Datasheet

TPS749xx
SBVS082G –JUNE 2007–REVISED NOVEMBER 2010 www.ti.com
ELECTRICAL CHARACTERISTICS
At T
J
= –40°C to +125°C, V
EN
= 1.1V, V
IN
= V
OUT
+ 0.3V, C
BIAS
= 0.1mF, C
IN
= C
OUT
= 10mF, C
NR
= 1nF, I
OUT
= 50mA, and
V
BIAS
= 5.0V, unless otherwise noted. Typical values are at T
J
= +25°C.
TPS74901
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 2.7 5.5 V
V
REF
Internal reference (Adj.) T
J
= +25°C 0.798 0.802 0.806 V
Output voltage range V
IN
= 5V, I
OUT
= 3.0V V
REF
3.6 V
Accuracy V
OUT
+ 2.2V ≤ V
BIAS
≤ 5.5V,
–2 ±0.5 2 %
V
OUT
(RGW package)
(1)
50mA ≤ I
OUT
≤ 3.0A
Accuracy V
OUT
+ 2.4V ≤ V
BIAS
≤ 5.5V,
–2 ±0.5 2 %
(KTW package)
(1)
50mA ≤ I
OUT
≤ 3.0A
V
OUT
/V
IN
Line regulation V
OUT (NOM)
+ 0.3 ≤ V
IN
≤ 5.5V 0.03 %/V
V
OUT
/I
OUT
Load regulation 50mA ≤ I
OUT
≤ 3.0A 0.09 %/A
I
OUT
= 3.0A,
V
IN
dropout voltage
(2)
120 280 mV
V
BIAS
– V
OUT (NOM)
≥ 3.25V
(3)
V
DO
V
BIAS
dropout voltage
(2)
I
OUT
= 3.0A, V
IN
= V
BIAS
1.31 1.75 V
V
OUT
= 80% × V
OUT (NOM)
, RGW
3.9 4.6 5.5
Package
I
CL
Current limit A
V
OUT
= 80% × V
OUT (NOM)
, KTW
3.8 4.6 5.5
Package
I
BIAS
Bias pin current 1 2 mA
Shutdown supply current
I
SHDN
V
EN
≤ 0.4V 1 50 mA
(I
GND
)
I
FB
Feedback pin current –1 0.150 1 mA
1kHz, I
OUT
= 1.5A,
60
V
IN
= 1.8V, V
OUT
= 1.5V
Power-supply rejection
dB
(V
IN
to V
OUT
)
300kHz, I
OUT
= 1.5A,
30
V
IN
= 1.8V, V
OUT
= 1.5V
PSRR
1kHz, I
OUT
= 1.5A,
50
V
IN
= 1.8V, V
OUT
= 1.5V
Power-supply rejection
dB
(V
BIAS
to V
OUT
)
300kHz, I
OUT
= 1.5A,
30
V
IN
= 1.8V, V
OUT
= 1.5V
100Hz to 100kHz,
Noise Output noise voltage 25 × V
OUT
mV
RMS
I
OUT
= 3.0A, C
SS
= 0.001mF
t
STR
Minimum startup time R
LOAD
for I
OUT
= 1.0A, C
SS
= open 200 ms
I
SS
Soft-start charging current V
SS
= 0.4V 440 nA
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
= 5V 0.1 1 mA
V
IT
PG trip threshold V
OUT
decreasing 85 90 94 %V
OUT
V
HYS
PG trip hysteresis 3 %V
OUT
V
PG, LO
PG output low voltage I
PG
= 1mA (sinking), V
OUT
< V
IT
0.3 V
I
PG, LKG
PG leakage current V
PG
= 5.25V, V
OUT
> V
IT
0.1 1 mA
Operating junction
T
J
–40 +125 °C
temperature
Shutdown, temperature increasing +165
Thermal shutdown
T
SD
°C
temperature
Reset, temperature decreasing +140
(1) Adjustable devices tested at 0.8V; resistor tolerance is not taken into account.
(2) Dropout is defined as the voltage from V
IN
to V
OUT
when V
OUT
is 3% below nominal.
(3) 3.25V is a test condition of this device and can be adjusted by referring to Figure 8 .
4 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated