Datasheet

LP38841-ADJ
SNVS305C –FEBRUARY 2005–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, V
BIAS
= 4.5V, I
L
= 10 mA, C
IN
= 10 µF CER, C
OUT
= 22 µF CER, V
S/D
= V
BIAS
.
Min/Max limits are specified through testing, statistical correlation, or design.
Symbol Parameter Conditions MIN TYP
(1)
MAX Units
I
Q
(V
IN
) Quiescent Current Drawn from V
IN
10 mA < I
L
< 0.8A 35
30 mA
Supply 40
V
S/D
≤ 0.3V 1
0.06 µA
30
I
Q
(V
BIAS
) Quiescent Current Drawn from 10 mA < I
L
< 0.8A 4
2 mA
V
BIAS
Supply 6
V
S/D
≤ 0.3V 1
0.03 µA
30
UVLO V
BIAS
Voltage Where Regulator
3.8 V
Output Is Enabled
I
SC
Short-Circuit Current V
OUT
= 0V 2.6 A
Shutdown Input
V
SDT
Output Turn-off Threshold Output = ON 0.7 1.3
V
Output = OFF 0.3 0.7
Td (OFF) Turn-OFF Delay R
LOAD
X C
OUT
<< Td (OFF) 20
µs
Td (ON) Turn-ON Delay R
LOAD
X C
OUT
<< Td (ON) 15
I
S/D
S/D Input Current V
S/D
=1.3V 1
µA
V
S/D
≤ 0.3V −1
θ
J-A
Junction to Ambient Thermal SO-8 Package
(5)
43 °C/W
Resistance
AC Parameters
PSRR (V
IN
) Ripple Rejection for V
IN
Input V
IN
= V
OUT
+1V, f = 120 Hz 80
Voltage
V
IN
= V
OUT
+ 1V, f = 1 kHz 65
dB
PSRR (V
BIAS
) Ripple Rejection for V
BIAS
Voltage V
BIAS
= V
OUT
+ 3V, f = 120 Hz 58
V
BIAS
= V
OUT
+ 3V, f = 1 kHz 58
Output Noise Density f = 120 Hz 1 µV/root−Hz
e
n
Output Noise Voltage BW = 10 Hz − 100 kHz 150
µV (rms)
V
OUT
= 1.5V
BW = 300 Hz − 300 kHz 90
(5) For optimum heat dissipation, the exposed DAP on the bottom of the SO package must be soldered to a copper plane or connected
using thermal vias to an internal copper plane.
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