SC4524D Datasheet, PDF (4/21 Pages) Semtech Corporation – 18V 2A Step-Down Switching Regulator 2A Output Current

Electrical Characteristics (Cont.)
Unless otherwise noted, V_IN = 12V, V_BST = 15V, V_SS = 2.2V, -40°C < T_J < 125°C, R_OSC = 12.1kΩ.
Parameter
Conditions
Minimum Switch On-time
Minimum Switch Off-time
Switch Leakage Current
Minimum Bootstrap Voltage
BST Pin Current
Oscillator
I_SW = -2.6A
I_SW = -2.6A
Switching Frequency
Foldback Frequency
Soft Start and Overload Protection
R_OSC = 12.1kΩ
R_OSC = 73.2kΩ
R_OSC = 12.1kΩ, V_FB = 0
R_OSC = 73.2kΩ, V_FB = 0
SS/EN Shutdown Threshold
SS/EN Switching Threshold
Soft-start Charging Current
Soft-start Discharging Current
V_FB = 0 V
V_SS/EN = 0 V
V_SS/EN = 1.5 V
Hiccup Arming SS/EN Voltage
Hiccup SS/EN Overload Threshold
Hiccup Retry SS/EN Voltage
Over Temperature Protection
V_SS/EN Rising
V_SS/EN Falling
V_SS/EN Falling
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Note 1: Switch current limit does not vary with duty cycle.
SC4524D
Min
Typ
Max Units
135
ns
100
ns
10
µA
1.8
2.3
V
60
95
mA
1.04
1.3
1.56
MHz
230
300
370
kHz
100
250
kHz
35
60
90
0.2
0.3
0.4
V
0.95
1.2
1.4
V
1.9
µA
1.6
2.4
3.2
1.5
µA
2.15
V
1.9
V
0.6
1.0
1.2
V
165
°C
10
°C