SC1403(2002) View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC1403 Datasheet PDF : 30 Pages
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SC1403
POWER MANAGEMENT
PRELIMINARY
Electrical Characteristics (Cont.)
Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C. Typical values are at
TA = +25°C. Circuit = Typical Application Circuit
Parameter
Conditions
Min Typ Max Units
Current-Limit Threshold
CSH5 -CSL5, CSH3 -CSL3
40
50 70
mV
Negative OC limit Threshold
-50
mV
Zero Crossing Threshold
CSH5 - CSL5, CSH3 - CSL; PSAVE# = 0V,
not tested
5
mV
Soft-Start Ramp Time
Oscillator Frequency
From enable to 95% full current limit with respect to
fOSC
SYNC = VL
SYNC = 0V
Maximum Duty Factor
SYNC = VL
SYNC = 0V
SYNC Input High Pulse
Not Tested
SYNC Input Low Pulse Width
Not Tested
SYNC Rise/Fall Time
Not Tested
SYNC Input Frequency Range
Current-Sense Input Leakage
Current
CSH3 = CSH5 = 5.5V
ERROR AMP
Closed Loop Gain
Closed Loop Bandwidth
Out Resistance
COMP3, COMP5
Offset Voltage
Internal FB - REF
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout
Fault Threshold
SHDN# = V+; 6V < V+ <30V;
0mA <I LOAD <50mA; ON3 = ON5 = 0V
Falling edge, hysteresis = 0.7V
VL Switchover Lockout
Switchover at startup
REF Output Voltage
No external load
REF Load Regulation
0µA < ILOAD < 50µA
0mA < ILOAD < 5mA
512
clks
220 300 380 kHz
170 200 230
92
94
%
94
96
300
ns
300
200
240
350 kHz
3
10
µA
18
V/V
8
MHz
15
25
35
kΩ
±2
mV
4.6
5.2
V
3.5 3.7 4.0
4.5
2.45 2.5 2.55
12.5 mV
50
2002 Semtech Corp.
3
www.semtech.com
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