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參數(shù)資料
| 型號： | ML4875 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓關(guān)斷穩(wěn)壓器（帶關(guān)斷電路的大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/10頁 |
| 文件大小： | 188K |
| 代理商： | ML4875 |
July 2000
ML4875
Low Voltage Boost Regulator with Shutdown
1
BLOCK DIAGRAM
+
–
PWR
GND
3
1
L1
V
BAT
V
IN
GND
V
L
C
OUT
7
2
8
REGULATION
&
SHUTDOWN
CONTROL
REF
4
FROM POWER
MANAGEMENT
*R
A
*R
B
FEEDBACK
5
V
OUT
DETECT
SHDN
6
BOOST
CONTROL
*C
IN
V
OUT
RESET
5V
GENERAL DESCRIPTION
The ML4875 is a boost regulator designed for DC to DC
conversion in 1 to 3 cell battery powered systems. The
combination of BiCMOS process technology, internal
synchronous rectification, variable frequency operation,
and low supply current make the ML4875 ideal for 1 cell
applications. The ML4875 is capable of start-up with input
voltages as low as 1V and is available in 5V, 3.3V, and 3V
output versions with an output voltage accuracy of ±3%.
Unlike regulators using external Schottky diodes, the
ML4875 isolates the load from the battery when the
SHDN pin is high. This is accomplished by an integrated
synchronous rectifier which eliminates the need for an
external Schottky diode and provides a lower forward
voltage drop, resulting in higher conversion efficiency. In
addition, low quiescent battery current and variable
frequency operation result in high efficiency even at light
loads. The ML4875 requires only one inductor and two
capacitors to build a very small regulator circuit capable
of achieving conversion efficiencies in excess of 90%.
The circuit contains a
RESET
output which goes low when
the DETECT input drops below 200mV.
FEATURES
I
Guaranteed start-up and operation at 1V input
I
Pulse Frequency Modulation and Internal Synchronous
Rectification for high efficiency
I
Isolates the load from the input during shutdown
I
Minimum external components
I
Low ON resistance internal switching FETs
I
Micropower operation
I
5V, 3.3V, and 3V output versions
*Optional
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4875CS-3 | 制造商:Rochester Electronics LLC 功能描述: |
| ML4875CS-5 | 制造商:Rochester Electronics LLC 功能描述: |
| ML4875CS-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ML4875ES-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Low Voltage Boost Regulator with Shutdown |
| ML4875ES-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Low Voltage Boost Regulator with Shutdown |
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