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SC1402

Multi-Output, Low-Noise Power Supply Controller for Notebook Computers

Semtech Corporation 

Multi-Output, Low-Noise Power Supply

Controller for Notebook Computers

SC1402

December 15, 2000

ABSOLUTE MAXIMUM RATINGS

PARAMETERS

V+, BST3, BST5 to GND

PGND to GND

PHASE3 to BST3, and PHASE5 to BST5

VL to GND

REF,SYNC,SEQ,PSAVE,TIME_ON5,RESET to GND

RUN/ON3, SHDN to GND

VDD to GND

12 Out to GND

VL, REF Short to GND

12 Out Short to GND

REF Current

VL Current

12 Out Current

VDD Shunt Current

TS Storage Temperature

TL Lead soldering temperature

MAXIMUM

-0.3, +36

± 0.3

-6 to +0.3

-0.3 to 6

-0.3 to (VL+.3V)

-0.3 to (V+ + 0.3V)

-0.3 to +30V

-0.3 to (VDD + 0.3V)

Continuous

Continuous

+5

+50

+200

+15

-65 to +150

+300, 10 seconds

UNITS

V

V

V

V

V

V

V

V

sec.

sec.

mA

mA

mA

mA

°C

°C

ELECTRICAL CHARACTERISTICS(1)

(Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, PSAVE = 0V, TA =-40 to +85°C.

Typical values are at TA = +25°C).

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

MAIN SMPS CONTROLLERS

Input Voltage Range

6.0

30.0

V

3V Output Voltage in

V+ = 6V to 30V, CSH3-CSL3 = 0V,

2.45 2.5 2.55

V

Adjustable Mode

CSL3 tied to FB3

3V Output Voltage in Fixed Mode V+ = 6V to 30V, 0mV < CSH3-CSL3 < 80mV, 3.17 3.3 3.43

V

FB3 = 0V

5V Output Voltage in Adjustable V+ = 6V to 30V, CSH5-CSL5 = 0V,

2.45 2.5 2.55

V

Mode

CSL5 tied to FB5

5V Output Voltage in Fixed Mode V+ = 6V to 30V, 0mV < CSH5-CSL5 < 80mV, 4.82 5.0 5.18

V

FB5 = 0V

Output Voltage Adjust Range

Either SMPS

REF

5.5

V

Adjustable-Mode Threshold

Voltage

Load Regulation

Dual Mode comparator

0.5

1.3

V

Either SMPS, 0V < CSH_-CSL_ < 80mV

-0.8

%

Line Regulation

Either SMPS, 6V < V+ < 30V

0.03

%/V

Current-Limit Threshold

PSAVE Mode Threshold

CSH3-CSL3 or CSH5-CSL5

PSAVE = VL or V12OUT < 11.9V

PSAVE = 0V, not tested

80 100 120

-50 -100 -150 mV

10

25

40

mV

Soft-Start Ramp Time

Oscillator Frequency

Maximum Duty Factor

From enable to 95% full current limit with

512

clks

respect to fOSC Note 2.

SYNC = VL

270 300 330 kHz

SYNC = 0V

170 200 235

SYNC = VL

94

%

SYNC = 0V

96

2

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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