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参数资料
| 型号： | LX1681CDM |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 1/9页 |
| 文件大小： | 145K |
| 代理商： | LX1681CDM |
LIN DOC #: 1681
DESCRIPTION
KEY FEA TURES
s Fixed 200kHz Switching Frequency
s Constant Frequency Voltage-Mode Control
Requires NO External Compensation
s Hiccup-Mode Over-Current Protection
s High Efficiency
s Output Voltage Set By Resistor Divider
s Under-Voltage Lockout
s Soft-Start And Enable
s Synchronous Rectification (LX1682)
s Non-Synchronous Rectification (LX1681)
s Small, 8-pin Surface Mount Package
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 mini-
mal external components.
The LX1681 is a non-synchronous con-
troller; 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 R
DS(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.
The
LX1681/82 can be disabled by pulling the soft-
start pin to ground.
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.
PRODUCT HIGHLIGHT
V O L T AGE -M ODE PWM C ONTROLLERS
P RODUCTION D AT A S HEET
T HE
I NFINITE
P OWER
OF
I NNOV A TION
APPLICA TIONS
s 5V to 3.3V Or Less Buck Regulators
s FPGA Supplies
s Microprocessor Chipset Supplies
(e.g. Camino, Whitney, etc.)
s Rambus RIMMTM Supplies
s Hard Disk Drives
s Computer Add-on Cards
Note: All surface-mount packages are available in Tape & Reel,
append the letter "T" to part number. (i.e. LX1681CDMT)
P ACKAGE ORDER INFORMA TION
T
A (°C)
0 to 70
Non-Synchronous
LX1681CDM
Synchronous
LX1682CDM
Copyright 1999
Rev. 1.0 5/99
1
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
L IN F INITY M ICROELECTRONICS I NC .
Plastic SOIC
8-pin
DM
LX1681/1682
Output
LX1681
V
BOOST
12V
8
7
6
5
4
3
2
1
V
FB
SS
N.C.
GND
V
CC
CS
V
C1
TDRV
V
IN
5V
C
SS
V
OUT
R
SET
R
1
R
2
C
3
1F
C
1
1500Fx3
Q
1
IRL3103S
D
2
MBR2545
L
1
5H
C
2
0.1F
1500F
x3
LX1682
V
BOOST
12V
8
7
6
5
4
3
2
1
V
FB
SS
GND
BDRV
V
CC
CS
V
C1
TDRV
V
IN
5V
C
SS
V
OUT
R
SET
R
1
R
2
C
2
L
1
5H
Q
1
IRL3103S
Q
2
IRL3103S
C
1
1500Fx2
C
3
1F
0.1F
1500F
x3
LX1681 NON-SYNCHRONOUS CONTROLLER
LX1682 SYNCHRONOUS CONTROLLER
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
相关PDF资料 |
PDF描述 |
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| LX1682CDMT | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| LX1682CDM | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| LX1681CDMT | 1 A SWITCHING CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO8 |
| LX1734-CSET | 1 A SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PDSO5 |
| LX432CSCTR | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1681CDMT | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Voltage-Mode SMPS Controller |
| LX1681CDM-TR | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Voltage-Mode PWM Controllers |
| LX1681IDM | 功能描述:IC REG CTRLR DIVIDER PWM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1682 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:VOLTAGE - MODE PWM CONTROLLERS |
| LX1682CDM | 功能描述:IC REG CTRLR DIVIDER PWM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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