TC1303A/TC1303B/ TC1303C/TC1304 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output Features Description Dual-Output Regulator (500 mA Buck Regulator The TC1303/TC1304 combines a 500mA synchro- and 300 mA Low-Dropout Regulator) nous buck regulator and 300 mA Low-Dropout Regula- tor (LDO) with a power-good monitor to provide a highly Power-Good Output with 300 ms Delay integrated solution for devices that require multiple Total Device Quiescent Current = 65 A, Typ. supply voltages. The unique combination of an Independent Shutdown for Buck and LDO integrated buck switching regulator and low-dropout Outputs (TC1303) linear regulator provides the lowest system cost for Both Outputs Internally Compensated dual-output voltage applications that require one lower Synchronous Buck Regulator: processor core voltage and one higher bias voltage. - Over 90% Typical Efficiency The 500 mA synchronous buck regulator switches at a - 2.0 MHz Fixed-Frequency PWM fixed frequency of 2.0 MHz when the load is heavy, (Heavy Load) providing a low noise, small-size solution. When the load on the buck output is reduced to light levels, it - Low Output Noise changes operation to a Pulse Frequency Modulation - Automatic PWM to PFM mode transition (PFM) mode to minimize quiescent current draw from - Adjustable (0.8V to 4.5V) and Standard the battery. No intervention is necessary for smooth Fixed-Output Voltages (0.8V, 1.2V, 1.5V, transition from one mode to another. 1.8V, 2.5V, 3.3V) The LDO provides a 300mA auxiliary output that Low-Dropout Regulator: requires a single 1F ceramic output capacitor, - Low-Dropout Voltage = 137 mV Typ. minimizing board area and cost. The typical dropout 200 mA voltage for the LDO output is 137 mV for a 200 mA - Standard Fixed-Output Voltages load. (1.5V, 1.8V, 2.5V, 3.3V) For the TC1303/TC1304, the power-good output is Power-Good Function: based on the regulation of the buck regulator output, the - Monitors Buck Output Function (TC1303A) LDO output or the combination of both. The TC1304 - Monitors LDO Output Function (TC1303B) features start-up and shutdown output sequencing. - Monitors Both Buck and LDO Output Func- The TC1303/TC1304 is available in either the 10-pin tions (TC1303C and TC1304) DFN or MSOP package. - 300 ms Delay Used for Processor Reset Additional protection features include: UVLO, Sequenced Startup and Shutdown (TC1304) overtemperature and overcurrent protection on both Small 10-pin 3X3 DFN or MSOP Package outputs. Options For a complete listing of TC1303/TC1304 standard Operating Junction Temperature Range: parts, consult your Microchip representative. - -40C to +125C Undervoltage Lockout (UVLO) Output Short Circuit Protection Overtemperature Protection Applications Cellular Phones Portable Computers USB-Powered Devices Handheld Medical Instruments Organizers and PDAs 2005 Microchip Technology Inc. DS21949B-page 1TC1303A/TC1303B/TC1303C/TC1304 Package Types TC1303A,B,C 10-Lead DFN 10-Lead MSOP P SHDN2 1 10 SHDN2 1 10 P GND GND V V 2 9 L IN2 L IN2 X 2 9 X V V 3 8 IN1 V OUT2 OUT2 3 8 V IN1 4 7 SHDN1 PG 4 7 SHDN1 PG V /V A 5 6 FB1 OUT1 GND A 5 6 V /V GND FB1 OUT1 TC1304 10-Lead DFN 10-Lead MSOP P SHDN 1 10 SHDN 1 10 P GND GND V V 2 9 L IN2 L IN2 X 2 9 X V V 3 8 IN1 V OUT2 OUT2 3 8 V IN1 4 7 A PG GND A 4 7 PG GND V /V A 5 6 FB1 OUT1 GND A 5 6 V /V GND FB1 OUT1 DS21949B-page 2 2005 Microchip Technology Inc.