Description

The SC2463 is a high performance controller for multi output converters that can be configured for a wide variety of applications. The SC2463 utilizes PWM synchronous buck topologies where efficiency is most important. It also provides two dedicated programmable positive linear regulators using external transistors. Each of the four outputs is adjustable down to 0.5V. The two PWM switchers are synchronized 180° out of phase reducing input ripple, allowing for fewer input capacitors. Power up sequencing prevents converter latch-up.

The SC2463 can be synchronized to other converters to prevent beat frequencies. The wide range programmable operating frequency allows users to optimize a converter design. The PWM switchers sense the voltage across the low-side MOSFETs on-resistance to efficiently provide adjustable current-limit, eliminating costly current-sense resistors. A POK signal is issued when soft-start is complete on both PWM switchers and their outputs are within 10 of the set point.

Features

♦ Two synchronized converters for low noise

♦ Power up sequencing to prevent latch-up

♦ Out of phase operation for low input ripple

♦ Over current protection

♦ Wide input range, 4.5 to 30V

♦ Programmable frequency up to 700kHz

♦ Low shutdown current 100uA

♦ Two synchronous bucks for high efficiency at high current

♦ Two programmable positive linear regulators

♦ Output voltage as low as 0.5V

♦ Small package TSSOP-28. This product is fully WEEE and RoHS compliant

Applications

♦ DSL applications with multiple input voltage requirements

♦ Mixed-Signal applications requiring 4 positive output voltages

♦ Cable modem power management

♦ Base station power management