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CHL8505 Datasheet(PDF) 1 Page - International Rectifier |
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CHL8505 Datasheet(HTML) 1 Page - International Rectifier |
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1 / 15 page  High‐Efficiency 5V MOSFET Gate Driver CHL8505 December 6, 2011 | FINAL | V1.05 1 FEATURES Ideal for Server Memory applications using +5V Fixed 5V Gate Drive Large drivers designed to drive 3nF in < 15ns with +5V drive Low‐side driver – 2A source/4A sink High‐side driver – 2A source/2A sink Transitions times & Propagation delays < 15ns Integrated bootstrap diode Capable of high switching frequencies from 200kHz up to greater than 1MHz Compatible with IR’s patented Active Tri‐Level (ATL) PWM for fastest response to transient overshoot Non‐overlap and under voltage protection Thermally enhanced 10‐pin DFN package Lead free RoHS compliant package Low Quiescent power to optimize efficiency APPLICATIONS Multiphase synchronous buck converter for Server CPUs and DDR Memory VR solutions High efficiency and compact VRM Optimized for Sleep state S3 systems using +5VSB Notebook Computer and Graphics VR solutions BASIC APPLICATION Figure 1: CHL8505 Basic Application Circuit DESCRIPTION The CHL8505 MOSFET is a high‐efficiency gate driver which can switch both high‐side and low‐side N‐channel external MOSFETs in a synchronous buck converter. It is intended for use with IR Digital PWM controllers to provide a total voltage regulator (VR) solution for today’s advanced computing applications. The CHL8505 driver is capable of rapidly switching large MOSFETs with low Rdson and large input capacitance used in high‐efficiency designs. It is uniquely designed to operate from a 5V source such as a system 5V or 5V standby voltages in sleep states. The CHL8505 has a unique circuit which improves drive strength to the external MOSFETs even with just 5V supplied at the VDRV pin. This insures faster switching comparable to drivers designed for +12V drive operation. The integrated boot diode reduces external component count. The CHL8505 also features an adaptive non‐overlap control for shoot‐through protection. The CHL8505 is configured to drive both the high and low‐ side switches from the patented IR fast Active Tri‐Level (ATL) PWM signal, which will optimize the turn off time of individual phases, optimizing transient performance. PIN DIAGRAM Top View GND Pin 11 3x3 DFN NC BOOT LO_GATE HI_GATE NC PWM VCC NC SWITCH VDRV 6 7 8 9 10 5 4 3 2 1 Figure 2: CHL8505 Package Top View |
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