Datasheet

TPS74401-EP
SBVS122B –MARCH 2010–REVISED SEPTEMBER 2010 www.ti.com
ELECTRICAL CHARACTERISTICS
At V
EN
= 1.1 V, V
IN
= V
OUT
+ 0.3 V, C
IN
= C
BIAS
= 0.1 mF, C
OUT
= 10 mF, I
OUT
= 50 mA, V
BIAS
= 5.0 V,
and T
J
= –55°C to +125°C, unless otherwise noted. Typical values are at T
J
= +25°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage range V
OUT
+ V
DO
5.5 V
V
BIAS
Bias pin voltage range 2.375 5.25 V
V
REF
Internal reference (Adj.) 0.792 0.808 V
Output voltage range V
IN
= 5 V, I
OUT
= 1.5 A, V
BIAS
= 5 V V
REF
3.6 V
V
OUT
2.97 V ≤ V
BIAS
≤ 5.25 V,
Accuracy
(1)
–1 ±0.2 +1 %
50 mA ≤ I
OUT
≤ 3.0 A
V
OUT
/V
IN
Line regulation V
OUT (NOM)
+ 0.3 ≤ V
IN
≤ 5.5 V 0.0005 0.05 %/V
0mA ≤ I
OUT
≤ 50 mA 0.013 %/mA
V
OUT
/I
OUT
Load regulation
50 mA ≤ I
OUT
≤ 3.0 A 0.03 %/A
V
IN
dropout voltage
(2)
I
OUT
= 3.0 A, V
BIAS
– V
OUT (NOM)
≥ 1.62 V 120 195 mV
V
DO
V
BIAS
dropout voltage
(2)
I
OUT
= 3.0 A, V
IN
= V
BIAS
1.62 V
I
CL
Current limit V
OUT
= 80% × V
OUT (NOM)
3.7 6.0 A
I
BIAS
Bias pin current I
OUT
= 0 mA to 3.0 A 2 4 mA
Shutdown supply current
I
SHDN
V
EN
≤ 0.4 V 0.4 1 mA
(V
IN
)
I
FB
Feedback pin current
(3)
I
OUT
= 50 mA to 3.0 A –250 95 250 nA
1 kHz, I
OUT
= 1.5 A, V
IN
= 1.8 V,
73
V
OUT
= 1.5 V
Power-supply rejection
dB
(V
IN
to V
OUT
)
800 kHz, I
OUT
= 1.5 A, V
IN
= 1.8 V,
42
V
OUT
= 1.5 V
PSRR
(4)
1 kHz, I
OUT
= 1.5 A, V
IN
= 1.8 V,
62
V
OUT
= 1.5 V
Power-supply rejection
dB
(V
BIAS
to V
OUT
)
800 kHz, I
OUT
= 1.5 A, V
IN
= 1.8 V,
50
V
OUT
= 1.5 V
100 Hz to 100 kHz, I
OUT
= 1.5 A,
Noise Output noise voltage 16 × V
OUT
mV
RMS
C
SS
= 0.001 mF
%V
OUT
droop during load I
OUT
= 100 mA to 3.0 A at 1 A/ms,
V
TRAN
4 %V
OUT
transient C
OUT
= 0 mF
t
STR
Minimum startup time I
OUT
= 1.5 A, C
SS
= open 100 ms
I
SS
Soft-start charging current V
SS
= 0.4 V 0.5 0.73 1 mA
V
EN, HI
Enable input high level 1.1 5.5 V
V
EN, LO
Enable input low level 0 0.4 V
V
EN, HYS
Enable pin hysteresis 50 mV
V
EN, DG
Enable pin deglitch time 20 ms
I
EN
Enable pin current V
EN
= 5 V 0.1 1 mA
V
IT
PG trip threshold V
OUT
decreasing 86 90 93.5 %V
OUT
V
HYS
PG trip hysteresis 3 %V
OUT
V
PG, LO
PG output low voltage I
PG
= 1 mA (sinking), V
OUT
< V
IT
0.3 V
I
PG, LKG
PG leakage current V
PG
= 5.25 V, V
OUT
> V
IT
0.03 1 mA
Operating junction
T
J
–55 +125 °C
temperature
Shutdown, temperature increasing +155
Thermal shutdown
T
SD
°C
temperature
Reset, temperature decreasing +140
(1) Adjustable devices tested at 0.8 V; external resistor tolerance is not taken into account.
(2) Dropout is defined as the voltage from the input to V
OUT
when V
OUT
is 2% below nominal.
(3) I
FB
current flow is out of the device.
(4) See Figure 10 to Figure 13 for PSRR at different conditions.
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