CHL8515_15 Datasheet, PDF (1/16 Pages) International Rectifier – High‐Efficiency Variable Gate MOSFET Driver

High‐Efficiency Variable Gate MOSFET Driver _CHL8515
FEATURES
 Ideal for Server Memory applications using +5V
 Separate HVCC and LVCC capable of drive voltages
from 4.0 to 13.2V for optimal system efficiency
 Adjustable thermal warning flag for phase‐by‐
phase thermal protection
 Large drivers designed to drive 3nF in < 10ns with
any voltage from 5V to 12V (typ) supplied to the
HVCC and LVCC pins
 Low‐side driver – 2A source/4A sink
 High‐side driver – 2A source/2A sink
 Transitions times & Propagation delays < 10ns
 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
DESCRIPTION
The CHL8515 MOSFET driver 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 CHL8515 driver is capable of rapidly switching large
MOSFETs with low R_dson and large input capacitance used
in high‐efficiency designs. It is uniquely designed to
operate from a 5V source, minimizing load current.
It also has separate HVCC and LVCC drive inputs, capable
of 4.0V to 13.2V operation. Used in conjunction with IR’s
Variable Gate Drive controller feature, or a 5V standby
source in sleep mode, maximum power stage efficiency
can be attained.
The CHL8515 has a unique circuit which maintains drive
strength to the external MOSFETs regardless of the drive
voltage, insuring fast switching even at 5V as the drive
voltage. The integrated boot diode reduces external
component count. The CHL8515 also features an adaptive
non‐overlap control for shoot‐through protection.
The CHL8515 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.
Phase‐by‐phase thermal protection can be set from 61C
to 150C with a simple resistor setting, and a thermal flag
can be used to implement a thermal warning or thermal
shutdown of the system by connecting OT# pins together
and to the system enable in multiphase applications.
PIN DIAGRAM
Figure 1: CHL8515 Basic Application Circuit
1 December 6, 2011 | FINAL | V1.05
Figure 2: CHL8515 Package Top View