General Description

The MAX1530/MAX1531 multiple-output power-supply controllers generate all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) monitors. Both devices include a high-efficiency, fixed-frequency, step-down regulator. The low-cost, all N-channel, synchronous topology enables operation with efficiency as high as 93. High-frequency operation allows the use of small inductors and capacitors, resulting in a compact solution. The MAX1530 includes three linear regulator controllers and the MAX1531 includes five linear regulator controllers for supplying logic and LCD bias voltages. A programmable startup sequence enables easy control of the regulators.

Features

♦ 4.5V to 28V Input Voltage Range

♦ 250kHz/500kHz Current-Mode Step-Down Converter

   Small Inductor/Capacitors

   No Sense Resistor

♦ Three Positive Linear Regulator Controllers

   One Positive and One Negative Additional

   Controller (MAX1531)

   Small Input and Output Capacitors

♦ Timed Reset Output

♦ Uncommitted Overcurrent Protection (MAX1531)

♦ Soft-Start for All Regulators

♦ Programmable Input Undervoltage Comparator

♦ Programmable Startup Sequencing