SC403B View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SC403B Datasheet PDF : 32 Pages
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SC403B
Electrical Characteristics (continued)
Parameter
Conditions
Min Typ Max Units
Logic Inputs/Outputs (continued)
EN/PSV Input for Forced Continuous Operation
Maximum level expressed in % of VDD
Minimum level
42
%
1
V
EN/PSV Input for Disabling Switcher
Maximum level
Minimum level
0.4
V
0
EN/PSV Input Bias Current
EN/PSV= VDD or AGND
-10
+10
μA
ENL Input Bias Current
FBL, FB Input Bias Current
VIN = 16V
FBL, FB = VDD or AGND
11
18
μA
-1
+1
μA
Linear Regulator (The LDO is shorted to the VDD pin internally.)
FBL Accuracy
LDO load = 10mA
0.735 0.75 0.765
V
LDO Current Limit
LDO to VOUT Switch-over Threshold (4)
Short-circuit protection, VIN = 12V, VDD < 0.75V
65
Start-up and foldback, VIN = 12V,
0.75 < VDD < 90% of final VDD value
115
mA
Operating current limit, VIN = 12V, VDD > 90% of final 135 200
VDD value
-140
+140 mV
LDO to VOUT Non-switch-over Threshold (4)
-450
+450 mV
LDO to VOUT Switch-over Resistance
VOUT = +5V
2
Ω
LDO Drop Out Voltage (5)
From VIN to VDD, VDD = +5V, ILDO = 100mA
1.2
V
Notes:
(1) VIN UVLO is programmable using a resistor divider from VIN to ENL to AGND pins. The ENL voltage is compared to an internal reference.
(2) For VFB > 0.750V for the SC403 and VFB > 0.600V
(3) For VDD less than 4.5V, the on-time may be limited by the VDD supply voltage and by the VIN. See the TON limitation and VDD supply voltage
section in the applications Information.
(4) The switch-over threshold is the maximum voltage differential between the VDD and VOUT pins which ensures that LDO will internally switch-
over to VOUT. The non-switch-over threshold is the minimum voltage differential between the LDO and VOUT pins which ensures that LDO
will not switch-over to VOUT.
(5) The LDO drop out voltage is the voltage at which the LDO output drops 2% below the no load regulation value.
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