Microchip Technology TC1303BDM-DDBK1 ユーザーズマニュアル
TC1303B DUAL-OUTPUT
REGULATOR USER’S GUIDE
©
2005 Microchip Technology Inc.
DS51563A-page 5
Chapter 1. Product Overview
1.1
INTRODUCTION
The TC1303B Dual-Output Regulator with Power-Good Output Demo Board is used to
demonstrate the operation of the TC1303B. The TC1303B combines a 500 mA
synchronous buck regulator and 300 mA Low-Dropout Regulator (LDO) with a
power-good monitor to provide a highly integrated solution for devices that require
multiple supply voltages. The unique combination of an integrated buck switching
regulator and low-dropout linear regulator provides the smallest, lowest system cost for
dual-output voltage applications, with one low processor core voltage and one higher
bias voltage.
demonstrate the operation of the TC1303B. The TC1303B combines a 500 mA
synchronous buck regulator and 300 mA Low-Dropout Regulator (LDO) with a
power-good monitor to provide a highly integrated solution for devices that require
multiple supply voltages. The unique combination of an integrated buck switching
regulator and low-dropout linear regulator provides the smallest, lowest system cost for
dual-output voltage applications, with one low processor core voltage and one higher
bias voltage.
The 500 mA synchronous buck regulator switches at a fixed frequency of 2.0 MHz when
the load is heavy, providing a low noise, small solution. When the load on the buck
output is reduced to light levels, it changes operation to a pulse frequency modulation
mode to minimize quiescent current draw from the battery. No intervention is necessary
for smooth transition from one mode to another.
the load is heavy, providing a low noise, small solution. When the load on the buck
output is reduced to light levels, it changes operation to a pulse frequency modulation
mode to minimize quiescent current draw from the battery. No intervention is necessary
for smooth transition from one mode to another.
The LDO provides a 300 mA auxiliary output that requires a single 1 µF ceramic output
capacitor, minimizing board area and cost. Typical dropout voltage for the LDO output
is 137 mV for a 200 mA load.
capacitor, minimizing board area and cost. Typical dropout voltage for the LDO output
is 137 mV for a 200 mA load.
For the TC1303B, the power-good output logic level is based on the regulation of the
LDO output only. The buck regulator can be turned on and off without affecting the
power-good signal.
LDO output only. The buck regulator can be turned on and off without affecting the
power-good signal.
This chapter covers the following topics:
• What is the TC1303B Dual-Output Regulator with Power-Good Output Demo
Board?
• What the TC1303B Dual-Output Regulator with Power-Good Output Demo Board
kit includes