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TC1313-AA0EMF Datasheet(PDF) 1 Page - Microchip Technology |
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TC1313-AA0EMF Datasheet(HTML) 1 Page - Microchip Technology |
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© 2005 Microchip Technology Inc. DS21974A-page 1 TC1313 Features • Dual-Output Regulator (500 mA Buck Regulator and 300 mA Low-Dropout Regulator (LDO)) • Total Device Quiescent Current = 57 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) • 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 500 mA synchronous buck regulator and 300 mA 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 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. 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 1 2 6 8 7 9 10 5 4 3 SHDN2 VIN2 VOUT2 AGND PGND LX VIN1 SHDN1 VFB1/VOUT1 NC 10-Lead MSOP 1 2 6 8 7 9 10 5 4 3 SHDN2 VIN2 VOUT2 AGND PGND LX VIN1 SHDN1 VFB1/VOUT1 NC 500 mA Synchronous Buck Regulator, + 300 mA LDO |
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