Datasheet

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ELECTRICAL CHARACTERISTICS
TPS794xx
SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005
Over recommended operating temperature range (T
J
= –40 ° C to 125 ° C), V
EN
= V
IN
, V
IN
= V
OUT(nom)
+ 1 V
(1)
, I
OUT
= 1mA,
C
OUT
= 10 µ F, C
NR
= 0.01 µ F, unless otherwise noted. Typical values are at 25 ° C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input voltage, V
IN
(1)
2.7 5.5 V
Continuous output current, I
OUT
0 250 mA
Output voltage range TPS79401 1.225 5.5 – V
DO
V
Output
TPS79401
(2)
0 µ A ≤ I
OUT
≤ 250 mA, V
OUT
+ 1 V ≤ V
IN
≤ 5.5 V
(1)
0.97(V
OUT
) V
OUT
1.03(V
OUT
) V
voltage
Accuracy
Fixed V
OUT
0 µ A ≤ I
OUT
≤ 250 mA, V
OUT
+ 1 V ≤ V
IN
≤ 5.5 V
(1)
–3.0 +3.0 %
Output voltage line regulation ( ∆ V
OUT
%/ ∆ V
IN
)
(1)
V
OUT
+ 1 V ≤ V
IN
≤ 5.5 V 0.05 0.12 %/V
Load regulation ( ∆ V
OUT
%/ ∆ I
OUT
) 0 µ A ≤ I
OUT
≤ 250 mA 10 mV
TPS79428 I
OUT
= 250 mA 155 210
Dropout voltage
(3)
TPS79430 I
OUT
= 250 mA 155 210 mV
V
IN
= V
OUT(nom)
– 0.1 V
TPS79433 I
OUT
= 250 mA 145 200
Output current limit V
OUT
= 0 V 925 mA
Ground pin current 0 µ A ≤ I
OUT
≤ 250 mA 170 220 µ A
Shutdown current
(4)
V
EN
= 0 V, 2.7 V ≤ V
IN
≤ 5.5 V 0.07 1 µ A
FB pin current V
FB
= 1.225 V 1 µ A
f = 100 Hz, I
OUT
= 250 mA 65
Power-supply ripple rejection TPS79428 f = 10 kHz, I
OUT
= 250 mA 60 dB
f = 100 kHz, I
OUT
= 250 mA 40
C
NR
= 0.001 µ F 55
C
NR
= 0.0047 µ F 36
BW = 100 Hz to 100 kHz,
Output noise voltage TPS79428 µ V
RMS
I
OUT
= 250 mA
C
NR
= 0.01 µ F 33
C
NR
= 0.1 µ F 32
C
NR
= 0.001 µ F 50
Time, start-up TPS79428 R
L
= 14 Ω , C
OUT
= 1 µ F C
NR
= 0.0047 µ F 70 µ s
C
NR
= 0.01 µ F 100
High-level enable input voltage 2.7 V ≤ V
IN
≤ 5.5 V 1.7 V
IN
V
Low-level enable input voltage 2.7 V ≤ V
IN
≤ 5.5 V 0 0.7 V
EN pin current V
EN
= 0 1 1 µ A
UVLO threshold V
CC
rising 2.25 2.65 V
UVLO hysteresis 100 mV
(1) Minimum V
IN
is 2.7 V or V
OUT
+ V
DO
, whichever is greater.
(2) Tolerance of external resistors not included in this specification.
(3) Dropout is not measured for the TPS79418 and TPS79425 since minimum V
IN
= 2.7 V.
(4) For adjustable versions, this applies only after V
IN
is applied; then V
EN
transitions high to low.
3
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