Datasheet

LP38852
SNVS482E –JANUARY 2007–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
Unless otherwise specified: V
OUT
= 0.80V, V
IN
= V
OUT(NOM)
+ 1V, V
BIAS
= 3.0V, V
EN
= V
BIAS
, I
OUT
= 10 mA, C
IN
= C
OUT
= 10 µF,
C
BIAS
= 1 µF, C
SS
= open. Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction
temperature (T
J
) 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 T
J
= 25°C, and are provided for reference purposes
only.
Symbol Parameter Conditions MIN TYP MAX Units
V
OUT(NOM)
+1V ≤ V
IN
≤ V
BIAS
≤ 4.5V
(1)
492.5 507.5
3.0V ≤ V
BIAS
≤ 5.5V, 500
485 515
10 mA ≤ I
OUT
≤ 1.5A
V
ADJ
V
ADJ
Accuracy mV
V
OUT(NOM)
+1V ≤ V
IN
≤ V
BIAS
≤ 4.5V
(1)
3.0V ≤ V
BIAS
≤ 5.5V,
490 500 510
10 mA ≤ I
OUT
≤ 1.5A,
0°C ≤ T
J
≤ +125°C
3.0V ≤ V
BIAS
≤ 5.5V 0.80 1.20
V
OUT
V
OUT
Range V
4.5V ≤ V
BIAS
≤ 5.5V 0.80 1.80
ΔV
OUT
/ΔV
IN
Line Regulation, V
IN
(2)
V
OUT(NOM)
+1V ≤ V
IN
≤ V
BIAS
≤ 4.5V - 0.04 - %/V
ΔV
OUT
/ΔV
BIAS
Line Regulation, V
BIAS
(2)
3.0V ≤ V
BIAS
≤ 5.5V - 0.10 - %/V
ΔV
OUT
/ΔI
OUT
Output Voltage Load Regulation
(3)
10 mA ≤ I
OUT
≤ 1.5A - 0.2 - %/A
165
V
DO
Dropout Voltage
(4)
I
OUT
= 1.5A - 130 mV
180
V
OUT
= 0.80V, V
BIAS
= 3.0V 8.5
- 7.0 mA
10 mA ≤ I
OUT
≤ 1.5A 9.0
Quiescent Current Drawn from V
IN
I
GND(IN)
Supply
100
V
EN
≤ 0.5V 1 μA
300
3.8
10 mA ≤ I
OUT
≤ 1.5A - 3.0 mA
4.5
Quiescent Current Drawn from
I
GND(BIAS)
V
BIAS
Supply
170
V
EN
≤ 0.5V 100 μA
200
2.20 2.70
UVLO Under-Voltage Lock-Out Threshold V
BIAS
rising until device is functional 2.45 V
2.00 2.90
V
BIAS
falling from UVLO threshold until 60 300
UVLO
(HYS)
Under-Voltage Lock-Out Hysteresis 150 mV
device is non-functional 50 350
V
IN
= V
OUT(NOM)
+ 1V,
I
SC
Output Short-Circuit Current - 4.5 - A
V
BIAS
= 3.0V, V
OUT
= 0.0V
Soft-Start
r
SS
Soft-Start internal resistance 11.0 13.5 16.0 kΩ
Soft-Start time
t
SS
C
SS
= 10 nF - 675 - μs
t
SS
= C
SS
× r
SS
× 5
Enable
V
EN
= V
BIAS
- 0.01 -
I
EN
ENABLE pin Current μA
-19 -40
V
EN
= 0.0V, V
BIAS
= 5.5V -30
-13 -51
1.00 1.50
V
EN(ON)
Enable Voltage Threshold V
EN
rising until Output = ON 1.25 V
0.90 1.55
V
EN
falling from V
EN(ON)
until 50 150
V
EN(HYS)
Enable Voltage Hysteresis 100 mV
Output = OFF 30 200
t
OFF
Turn-OFF Delay Time R
LOAD
x C
OUT
<< t
OFF
- 20 -
µs
t
ON
Turn-ON Delay Time R
LOAD
x C
OUT
<< t
ON
- 15 -
(1) V
IN
cannot exceed either V
BIAS
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 (V
IN
- V
OUT
) where the input voltage is low enough to cause the
output voltage to drop 2% from the nominal value.
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