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MCP1642B Datasheet(PDF) 1 Page - Microchip Technology |
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MCP1642B Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 32 page  2014 Microchip Technology Inc. DS20005253A-page 1 MCP1642B/D Features • Up to 96% Typical Efficiency • 1.8A Typical Peak Input Current Limit: -IOUT > 175 mA @ 1.2V VIN, 3.3V VOUT -IOUT > 600 mA @ 2.4V VIN, 3.3V VOUT -IOUT > 800 mA @ 3.3V VIN, 5.0V VOUT -IOUT > 1A @ VIN > 3.6V, 5.0V VOUT • Low Start-Up Voltage: 0.65V, typical 3.3V VOUT @ 1 mA • Low Operating Input Voltage: 0.35V, typical 3.3V VOUT @ 1 mA • Output Voltage Range: - Reference Voltage, VFB =1.21V - 1.8V to 5.5V for the adjustable device option - 1.8V, 3.0V, 3.3V and 5.0V for fixed VOUT options • Maximum Input Voltage V OUT <5.5V • PWM Operation: 1 MHz - Low Noise, Anti-Ringing Control • Power Good Open-Drain Output • Internal Synchronous Rectifier • Internal Compensation • Inrush Current Limiting and Internal Soft-Start • Selectable, Logic-Controlled Shutdown States: - True Load Disconnect Option (MCP1642B) - Input-to-Output Bypass Option (MCP1642D) • Shutdown Current (All States): 1 µA • Overtemperature Protection • Available Packages: - 8-Lead MSOP - 8-Lead 2x3 DFN Applications • One, Two and Three-Cell Alkaline, Lithium Ultimate and NiMH/NiCd Portable Products • Single-Cell Li-Ion to 5V Converters •PIC® MCU Power • USB Emergency Backup Charger from Batteries • Personal Medical Products • Wireless Sensors • Hand-Held Instruments • GPS Receivers • +3.3V to +5.0V Distributed Power Supply General Description The MCP1642B/D devices are compact, high-efficiency, fixed-frequency, synchronous step-up DC-DC converters. This family of devices provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell, or three-cell alkaline, Ultimate Lithium, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries. Low-voltage technology allows the regulator to start-up without high inrush current or output voltage overshoot from a low voltage input. High efficiency is accomplished by integrating the low-resistance N-Channel Boost switch and synchronous P-Channel switch. All compensation and protection circuitry are integrated to minimize the number of external components. An open-drain Power Good output is provided to indicate when the output voltage is within 10% of regulation and facilitates the interface with an MCU. For standby applications, MCP1642B provides a “true output disconnect” from input to output while in shutdown (EN = GND). An additional device option (MCP1642D) is available and connects “input to output bypass” while in shutdown. Both options consume less than 1 µA of input current. For the adjustable (ADJ) device options, the output voltage is set by a small external resistor divider. Fixed VOUT device options do not require external divider resistors. Two package options, 8-lead MSOP and 8- lead 2x3 DFN, are available. Package Types PG NC VOUT SGND PGND 1 2 3 4 8 7 6 5 SW VIN EN EP 9 PGND SGND PG VFB VOUT SGND PGND 1 2 3 4 8 7 6 5 SW VIN EN EP 9 6 1 2 3 8 VIN PGND EN VFB PG 7 SGND 5 4 SW VOUT 6 1 2 3 8 VIN EN NC PG 7 5 4 SW VOUT MCP1642B/D-xx MSOP MCP1642B/D-xx 2x3 DFN* MCP1642B/D-ADJ MSOP MCP1642B/D-ADJ 2x3 DFN* * Includes Exposed Thermal Pad (EP); see Table 3-1. 1.8A Input Current Switch, 1 MHz Low-Voltage Start-Up Synchronous Boost Regulator |
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Similar Description - MCP1642B |
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