Datasheet

TPS2458
SLUS916B –FEBRUARY 2009–REVISED MAY 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNITS
12-V UVLO
UVLO rising IN12 rising 8.1 8.5 8.9
V
UVLO hysteresis IN12 falling 0.44 0.5 0.59
12-V BLOCKING
Turn-on threshold Measure V
SENP
– V
VOUT
5 10 15
mV
Turn-off threshold Measure V
SENP
– V
VOUT
–6 –3 0
Turn-off delay 20-mV overdrive, C
BLK
= 0 pF, t
P50-50
200 300 ns
12-V GATE DRIVERS (PASS, BLK)
Output voltage V
VIN12
= V
VOUT12
= 10 V 21.5 23 24.5 V
Sourcing current V
VIN12
= V
VOUT12
= 10 V, V
PASS
= V
BLK
= 17 V 20 30 40 µA
Sinking current Fast turnoff, V
PASS
= V
BLK
= 14 V 0.5 1 A
4 V ≤ V
PASS
= V
BLK
≤ 25 V 6 14 25 mA
Pulldown resistance In OTSD ( at 150°C ) 14 20 26 kΩ
Fast turn-off duration 5 10 15 µs
Safety gate pulldown IRF3710, slew S or D 15 V in 1mS 1.25 V
Disable delay EN12 pin to PASS and BLK, t
P50-90
1 µs
Startup time IN12 rising to PASS and BLK sourcing 0.25 ms
3.3-V SUMMING NODE
Summing threshold 655 675 695 mV
3.3-V CURRENT LIMIT
On-resistance I
OUT3
= 150 mA 290 500 mΩ
Current limit R
SUM3
= 3.3 kΩ , V
VOUT3
= 0 V 170 195 225
mA
Fast trip threshold 240 300 400
Fast turn-off delay I
OUT3
= 400 mA, t
P50-50
750 1300 ns
3.3-V UVLO
UVLO rising IN3 rising 2.65 2.75 2.85 V
UVLO hysteresis IN3 falling 200 240 300 mV
Safety gate pulldown1 Slew IN3x, OUT3x 5 V in 1 ms 15 mA
SUPPLY CURRENTS
Both channels enabled I
OUT3
= 0 3.1 4
mA
Both channels disabled 2 2.8
THERMAL SHUTDOWN
Whole-chip shutdown T
J
rising, I
OUT3
= 0
140 150
temperature
3.3-V channel shutdown T
J
rising, I
OUT3
in current limit °C
130 140
temperature
Hysteresis Whole chip or 3.3-V channel 10
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