LP38851S-ADJ Datasheet, PDF (2/29 Pages) Texas Instruments – LP38851 800 mA Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

LP38851
SNVS492C – JUNE 2007 – REVISED APRIL 2013
TYPICAL APPLICATION CIRCUIT
V_IN
V_BIAS
V_EN
GND
LP38851-ADJ
C_IN
10 PF Ceramic
IN
BIAS
OUT
C_BIAS
1 PF
ADJ
EN
SS
C_SS
GND
C_FF R1
R2
V_OUT
C_OUT
10 PF
Ceramic
GND
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Connection Diagram
SS 1
EN 2
IN 3
GND 4
ADJ 5
OUT 6
BIAS 7
TAB
IS
GND
Figure 1. 7-Lead PFM - Top View
See KTW0007B Package
ADJ 1
OUT 2
BIAS 3
GND 4
8 N/C
7 IN
6 EN
5 SS
DAP
Connect to GND
Figure 3. 8-Lead SO PowerPad - Top View
See DDA Package
SS 1
EN 2
IN 3
GND 4
ADJ 5
OUT 6
BIAS 7
TAB
IS
GND
Figure 2. 7-Lead SFM - Top View
See NDZ0007B Package
SFM
Pin #
1
2
3
4
5
6
7
-
TAB
PFM
Pin #
1
2
3
4
5
6
7
-
TAB
SO PowerPad
Pin #
5
6
7
4
1
2
3
8
-
PIN DESCRIPTIONS
Pin
Symbol
Pin Description
SS
Soft-Start capacitor connection. Used to control the rise time of
V_OUT at turn-on.
EN
Device Enable, High = On, Low = Off.
IN
The unregulated voltage input
GND
Ground
ADJ
The feedback connection to set the output voltage
OUT
The regulated output voltage
BIAS
The supply for the internal control and reference circuitry.
N/C
No internal connection
The SFM and PFM TAB is a thermal and electrical connection that
TAB
is physically attached to the backside of the die, and used as a
thermal heat-sink connection. See APPLICATION INFORMATION
for details.
2
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