LX8821 Microsemi Corporation, LX8821 Datasheet - Page 2

• Manufacturer Part Number: LX8821
• Description: Dual Channel 2.5a Low Dropout Regulator
• Manufacturer: Microsemi Corporation

Copyright ¤ 2005
Rev. 1.1, 2005-03-09
Junction Temperature Calculation: T
The T
All of the above assume no ambient airflow. T
depending on mounting technique. (See Application Notes Section: Thermal considerations)
DF
THERMAL RESISTANCE
THERMAL RESISTANCE
Input Voltage (V
Load Current (Internally Limited) ..................................................................3.0A
Power Dissipation ......................................................................Internally Limited
Short-Circuit Protection .......................................................................... Indefinite
Operating Junction Temperature.................................................................. 150qC
Storage Temperature Range...........................................................-65qC to 150qC
Peak Package Solder Reflow Temperature
(40 second maximum exposure) ..................................................... 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
P
JA
1
2
3
4
5
6
7
I N
numbers are guidelines for the thermal performance of the device/pc-board system.
TM
Ground. Currents are positive into, negative out of specified terminal
Plastic S-Pak 7-Pin
ADJ
N
V
V
V
V
GND
AME
CTRL
OUT1
OUT2
---
PWR
A B S O L U T E M A X I M U M R A T I N G S
CTRL
V2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
, V
-
-
JUNCTION TO
JUNCTION TO
PWR
Unregulated input voltage supply, provides bias for control circuitry, (V
Regulator #1 fixed output voltage, 1.5V nominal.
Unregulated input voltage supply for power section. For proper operation: (V
Common terminal for ground reference, Tab of package is internally connected to this pin.
Regulator #2 output
Regulator #2 feedback voltage, servos to 1.25V. Using external resistors to program V
Not used, no internal connection, may be left floating or connected to any other pin or voltage.
T H E R M A L D A T A
).........................................................................13.5V
J
= T
A
+ (P
F U N C T I O N A L P I N D E S C R I P T I O N
T
A
AB
MBIENT
JA
D
can vary from 10qC/W to > 50qC/W
Microsemi Microelectronics Division
, T
x T
JT
JA
).
, T
JA
Microsemi
®
.
D
UAL
20 - 50qC/W
D
4.5qC/W
ESCRIPTION
C
HANNEL
P
RODUCTION DATA
2.5A L
OW
RoHS 100% Matte Tin Lead Finish
P A C K A G E P I N O U T
TAB is GND
CTRL
Pin 4 and Tab are common
D
S
ROPOUT
– V
HEET
DF P
PWR
(Top View)
OUT
ACKAGE
– V
) > 1V.
OUT
R
LX8821
7
6
5
4
3
2
1
) > V
OUT2
EGULATOR
.
DROPOUT
NC
ADJ
V
G ND
V
V
V
OUT2
PW R
OUT1
CTRL
V2
Page 2
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