MCP1623/24 Low-Voltage Input Boost Regulator for PIC Microcontrollers Features General Description Up to 96% Typical Efficiency The MCP1623/24 is a compact, high-efficiency, fixed-frequency, synchronous step-up DC-DC 425 mA Typical Peak Input Current Limit: converter. It provides an easy-to-use power supply -I >50mA 1.2V V , 3.3V V OUT IN OUT solution for PIC microcontroller applications powered -I > 175 mA 2.4V V , 3.3V V OUT IN OUT by either single-cell, two-cell, or three-cell alkaline, -I > 175 mA 3.3V V 5.0V V OUT IN, OUT NiCd, NiMH, and single-cell Li-Ion or Li-Polymer Low Start-Up Voltage: 0.65V, 3.3V V 1 mA batteries. OUT (typical) Low-voltage technology allows the regulator to start up Low Operating Input Voltage: 0.35V, typical without high inrush current or output voltage overshoot 3.3V 1 mA OUT from a low 0.65V input. High efficiency is accomplished Adjustable Output Voltage Range: 2.0V to 5.5V by integrating the low-resistance N-Channel Boost switch and synchronous P-Channel switch. All Maximum Input Voltage V < 5.5V OUT compensation and protection circuitry are integrated to Automatic PFM/PWM Operation (MCP1624) minimize external components. For standby PWM-Only Operation (MCP1623) applications, the MCP1624 operates and consumes PWM Operation: 500 kHz only 19 A while operating at no load. Low Device Quiescent Current: 19 A, typical A true Load Disconnect mode provides input to output PFM Mode isolation while disabled (EN = GND) by removing the Internal Synchronous Rectifier normal boost regulator diode path from input to output. Internal Compensation This mode consumes less than 1 A of input current. Inrush Current Limiting and Internal Soft Start Output voltage is set by a small external resistor True Load Disconnect divider. Shutdown Current (All States): <1 A Low Noise, Anti-Ringing Control Package Types Overtemperature Protection Available Packages: MCP1623/24 - 6-Lead SOT-23 6-Lead SOT-23 - 8-Lead 2 x 3 DFN V SW 1 6 IN V Applications GND 2 5 OUT One, Two and Three-Cell Alkaline and NiMH/NiCd EN 3 V 4 FB Low-Power PIC Microcontroller Applications MCP1623/24 2x3 DFN* V V 1 8 FB IN S V 2 7 GND EP OUTS 9 P V 3 6 GND OUTP EN 4 5 SW * Includes Exposed Thermal Pad (EP) see Table 3-1. 2010-2016 Microchip Technology Inc. DS40001420D-page 1MCP1623/24 Typical Application L 1 4.7 H V OUT V 3.3V IN SW V 0.9V to 1.7V OUT V IN V 976 k DD C C OUT IN + 10 F 4.7 F EN V FB PIC MCU 562 k V SS GND - FIGURE 1: Typical Application Circuit. 100 V = 2.5V IN 90 80 V = 1.2V IN 70 V = 0.8V IN 60 50 40 30 20 0.01 0.1 1 10 100 1000 I (mA) OUT FIGURE 2: MCP1624 Efficiency vs. I , V =3.3V. OUT OUT DS40001420D-page 2 2010-2016 Microchip Technology Inc. ALKALINE Efficiency (%) MCP1623/24