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參數(shù)資料
| 型號： | ML4870 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator with Load Disconnect(負載可分離的大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓穩(wěn)壓器與負載斷開（負載可分離的大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 80K |
| 代理商： | ML4870 |
July 2000
PRELIMINARY
ML4870
High Current Boost Regulator with Load Disconnect
GENERAL DESCRIPTION
The ML4870 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 ML4870
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 addtion, low quiescent current and variable
frequency operation result in high efficiency even at light
loads. The ML4870 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.
BLOCK DIAGRAM
FEATURES
I
Guaranteed full load start-up and operation at
1.8V input
I
Continuous conduction mode for high output current
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
Low supply current
I
5V and 3.3V output versions
VL2
5
VOUT
6
+
–
SHUTDOWN
CONTROL
4
SHDN
VIN
2
2.4V
START-UP
3
GND
VL1
1
SYNCHRONOUS
RECTIFIER
CONTROL
BOOST
CONTROL
SHDN
+
–
+
–
8
PWR GND
REV. 1.0 10/12/2000
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