TC1303B-CF0EUN datasheet, PDF - EEWORLD Datasheet

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TC1303B-CF0EUN: Description0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10; CategoryPower/power management; File Size431KB，30 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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TC1303B-CF0EUN Overview

0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10

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TC1303B

500 mA Synchronous Buck Regulator,

+ 300 mA LDO with Power-Good Output

Features

• Dual-Output Regulator (500 mA Buck Regulator

and 300 mA Low-Dropout Regulator)

• Power-Good Output with 300 ms Delay

• Total Device Quiescent Current = 65 µA, Typ.

• Independent Shutdown for Buck and LDO

Outputs

• Both Outputs Internally Compensated

• Synchronous Buck Regulator:

- Over 90% Typical Efficiency

- 2.0 MHz Fixed Frequency PWM

(Heavy Load)

- Low Output Noise

- Automatic PWM to PFM mode transition

- Adjustable (0.8V to 4.5V) and Standard Fixed

Output Voltages (0.8V, 1.2V, 1.5V, 1.8V, 2.5V,

3.3V)

• Low-Dropout Regulator:

- Low-Dropout Voltage = 137 mV Typ. @

200 mA

- Standard Fixed Output Voltages

(1.5V, 1.8V, 2.5V, 3.3V)

• Power-Good Function:

- Monitors LDO Output Function (TC1303B)

- 300 ms Delay Used for Processor Reset

• Small 10-pin 3X3 DFN or MSOP Package

Options

• Operating Junction Temperature Range:

- -40°C to +125°C

• Undervoltage Lockout (UVLO)

• Output Short Circuit Protection

• Overtemperature Protection

Description

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 lowest system cost for

dual-output voltage applications that require one lower

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-size solution. When the

load on the buck output is reduced to light levels, it

changes operation to a Pulse Frequency Modulation

(PFM) 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. The 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.

The TC1303B is available in either the 10-pin DFN or

MSOP package.

Additional protection features include: UVLO,

overtemperature and overcurrent protection on both

outputs.

For a complete listing of TC1303B standard parts, con-

sult your Microchip representative.

Applications

•

Cellular Phones

Portable Computers

USB Powered Devices

Handheld Medical Instruments

Organizers and PDAs

Package Type

10-Lead DFN

SHDN2 1

IN2

OUT2

PG 4

GND

10 P

GND

9 L

8 V

IN1

7 SHDN1

6 V

FB1

OUT1

10-Lead MSOP

SHDN2 1

IN2

OUT2

PG 4

GND

10 P

GND

9 L

8 V

IN1

7 SHDN1

6 V

FB1

OUT1

2005 Microchip Technology Inc.

DS21949A-page 1

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