电子元器件数据表 IC PDF查询
English 中文版
  品牌   我要上传
型号:  
描述:
ML4890ES-T High Efficiency, Low Ripple Boost Regulator
型号:   ML4890ES-T
PDF文件: 下载PDF文件   鼠标右键选目标另存为
网页直接浏览   不需安装PDF阅读软件
在线打开PDF文件   需安装PDF阅读软件
描述:   High Efficiency, Low Ripple Boost Regulator
文件大小 :   201 K    12 页
Logo:   
品牌   MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
购买 :   
  浏览型号ML4890ES-T的Datasheet PDF文件第2页 浏览型号ML4890ES-T的Datasheet PDF文件第3页 浏览型号ML4890ES-T的Datasheet PDF文件第4页 浏览型号ML4890ES-T的Datasheet PDF文件第5页 浏览型号ML4890ES-T的Datasheet PDF文件第6页 浏览型号ML4890ES-T的Datasheet PDF文件第7页 浏览型号ML4890ES-T的Datasheet PDF文件第8页 浏览型号ML4890ES-T的Datasheet PDF文件第9页  
100%
C
ed C
to 70°
ent
Extend
–20°C held Equipm
and
table H
for Por
FE
ommercial Te
G
URIN
ure Range
AT
mperat
April 1997
ML4890
High Efficiency, Low Ripple Boost Regulator
GENERAL DESCRIPTION
The ML4890 is a high efficiency, PFM (Pulse Frequency
Modulation), boost switching regulator connected in
series with an integrated LDO (Low Dropout Regulator)
that incorporates “Silent Switcher™” technology. This
technique incorporates a patented tracking scheme to
minimize the voltage drop across the LDO and increase
the total efficiency of the regulator beyond that which can
be obtained by using a discrete external LDO regulator.
The ML4890 is designed to convert single or multiple cell
battery inputs to regulated output voltages for integrated
circuits and is ideal for portable communications
equipment that cannot tolerate the output voltage ripple
normally associated with switching regulators.
An integrated synchronous rectifier eliminates the need for
an external Schottky diode and provides a lower forward
voltage drop, resulting in higher conversion efficiency.
FEATURES
s
s
Incorporates “Silent Switcher™” technology to deliver
very low output voltage ripple (typically 5mV)
Guaranteed full load start-up and operation at 1.0V
input and low operating quiescent current (<100µA)
for extended battery life
Pulse Frequency Modulation and internal synchronous
rectification for high efficiency
Minimum external components
Low ON resistance internal switching MOSFETs
5V, 3.3V, and 3V output versions
s
s
s
s
BLOCK DIAGRAM
L1
*C
IN
V
IN
C2
1
V
L
6
5
V
BOOST
V
BAT
7
SHDN
V
OUT
4
BOOST
CONTROL
FEEDBACK
LDO
CONTROL
C1
V
OUT
+
2
V
REF
3
FROM
POWER
MANAGEMENT
GND
PWR
GND
8
Patent Pending
*Optional
1
首页 - - 友情链接
Copyright© 2001 - 2014 ICPDF All Rights Reserved ICPDF.COM

粤公网安备 44030402000629号


粤ICP备13051289号-7