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參數(shù)資料
| 型號： | ML4851 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Low Current, Voltage Boost Regulator(小電流升壓穩(wěn)壓器) |
| 中文描述： | 低電流，電壓升壓穩(wěn)壓器（小電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 141K |
| 代理商： | ML4851 |
ML4851
Low Current, Voltage Boost Regulator
BLOCK DIAGRAM
GENERAL DESCRIPTION
The ML4851 is a low power boost regulator designed for
DC to DC conversion in 1 to 3 cell battery powered
systems. The maximum switching frequency can exceed
100kHz, allowing the use of small, low cost inductors.
The combination of BiCMOS process technology, internal
synchronous rectification, variable frequency operation,
and low supply current make the ML4851 ideal for 1 cell
applications. The ML4851 is capable of start-up with input
voltages as low as 1V and is available in 5V and 3.3V
output versions with 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 ML4851 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 also contains a
RESET
output which goes low
when the IC can no longer function due to low input
voltage, or when the DETECT input drops below 200mV.
FEATURES
n
Guaranteed full load start-up and operation at 1V input
n
Maximum switching frequency > 100kHz
n
Pulse Frequency Modulation (PFM) and internal
synchronous rectification for high efficiency
n
Minimum external components
n
Low ON resistance internal switching FETs
n
Micropower operation
n
5V and 3.3V output versions
FEATURING
Extended Commercial Temperature Range
-20C to 70C
for Portable Handheld Equipment
VREF
VOUT
VL
5
VIN
1
DETECT
4
PWR
GND
8
VREF
6
RESET
VREF
–
+
+
–
S
R
Q
Q
5μs
ONE SHOT
START-UP
REFERENCE
2
GND
3
VREF
+
COMP
–
7
REV. 1.0 10/12/2000
相關(guān)PDF資料 |
PDF描述 |
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| ML4854IT | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
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| ML4861 | Low Voltage Drop Boost Regulator(低壓差升壓穩(wěn)壓器) |
| ML4863 | High Efficiency Flyback Controller(高效回轉(zhuǎn)電源控制器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4851CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Low Current, Voltage Boost Regulator |
| ML4851CS3X | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4851CS3X_NL4C0095 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4851CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Low Current, Voltage Boost Regulator |
| ML4851CS8-3 UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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