Datasheet

TPS2420
www.ti.com SLUS903E –JANUARY 2009–REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY (V
IN
)
V
UVLO
Undervoltage lockout V
IN
increasing 2.6 2.85 2.9 V
Hysteresis 150 mV
Bias current V
EN
= 2.4 V 25 100 μA
V
EN
= 0 V 3.9 5 mA
INPUT/OUTPUT
R
ON
On-resistance R
VIN-VOUT
, I
VOUT
< I
IMAX
or 33 50
mΩ
I
VOUT
< (I
SET
× 1.25), 1 A ≤ I
VOUT
≤ 4.5 A
P
LIMIT
Power limit V
IN
= 12 V, C
OUT
= 1000 μF 3 5 7.5
W
EN: 3V → 0 V
Reverse diode voltage V
OUT
> V
IN
, EN = 5 V, I
IN
= –1 A 0.77 1.0 V
FAULT CURRENT (
FLT
)
I
FLT
Fault current threshold I
VOUT
increasing, I
CT
from sinking to sourcing,
pulsed test
R
FLT
= 200 kΩ 0.8 1 1.2
A
R
FLT
= 100 kΩ 1.8 2 2.2
R
FLT
= 49.9 kΩ 3.6 4 4.4
CURRENT LIMIT (IMAX)
I
IMAX
Current limit program R
IMAX
= 100 kΩ 1.6 2 2.4
I
VOUT
↑ ,
R
IMAX
= 66.5 kΩ 2.6 3 3.4
A
V
VIN-VOUT
= 0.3 V, pulsed
R
IMAX
= 40.2 kΩ 4.6 5 5.4
test
FAULT TIMER (CT)
Charge/Discharge current I
CT
sourcing, V
CT
= 1 V, In current limit 29 35 41
μA
I
CT
sinking, V
CT
= 1 V, drive CT to 1 V, measure 1.0 1.4 1.8
current
Threshold voltage V
CT
increasing 1.3 1.4 1.5
V
V
CT
decreasing 0.1 0.16 0.3
D ON/OFF fault duty cycle V
VOUT
= 0 V 2.8% 3.7% 4.6%
ENABLE (
EN
)
Threshold voltage V
EN
decreasing 0.8 1.0 1.5 V
Hysteresis 50 150 250 mV
Input bias current V
EN
= 2.4 V (sinking) –1.5 0 0.5
μA
V
EN
= 0.2 V (sourcing) 2 1 0.5
Turn on propagation delay V
IN
= 3.3 V, I
LOAD
= 1 A, 350 500
V
EN
: 2.4 V → 0.2 V, VOUT: ↑ 90% × V
IN
μs
Turn off propagation delay V
IN
= 3.3 V, I
LOAD
= 1 A, 30 50
V
EN
: 0.2 V → 2.4V, V
OUT
: ↓ 10% × V
IN
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