Datasheet

POWER
PAD
TPS54428
DDA
HSOP8
SW
VBST
SS
VFB
GND
8
2
3
4
1
EN
VREG5
7
6
5
VIN
EN
VFB
VREG5
SS
GND
VIN
VIN
VBST
SW
SW
Exposed
Thermal
Die PAD
on
Underside
PGND
1
2
3
4
5
10
9
8
7
6
TPS54428
SLVSB42B –NOVEMBER 2011–REVISED MARCH 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, V
IN
= 12 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
THERMAL SHUTDOWN
Shutdown temperature
(2)
170
T
SDN
Thermal shutdown threshold °C
Hysteresis
(2)
35
ON-TIME TIMER CONTROL
t
ON
On time V
IN
= 12 V, V
O
= 1.05 V 150 ns
t
OFF(MIN)
Minimum off time T
A
= 25°C, V
FB
= 0.7 V 260 310 ns
SOFT START
I
SSC
SS charge current V
SS
= 0 V 4.2 6.0 7.8 μA
I
SSD
SS discharge current V
SS
= 1 V 0.1 0.2 mA
UVLO
Wake up V
REG5
voltage 3.45 3.75 4.05
UVLO UVLO threshold V
Hysteresis V
REG5
voltage 0.19 0.32 0.45
(2) Not production tested.
DEVICE INFORMATION
DRC PACKAGE
(TOP VIEW)
DDA PACKAGE
(TOP VIEW)
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