Datasheet

TPS22946
SLVS984A –SEPTEMBER 2009–REVISED FEBRUARY 2010 www.ti.com
SWITCHING CHARACTERISTICS
V
IN
= 1.8 V, R
L
= 50 Ω, CL = 1 mF, T
A
= –40°C to 85°C, TYP values at T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
PWRON
Power-ON time R
L
= 50 Ω, C
L
= 1 mF 192 ms
t
PWROFF
Power-OFF time R
L
= 50 Ω, C
L
= 1 mF 0.55 ms
t
ON
Turn-ON time R
L
= 50 Ω, C
L
= 1 mF 125 ms
t
OFF
Turn-OFF time R
L
= 50 Ω, C
L
= 1 mF 115 ms
t
R
V
OUT
rise time R
L
= 50 Ω, C
L
= 1 mF 35 ms
t
F
V
OUT
fall time R
L
= 50 Ω, C
L
= 1 mF 120 ms
t
BLANK
Over-current blanking time 7 10 15 ms
t
RSTART
Auto-restart time 50 70 95 ms
t
TIMEOUT
Over-current detection timeout
(1)
V
IN
= V
ON
= 3.3 V, hard short
(2)
6000 ms
Over-temperature detection maximum
t
OVRTMP
7.7 ms
response time
V
IN
= V
ON
= 1.8 V, Moderate over-current
63.5
condition
(3)
Moderate over-current detection
t
MODOC
ms
maximum response time
V
IN
= V
ON
= 3.3 V, Moderate over-current
65.5
condition
(3)
V
IN
= V
ON
= 1.8 V, hard short
(2)
270
t
HARDSHOR
Hard-short detection maximum
ms
T
response time
V
IN
= V
ON
= 3.3 V, hard short
(2)
295
(1) See the Automatic Disable in Case of Permanent Over Current section in Application Information.
(2) Hard short check is performed at the output voltage of the switch. Hard short condition is active when V
OUT
< 2/3 V
IN
. Please refer to
application information.
(3) If the current going through the switch is above I
LIM
, then the moderate over-current condition is activated
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