Datasheet

TPS54294
www.ti.com SLVSB00D –OCTOBER 2011–REVISED SEPTEMBER 2013
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VALUES
UNIT
MIN MAX
Supply input voltage range VIN1, VIN2 4.5 18 V
VBST1, VBST2 –0.1 24
VBST1, VBST2 (10ns transient) –0.1 27
VBST1–SW1, VBST2–SW2 –0.1 5.7
Input voltage range VFB1, VFB2 –0.1 5.7 V
EN1, EN2 –0.1 18
SW1, SW2 –1.0 18
SW1, SW2 (10ns transient) –3 21
VREG5, PG1 , PG2 –0.1 5.7
Output voltage range PGND1, PGND2 –0.1 0.1 V
VO1, VO2 0.76 7.0
T
A
Operating free-air temperature –40 85 °C
T
J
Operating Junction Temperature –40 150 °C
ELECTRICAL CHARACTERISTICS
(1)
over recommended free-air temperature range, VIN = 12 V (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
EN1 = EN2 = 5 V,
I
IN
VIN supply current 1300 2500 µA
VFB1 = VFB2 = 0.8 V
I
VINSDN
VIN shutdown current EN1 = EN2 = 0 V 80 200 µA
FEEDBACK VOLTAGE
V
VFBTHLx
VFBx threshold voltage CH1 = 3.3 V, CH2 = 1.5 V 758 765 773 mV
TC
VFBx
Temperature coefficient On the basis of 25°C
(2)
–115 115 ppm/℃
I
VFBx
VFB Input Current VFBx = 0.8 V –0.35 0.2 0.35 µA
VREG5 OUTPUT
6 V < VIN1 < 18 V,
V
VREG5
VREG5 output voltage 5.5 V
I
VREG
= 5 mA
I
VREG5
Output current VIN1 = 6 V, VREG5 = 4 V
(2)
75 mA
MOSFETs
r
DS(on)H
High side switch resistance VBSTx-SWx = 5.5 V
(2)
150 mΩ
r
DS(on)L
Low side switch resistance
(2)
100 mΩ
ON-TIME TIMER CONTROL
T
ON1
SW1 On Time SW1 = 12 V, VO1 = 1.2 V 165 ns
T
ON2
SW2 On Time SW2 = 12 V, VO2 = 1.2 V 165 ns
T
OFF1
SW1 Min off time VFB1 = 0.7 V
(2)
220 ns
T
OFF2
SW2 Min off time VFB2 = 0.7 V
(2)
220 ns
SOFT START
T
SS
Soft-start time Internal soft-start time 1.0 ms
(1) x means either 1 or 2, that is, VFBx means VFB1 or VFB2.
(2) Specified by design. Not production tested.
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: TPS54294