SC2440A Datasheet, PDF (4/28 Pages) Semtech Corporation – Dual 30V Step-Down Switching Regulator with 2A Switches

SC2440A
Electrical Characteristics (continued)
Parameter
Conditions
Oscillator and Synchronization
Channel Free-running Frequency
Minimum Switch Off-time
SYNC Input High Voltage
SYNC Input Low Voltage
SYNC Pin Input Current
Power Switch
Switch Current Limit⁽¹⁾
Switch Saturation Voltage
Switch Leakage Current
Switch Minimum Bootstrap Voltage
BST Pin Current
Soft-start and Hiccup Overload Protection
V_SYNC = 2V
I_SW1 = -2A
I_SW1 = -2A
I_SW1 = -0.5A
I_SW1 = -2A
Shutdown SS Threshold
Soft-start Charging Current
Soft-start Discharging Current
SS Switching Threshold
Hiccup Arming SS Voltage
Hiccup Retry SS Voltage
FB Overload Threshold
Output Power Good Indicators
PGOOD Threshold Below FB
PGOOD Output Low Voltage
PGOOD Pin Leakage Current
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V_SS1 = V_SS2
V_SS = 0
V_SS Rising and V_SS = 1.5V
In Overload Shutdown, V_SS Falling and V_SS = 1.5V
V_FB = 0, V_COMP = 1.3V, V_SS Rising
V_SS Rising
V_SS Falling
V_SS = 2.3V, V_FB Falling
V_FB Rising
V_FB = 0.8V, I_PGOOD = 250µA
V_PGOOD = 5V
T_J Rising
Notes:
(1) Switch current limits do not vary with duty cycle.
Min Typ Max Units
1.2 1.4
1.6 MHz
90
140
ns
2
V
0.8
V
60
75
µA
2.0 2.6
3.8
A
300
460
mV
10
µA
1.8
2.4
V
20
30
mA
50
80
mA
0.15 0.25 0.35
V
1.8
µA
1.0 1.8
2.6
µA
0.8
µA
1.21
V
2.1
V
0.7 1.0
1.3
V
0.72
V
80
100
120
mV
0.2
0.4
V
0.1
1
µA
160
°C
18
°C