Datasheet

TPS2421-1
TPS2421-2
www.ti.com SLUS907H –JANUARY 2009–REVISED JANUARY 2014
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: 3 V ≤ V
VIN
≤ 18 V, EN = 0 V, PG = FLT = open, R
OUT
= open, R
RSET
= 49.9 kΩ, –40°C ≤ T
J
≤ 125°C,
No external capacitor connected to VOUT
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIN
UVLO VIN rising 2.6 2.85 2.9 V
Hysteresis 150 mV
Bias current EN = 2.4 V 25 100 μA
EN = 0 V 3.9 5 mA
VIN, VOUT
R
ON
R
VIN-VOUT
, I
VOUT
< I
LIM
, 1 A ≤ I
VOUT
≤ 4.5 A 33 50 mΩ
Power limit TPS242x V
VIN
: 12 V, C
VOUT
= 1000 μF, EN: 3 V → 0 V 3 5 7.5
V
Reverse diode
V
VOUT
> V
VIN
, EN = 5 V, I
VIN
= –1 A 0.77 1
voltage
ISET
I
VOUT
↑, I
CT
: sinking → sourcing, pulsed test
R
RSET
= 200 kΩ 0.8 1.2
0°C ≤ T
J
≤ 85°C R
RSET
= 100 kΩ 1.8 2.2
Fault current
I
SET
R
RSET
= 49.9 kΩ 3.6 4.4 A
threshold
R
RSET
= 200 kΩ 0.75 1.25
-40°C ≤ T
J
≤ 125°C R
RSET
= 100 kΩ 1.75 2.25
R
RSET
= 49.9 kΩ 3.6 4.4
R
RSET
= 200 kΩ 1.1 1.8 2.6
I
LIM
/
Ratio I
LIM
/ I
SET
R
RSET
= 100 kΩ 1.1 1.5 2.1 A
I
SET
R
RSET
= 49.9 kΩ 1.1 1.4 1.6
R
RSET
= 200 kΩ 1.1 1.8 2.4 A
I
LIM
Current limit I
VOUT
rising, V
VIN–VOUT
= 0.3 V, pulsed test R
RSET
= 100 kΩ 2.3 3 3.7 A
R
RSET
= 49.9 kΩ 4.6 5.5 6.3 A
CT
I
CT
sourcing, V
CT
= 1 V, In current limit 29 35 41
Charge/discharge
μA
current
I
CT
sinking (–2), V
CT
= 1 V, drive CT to 1 V, measure current 1 1.4 1.8
V
CT
rising 1.3 1.4 1.5
Threshold voltage V
V
CT
falling, drive CT to 1 V, measure current 0.1 0.16 0.3
ON/OFF fault duty
V
VOUT
= 0 V 2.8% 3.7% 4.6%
cycle
EN
V
EN
falling 0.8 1 1.5 V
Threshold voltage
Hysteresis 20 150 250 mV
V
EN
= 2.4 V –2.0 0 0.5
Input bias current μA
V
EN
= 0.2 V –3.0 1 0.5
Turn on propagation V
VIN
= 3.3 V, I
LOAD
= 1 A, V
EN
: 2.4 V → 0.2 V,
350 500
delay V
VOUT
: rising 90% × V
VIN
μs
Turn off propagation V
VIN
= 3.3 V, I
LOAD
= 1 A, V
EN
: 0.2 V → 2.4 V,
30 50
delay V
VOUT
: ↓ 10% × V
VIN
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