CHL8500 – Synchronous Buck MOSFET Driver

CHL8500 Product Brief (pdf)

CHL8500 Product Datasheet (pdf) registered users only

FEATURES

• Short transitions times & propagation delays, less than 20ns
• Drives both high and low side MOSFETs in synchronous buck configuration
• Patented Tri-Level PWM input to disable both MOSFETs within < 30ns, with no hold-off time
• Advanced Adaptive non-overlap protection minimizes diode conduction time
• Allows high switching frequencies to 1MHz
• Pre-POR protection with tri-state operation
• Input supply under voltage protection
• Available in 8 pin SOIC and thermally enhanced 10 pin DFN package
• Lead free RoHS complaint

DESCRIPTION

The CHL8500 is a high performance N-channel MOSFET gate driver specially designed to drive both the high-side and low side external MOSFETs in a synchronous buck power converter. It is designed to interface with the CHiL digital PWM controllers.

The CHL8500 incorporates a unique patented fast tri-level PWM input allowing for fast disable of driver outputs based on a tri-level PWM signal voltage level without the need for a dedicated disable pin or hold off time. This delivers improved transient performance and VR efficiency; especially in the power saving PSI mode. Propagation and transition times are less than 20ns for each driver into a 3nF load. The low side drive is designed for a 3A sink current.

This driver features a variable adaptive non overlap control providing shoot through protection which prevents both high-side and low-side MOSFETs from conduction at the same time and shorting the core voltage to ground. This advanced non-overlap technique minimizes the body diode conduction time and provides best in class efficiency. The CHL8500 has an over-voltage protection in the event of a high-side MOSFET short before startup.

APPLICATIONS

Typical Application

• High current DC/DC Converters
• Multiphase synchronous buck converter for desktop computers using Intel® VR11.x microprocessors
• High efficiency and compact VRM

RELATED DEVICES

• CHL8100 - 4 Phase Intelligent Digital PWM Controller

ORDERING INFORMATION