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TC1303A

Microchip Technology
Part Number TC1303A
Manufacturer Microchip Technology
Description (TC1303 / TC1304) 500 mA Synchronous Buck Regulator
Published Jun 9, 2008
Detailed Description TC1303A/TC1303B/ TC1303C/TC1304 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output Features • Dual-O...
Datasheet PDF File TC1303A PDF File

TC1303A
TC1303A


Overview
TC1303A/TC1303B/ TC1303C/TC1304 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 www.
DataSheet4U.
com • Total Device Quiescent Current = 65 µA, Typ.
• Independent Shutdown for Buck and LDO Outputs (TC1303) • 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 Buck Output Function (TC1303A) - Monitors LDO Output Function (TC1303B) - Monitors Both Buck and LDO Output Functions (TC1303C and TC1304) - 300 ms Delay Used for Processor Reset • Sequenced Startup and Shutdown (TC1304) • 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 TC1303/TC1304 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 quiesce...


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