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ML4865

Fairchild
Part Number ML4865
Manufacturer Fairchild
Description High Voltage High Current Boost Regulator
Published May 7, 2005
Detailed Description www.fairchildsemi.com ML4865 High Voltage High Current Boost Regulator Features • • • • • • • • Guaranteed full load s...
Datasheet PDF File ML4865 PDF File

ML4865
ML4865

Overview
www.
fairchildsemi.
com ML4865 High Voltage High Current Boost Regulator Features • • • • • • • • Guaranteed full load start-up and operation at 1.
8V input Continuous conduction mode for high output current Very low quiescent current Pulse frequency modulation and internal synchronous rectification for high efficiency Maximum switching frequency > 200kHz Minimum external components Low ON resistance internal switching FETs Fixed 12V output can be adjusted to lower output voltages General Description The ML4865 is a high voltage, 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 ML4865 is capable of start-up with input voltages as low as 1.
8V and generates a 12V output with output voltage accuracy of ±4%.
Unlike most boost regulators, the ML4865 isolates the load from the battery when the SHDN pin is high.
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 ML4865 requires only one inductor and two capacitors to build a very small regulator circuit capable of achieving conversion efficiencies approaching 90%.
Block Diagram 4 VL1 6 VL2 SHUTDOWN CONTROL SHDN 7 VIN 3 START-UP SYNCHRONOUS RECTIFIER CONTROL VOUT + – 8 + – SHDN BOOST CONTROL + – FEEDBACK CONTROL 2.
42V SENSE 1 PWR GND 5 GND 2 REV.
1.
0.
2 8/10/01 ML4865 PRODUCT SPECIFICATION Pin Configuration ML4865 8-Pin SOIC (S08) SENSE GND VIN VL1 1 2 3 4 8 7 6 5 VOUT SHDN VL2 PWR GND TOP VIEW Pin Description PIN 1 2 3 4 5 6 7 8 NAME SENSE GND VIN VL1 PWR GND VL2 SHDN VOUT FUNCTION Programming pin for setting the ...


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