TC1313 500 mA Synchronous Buck Regulator, + 300 mA LDO Features Description Dual-Output Regulator (500 mA Buck Regulator The TC1313 combines a 500 mA synchronous buck and 300 mA Low-Dropout Regulator (LDO)) regulator and 300 mA Low-Dropout Regulator (LDO) to provide a highly integrated solution for devices that Total Device Quiescent Current = 57 A (Typ.) require multiple supply voltages. The unique combina- Independent Shutdown for Buck and LDO tion of an integrated buck switching regulator and low- Outputs dropout linear regulator provides the lowest system Both Outputs Internally Compensated cost for dual-output voltage applications that require Synchronous Buck Regulator: one lower processor core voltage and one higher bias - Over 90% Typical Efficiency voltage. - 2.0 MHz Fixed-Frequency PWM The 500 mA synchronous buck regulator switches at a (Heavy Load) fixed frequency of 2.0 MHz when the load is heavy, - Low Output Noise providing a low-noise, small-size solution. When the load on the buck output is reduced to light levels, it - Automatic PWM-to-PFM mode transition changes operation to a Pulse Frequency Modulation - Adjustable (0.8V to 4.5V) and Standard (PFM) mode to minimize quiescent current draw from Fixed-Output Voltages (0.8V, 1.2V, 1.5V, the battery. No intervention is necessary for smooth 1.8V, 2.5V, 3.3V) transition from one mode to another. Low-Dropout Regulator: The LDO provides a 300mA auxiliary output that - Low-Dropout Voltage = 137 mV Typ. requires a single 1F ceramic output capacitor, 200 mA minimizing board area and cost. The typical dropout - Standard Fixed-Output Voltages voltage for the LDO output is 137 mV for a 200 mA (1.5V, 1.8V, 2.5V, 3.3V) load. Small 10-pin 3X3 DFN or MSOP Package The TC1313 is available in either the 10-pin DFN or Options MSOP package. Operating Junction Temperature Range: Additional protection features include: UVLO, - -40C to +125C overtemperature and overcurrent protection on both Undervoltage Lockout (UVLO) outputs. Output Short Circuit Protection For a complete listing of TC1313 standard parts, Overtemperature Protection consult your Microchip representative. Applications Package Type Cellular Phones 10-Lead DFN Portable Computers SHDN2 1 10 P GND USB-Powered Devices V IN2 2 9 L X Handheld Medical Instruments V OUT2 3 8 V IN1 Organizers and PDAs 4 7 NC SHDN1 A 5 6 V /V GND FB1 OUT1 10-Lead MSOP P SHDN2 1 10 GND V 2 9 L IN2 X V V 3 8 OUT2 IN1 NC 4 7 SHDN1 V /V A 5 6 FB1 OUT1 GND 2005 Microchip Technology Inc. DS21974A-page 1TC1313 Functional Block Diagram Undervoltage Lockout UVLO V REF (UVLO) Synchronous Buck Regulator V IN1 PDRV V IN2 L X Driver Control SHDN1 NDRV P GND P GND P GND A V /V GND OUT1 FB1 V REF UVLO V OUT2 LDO SHDN2 A GND DS21974A-page 2 2005 Microchip Technology Inc.