LX1681CDM-TR MICROSEMI [Microsemi Corporation], LX1681CDM-TR Datasheet - Page 2

• Manufacturer Part Number: LX1681CDM-TR
• Description: Voltage-Mode PWM Controllers
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2000
Rev. 1.1b,2005-03-09
P
IN
Supply Voltage (V
Supply Voltage (V
Output Drive Peak Current Source (500ns) ................................................................. 1.0A
Output Drive Peak Current Sink (500ns) ..................................................................... 1.0A
Input Voltage (SS/ENABLE Pin) ........................................................................ -0.3 to 6V
Operating Junction Temperature................................................................................ 150°C
Storage Temperature................................................................................. -65°C to +150°C
RoHS / Pb-free Peak Package Solder Reflow Temp (40 second max. exposure) ........... 260°C (+0, -5)
Note:
Junction Temperature Calculation: T
The θ
system. All of the above assume no ambient airflow.
TDRV
BDRV
DM
GND
V
V
V
CS
N
SS
THERMAL RESISTANCE
CC
FB
C1
AME
JA
TM
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.
numbers are guidelines for the thermal performance of the device/pc-board
P
A B S O L U T E M A X I M U M R A T I N G S ( N O T E 1 )
ACKAGE
Voltage Feedback. A 1.25V reference is connected to a resistor divider to set desired output voltage.
Soft-Start And Hiccup Capacitor Pin. During start up the voltage of this pin controls the output voltage. An
internal 20kΩ resistor and the external capacitor set the time constant for soft-startup. Soft-start does not begin
until the supply voltage exceeds the UVLO threshold. When over-current occurs, this capacitor is used for timing
hiccup. The PWM can be disabled by pulling the SS pin below 0.3V
Ground for IC.
Gate Drive For Upper MOSFET.
Gate Drive For Lower MOSFET.
Separate Supply For MOSFET Gate Drive. Connect to 12V.
Over-Current Set. Connect resistor between CS pin and the source of the upper MOSFET to set current-limit
point.
IC Supply Voltage (nominal 5V) And High Side Drain Sense Voltage.
C1
CC
).................................................................................................... 18V
) ..................................................................................................... 7V
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
T H E R M A L D A T A
-
JUNCTION TO AMBIENT
J
= T
F U N C T I O N A L P I N D E S C R I P T I O N
A
+ (P
D
Linfinity Microelectronics Division
x θ
JA
).
®
Microsemi
, θ
JA
D
ESCRIPTION
Voltage-Mode PWM Controllers
165°C/W
P
RODUCTION
D
BDRV
RoHS / Pb-free 100% Matte Tin Lead Finish
GND
GND
P A C K A G E P I N O U T
N.C.
ATA
V
V
SS
SS
FB
FB
S
HEET
1
2
3
4
1
2
3
4
DM P
DM P
(Top View)
(Top View)
LX1681
LX1682
LX1681/1682
ACKAGE
ACKAGE
8
7
6
5
8
7
6
5
V
CS
V
TDRV
V
CS
V
TDRV
CC
C1
CC
C1
Page 2