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| LP3856-ADJ_15 Datasheet, PDF (4/22 Pages) Texas Instruments – 3A Fast Response Ultra Low Dropout Linear Regulators | |||
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LP3856-ADJ
SNVS243E â SEPTEMBER 2003 â REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS â LP3856-ADJ
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 10 mA, COUT = 10µF, VSD = 2V.
Symbol
Parameter
Conditions
Typ (1)
LP3856-ADJ (2)
Min
Max
Units
VADJ Adjust Pin Voltage
VOUT +1V ⤠VIN⤠7V, 10 mA ⤠IL ⤠3A
1.216
1.198
1.180
1.234
1.253
V
IADJ
ÎV OL
Adjust Pin Input Current
Output Voltage Line Regulation (3)
VOUT +1V ⤠VIN⤠7V, 10 mA ⤠IL ⤠3A
VOUT +1V ⤠VIN⤠7.0V
10
0.02
0.06
100
nA
%
ÎVO/
ÎIOUT
Output Voltage Load Regulation(3)
VIN - VOUT Dropout Voltage(4)
10 mA ⤠IL ⤠3A
IL = 300 mA
IL = 3A
0.08
0.14
%
39
55
75
mV
390
500
700
IGND
Ground Pin Current In Normal
Operation Mode
IL = 300 mA
IL = 3A
4
9
10
mA
4
9
10
IGND
Ground Pin Current In Shutdown
Mode
IO(PK) Peak Output Current
Short Circuit Protection
VSD ⤠0.3V
-40°C ⤠TJ ⤠85°C
VO ⥠VO(NOM) - 4%
0.01
10
µA
50
4.5
A
ISC
Short Circuit Current
Shutdown Input
6
A
VSDT Shutdown Threshold
TdOFF Turn-off delay
TdON Turn-on delay
ISD
SD Input Current
AC Parameters
VSDT Rising from 0.3V until Output = ON
1.3
VSDT Falling from 2.0V until Output = OFF
1.3
IL = 3A
20
IL = 3A
25
VSD = VIN
1
2
V
0.3
µs
µs
nA
PSRR Ripple Rejection
Ïn(l/f Output Noise Density
en
Output Noise Voltage
VIN = VOUT + 1V, COUT = 10uF
VOUT = 3.3V, f = 120Hz
73
VIN = VOUT + 0.5V, COUT = 10uF
VOUT = 3.3V, f = 120Hz
57
f = 120Hz
0.8
BW = 10Hz â 100kHz, VOUT = 2.5V
150
BW = 300Hz â 300kHz, VOUT = 2.5V
100
dB
µV
µV
(rms)
(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
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Product Folder Links: LP3856-ADJ
Copyright © 2003â2013, Texas Instruments Incorporated
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