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TC1303B Datasheet(PDF) 1 Page - Microchip Technology |
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TC1303B Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 30 page  © 2005 Microchip Technology Inc. DS21949A-page 1 TC1303B 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 Applications • Cellular Phones • Portable Computers • USB Powered Devices • Handheld Medical Instruments • Organizers and PDAs 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. Package Type 10-Lead DFN 1 2 6 8 7 9 10 5 4 3 SHDN2 VIN2 VOUT2 AGND PGND LX VIN1 SHDN1 VFB1/VOUT1 PG 10-Lead MSOP 1 2 6 8 7 9 10 5 4 3 SHDN2 VIN2 VOUT2 AGND PGND LX VIN1 SHDN1 VFB1/VOUT1 PG 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
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