Datasheet 搜索 > DC/DC转换器 > National Semiconductor（美国国家半导体） > LM3485MM 数据手册 > LM3485MM 产品手册 1/15 页
器件3D模型￥ 5.241
LM3485MM 产品手册 - National Semiconductor（美国国家半导体）
制造商:
National Semiconductor（美国国家半导体）
分类:
DC/DC转换器
封装:
VSSOP
描述:
DC-DC芯片/LM3485MM
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P2Hot
典型应用电路图在P1
原理图在P9P13
封装尺寸在P15
型号编码规则在P2
标记信息在P2
封装信息在P2
功能描述在P1P9P10P11
技术参数、封装参数在P3P4
应用领域在P1
电气规格在P3P4P5P6P7P8P11
导航目录
LM3485MM数据手册
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LM3485
Hysteretic PFET Buck Controller
General Description
The LM3485 is a high efficiency PFET switching regulator
controller that a system designer can use to quickly and
easily develop a small, low cost, switching buck regulator for
a wide range of applications. The use of a hysteretic control
scheme provides for simple design without any control loop
stability concerns using a wide variety of external compo-
nents. The PFET architecture also allows for low component
count as well as ultra-low dropout operation. Another benefit
is high efficiency operation at light loads without an increase
in output ripple. Current limit protection circuit is provided by
measuring the voltage across the PFET’s R
DSON
thus elimi-
nating a costly sense resistor. The current limit can be ad-
justed allowing for designs at various output currents and
costs.
Features
n Easy to use control methodology
n No control loop compensation required
n 4.5V to 35V wide input range
n 1.242V to V
IN
adjustable output range
n High Efficiency 93%
n
±
1.3% (
±
2% over temp) internal reference
n 100% duty cycle
n Maximum operating frequency
>
1MHz
n Current limit protection
n MSOP-8
Applications
n Set-Top Box
n DSL/Cable Modem
n PC/IA
n Auto PC
n TFT Monitor
n Battery Powered Portable Applications
n Distributed Power Systems
n Always On Power
Typical Application Circuit
20034608
May 2002
LM3485 Hysteretic PFET Buck Controller
© 2002 National Semiconductor Corporation DS200346 www.national.com
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