Datasheet

ENABLE
LOGIC
-
+
MOSFET
DRIVER
FOLDBACK
CURRENT
LIMITING
1.25V
REFERENCE
THERMAL
SHUTDOWN
V
IN
V
OUT
GND
P-FET
P-FET
N/C
ADJ
LP38691-ADJ, LP38693-ADJ
SNVS324I –JANUARY 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
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
FB
Foldback Current Limit V
IN
- V
O
> 5V 350
mA
V
IN
- V
O
< 4V 850
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)
I
ADJ
ADJ Input Leakage Current V
ADJ
= 0 - 1.5V
-100 0.01 100 nA
V
IN
= 10V
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 @ V
IN
= 10V 0.5 2 µA
V
EN
Enable Voltage (LP38693-ADJ 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 (LP38693-ADJ V
EN
= 0V or 10V, V
IN
= 10V -1 0.001 1
µA
Only)
Block Diagrams
Figure 4. LP38691-ADJ Functional Diagram (WSON)
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Product Folder Links: LP38691-ADJ LP38693-ADJ