Datasheet

TPS2458
www.ti.com SLUS916B –FEBRUARY 2009–REVISED MAY 2010
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ENABLE INPUTS
Threshold voltage, falling edge 1.2 1.3 1.4 V
Hysteresis 20 50 80 mV
Pullup current V
EN
=V
OREN
= 0 V 5 8 15
Input bias current V
EN12
= V
OREN
= 17 V 6 15 µA
Input bias current V
EN3
= 5 V 1 5
3.3 V Turn off time EN3 deasserts to V
VOUT3
< 1.0 V, C
OUT
= 0 mF 10
µs
12 V Turn off time EN12 deasserts to V
VOUT12
< 1.0 V, C
OUT
= 0 mF, C
QGATE
20
= 35 nF
POWER GOOD OUTPUTS
Low voltage Sinking 2 mA 0.14 0.25 V
Leakage current V
PG
= 17 V 1 mA
Threshold voltage PG12, falling VOUT12 10.2 10.5 10.8
V
PG3, falling VOUT3 2.7 2.8 2.9
Hysteresis PG12, measured at OUT12 130
mV
PG3, measured at OUT3 50
Deglitch time PG3 falling 50 100 150 µs
FAULT OUTPUTS
Low voltage Sinking 2 mA 0.14 0.25 V
Leakage current FLTx = 17 V 1 µA
VINT
Output voltage 0 V < I
VINT
< 50 mA 2 2.3 2.8 V
FAULT TIMER
Sourcing current V
VCTx
= 0 V, during fault –7 –10 –13 µA
Sinking current V
VCTx
= 2 V 7 10 13
Upper threshold voltage 1.3 1.35 1.4
V
Lower threshold voltage 0.33 0.35 0.37
12-V SUMMING NODE
Input referred offset 10.8 V ≤ V
SENM
≤ 13.2 V, V
SENP
= (V
SENM
+ 50 mV),
–1.5 1.5 mV
measure V
SET
–VSENM
Summing threshold V
PASS
= 15 V 0.66 0.675 0.69 V
Leakage current V
SET
=(V
SENM
– 10 mV) 1 µA
12-V CURRENT LIMIT
Current limit threshold R
SUM
= 6.8 kΩ, R
SET
= 422 Ω, increase I
LOAD
and
47.5 50 52.5 mV
measure V
SENP
– V
SENM
when V
PASS
= 15 V
Sink current in current limit I
PASS
measured at V
SUM
= 1 V and V
PASS
= 12 V 20 40 µA
Fast trip threshold Measure V
SENP
– V
SENM
80 100 120 mV
Fast turn-off delay 20 mV overdrive, C
PASS
= 0 pF, tp50-50 200 300 ns
Timer start threshold V
PASS
- V
IN
when timer starts, while V
PASS
falling due to
5 6 7 V
overcurrent
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