SC4508A データシートの表示（PDF） - Semtech Corporation
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SC4508A Datasheet PDF : 21 Pages
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SC4508A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VDD = 12V, VFB+ = VREF, VFB- = 0, OUT = open, CVDD = 1uF, CSS/EN = 0.1uF, COSC = 330pF. TA = TJ = -40°C to 125°C
Parameter
Test Conditions
Min
Typ
Max
Unit
PWM Comparator
Maximum Duty Cycle
C = 1.5nF, 100kHz
97
%
C = 100pF, 1.5MHz
95
%
Minimum On Time
200
nS
Slope Compensation
63
mV/Ts
Delay to Output
50
ns
VREF Reference
Output Voltage
0.4925
0.5
0.5075
V
Output Voltage
Output Current
TA = 25°C, VDD = 5V
0.496
0.5
0.504
V
1
mA
Line Regulation
Load Regulation
Soft Start/Enable/Shutdown
VDD = 2.7 to 15V, IVREF = 1mA
VDD = 5V, IVREF = 0 to 1mA
5
10
mV
2
4
mV
Charge Current
Discharge Current
VSS/EN > 0.9V
VSS/EN < 0.9V
20
µA
10
12
mA
Enable Logic Voltage
2
V
SHDN Logic Voltage
0.35
V
Current Limit
Cycle by Cycle Threshold
Consecutive Overcurrent
Clock Cycles before Auto
Restart Shutdown
VDD = 5V
90
110
130
mV
32
Delay to Output
50
nS
Output
Gate Drive On-Resistance(H)
8
Ohm
Gate Drive On-Resistance(L)
8
Ohm
Gate Drive On-Resistance(H)
Gate Drive On-Resistance(L)
Rise Time
Fall Time
2007 Semtech Corp.
VDD = 5V
VDD = 5V
COUT = 1000pF
COUT = 1000pF
3
15
Ohm
15
Ohm
20
nS
20
nS
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