage

60

70

80

%

Output Undervoltage

Lockout Time

From each SMPS enabled, with respect to f

OSC

5000

6144

7000

clks

Thermal Shutdown

Threshold

Typical hysteresis = +10°C

150

°C

RESET

RESET Trip Threshold

With respect to unloaded output voltage, falling

edge; typical hysteresis = 1%

-10

-7

-4

%

RESET Propagation Delay

Falling edge, CSL_ driven 2% below RESET trip

threshold

1.5

µs

RESET Delay Time

With respect to fOSC

27,000 32,000 37,000

clks

INPUTS AND OUTPUTS

Logic Input Low Voltage

RUN/ON3, PSAVE, TIME/ON5 (SEQ = REF),

SHDN, SYNC

0.6

V

Logic Input High Voltage

RUN/ON3, PSAVE, TIME/ON5 (SEQ = REF),

SHDN, SYNC

2.4

V

Input Leakage Current

RUN/ON3, PSAVE, TIME/ON5 (SEQ = REF),

SHDN, SYNC, SEQ = 0V or 3.3V

+1µA

Logic Output Low Voltage

RESET, ISINK = 4mA

0.4

V

Logic Output High Current

RESET = 3.5V

1

mA

TIME/ON5 Input Trip Level

SEQ = 0 or VL

2.4

2.6

V

TIME/ON5 Source Current

TIME/ON5 = 0V, SEQ = 0 or VL

2

3

4

µA

TIME/ON5 On-Resistance

TIME/ON5, RUN/ON3 = 0V, SEQ = 0 or VL

100

Ω

Gate Driver Sink/Source

Current

DL3, DH3, DL5, DH5, forced to 2V

1

A

Gate Driver On-Resistance

High or low

1.5

7

Ω