Datasheet

TPS65250
www.ti.com SLVSAA3C –JUNE 2010–REVISED OCTOBER 2012
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12 V ±5%, VINB2, VINB3 = 5 V ±5%, T
J
= –40°C to 125°C, f
SW
= 1 MHz (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
= 12 V, maximum charge current
I
LDO_LIMIT
Pump and dump LDO current limit 0.2 0.4 A
supplied by V
IN
V
IN
= 12 V, V
STORAGE
= 18 V.
Time to charge storage capacitor to VIN
t
PRECHARGE
R
BST
= 10 Ω, C
BST
= 20 nF, 100 ms
with IPRECHARGE_LIMIT
C
STORAGE
= 1000 µF
V
IN
= 12 V, V
STORAGE
= 18 V.
Time to charge storage capacitor from VIN
t
CHARGE
R
BST
= 10 Ω, C
BST
= 20 nF, 100 ms
to final charge value
C
STORAGE
= 1000 µF
V
STORAGE
Storage Voltage range 30 V
V
BST_PD
Bootstrap pin range 30 V
V
LDOPD
Pump and dump LDO pin range 0 20 V
V
LDOPD
Dying gasp Release voltage V
IN
= 9 V to 15 V range -5% 10.5 5% V
Storage voltage must be smaller
V
STORAGE
Dying gasp Storage voltage -5% 20.1 5% V
than ~2V
IN
- 1.5 V.
THERMAL SHUTDOWN
T
TRIP_OTS
Thermal shut down trip point Rising temperature 160 °C
Device re-starts when
T
HYST
Thermal shut down hysteresis 20 °C
T
J
< (T
TRIP_OTS
- T
HYST
)
T
TRIP_DEGLITCH
Thermal shut down deglitch 110 µs
CURRENT LIMIT PROTECTION
RLIM
1
Limit resistance range Buck 1 75 300 kΩ
RLIM
2&3
Limit resistance range Bucks 2 and 3 100 300 kΩ
V
IN
= 12 V, f
SW
= 500 kHz,
ILIM
1
Buck 1 adjustable current limit range 1.2 5.5 A
see Figure 33
V
IN
= 12 V, f
SW
= 500 kHz,
ILIM
2
Buck 2 adjustable current limit range 1 4.1 A
see Figure 34
V
IN
= 12 V, f
SW
= 500 kHz,
ILIM
3
Buck 3 adjustable current limit range 1.3 4.4 A
see Figure 35
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