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SC1545 Datasheet PDF : 8 Pages
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500mA SmartLDOTM With Power Up
Signal Sequencing
SC1545
PRELIMINARY - January 17, 2000
ELECTRICAL CHARACTERISTICS (Cont.)
Unless specified, 12VIN = 12V, 5VSTBY = 5V, CO = 100µF min., TA = 25°C. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
MIN TYP MAX Units
VO
LDO Output Voltage
VO
4.7V ≤ 5VSTBY ≤ 5.3V,
-1.5% 2.525 +1.5% V
LDO Output Voltage During
Load Transients(1)
Time To Regulation(2)
Inputs (BF_CUT & SLP)
VO(T)
tREG
1mA ≤ IO ≤ 500mA
-2.5%
+2.5%
Load step between 0mA and 500mA at -3.0% 2.525 +3.0% V
8A/µs max.
5
µs
Input Resistance
RIN
BF_CUT = SLP = 5V
1.0 10.0
MΩ
High Level Input Voltage
VIH
Low Level Input Voltage
VIL
NDR
2.0
V
0.8 V
Peak Drive Current
INDR(PK)
Sinking: NDR = 0.5V
30
mA
Sourcing: NDR = 10V
Output Voltage
Drive Low Delay
VNDR
tDL(N)
Full ON, INDR = 100µA
10 12
V
Measured from BF_CUT threshold to
90% of NDR
150 ns
Fall Time
Drive High Delay
tf(N)
tDH(N)
Measured from 90% to 10%
Measured from BF_CUT/SLP threshold
to 10% of NDR
1.0 µs
300 ns
Rise Time
PDR
tr(N)
Measured from 10% to 90%
1.0 µs
Peak Drive Current
IPDR(PK)
Sinking: PDR = 0.5V
30
mA
Sourcing: PDR = 3.5V
Output Voltage
Drive Low Delay
VPDR
tDL(P)
Full ON, IPDR = 100µA
3.5 5
V
Measured from BF_CUT threshold to
90% of PDR
150 ns
Fall Time
Drive High Delay
tf(P)
tDH(P)
Measured from 90% to 10%
Measured from BF_CUT/SLP threshold
to 10% of PDR
1.0 µs
300 ns
Rise Time
tr(P)
Measured from 10% to 90%
Overcurrent Protection
1.0 µs
Current Limit Threshold
ICL
VO = 0V
550
mA
NOTES:
(1) The LDO will bring the output back to within the regular VO limits in less than 10µs.
(2) External 2.5V ± 2.5% applied at output, turning off when NDR goes low. CO = 100µF to 400µF, IO = 50mA to
200mA.
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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