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SC4525D Datasheet(PDF) 4 Page - Semtech Corporation

Part # SC4525D
Description  18V, 3A, 350kHz Step-Down Switching Regulator
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4525D Datasheet(HTML) 4 Page - Semtech Corporation

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© 2011 Semtech Corp.
www.semtech.com
SC4525D
4
Parameter
Conditions
Min
Typ
Max
Units
Minimum Switch On-time
150
ns
Minimum Switch Off-time
100
150
ns
Switch Leakage Current
10
µA
Minimum Bootstrap Voltage
I
SW = -3.9A
1.8
2.3
V
BST Pin Current
I
SW = -3.9A
100
150
mA
Oscillator
Switching Frequency
R
SET = 60.4kΩ
275
350
425
kHz
Foldback Frequency
R
SET = 60.4kΩ, VFB = 0
35
65
100
kHz
Soft Start and Overload Protection
SS/EN Shutdown Threshold
0.2
0.3
0.4
V
SS/EN Switching Threshold
V
FB = 0 V
0.95
1.2
1.4
V
Soft-start Charging Current
V
SS/EN = 0 V
1.9
µA
V
SS/EN = 1.5 V
1.6
2.4
3.2
Soft-start Discharging Current
1.5
µA
Hiccup Arming SS/EN Voltage
V
SS/EN Rising
2.15
V
Hiccup SS/EN Overload Threshold
V
SS/EN Falling
1.9
V
Hiccup Retry SS/EN Voltage
V
SS/EN Falling
0.6
1.0
1.2
V
Over Temperature Protection
Thermal Shutdown Temperature
165
°C
Thermal Shutdown Hysteresis
10
°C
Note 1: Switch current limit does not vary with duty cycle.
Electrical Characteristics (Cont.)
Unless otherwise noted, V
IN = 12V, VBST = 15V, VSS = 2.2V, -40°C < TA = TJ < 125°C, RSET = 60.4kΩ.


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