
Microsemi 
Linfinity Microelectronics Division 
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 
Page 2
Copyright 
 2000 
Rev. 0.3D, 2002-01-08 
W
M
.
C
LX8817
Dual Channel 2.5A Low Dropout Regulator 
P
RODUCTION
 D
ATA
 S
HEET
L I N F I N I T Y  D I V I S I O N
A B S O L U T E  M A X I M U M  R A T I N G S  
Input Voltage (V
CTRL
, V
PWR
) ........................................................................13.5V 
Load Current (Internally Limited)..................................................................3.0A 
Power Dissipation......................................................................Internally Limited 
Short-Circuit Protection...........................................................................Indefinite 
Operating Junction Temperature..................................................................150
°
C 
Storage Temperature Range .......................................................... -65
°
C to 150
°
C 
Lead Temperature (Soldering 180 seconds).................................................235
°
C 
Note: Exceeding these ratings could cause damage to the device.  All voltages are with  respect to 
Ground.  Currents are positive into, negative out of specified terminal
. 
 P A C K A G E  P IN  O U T  
DF P
ACKAGE
(Top View)
1
V
CTRL
V
OUT1
V
PWR
GND
V
OUT2
2
3
4
5
TAB is GND
ADJ
V2
6
NC
7
T H E R M A L  D A T A  
DF
THERMAL RESISTANCE
-
JUNCTION TO 
T
AB
, 
θ
JT 
THERMAL RESISTANCE
-
JUNCTION TO 
A
MBIENT
, 
θ
JA
Junction Temperature Calculation: T
J
 = T
A
 + (P
D
 x 
θ
JA
). 
The 
θ
JA
 numbers are guidelines for the thermal performance of the device/pc-board 
system.  All of the above assume no ambient airflow.  
θ
JA
 can vary significantly depending 
on mounting technique.  (See Application Notes Section: Thermal considerations) 
Plastic S-PAK 7-PIN
4.5
°
C/W 
30
°
C/W
F U N C T I O N A L  P I N  D E S C R I P T I O N  
P
IN
N
AME
D
ES CRIPT ION
1 
2 
V
CTRL 
V
OUT1
Unregulated input voltage supply, provides bias for control circuitry, (V
CTRL
 – V
OUT
) > 1V. 
Regulator #1 fixed output voltage. 
Unregulated input voltage supply for power section. For proper operation: (V
PWR
 – V
OUT
) > 
V
DROPOUT
.
Common terminal for ground reference, Tab of package is internally connected to this pin. 
Regulator #2 adjustable output. 
Regulator #2 voltage feedback.  Sets the output voltage for regulator #2 via an external resistor 
divider. 
Not used. 
3 
V
PWR
4 
5 
GND
V
OUT2 
6 
ADJ
V2 
7 
NC 
P
A
C
K
A
G
E
D
A
T
A