Datasheet

TPS54294
SLVSB00D –OCTOBER 2011–REVISED SEPTEMBER 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over recommended free-air temperature range, VIN = 12 V (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
POWER GOOD
PG from lower VOx (going high) 84%
V
PGTH
PGx threshold
PG from higher VOx (going low) 116%
R
PG
PGx pull-down resistance VPGx = 0.5 V 50 75 110 Ω
Delay for PGx going high 1.5 ms
T
PGDLY
PGx delay time
Delay for PGx going low 2 µs
T
PGCOMPSS
PGx comparator start-up delay PGx comparator wake-up delay 1.5 ms
UVLO
VREG5 rising 3.83
V
UVREG5
VREG5 UVLO threshold V
Hysteresis 0.6
LOGIC THRESHOLDs
V
ENH
ENx H-level threshold voltage 2.0 V
V
ENL
ENx L-level threshold voltage 0.4 V
R
ENx_IN
ENx input resistance ENx = 12 V 225 450 900 kΩ
CURRENT LIMITs
I
OCL
Current limit L
OUT
= 2.2 µH
(3)
2.7 3.9 4.5 A
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION (UVP, OVP)
V
OVP
Output OVP trip threshold measured on VFBx 115% 120% 125%
T
OVPDEL
Output OVP prop delay 3 10 µs
V
UVP
Output UVP trip threshold measured on VFBx 63% 68% 73%
T
UVPDEL
Output UVP delay time 1.5 ms
T
UVPEN
Output UVP enable delay 1.5 ms
THERMAL SHUTDOWN
Shutdown temperature
(3)
155
T
SD
Thermal shutdown threshold °C
Hysteresis
(3)
25
(3) Specified by design. Not production tested.
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