MAX1531 - Maxim Integrated Products

MAX1531 Multiple-Output Power-Supply Controllers

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 operat.

Features

o 4.5V to 28V Input Voltage Range o 250kHz/500kHz Current-Mode Step-Down Converter Small Inductor/Capacitors No Sense Resistor o Three Positive Linear Regulator Controllers One Positive and One Negative Additional Controller (MAX1531) Small Input and Output Capacitors o Timed Reset Output o Uncommitted Overcurrent Protection (MAX1531) o Soft-Start for All Regulators o Programmable Input Undervoltage Comparator o Programmable Startup Sequencing MAX1530/MAX1531 Minimal Operating Circuit VP VIN VIN VN VL CSH CSL VIN = 12V BST IN VOUT 3.3V/1.5A DH LX DL PGND EN ILIM FREQ VL AGND VL DRV4 FBL4 VS.