ML4863

Features:

n Variable frequency current mode control and synchronous rectification for high efficiency
n Minimum external components
n Guaranteed start-up and operation over a wide input voltage range (3.15V to 15V)
n High frequency operation (>200kHz) minimizes the size of the magnetics
n Flyback topology allows multiple outputs in addition to the regulated 5V
n Built-in overvoltage and current limit protection


Pinout




Specifications

VIN ................................................... GND 0.3V to 18V
Voltage on any other pin ................... GND 0.3V to 7V
Source or Sink Current (OUT1 & OUT2) ...................... 1A
Junction Temperature ............................................150ºC
Storage Temperature Range................. 65ºC to 150ºC
Lead Temperature (Soldering 10 Sec.) .................. 260ºC
Thermal Resistance (qJA) .................................. 160ºC/W


Description

The ML4863 is a flyback controller designed for use in multi-cell battery powered systems such as PDAs and notebook computers. The flyback topology is ideal for systems where the battery voltage can be either above or below the output voltage, and where multiple output voltages are required.

The ML4863 uses the output voltage as the feedback control signal to the current mode variable frequency flyback controller. In addition, a synchronous rectifier control output is supplied to provide the highest possible conversion efficiency (greater than 85% efficiency over a 1mA to 1A load range).

The ML4863 has been designed to operate with aminimum number of external components to optimize space and cost.