SC1402

© 2000 SEMTECH CORP.

652 MITCHELL ROAD

NEWBURY PARK CA 91320

Multi-Output, Low-Noise Power Supply

Controller for Notebook Computers

December 15, 2000

3

Table 2

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

SYNC Input High Pulse

2

300

SYNC Input Low Pulse Width

2

300

ns

SYNC Rise/Fall Time

2

200

SYNC Input Frequency Range

240

350

kHz

Current-Sense Input Leakage

Current

V+ = VL = 0V,

CSL3 = CSH3 = CSL5 = CSH5 = 5.5V

0.01

10

µA

FLYBACK CONTROLLER

VDD Shunt Threshold

Rising edge, hysteresis = 1%

18

20

V

VDD Shunt Sink Current

VDD = 20V

5

10

30

mA

VDD Leakage Current

VDD = 5V , Standby mode

30

µA

12V LINEAR REGULATOR

12OUT Output Voltage

0mA < Load < 120mA

11.55

12.1 12.50

V

12OUT Current Limit

12OUT forced to 11V, VDD = 13V

150

mA

12OUT Regulation Threshold

Falling edge

11.9

V

Quiescent VDD Current

VDD = 18V, run mode, no 12OUT load

50

100

µA

INTERNAL REGULATOR AND REFERENCE

VL Output Voltage

SHDN = V+, 6V < V+ < 30V, 0mA < ILOAD <

50mA, RUN/ON3 = TIME/ON5 = 0V

4.6

5.2

Undervoltage Fault Lockout

Threshold

Falling edge, hysteresis = 0.9V

3.5

3.7

4.0

V

Switchover Threshold

Switch over at startup

4.5

REF Output Voltage

No external load, Standby Mode

2.45

2.5

2.55

REF Load Regulation

0µA < LOAD < 50µA

12.5

mV

0mA < LOAD < 5mA

50

REF Sink Current

10

µA

REF Fault Lockout Voltage

Falling edge

1.8

2.2

V

V+ Operating Supply Current

VL switched over to CSL5, 5V SMPS on

10

50

V+ Standby Supply Current

V+ = 6V to 30V, SMPS off, includes current into

SHDN

180

µA

V+ Shutdown Supply Current

V+ = 6V to 30V, SHDN = 0V

4

20

Quiescent Power Consumption

SMPS enabled, FB3 = FB5 = 0V,

CSL3 = CSH 3 = 3.5V, CSL5 = CSH5 = 5.5V

7.5

mW