SC1480
POWER MANAGEMENT
Electrical Characteristics Cont.
Test Conditions: VIN = 2.5V, REFIN = 1.25, VCCA = VDDP = 5.0V, VOUT = 1.25V, RTON = 1M (300kHz), 0.1% Resistor Dividers
Parameter
Conditions
25°C
-40°C to 125°C
Units
Min
Typ
Max
Min
Max
On-Time
R
TON = 1M (300kHz)
1660
1411
1909
ns
ns
VIN = 2.5V
RTON = 500K (600kHz)
VIN = 2.5V
913
776
1050
550
Minimum Off Time
400
ns
Line Regulation Error
VCCA, VDDP = 4.5V to 5.5V
Vin = 4.5V to 25V
0.04
%/V
Load Regulation Error
FBK Input Resistance
Over-Current Sensing
ILIM Sink Current
ILIM - PGND = 0V to 0°C Limit
0.3
%
500
kΩ
10
9
11
5
µA
Current Comparator Offset
Reference Buffer
PGND - ILIM
-5
mV
REFOUT Source Current
REFIN Enable Threshold
REFIN Hysteresis
3
mA
V
0.8
40
0.55
1.0
mV
mV
mV
Offset Voltage
REFOUT current = 0mA
REFOUT current = 3mA
-10
10
-12.5
12.5
Fault Protection
Current Limit (Positive)(2)
PGND-LX, RILIM = 5k
PGND-LX, RILIM = 10k
PGND-LX, RILIM = 20k
PGND-LX
50
100
200
-140
-20
40
90
60
110
220
-100
-15
mV
mV
mV
mV
%
180
-200
-28
+8
Current Limit (Negative)
Output Under-Voltage Fault
Output Over-Voltage Fault
Over-Voltage Fault Delay
PGOOD Low Output Voltage
PGOOD Leakage Current
PGOOD UV Threshold
With respect to REFOUT
With respect to REFOUT
FBK forced above OV Vth
Sink 1mA
+10
2.0
+12
%
µs
V
0.4
1
FBK in regulation, PGOOD = 5V
With respect to REFOUT
µA
%
-10
-12
-8
2006 Semtech Corp.
3
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SEMTECH [ SEMTECH CORPORATION ]
