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| LP38852S-ADJ Datasheet, PDF (4/29 Pages) Texas Instruments – 1.5A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start | |||
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LP38852
SNVS482E â JANUARY 2007 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 ensured 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
VDO
Line Regulation, VIN(2)
Line Regulation, VBIAS(2)
Output Voltage Load Regulation(3)
Dropout Voltage(4)
Conditions
VOUT(NOM)+1V ⤠VIN ⤠VBIAS ⤠4.5V (1)
3.0V ⤠VBIAS ⤠5.5V,
10 mA ⤠IOUT ⤠1.5A
VOUT(NOM)+1V ⤠VIN ⤠VBIAS ⤠4.5V(1)
3.0V ⤠VBIAS ⤠5.5V,
10 mA ⤠IOUT ⤠1.5A,
0°C ⤠TJ ⤠+125°C
3.0V ⤠VBIAS ⤠5.5V
4.5V ⤠VBIAS ⤠5.5V
VOUT(NOM)+1V ⤠VIN ⤠VBIAS ⤠4.5V
3.0V ⤠VBIAS ⤠5.5V
10 mA ⤠IOUT ⤠1.5A
IOUT = 1.5A
MIN
492.5
485
490
0.80
0.80
-
-
-
-
TYP
500
500
0.04
0.10
0.2
130
MAX
507.5
515
510
1.20
1.80
-
-
-
165
180
Units
mV
V
%/V
%/V
%/A
mV
IGND(IN)
Quiescent Current Drawn from VIN
Supply
VOUT = 0.80V, VBIAS = 3.0V
10 mA ⤠IOUT ⤠1.5A
VEN ⤠0.5V
-
7.0
8.5
9.0
mA
1
100
300
μA
IGND(BIAS)
Quiescent Current Drawn from
VBIAS Supply
10 mA ⤠IOUT ⤠1.5A
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
-
4.5
-
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 = OFF
50
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 the as 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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