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| LP3855-ADJ_15 Datasheet, PDF (4/22 Pages) Texas Instruments – 1.5A Fast Response Ultra Low Dropout Linear Regulators | |||
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LP3855-ADJ
SNVS244F â SEPTEMBER 2003 â REVISED APRIL 2013
www.ti.com
ELECTRICAL CHARACTERISTICS â LP3855-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)
LP3855-ADJ (2)
Min
Max
Units
VADJ
IADJ
ÎV OL
Adjust Pin Voltage
Adjust Pin Input Current
Output Voltage Line
Regulation (3)
VOUT +1V ⤠VIN⤠7V
10 mA ⤠IL ⤠1.5A
VOUT +1V ⤠VIN⤠7V
10 mA ⤠IL ⤠1.5A
VOUT +1V ⤠VIN ⤠7.0V
1.216
1.198
1.180
1.234
1.253
V
10
100
nA
0.02
0.06
%
ÎVO/ ÎIOUT
Output Voltage Load
Regulation (3)
10 mA ⤠IL ⤠1.5A
0.06
0.12
%
VIN - VOUT
Dropout Voltage,
DDPAK/TO-263 and TO-
220 (4)
Dropout Voltage,
SOT 223(4)(5)
IL = 150 mA
IL = 1.5A
IL = 150 mA
IL = 1.5A
24
35
45
240
310
420
mV
26
35
45
260
320
435
IGND
Ground Pin Current In
Normal Operation Mode
IL = 150 mA
IL = 1.5A
3
9
10
mA
3
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
1.8
A
ISC
Short Circuit Current
Shutdown Input
3.2
A
VSDT
Shutdown Threshold
VSDT Rising from 0.3V
until Output = ON
VSDT Falling from 2.0V
until Output = OFF
1.3
2
V
1.3
0.3
TdOFF
Turn-off delay
TdON
Turn-on delay
ISD
SD Input Current
AC Parameters
IL = 1.5A
IL = 1.5A
VSD = VIN
20
µs
25
µs
1
nA
PSRR
Ripple Rejection
VIN = VOUT + 1V, COUT = 10uF
VOUT = 3.3V, f = 120Hz
73
VIN = VOUT + 0.5V, COUT = 10uF
VOUT = 3.3V, f = 120Hz
57
Ïn(l/f)
Output Noise Density
f = 120Hz
0.8
en
Output Noise Voltage
BW = 10Hz â 100kHz, VOUT = 2.5V
BW = 300Hz â 300kHz, VOUT = 2.5V
150
100
dB
µV
µV (rms)
(1) Typical numbers are at 25°C and represent the most likely parametric norm.
(2) Limits are specified 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.
(5) The SOT-223 package devices have slightly higher dropout due to increased bond wire resistance.
4
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Copyright © 2003â2013, Texas Instruments Incorporated
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