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ML4869 参数 Datasheet PDF下载

ML4869图片预览
型号: ML4869
PDF下载: 下载PDF文件 查看货源
内容描述: 中等电流升压稳压器与负载断开 [Medium Current Boost Regulator with Load Disconnect]
分类和应用: 稳压器
文件页数/大小: 8 页 / 203 K
品牌: MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
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July 2000
PRELIMINARY
ML4869
Medium Current Boost Regulator
with Load Disconnect
GENERAL DESCRIPTION
The ML4869 is a continuous conduction boost regulator
designed for DC to DC conversion in multiple cell battery
power 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 ML4869
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 current and variable
frequency operation result in high efficiency even at light
loads. The ML4869 requires only a few external
components to build a very small regulator capable of
achieving conversion efficiencies approaching 85%.
The SHDN input allows the user to stop the regulator from
switching, and provides complete isolation of the load
from the battery.
FEATURES
s
Guaranteed full load start-up and operation at
1.8V input
Continuous conduction mode for high output current
Pulse Frequency Modulation and internal synchronous
rectification for high efficiency
Isolates the load from the input during shutdown
Minimum external components
Low ON resistance internal switching FETs
Low supply current
5V and 3.3V output versions
Shutdown current = 1µA MAX
s
s
s
s
s
s
s
s
BLOCK DIAGRAM
1
VL1
6
VL2
SHUTDOWN
CONTROL
SHDN
4
VIN
2
START-UP
SYNCHRONOUS
RECTIFIER
CONTROL
VOUT
+
5
+
SHDN
BOOST
CONTROL
+
2.4V
PWR GND
8
GND
3
1