Datasheet

ENABLE
LOGIC
-
+
MOSFET
DRIVER
FOLDBACK
CURRENT
LIMITING
1.25V
REFERENCE
THERMAL
SHUTDOWN
V
IN
V
OUT
GND
P-FET
P-FET
N/C
R1
R2
SNS
LP38690, LP38692
SNVS322J –DECEMBER 2004–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
OUT
+ 1V, C
IN
= C
OUT
= 10 µF, I
LOAD
= 10mA. Min/Max limits are specified through testing,
statistical correlation, or design.
Symbol Parameter Conditions Min Typ
(1)
Max Units
I
Q
Quiescent Current V
IN
≤ 10V, I
L
=100 µA - 1A 55 100
V
EN
≤ 0.4V, (LP38692 Only) 0.001 1 µA
I
L
(MIN) Minimum Load Current V
IN
- V
O
≤ 4V 100
I
FB
Foldback Current Limit V
IN
- V
O
> 5V 450
mA
V
IN
- V
O
< 4V 1500
PSRR Ripple Rejection V
IN
= V
O
+ 2V(DC), with 1V(p-p) /
55 dB
120Hz Ripple
T
SD
Thermal Shutdown Activation
160
(Junction Temp)
°C
T
SD
(HYST) Thermal Shutdown Hysteresis
10
(Junction Temp)
e
n
Output Noise BW = 10Hz to 10kHz
0.7 µV/√Hz
V
O
= 3.3V
V
O
(LEAK) Output Leakage Current V
O
= V
O
(NOM) + 1V @ 10V
IN
0.5 12 µA
V
EN
Enable Voltage (LP38692 Only) Output = OFF 0.4
Output = ON, V
IN
= 4V 1.8
V
Output = ON, V
IN
= 6V 3.0
Output = ON, V
IN
= 10V 4.0
I
EN
Enable Pin Leakage V
EN
= 0V or 10V, V
IN
= 10V -1 0.001 1 µA
BLOCK DIAGRAMS
Figure 5. LP38690 Functional Diagram (WSON)
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