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| LP38853_15 Datasheet, PDF (4/28 Pages) Texas Instruments – LP38853 3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start | |||
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LP38853
SNVS335D â DECEMBER 2006 â REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Unless otherwise specified: VOUT = 0.80V, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF,
CBIAS = 1 µF, CSS = open. Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction
temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical
correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes
only.
Symbol
Parameter
VADJ
VADJ Accuracy
VOUT
VOUT Range
ÎVOUT/ÎVIN
ÎVOUT/ÎVBIAS
ÎVOUT/ÎIOUT
Line Regulation, VIN(2)
Line Regulation, VBIAS(2)
Output Voltage Load Regulation(3)
VDO
Dropout Voltage(4)
Conditions
VOUT(NOM)+1V ⤠VIN ⤠VBIAS ⤠4.5V, (1)
3.0V ⤠VBIAS ⤠5.5V,
10 mA ⤠IOUT ⤠3A
VOUT(NOM)+1V ⤠VIN ⤠VBIAS ⤠4.5V,(1)
3.0V ⤠VBIAS ⤠5.5V,
10 mA ⤠IOUT ⤠3.0A,
0°C ⤠TJ ⤠+125°C
3.0V ⤠VBIAS ⤠5.5V
4.5V ⤠VBIAS ⤠5.5V
VOUT(NOM)+1V ⤠VIN ⤠VBIAS
3.0V ⤠VBIAS ⤠5.5V
10 mA ⤠IOUT ⤠3.0A
IOUT = 3.0A
Min
492.5
485.0
490.0
0.80
0.80
-
-
-
-
Typ
500.
500.
0.04
0.10
0.2
240
Max
507.5
515.0
510.0
1.20
1.80
-
-
-
300
450
Units
mV
V
%/V
%/V
%/A
mV
IGND(IN)
Quiescent Current Drawn from VIN
Supply
VOUT = 0.80V
VBIAS = 3.0V
10 mA ⤠IOUT ⤠3.0A
VEN ⤠0.5V
-
7.0
8.5
9.0
mA
1
10
300
μA
IGND(BIAS)
Quiescent Current Drawn from
VBIAS Supply
10 mA ⤠IOUT ⤠3.0A
VEN ⤠0.5V
-
3.0
3.8
4.5
mA
100
170
200
μA
UVLO
Under-Voltage Lock-Out Threshold VBIAS rising until device is functional
2.20
2.00
2.45
2.70
2.90
V
UVLO(HYS)
Under-Voltage Lock-Out Hysteresis
VBIAS falling from UVLO threshold until
device is non-functional
60
50
150
300
350
mV
ISC
Soft-Start
Output Short-Circuit Current
VIN = VOUT(NOM) + 1V,
VBIAS = 3.0V, VOUT = 0.0V
-
5.8
-
A
rSS
tSS
Enable
Soft-Start internal resistance
Soft-Start time
tSS = CSS Ã rSS Ã 5
CSS = 10 nF
11.0
13.5
16.0
kâ¦
-
675
-
μs
IEN
ENABLE pin Current
VEN = VBIAS
VEN = 0.0V, VBIAS = 5.5V
-
0.01
-
-19
-13
-30
-40
-51
μA
VEN(ON)
Enable Voltage Threshold
VEN rising until Output = ON
1.00
0.90
1.25
1.50
1.55
V
VEN(HYS) Enable Voltage Hysteresis
VEN falling from VEN(ON) until Output =
50
OFF
30
100
150
200
mV
tOFF
Turn-OFF Delay Time
tON
Turn-ON Delay Time
RLOAD x COUT << tOFF
RLOAD x COUT << tON
-
20
-
µs
-
15
-
(1) VIN cannot exceed either VBIAS or 4.5V, whichever value is lower.
(2) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
(3) Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load
to full load.
(4) Dropout voltage is defined as the input to output voltage differential (VIN - VOUT) where the input voltage is low enough to cause the
output voltage to drop 2% from the nominal value.
4
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