TC7750FTG Digital Step-Down DC/DC Converter IC (Under Development)

The TC7750FTG is a digital step-down DC/DC converter, which combines a driver and MOSFETs in a single package. Use of the new DC/DC converter achieves a small-footprint solution for point-of-load (POL) power designs. It supports POLA-compliant communications with a host controller.

Photos of the TC7750FTG, a digital step-down DC/DC converter

Features and General Specifications
Target Applications
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Features and General Specifications

PMBus Communication

The TC7750FTG provides communications with a host controller via the POLA-compliant PMBus. The output voltage and the input voltage, current and temperature thresholds for monitoring functions can be programmed via the PMBus to suit the user's needs. The PMBus is an I²C-based three-wire communications protocol that uses the CLK, DATA and ALT signals.

This figure shows PMBus-compliant communications between the TC7750FTG and a host controller.

Detection, Protection and Shutdown Features

The TC7750FTG contains a 10-bit A/D converter to convert the input voltage, output voltage, output current and device temperature into digital values for automatic performance optimization via a feedback loop. The voltage, current and temperature thresholds are user-programmable to suit the conditions of the use environment. The TC7750FTG has the following detect and protect functions.

Function	Detection	Protection
Output undervoltage	Y	-
Output overvoltage	Y	-
RMS output over current	Y	Y
Input undervoltage	Y	Y
Input overvoltage	Y	Y
Overtemperature	Y	Y
Thermal shutdown	-	Y
Overcurrent shutdown	-	Y

Packaging

The TC7750FTG is housed in a small QFN28 package. Use of the TC7750FTG will lead to a compact POL power design that occupies very little board space of a power supply unit.

Package outline dimensions of the small QFN28 package in which the TC7750FTG is housed

General Specifications

Part Nnumber	TC7750FTG
Pacakge	QFN28 (0.4-mm lead pitch)
Input voltage	V_IN = 2.7 V to 5.5 V
Output voltage	V_OUT = 0.6 V to V_IN-0.3 V (@ 750 kHz)
Output current	3 A (max)
PWM frequency	Selectable from 750 kHZ and 1.5 MHz
Other	Non-insulated On-chip MOS gate driver and MOSFETs Nonvolatile memory for register data storage
Operation temperature	Ta = -30℃ to 85℃
Production schedule	March 2011(Mass-production target)