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參數(shù)資料
| 型號： | ML4890 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Efficiency, Low Ripple Boost Regulator(輸出可調(diào)、小波紋升壓穩(wěn)壓器) |
| 中文描述： | 高效率，低紋波升壓穩(wěn)壓器（輸出可調(diào)，小波紋升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 166K |
| 代理商： | ML4890 |
FEATURING
Extended Commercial Temperature Range
for Portable Handheld Equipment
BLOCK DIAGRAM
April 1997
ML4890
High Efficiency, Low Ripple Boost Regulator
1
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
I
Incorporates “Silent Switcher” technology to deliver
very low output voltage ripple (typically 5mV)
I
Guaranteed full load start-up and operation at 1.0V
input and low operating quiescent current (<100
μ
A)
for extended battery life
I
Pulse Frequency Modulation and internal synchronous
rectification for high efficiency
I
Minimum external components
I
Low ON resistance internal switching MOSFETs
I
5V, 3.3V, and 3V output versions
BOOST
CONTROL
4
8
3
1
2
6
L1
SHDN
V
REF
V
IN
GND
FEEDBACK
V
L
C1
+
–
V
OUT
PWR
GND
FROM
POWER
MANAGEMENT
*C
IN
V
BAT
7
LDO
CONTROL
5
V
BOOST
C2
V
OUT
Patent Pending
*Optional
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| ML4894 | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補償控制器（5.9V～15V到5V變換）) |
| ML4895 | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補償控制器（5.9V～15V到2.5V～4V變換）) |
| ML4900 | High Current Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的大電流同步補償控制器（5V到2.1V～3.5V變換）) |
| ML4901 | High Current Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的大電流同步補償控制器（12V到2.1V～3.5V變換）) |
| ML4902 | High Current Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的大電流同步補償控制器（5V到1.8V～3.5V變換）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4890CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Efficiency, Low Ripple Boost Regulator |
| ML4890CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Efficiency, Low Ripple Boost Regulator |
| ML4890CST | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ML4890CS-T | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Efficiency, Low Ripple Boost Regulator |
| ML4890CSTX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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