Datasheet

Electrical Characteristics
LP2981
www.ti.com ......................................................................................................................................................... SLVS521F – JULY 2004 – REVISED AUGUST 2008
at specified free-air temperature range, V
IN
= V
OUT(NOM)
+ 1 V, V
ON/OFF
= 2 V, C
IN
= 1 µ F, I
L
= 1 mA, C
OUT
= 4.7 µ F
(unless otherwise noted)
LP2981A-xx LP2981-xx
PARAMETER TEST CONDITIONS T
A
UNIT
MIN TYP MAX MIN TYP MAX
I
L
= 1 mA 25 ° C – 0.75 0.75 – 1.25 1.25
Output voltage
Δ V
OUT
25 ° C – 1 1 – 2 2 %V
NOM
tolerance
I
L
= 1 mA to 100 mA
– 40 ° C to 125 ° C – 2.5 2.5 – 3.5 3.5
25 ° C 0.007 0.014 0.007 0.014
Output voltage V
IN
= (V
OUT(NOM)
+ 1 V) to
Δ V
OUT
/ Δ V
IN
%/V
line regulation 16 V
– 40 ° C to 125 ° C 0.032 0.032
25 ° C 1 3 1 3
I
L
= 0
– 40 ° C to 125 ° C 5 5
25 ° C 7 10 7 10
I
L
= 1 mA
– 40 ° C to 125 ° C 15 15
Dropout
V
IN
– V
OUT
mV
voltage
(1)
25 ° C 70 100 70 100
I
L
= 25 mA
– 40 ° C to 125 ° C 150 150
25 ° C 200 250 200 250
I
L
= 100 mA
– 40 ° C to 125 ° C 375 375
25 ° C 65 95 65 95
I
L
= 0
– 40 ° C to 125 ° C 125 125
25 ° C 80 110 80 110
I
L
= 1 mA
– 40 ° C to 125 ° C 170 170
25 ° C 200 300 200 300
I
L
= 25 mA
Ground pin
I
GND
– 40 ° C to 125 ° C 550 550 µ A
current
25 ° C 600 1000 600 1000
I
L
= 100 mA
– 40 ° C to 125 ° C 1700 1700
V
ON/OFF
< 0.3 V (OFF) 25 ° C 0.01 0.8 0.01 0.8
– 40 ° C to 105 ° C 0.05 2 0.05 2
V
ON/OFF
< 0.15 V (OFF)
– 40 ° C to 125 ° C 5 5
25 ° C 1.4 1.4
High = O/P ON
– 40 ° C to 125 ° C 1.6 1.6
ON/ OFF input
V
ON/OFF
V
voltage
(2)
25 ° C 0.5 0.5
Low = O/P OFF
– 40 ° C to 125 ° C 0.15 0.15
25 ° C 0.01 0.01
V
ON/OFF
= 0
– 40 ° C to 125 ° C – 1 – 1
ON/ OFF input
I
ON/OFF
µ A
current
25 ° C 5 5
V
ON/OFF
= 5 V
– 40 ° C to 125 ° C 15 15
Peak output
I
OUT(PK)
V
OUT
≥ V
OUT(NOM)
– 5% 25 ° C 150 400 400 mA
current
Output noise BW = 300 Hz to 50 kHz,
V
n
25 ° C 160 160 µ V
voltage (RMS) C
OUT
= 10 µ F
Δ V
OUT
/ Δ V
IN
Ripple rejection f = 1 kHz, C
OUT
= 10 µ F 25 ° C 63 63 dB
Short-circuit
I
OUT(MAX)
R
L
= 0 (steady state) 25 ° C 150 150 mA
current
(1) Dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a
1-V differential. This dropout specification does not apply to the 1.8-V option, as the minimum V
IN
= 2.2 V must be observed for proper
biasing of LDO control circuitry.
(2) The ON/ OFF input must be actively terminated. Connect to V
IN
if this function is not used (see Application Information).
Copyright © 2004 – 2008, Texas Instruments Incorporated Submit Documentation Feedback 5