UCD9112
www.ti.com
SLVS711 – SEPTEMBER 2006
Digital Dual-Phase Synchronous Buck Controller
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Digital Dual-Phase Synchronous Buck PWM
Controller with 175ps PWM Resolution
Digital Control with Programmable PID
Compensation
Dual-Phase with Current Balancing Capability
VIN from 4.5V to 14.5V (UCD7230)
VOUT from 1% to 99% of VIN
Programmable Switching Frequency, Capable
of up to 2MHz/Phase
Programmable Soft Start and Soft Stop
Supports Pre-Biased Start-Up
Internally Trimmed 0.5% 800mV Reference
Remote Sensing Differential Amplifier
Power-Supply Monitoring via PMBus
Single Bias Supply (3.3V VDD)
Graphical User Interface Configuration
Internal Thermal Sensor
PMBus Support:
– Query Voltage, Current, Faults, etc
– Voltage Setting and Calibration
– Protection Threshold Adjustment
32-Pin QFN Package
APPLICATIONS
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Networking Equipment
Servers
Storage Systems
Telecommunications Equipment
DC Power Distributed Systems
Industrial / ATE
DESCRIPTION
The UCD9112 is dual-phase synchronous buck
digital pulse-width modulation (PWM) controller that
supports point-of-load (POL) applications. The device
is configured through the use of a graphical user
interface (GUI). The loop compensator is
configurable with the GUI to meet dynamic converter
performance, allowing a single hardware design to
cover a broad range of POL applications.
In addition to digital control loops, the UCD9112 is
able to monitor and manage power supply operating
conditions and report the status to the host system
through PMBus. The management parameters are
configurable through the GUI. The GUI also allows
the power supply designer to easily configure the
digital control loop characteristics and generate the
gain and phase information for analysis using Bode
plots.
To ensure balanced outputs on each phase, the
UCD9112 incorporates a current balancing scheme.
The PWM output of the dual phase controller is
capable of operating at a switching frequency of up
to 2MHz with a relative phase adjustment of 180°.
The UCD7230 synchronous buck driver has been
designed to work with the UCD9112 controller to
provide a highly-integrated digital power solution. In
addition to 4A output drive capability, the driver
integrates current limit, short circuit protection as well
as undervoltage lockout protection. The UCD7230
also has a 3.3V, 10mA linear regulator that provides
the supply current for the controller.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
I2C is a trademark of Royal Philips Electronics B.V., The Netherlands.
All other trademarks are the property of their respective owners.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2006, Texas Instruments Incorporated
PRODUCT PREVIEW
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