TC1301A/B Dual LDO with Microcontroller RESET Function Features Description Dual Output LDO with Microcontroller Reset The TC1301A/B combines two Low Dropout (LDO) Monitor Functionality: regulators and a microcontroller RESET function into a single 8-pin MSOP or DFN package. Both regulator -V = 1.5V to 3.3V 300 mA OUT1 outputs feature low dropout voltage, 104mV -V = 1.5V to 3.3V 150 mA OUT2 , 150 mV 150 mA for V , 300 mA for V OUT1 OUT2 = 2.20V to 3.20V -V RESET low quiescent current consumption, 58 A each and a Output Voltage and RESET Threshold Voltage typical regulation accuracy of 0.5%. Several fixed- Options Available (See Table 8-1) output voltage and detector voltage combinations are Low Dropout Voltage: available. A reference bypass pin is available to further -V = 104 mV 300 mA (typical) reduce output noise and improve the power supply OUT1 rejection ratio of both LDOs. = 150 mV 150 mA, (typical) -V OUT2 The TC1301A/B is stable over all line and load Low Supply Current: 116 A (typical), conditions with a minimum of 1 F of ceramic output TC1301A/B with both output voltages available capacitance, and utilizes a unique compensation Reference Bypass Input for Low-Noise Operation scheme to provide fast dynamic response to sudden Both Output Voltages Stable with a Minimum of line voltage and load current changes. 1 F Ceramic Output Capacitor For the TC1301A, the microcontroller RESET function Separate Input for RESET Detect Voltage operates independently of both V and V . The OUT1 OUT2 (TC1301A) input to the RESET function is connected to the V DET Separate V and V SHDN pins OUT1 OUT2 pin.The SHDN2 pin is used to control the output of (TC1301B) V only. V will power-up and down with V . OUT2 OUT1 IN RESET Output Duration: 300 ms (typical) In the case of the TC1301B, the detect voltage input of Power-Saving Shutdown Mode of Operation function is connected internally to V . the RESET OUT1 Wake-up from SHDN: 5.3 s (typical) Both V and V have independent shutdown OUT1 OUT2 Small 8-pin DFN and MSOP Package Options capability. Operating Junction Temperature Range: Additional features include an overcurrent limit and - -40C to +125C overtemperature protection that, when combined, Overtemperature and Overcurrent Protection provide a robust design for all load fault conditions. Applications Package Types Cellular/GSM/PHS Phones 8-Pin DFN/MSOP Battery-Operated Systems TC1301A Hand-Held Medical Instruments DFN8 MSOP8 Portable Computers/PDAs V RESET 1 8 RESET 1 8 V DET DET Linear Post-Regulators for SMPS V V V 2 7 V 2 7 IN OUT1 IN OUT1 Pagers GND 3 6 V GND 3 6 V OUT2 OUT2 Related Literature Bypass 45 SHDN2 Bypass 5 4 SHDN2 AN765, Using Microchips Micropower LDOs, DS00765, Microchip Technology Inc., 2002 TC1301B MSOP8 DFN8 AN766, Pin-Compatible CMOS Upgrades to RESET 1 8 SHDN1 BiPolar LDOs, DS00766, Microchip Technology RESET 1 8 SHDN1 Inc., 2002 V V 2 7 V V 2 7 OUT1 IN OUT1 IN AN792, A Method to Determine How Much V V GND 3 6 GND 3 6 OUT2 OUT2 Power a SOT23 Can Dissipate in an Application, Bypass45 SHDN2 Bypass 4 5 SHDN2 DS00792, Microchip Technology Inc., 2001 2008 Microchip Technology Inc. DS21798C-page 1TC1301A/B Functional Block Diagrams TC1301B TC1301A V V V V OUT1 OUT1 IN IN LDO 1 LDO 1 SHDN1 300 mA 300 mA V V OUT2 OUT2 LDO 2 LDO 2 150 mA 150 mA SHDN2 SHDN2 GND GND Bandgap Bandgap Reference Reference Bypass Bypass 1.2V 1.2V V DET RESET RESET Threshold Time Delay V DET Threshold Time Delay Detector 300 ms typ Detector 300 ms, typ Typical Application Circuits TC1301A 8 1 V System RESET RESET DET 2.8V 300 mA 2 7 BATTERY V V OUT1 IN C OUT1 C IN 3 6 2.6V 150 mA 1 F Ceramic V GND 1F OUT2 X5R C 4 5 OUT2 Bypass SHDN2 2.7V 1 F Ceramic to (Note) C BYPASS X5R 4.2V 10 nF Ceramic ON/OFF Control V OUT2 ON/OFF Control V OUT1 TC1301B 8 1 System RESET RESET SHDN1 2 7 2.8V 300 mA BATTERY V V OUT1 IN C OUT1 C IN 3 6 2.6V 150 mA 1 F Ceramic V GND OUT2 1F X5R 4 5 C OUT2 Bypass SHDN2 2.7V 1 F Ceramic to X5R 4.2V ON/OFF Control V Note: C is optional OUT2 BYPASS DS21798C-page 2 2008 Microchip Technology Inc. V OUT1