參數(shù)資料
型號(hào)： LX1682CDM-TR
廠商： MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8
封裝： ROHS COMPLIANT, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 1/9頁(yè)
文件大小： 199K
代理商： LX1682CDM-TR
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2000
Rev. 1.1b,2005-03-09
WWW
.Microse
m
i
.CO
M
LX1681/1682
Voltage-Mode PWM Controllers
PRODUCTION DATA SHEET
TM
DESCRI PTI O N
The LX1681/1682 are monolithic,
pulse-width modulator controller ICs.
They are designed to implement a
flexible, low cost buck (step-down)
regulator supply with minimal external
components.
The LX1681 is a non-synchronous
controller;
the
LX1682
has
a
synchronous driver for higher efficiency.
The output voltage is adjustable by
means of a resistor divider to set the
voltage between 1.25V and 4.5V.
Short-circuit current limiting can be
implemented without expensive current
sense resistors. Current is sensed using
the voltage drop across the RDS(ON) of the
MOSFET — sensing is delayed for 1s
to eliminate MOSFET ringing errors.
Hiccup-mode fault protection reduces
average power to the power elements
during short-circuit conditions.
Switching frequency is fixed at
200kHz for optimal cost and space.
Under-voltage lockout and soft-start
for optimal start-up performance. Pulling
the soft-start pin to ground can disable
the LX1681/82.
Small 8-pin SOIC packaging reduces
board space. Optimized for 5V-to-3.3V
or
5V-to-2.5V
conversion,
the
LX1681/82 can also be used for
converting 12V to 5V, 3.3V or other
voltages
with
high
efficiency,
eliminating the need for bulky heat sinks.
IMPORTANT:
For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATUR ES
Fixed 200kHz Switching Frequency
Constant Frequency Voltage-Mode
Control Requires NO External
Compensation
Hiccup-Mode Over-Current
Protection
High Efficiency
Output Voltage Set By Resistor
Divider
Under-Voltage Lockout
Soft-Start And Enable
Synchronous Rectification
(LX1682)
Non-Synchronous Rectification
(LX1681)
Small, 8-pin Surface Mount
Package
APPLI CATI ONS
5V to 3.3V Or Less Buck
Regulators
FPGA Supplies
Microprocessor Chipset Supplies
(e.g. Camino, Whitney, etc.)
Rambus
RIMM Supplies
Hard Disk Drives
Computer Add-on Cards
PRODUCT H I GHLIGHT
LX1681
0.1F
Q
1
D
2
L
1
C
2
R
1
R
2
R
SET
C
1
C
3
V
FB
C
SS
N.C.
GND
TDRV
V
C1
CS
V
C2
V
BO O ST
12V
V
IN
5V
V
OU T
SS
LX1681 Non-Synchronous Controller
5H
1500F
x3
IRL3103S
MBR 2545
1500F
x3
1F
LX1682
0.1F
Q
1
L
1
C
2
R
1
R
2
R
SET
C
1
V
FB
C
SS
BDR V
GND
TD RV
V
C1
CS
V
C2
V
IN
5V
V
OU T
SS
Q
2
C
3
V
BO O ST
12V
LX1682 Synchronous C ontroller
1500F
x3
5H
IR L3103S
IRL3103S
1500F
x3
1F
PACKAGE ORDER I N FO
DM
Plastic SOIC
8-PIN
TA (
°C)
OUTPUT
RoHS Compliant / Pb-free
Transition D/C: 0440
0 to 70
Non-Synchronous
LX1681CDM
Synchronous
LX1682CDM
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1681CDM-TR)
LL
XX
11
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