MAX8523

High-Speed, Dual-Phase Gate Driver for Multiphase, Step-Down Converters

Highest Accuracy, Scalable, VRD/VRM-10 Power Chipset Reduces Capacitance by 60% in Servers and Desktops

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Overview

6A Peak Gate-Drive Current
Up to 1.2MHz Operation
Up to 6.5V Gate-Drive Voltage
0.5Ω /0.95Ω Low-Side Drivers
Capable of 30A Output per Phase
Adaptive Shoot-Through Protection
User-Programmable Delay Time
TTL and CMOS Input Compatible
UVLO for Proper Sequencing
Flexible 2- to 8-Phase Implementation with MAX8524 and MAX8525
Space-Saving (4.9mm x 6mm) 16-Pin QSOP Package

The MAX8523 dual-phase gate driver, along with the MAX8524/MAX8525 multiphase controllers, provides flexible 2- to 8-phase CPU core-voltage supplies. The 0.5Ω/0.95Ω driver resistance allows up to 30A output current per phase.

Each MOSFET driver in the MAX8523 can drive 3000pF capacitive loads with only 15ns propagation delay and 11ns typical rise and fall times, allowing operations up to 1.2MHz per phase. Adaptive dead time controls low-side MOSFET turn-on, and user-programmable dead time controls high-side MOSFET turn-on. This maximizes converter efficiency while allowing operation with a variety of MOSFETs and controller ICs. An undervoltage lockout (UVLO) circuit allows proper power-on sequencing. PWM_ signal inputs are TTL and CMOS compatible.

The MAX8523 is available in a space-saving 16-pin QSOP package and specified for -40°C to +85°C operation.

Applications