LX1918CLD MICROSEMI [Microsemi Corporation], LX1918CLD Datasheet - Page 2

• Manufacturer Part Number: LX1918CLD
• Description: 1.8A Step-Down Synchronous Converter
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2004
Rev. 1.1, 2005-07-05
Supply Input Voltage (PWR, VCC)..................................................-0.3V to 6.5V
Supply Input Transient Voltage (PWR, VCC).................................................10V
Input Voltage (E/S, FB,MODE) ......................................... -0.3V to (V
Maximum Switch Voltage (SW)....................................... -0.3V to (V
SW Peak Current (Internally Limited)............................................................3.6A
Operating Ambient Temperature Range ........................................-40°C to +85°C
Operating Junction Temperature Range.......................................-40°C to +125°C
Maximum Operating Junction Temperature ................................................ 150°C
Storage Temperature Range...........................................................-65°C to 150°C
Peak Package Solder Reflow Temp. (40 second max. exposure) ... 260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Junction Temperature Calculation: T
The θ
above assume no ambient airflow. The variation in overall thermal resistance, Θ
by heatsink area available on the PCB.
LD
PIN
THERMAL RESISTANCE
1
2
3
4
5
6
7
8
JA
TM
Ground. Currents are positive into, negative out of specified terminal
numbers are guidelines for the thermal performance of the device/pc-board system. All of the
Plastic MLP 3mm X 3mm 8-Pin
MODE
SGND
PGND
Name
PWR
VCC
SW
E/S
FB
A B S O L U T E M A X I M U M R A T I N G S
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Feedback Pin - This pin is regulated to the internal reference voltage.
Signal Ground – Low current signal ground reference for IC; also attaches to bottom pad. Connect
to common ground reference.
Ground – High current ground; connects to common ground reference.
MOSFET Switch (Drain) Connects for inductor.
Power Input – Connect a decoupled voltage source between 2.7V and 5.5V.
Reference power supply for IC.
Light Load Mode Select - Ground for Highest efficiency mode or pull high for Lowest EMI mode
during light load operation.
Enable and External Synchronization – Pull high to enable operation with internal oscillator. Apply
an external oscillator signal to synchronize the PWM switch frequency. Apply logic low to cause IC
to enter Shutdown mode.
-
JUNCTION TO
T H E R M A L D A T A
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
D
x θ
A
JA
MBIENT
).
Integrated Products Division
, θ
®
Microsemi
JA
.
1.8A Step-Down Synchronous Converter
JA
, is directly affected
Description
35 – 50°C/W
PWR
CC
+ 0.3V)
+ 0.3V)
P
RODUCTION
RoHS / Pb-free 100% Matte Tin Lead Finish
SGND
PGND
“xxxx” Denote Date Code and Lot Identification
D
SW
P A C K A G E P I N O U T
FB
ATA
1
2
3
4
LD P
S
1918
MSC
HEET
xxxx
ACKAGE
LD P
(Top View)
ACKAGE
M
ARKINGS
LX1918
8
7
6
5
E/S
MODE
VCC
PWR
Page 2