Datasheet
LP3878-ADJ
SNVS311B –MAY 2005–REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the temperature range of -40°C to
125°C. Limits are specified through design, testing, or correlation. The limits are used to calculate TI's Average Outgoing
Quality Level (AOQL). Unless otherwise specified: V
IN
= 3.0V, V
OUT
= 1V, I
L
= 1 mA, C
OUT
= 10 µF, C
IN
= 4.7 µF, V
S/D
= 2V,
C
BYPASS
= 10 nF.
Symbol Parameter Conditions Min Typical Max Units
V
ADJ
Adjust Pin Voltage 0.99 1.00 1.01
V
1 mA ≤ I
L
≤ 800 mA 0.98 1.02
1.00
3.0V ≤ V
IN
≤ 6V 0.97 1.03
Output Voltage Line 3.0V ≤ V
IN
≤ 16V 0.014
0.007 %/V
Regulation
0.032
I
L
= 800 mA, V
OUT
≥ V
OUT(NOM)
- 1% 2.5 3.1
Minimum Input Voltage I
L
= 800 mA
V
IN
(min) Required To Maintain V
OUT
≥ V
OUT(NOM)
- 1% 2.5 2.8 V
Output Regulation 0 ≤ T
J
≤ 125°C
I
L
= 750 mA, V
OUT
≥ V
OUT(NOM)
- 1% 2.5 3.0
I
L
= 100 µA 1 2
3
Dropout Voltage
(1)
I
L
= 200 mA 150 200
V
DO
mV
V
OUT
= 3.8V 300
I
L
= 800 mA 475 600
1100
I
GND
Ground Pin Current I
L
= 100 µA 200
180 µA
225
I
L
= 200 mA 2
1.5
3.5
mA
I
L
= 800 mA 8.5
5.5
15
I
O
(PK) Peak Output Current V
OUT
≥ V
OUT(NOM)
− 5% 1200
mA
I
O
(MAX) Short Circuit Current R
L
= 0 (Steady State) 1300
e
n
Output Noise Voltage BW = 100 Hz to 100 kHz
18 µV(RMS)
(RMS) C
BYPASS
= 10 nF
Ripple Rejection f = 1 kHz
60 dB
I
ADJ
ADJ Pin Bias Current I
L
= 800 mA
200 nA
(Sourcing)
SHUTDOWN INPUT
V
S/D
S/D Input Voltage V
H
= Output ON 1.4 1.6
V
L
= Output OFF, I
IN
≤ 10 µA 0.04 0.20 V
V
OUT
≤ 10 mV, I
IN
≤ 50 µA 0.6
I
S/D
S/D Input Current V
S/D
= 0 0.02 −1
µA
V
S/D
= 5V 5 15
(1) Dropout voltage spec applies only if V
IN
is sufficient so that it does not limit regulator operation.
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