Datasheet

LP3876-ADJ
SNVS245C SEPTEMBER 2003REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS LP3876-ADJ
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)
+ 1.5V, I
L
= 10 mA, C
OUT
= 10µF, V
SD
= 2V.
Symbol Parameter Conditions Typ
(1)
LP3876-ADJ
(2)
Units
Min Max
V
OUT
+1.5V V
IN
7V, 10 mA I
L
3A 1.198 1.234
V
ADJ
Adjust Pin Voltage 1.216 V
1.180 1.253
I
ADJ
Adjust Pin Input Current V
OUT
+1.5V V
IN
7V, 10 mA I
L
3A 10 100 nA
ΔV
OL
Output Voltage Line V
OUT
+1.5V V
IN
7.0V 0.02 %
0.06
Regulation
(3)
ΔV
O
/ ΔI
OUT
Output Voltage Load 10 mA I
L
3A 0.08 %
0.14
Regulation
(3)
V
IN
- V
OUT
I
L
= 300 mA 80 105
125
Dropout Voltage
(4)
mV
I
L
= 3A 800 1000
1200
I
L
= 300 mA 5 9
10
Ground Pin Current In Normal
I
GND
mA
Operation Mode
I
L
= 3A 6 14
15
I
GND
Ground Pin Current In Shutdown V
SD
0.3V 1 10 µA
Mode
-40°C T
J
85°C 50
I
O(PK)
Peak Output Current V
O
V
O(NOM)
- 4% 4.5 A
SHORT CIRCUIT PROTECTION
I
SC
Short Circuit Current 6 A
SHUTDOWN INPUT
Output = High V
IN
2
V
SDT
Shutdown Threshold V
Output = Low 0 0.3
T
dOFF
Turn-off delay I
L
= 3A 20 µs
T
dON
Turn-on delay I
L
= 3A 25 µs
I
SD
SD Input Current V
SD
= V
IN
1 nA
AC PARAMETERS
V
IN
= V
OUT
+ 1V, C
OUT
= 10uF 73
V
OUT
= 3.3V, f = 120Hz
PSRR Ripple Rejection dB
V
IN
= V
OUT
+ 0.5V, C
OUT
= 10uF 57
V
OUT
= 3.3V, f = 120Hz
ρ
n(l/f
Output Noise Density f = 120Hz 0.8 µV
BW = 10Hz – 100kHz, V
OUT
= 2.5V 150
e
n
Output Noise Voltage µV (rms)
BW = 300Hz – 300kHz, V
OUT
= 2.5V 100
(1) Typical numbers are at 25°C and represent the most likely parametric norm.
(2) Limits are verified by testing, design, or statistical correlation.
(3) Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage.
Output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current.
(4) Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value.
Dropout voltage specification applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is
nothing but the input to output differential, since the minimum input voltage is 2.5V.
4 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LP3876-ADJ