Datasheet

TPS78915, TPS78918, TPS78925, TPS78928, TPS78930
ULTRALOW-POWER LOW-NOISE 100-mA
LOW-DROPOUT LINEAR REGULATORS
SLVS300A – SEPTEMBER 2000 – REVISED MAY 2001
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range,
V
I
= V
O(typ)
+ 1 V, I
O
= 1 mA, EN = 0 V, C
o
= 4.7 µF (unless otherwise noted) (continued)
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
High level enable input voltage 2.7 V < V
I
< 10 V 1.7 V
Low level enable input voltage 2.7 V < V
I
< 10 V 0.9 V
Power supply ripple rejection (TPS78930)
f = 1 kHz, C
o
= 10 µF,
T
J
= 25°C, C
(byp)
= 0.01 µF
85 dB
In
p
ut current (EN)
EN = 0 V –1 0 1 µA
Input
current
(EN)
EN = V
I
–1 1 µA
I
O
= 50 mA, T
J
= 25°C 60
TPS78928
I
O
= 50 mA, T
J
= –40°C to 125°C 125
TPS78928
I
O
= 100 mA, T
J
= 25°C 122
Dro
p
out voltage (see Note 6)
I
O
= 100 mA, T
J
= –40°C to 125°C 245
mV
Dropout
voltage
(see
Note
6)
I
O
= 50 mA, T
J
= 25°C 57
mV
TPS78930
I
O
= 50 mA, T
J
= –40°C to 125°C 115
TPS78930
I
O
= 100 mA, T
J
= 25°C 115
I
O
= 100 mA, T
J
= –40°C to 125°C 230
NOTE 6. IN voltage equals V
O
(typ) – 100 mV; The TPS78930 output voltage is set to 2.9 V. The TPS78915, TPS78918, and TPS78925 dropout
voltage is limited by the input voltage range limitations.
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
V
O
Out
p
ut voltage
vs Output current 1, 2, 3
V
O
Output
voltage
vs Junction temperature 4, 5, 6
Ground current vs Junction temperature 7
Output spectral noise density vs Frequency 8 – 10
Root mean squared output noise vs Bypass capacitance 11
Z
o
Output impedance vs Frequency 12
V
DO
Dropout voltage vs Junction temperature 13
Ripple rejection vs Frequency 14 – 16
V
O
Output voltage, enable voltage vs Time (start-up) 17 – 19
Line transient response 20, 22
Load transient response 21, 23
Equivalent series resistance (ESR) vs Output current 24, 25