CHL8510 – High Efficiency 6A Buck MOSFET Driver

CHL8510 Preliminary Product Brief (pdf)

CHL8510 Preliminary Product Datasheet (pdf) registered users only

FEATURES

• Large low side driver - 6A sink current
• Drives 6nF server class MOSFETs with short transitions times & propagation delays, <20ns
• Independent variable gate voltage for both high and low side - improves efficiency
• Selectable PWM mode of operation for CHiL ATL or generic tristate
  • Patented Active Tri-Level (ATL) PWM input disables both MOSFETs within 30ns, with no hold-off time
• Integrated bootstrap diode
• Adaptive non-overlap protection minimizes diode conduction time
• Input supply under voltage protection
• Thermally enhanced 10 pin DFN package
• Lead free RoHS complaint

DESCRIPTION

The CHL8510 is a high performance N-channel MOSFET gate driver specially designed to interface with the CHiL digital multiphase PWM controllers for server and gamer/ overclocking applications. Its features are designed to deliver best in class performance and system efficiency.

The large low and high side gate drivers of CHL8510 enable rapid switching of both the large input capacitance ( up to 6nF) and low Rds_on MOSFETs in a synchronous buck power converter. The low side drive is designed for a 6A sink current.

The CHL8510 allows independent control of both high and low side gate drive voltages from 4.5V to 13.5V. When used with the VGD (Variable Gate Drive) technology of CHiL digital controllers, it optimizes system efficiency across the output load range. CHL8510 supports two selectable PWM modes of operation - the unique patented CHiL ATL (Active Tri-Level) and the generic tristate PWM voltage signals. Both the PWM modes eliminate the need for a dedicated disable pin. The CHiL ATL mode does not require a PWM hold-off time and therefore provides rapid disable of driver outputs. This delivers improved performance during load transients and increased VR efficiency; especially in the power saving PSI mode. Propagation and transition times are less than 20ns for each driver into a 6nF load.

An integrated boot diode reduces external component count. CHL8510 features an advanced variable adaptive non-overlap control providing shoot-through protection. This prevents cross conduction of high-side and low-side MOSFETs while minimizes the body diode conduction time and provides best in class efficiency.

APPLICATIONS

Typical Application

• High current Server and Gamer VRs
• High efficiency and compact VRM
• Multiphase synchronous buck converter for desktop computers using Intel® VR11.x microprocessors

RELATED DEVICES

• CHL8318 - 8 Phase Digital PWM Controller
• CHL8316 - 6 Phase Digital PWM Controller

ORDERING INFORMATION