TC1313-CL3EMF资料

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TC1313

Features

•Dual-Output Regulator (500mA Buck Regulator and 300mA Low-Dropout Regulator (LDO))•Total Device Quiescent Current = 57µA (Typ.)•Independent Shutdown for Buck and LDO Outputs

•Both Outputs Internally Compensated •Synchronous Buck Regulator:

-Over 90% Typical Efficiency

- 2.0MHz 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=137mV Typ. @

200mA

-Standard Fixed-Output Voltages

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

•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

Applications

•Cellular Phones

•Portable Computers

•USB-Powered Devices

•Handheld Medical Instruments

•Organizers and PDAs Description

The TC1313 combines a 500mA synchronous buck regulator and 300mA Low-Dropout Regulator (LDO) to provide a highly integrated solution for devices that require multiple supply voltages. The unique combina-tion 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 500mA synchronous buck regulator switches at a fixed frequency of 2.0MHz 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 300mA auxiliary output that requires a single 1µF ceramic output capacitor, minimizing board area and cost. The typical dropout voltage for the LDO output is 137mV for a 200mA load.

The TC1313 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 TC1313 standard parts, consult your Microchip representative.

Package Type

10-Lead DFN

SHDN2

V IN2

V OUT2

A GND

P GND

L X

V IN1

SHDN1

V FB1/V OUT1

10-Lead MSOP