1FEATURES

2• Fully Configurable Multi-Output and Multi-

Phase Non-Isolated DC/DC PWM Controller

• Controls Up to 4 Voltage Rails and Up to 6

Phases

• Supports Switching Frequencies Up to 2MHz

with 250 ps Duty-Cycle Resolution

• Up To 1mV Closed Loop Resolution

• Hardware-Accelerated, 3-Pole/3-Zero

Compensator with Non-Linear Gain for

Improved Transient Performance

• Supports Multiple Soft-Start and Soft-Stop

Configurations Including Prebias Start-up

• Supports Voltage Tracking, Margining and

Sequencing

• Supports Current and Temperature Balancing

for Multi-Phase Power Stages

• Supports Phase Adding/Shedding for

Multi-Phase Power Stages

• Sync In/Out Pins Align DPWM Clocks Between

Multiple UCD92xx Devices

• 12-Bit Digital Monitoring of Power Supply

Parameters Including:

– Input/Output Current and Voltage

– Temperature at Each Power Stage

• Multiple Levels of Over-current Fault

Protection:

– External Current Fault Inputs

– Fast Overcurrent Protection

– Current Continually Digitally Monitored

• Over- and Under-voltage Fault Protection

• Over-temperature Fault Protection

• Enhanced Nonvolatile Memory with Error

Correction Code (ECC)

• Device Operates From a Single Supply with an

Internal Regulator Controller That Allows

Operation Over a Wide Supply Voltage Range

• Supported by Fusion Digital Power™

Designer, a Full Featured PC Based Design

Tool to Simulate, Configure, and Monitor

Power Supply Performance

APPLICATIONS

• Industrial/ATE

• Networking Equipment

• Telecommunications Equipment

• Servers

• Storage Systems

• FPGA, DSP and Memory Power

DESCRIPTION

The UCD9246 is a multi-rail, multi-phase

synchronous buck digital PWM controller designed for

non-isolated DC/DC power applications. This device integrates dedicated circuitry for DC/DC loop

management with flash memory and a serial interface

to support configurability, monitoring and

management.

The UCD9246 was designed to provide a wide

variety of desirable features for non-isolated DC/DC

converter applications while minimizing the total

system component count by reducing external

circuits. The solution integrates multi-loop

management with sequencing, margining, tracking

and intelligent phase management to optimize for

total system efficiency. Additionally, loop

compensation and calibration are supported without the need to add external components.

To facilitate configuring the device, the Texas

Instruments Fusion Digital Power™ Designer is

provided. This PC based Graphical User Interface

offers an intuitive interface to the device. This tool

allows the design engineer to configure the system

operating parameters for the application, store the

configuration to on-chip non-volatile memory and

observe both frequency domain and time domain

simulations for each of the power stage outputs.

TI has also developed multiple complementary power

stage solutions – from discrete drivers in the UCD7k

family to fully tested power train modules in the PTD

family. These solutions have been developed to

complement the UCD9k family of system power

controllers.