MCP16251/2 Low Quiescent Current, PFM/PWM Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option Features Applications Up to 96% Typical Efficiency One, Two and Three-Cell Alkaline and NiMH/NiCd Portable Products 650 mA Typical Peak Input Current Limit: Solar Cell Applications -I > 100 mA 3.3V V , 1.2V V OUT OUT IN Personal Care and Medical Products -I > 250 mA 3.3V V , 2.4V V OUT OUT IN Bias for Status LEDs -I > 225 mA 5.0V V , 3.3V V OUT OUT IN Smartphones, MP3 Players, Digital Cameras Low Device Quiescent Current: Remote Controllers, Portable Instruments - Output Quiescent Current: < 4 A typical, device is not switching (V > V , Wireless Sensors OUT IN excluding feedback divider current) Bluetooth Headsets - Input Sleep Current: 1 A +3.3V to +5.0V Distributed Power Supply - No Load Input Current: 14 A typical Shutdown Current: 0.6 A typical General Description Low Start-Up Voltage: 0.82V, 1 mA load The MCP16251/2 is a compact, high-efficiency, fixed Low Operating Input Voltage: down to 0.35V frequency, synchronous step-up DC-DC converter. Adjustable Output Voltage Range: 1.8V to 5.5V This family of devices provides an easy-to-use power supply solution for applications powered by either Maximum Input Voltage V < 5.5V OUT one-cell, two-cell or three-cell alkaline, NiCd, NiMH, Automatic PFM/PWM Operation: one-cell Li-Ion or Li-Polymer batteries. - PWM Operation: 500 kHz Low-voltage technology allows the regulator to start-up - PFM Output Ripple: 150 mV typical without high inrush current or output voltage overshoot Feedback Voltage: 1.23V from a low-voltage input. High efficiency is Internal Synchronous Rectifier accomplished by integrating the low-resistance Internal Compensation N-Channel boost switch and synchronous P-Channel Inrush Current Limiting and Internal Soft Start switch. All compensation and protection circuitry are (1.5 ms typical) integrated to minimize external components. MCP16251/2 operates and consumes less than 14 A Selectable, Logic Controlled, Shutdown States: from battery after start-up, while operating at no load - True Load Disconnect Option (MCP16251) (V = 3.3V, V = 1.5V). The devices provide a true OUT IN - Input-to-Output Bypass Option (MCP16252) disconnect from input to output (MCP16251) or an Anti-Ringing Control input-to-output bypass (MCP16252), while in shutdown Overtemperature Protection (EN = GND). Both shutdown options consume less than 0.6 A from battery. Available Packages: - SOT-23, 6-Lead Output voltage is set by a small external resistor divider. Two package options, SOT-23, 6-lead and - TDFN, 2 x 3 x 0.8 mm, 8-Lead TDFN, 2 x 3 x 0.8 mm, 8-lead are available. Package Types MCP16251/2 MCP16251/2 6-Lead SOT-23 2x3x0.8 TDFN* V V 8 V SW 1 6 1 IN FB IN S 2 7 V V GND EP OUTS GND 2 5 OUT 9 P 3 6 V GND OUTP 3 EN 4 V FB EN 4 5 SW * Includes Exposed Thermal Pad (EP) see Table 3-1. 2013 - 2016 Microchip Technology Inc. DS20005173B-page 1MCP16251/2 Typical Application L 4.7 H V OUT V IN 3.3V / 75 mA SW V 0.9V to 1.7V OUT R TOP V IN 1.69 M C C OUT IN + V 10 F 4.7 F FB EN R BOT 1M GND - L 4.7 H V OUT V IN 5.0V / 200 mA SW V 3.0V to 4.2V OUTS R TOP V IN V OUTP 3.09 M C C OUT IN + V 10 F 4.7 F FB EN R BOT 1M P - S GND GND 100 95 V = 3.0V IN 90 85 V = 2.4V IN V = 1.5V IN 80 75 70 65 60 55 V = 3.3V OUT 50 0.1 1 10 100 1000 I (mA) OUT DS20005173B-page 2 2013 - 2016 Microchip Technology Inc. Efficiency (%) Alkaline Li-Ion