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參數(shù)資料
| 型號： | ML4871 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator(大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓穩(wěn)壓器（大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 237K |
| 代理商： | ML4871 |
GENERAL DESCRIPTION
The ML4871 is a continuous conduction boost regulator
designed for DC to DC conversion in multiple cell battery
powered systems. Continuous conduction allows the
regulator to maximize output current for a given inductor.
The maximum switching frequency can exceed 200kHz,
allowing the use of small, low cost inductors. The ML4871
is capable of start-up with input voltages as low as 1.8V
and is available in 5V and 3.3V output versions with an
output voltage accuracy of ±3%.
An integrated synchronous rectifier 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 ML4871 requires only one inductor and two
capacitors to build a very small regulator circuit capable
of achieving conversion efficiencies approaching 90%.
The circuit also contains a
RESET
output which goes low
when the DETECT input drops below 1.25V.
BLOCK DIAGRAM
July 2000
ML4871
High Current Boost Regulator
1
FEATURES
I
Guaranteed full load start-up and operation
at 1.8V Input
I
Continuous conduction mode for high output current
I
Very low supply current (20μA output referenced) for
Micropower operation
I
Pulse Frequency Modulation and Internal Synchronous
Rectification for high efficiency
I
Maximum switching frequency > 200kHz
I
Minimum external components
I
Low ON resistance internal switching FETs
I
5V and 3.3V output versions
VL2
5
VOUT
6
+
–
VIN
2
1.25V
START-UP
3
GND
VL1
1
DETECT
4
SYNCHRONOUS
RECTIFIER
CONTROL
BOOST
CONTROL
+
–
+
–
8
PWR GND
RESET
VREF
+
COMP
–
7
FEATURING
Extended Com-20C to 70C
for Portable Handheld Equipment
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4871CS3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4871CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871ES-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871ES5 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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