Datasheet

TPS51220A
www.ti.com SLUS897E –DECEMBER 2008–REVISED JANUARY 2013
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, V
EN
= 3.3 V, V
VIN
= 12 V, V
V5SW
= 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INTERFACE AND LOGIC THRESHOLD
Wake up 0.8 1 1.2
V
EN
EN Threshold V
Hysteresis 0.1 0.2 0.3
I
ENLK
EN leak current EN = 0 V, or EN = 3.3 V -1 1 μA
Wake up 0.45 0.50 0.55
V
EN12
EN1/EN2 Threshold V
Hysteresis 0.1 0.2 0.3
V
EN12SS
EN1/EN2 SS Start Threshold SS-ramp start threshold at external soft start 1 V
V
EN12SSEND
EN1/EN2 SS End Threshold SS-End threshold at external soft start
(3)
2 V
I
EN12
EN1/EN2 Source Current VEN1/EN2 = 0V 1.6 2 2.4 μA
Continuous 1.5
Auto Skip 1.9 2.1
V
SKIPSEL
SKIPSEL1/SKIPSEL2 Setting Voltage V
OOA Skip (min 1/8 Fsw) 3.2 3.4
OOA Skip (min 1/16 Fsw) 3.8
V
(OCL-ULV)
, Discharge ON 1.5
V
(OCL-ULV)
, Discharge OFF 1.9 2.1
V
TRIP
TRIP Setting Voltage V
V
(OCL-LV)
, Discharge OFF 3.2 3.4
V
(OCL-LV)
, Discharge ON 3.8
Current mode, OVP enable 1.5
D-CAP mode, OVP disable 1.9 2.1
V
FUNC
FUNC Setting Voltage V
D-CAP mode, OVP enable 3.2 3.4
Current mode, OVP disable 3.8
TRIP = 0 V –1 1
I
TRIP
TRIP Input Current μA
TRIP = 5 V –1 1
SKIPSELx = 0 V –0.5 0.5
I
SKIPSEL
SKIPSEL Input Current μA
SKIPSELx = 5 V –0.5 0.5
BOOT STRAP SW
V
FBST
Forward Voltage V
VREG5-VBST
, I
F
= 10 mA, T
A
= 25°C 0.10 0.20 V
I
BSTLK
VBST Leakage Current V
VBST
= 37 V, V
SW
= 32 V 0.01 1.5 μA
THERMAL SHUTDOWN
Shutdown temperature
(3)
150
T
SDN
Thermal SDN Threshold °C
Hysteresis
(3)
10
(3) Specified by design. Not production tested.
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