RT9627A Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – High Voltage Synchronous Rectified Dual-Channel Buck MOSFET Driver for Notebook Computer

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RT9627A
High Voltage Synchronous Rectified Dual-Channel Buck
MOSFET Driver for Notebook Computer
General Description
The RT9627A is a high frequency, dual-channel driver
specifically designed to drive two power N-MOSFETs in
each channel of a synchronous-rectified Buck converter
topology. It is especially suited for mobile computing
applications that require high efficiency and excellent
thermal performance. This driver, combined with Richtek's
series of multi-phase Buck PWM controllers, provides a
complete core voltage regulator solution for advanced
microprocessors.
The drivers are capable of driving a 3nF load with fast
rising/falling time and fast propagation delay. This device
implements bootstrapping on the upper gates with only a
single external capacitor. This reduces implementation
complexity and allows the use of higher performance, cost
effective, N-MOSFETs. Adaptive shoot through protection
is integrated to prevent both MOSFETs from conducting
simultaneously.
Features
z Dual-Channel Driver
z Each Channel Drives Two N-MOSFETs
z Adaptive Shoot-Through Protection
z 0.5Ω On-Resistance, 4A Sink Current Capability
z Supports High Switching Frequency
z Tri-State PWM Input for Power Stage Shutdown
z Output Disable Function
z Integrated Boost Switch
z Low Bias Supply Current
z VCC POR Feature Integrated
z RoHS Compliant and Halogen Free
Applications
z Core Voltage Supplies for Intel^® / AMD^® Mobile
Microprocessors
z High Frequency Low Profile DC/DC Converters
z High Current Low Output Voltage DC/DC Converters
z High Input Voltage DC/DC Converters
Simplified Application Circuit
R1
V_CC
RT9627A
VCC
C1
UGATE1
R2 ^C2
Q_UG1
V_IN
C_IN
BOOT1
L2
PHASE1
V_CORE
Q_LG1
C3
C_OUT
Enable
EN
LGATE1
R5
PWM1
PWM2
PWM1
UGATE2
PWM2 ^BOOT2
PHASE2
GND LGATE2
R5 ^C15
V_IN
Q_UG2
L3
Q_LG2
C16
R8
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS9627A-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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