Data Sheet

LP2985-N
SNVS018V –MARCH 2000–REVISED JUNE 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
(1)
(continued)
Limits in standard typeface are for T
J
= 25°C. and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, I
L
= 1 mA, C
IN
= 1 µF, C
OUT
= 4.7 µF, V
ON/OFF
= 2V.
LP2985AI-X.X
(2)
LP2985I-X.X
(2)
Symbol Parameter Conditions Typ Units
Min Max Min Max
V
IN
–V
O
Dropout Voltage
(3)
I
L
= 0 1 3 3
5 5
I
L
= 1 mA 7 10 10
15 15
I
L
= 10 mA 40 60 60
mV
90 90
I
L
= 50 mA 120 150 150
225 225
I
L
= 150 mA 280 350 350
575 575
I
GND
Ground Pin Current I
L
= 0 65 95 95
125 125
I
L
= 1 mA 75 110 110
170 170
I
L
= 10 mA 120 220 220
400 400
µA
I
L
= 50 mA 350 600 600
1000 1000
I
L
= 150 mA 850 1500 1500
2500 2500
V
ON/OFF
< 0.3V 0.01 0.8 0.8
V
ON/OFF
< 0.15V 0.05 2 2
V
ON/OFF
ON/OFF Input High = O/P ON 1.4 1.6 1.6
V
Voltage
(4)
Low = O/P OFF 0.55 0.15 0.15
I
ON/OFF
ON/OFF Input Current V
ON/OFF
= 0 0.01 −2 −2
µA
V
ON/OFF
= 5V 5 15 15
e
n
Output Noise BW = 300 Hz to 50 kHz,
Voltage (RMS) C
OUT
= 10 µF 30 µV
C
BYPASS
= 10 nF
Ripple Rejection f = 1 kHz, C
BYPASS
= 10 nF
45 dB
C
OUT
= 10 µF
I
O
(SC) Short Circuit Current R
L
= 0 (Steady State)
(5)
400 mA
I
O
(PK) Peak Output Current V
OUT
≥ V
o
(NOM) −5% 350 mA
(3) Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a
1V differential.
(4) The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to APPLICATION HINTS.
(5) The LP2985-N has foldback current limiting which allows a high peak current when V
OUT
> 0.5V, and then reduces the maximum output
current as V
OUT
is forced to ground (see TYPICAL PERFORMANCE CHARACTERISTICS curves).
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