Datasheet

TPS54262-Q1
SLVS996C –SEPTEMBER 2009–REVISED JUNE 2010 www.ti.com
DC ELECTRICAL CHARACTERISTICS
VIN = 7 V to 48 V, EN = VIN, T
J
= –40°C to 150°C (unless otherwise noted)
TEST PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT POWER SUPPLY
Normal mode: after initial start up 3.6 48 V
Falling threshold
8 V
(LPM disabled)
Info VIN Supply voltage on VIN
Rising threshold
Low-power mode 8.5 V
(LPM activated)
High voltage threshold
29 31 34 V
(LPM disabled)
Quiescent current, Open loop test – maximum duty cycle
PT I
q-Normal
5 10 mA
normal mode VIN = 7 V to 48 V
T
A
= 25°C 50 70 µA
I
Load
< 1 mA, VIN = 12 V
–40 < T
J
< 150°C 75 µA
Quiescent current,
PT I
q-LPM
low-power mode
T
A
= 25°C 75 µA
I
Load
< 1 mA, VIN = 24 V
–40 < T
J
< 150°C 75 µA
PT I
SD
Shutdown current EN = 0 V, device is off T
A
= 25°C, VIN = 12 V 1 4 µA
TRANSITION TIMES (LOW POWER – NORMAL MODES)
Transition delay, normal
CT t
d1
VIN = 12 V, V
Reg
= 5 V, I
Load
= 1 A to 1 mA 100 µs
mode to low-power mode
Transition delay, low-power
CT t
d2
VIN = 12 V, V
Reg
= 5 V I
Load
= 1 mA to 1 A 5 µs
mode to normal mode
SWITCH MODE SUPPLY; V
Reg
Info V
Reg
Regulator output VSENSE = 0.8 V
ref
0.9 18 V
CT VSENSE Feedback voltage V
Reg
= 0.9 V to 18 V (open loop) 0.788 0.8 0.812 V
PT R
DS(ON)
Internal switch resistance Measured across VIN and PH, I
Load
= 500 mA 500 mΩ
Switch current limit, cycle by
Info I
CL
VIN = 12 V 2.5 3.2 4.1 A
cycle
Info t
ON-Min
Duty cycle pulse width Bench CHAR only 50 100 150
ns
Info t
OFF-Min
Bench CHAR only 100 200 250
PT f
sw
Switching frequency Set using external resistor on RT pin 0.2 2.2 MHz
PT Internal oscillator frequency
f
sw
–10 10 %
tolerance
Info I
Sink
Start-up condition OV_TH = 0 V, V
Reg
= 10 V 1 mA
Info I
Limit
Prevent overshoot 0 V < OV_TH < 0.8 V, V
Reg
= 10 V 80 mA
PT: Production tested
CT: Characterization tested only, not production tested
Info: User information only, not production tested
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