SC1402 데이터 시트보기 (PDF) - Semtech Corporation
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SC1402 Datasheet PDF : 18 Pages
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Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
SC1402
December 15, 2000
ELECTRICAL CHARACTERISTICS (continued)
(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
SYNC Input High Pulse2
CONDITIONS
MIN TYP MAX UNITS
300
SYNC Input Low Pulse Width2
300
ns
SYNC Rise/Fall Time2
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
VDD Shunt Sink Current
VDD Leakage Current
Rising edge, hysteresis = 1%
VDD = 20V
VDD = 5V , Standby mode
18
20
V
5
10 30 mA
30 µA
12V LINEAR REGULATOR
12OUT Output Voltage
12OUT Current Limit
12OUT Regulation Threshold
Quiescent VDD Current
0mA < Load < 120mA
12OUT forced to 11V, VDD = 13V
Falling edge
VDD = 18V, run mode, no 12OUT load
11.55 12.1 12.50 V
150
mA
11.9
V
50 100 µA
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
SHDN = V+, 6V < V+ < 30V, 0mA < ILOAD <
4.6
5.2
50mA, RUN/ON3 = TIME/ON5 = 0V
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
180
SHDN
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
Table 2
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320
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