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Microchip MCP1642 | Demoboard MCP1642B-50I/MS
MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide
Overview
| Topology | Other Topology |
| IC revision | A |
Description
The MCP1642B/D are compact, high-efficiency, fixed-frequency, step-up DC-DC converters. These products provide an easy-to-use power supply solution, with a minimum number of external components for applications powered by one-cell, two-cell, orthree-cell alkaline, Ni-Cd, Ni-MH, one-cell Li-Ion or Li-Polymer batteries.The MCP1642B/D devices operate in Pulse-Width Modulation (PWM), at a fixed 1 MHz switching frequency, featuring Internal Compensation, Overtemperature Protectionand Power Good Open-Drain Output. The device has 1.8V start-up voltage at 5V output and 1 mA load current.There are two shutdown options for the MCP1642B/D family:• True Output Disconnect mode (MCP1642B/D)• Input-to-Output Bypass mode (MCP1642D)For the fixed-output voltage option of the MCP1642B/D devices, the VFB pin is not connected. The output voltage is set by an internal feedback divider. The fixed valuesare: 1.8V, 3.0V, 3.3V, 5.0V (see Table 1-1).On the MCP1642B/D Two-Cells to USB Power Evaluation Board, the fixed output voltage version (MCP1642B/D-50) is used.The goal of the MCP1642B/D Two-Cells to USB Power Evaluation Board is to demonstrate the higher output current capabilities of the MCP1642B/D, supplied fromtwo AA batteries.
Features
- It can be powered by two AA batteries or external power supply
- Input voltage range (VIN): 1.8V to 5.5V, with VIN VOUT
- Minimum start-up voltage: 1.8V at VOUT = 5.0V and IOUT = 1 mA, resistive load
- Output voltage: 5.0V
- Output current: typical 700 mA @ 5V output, 2.8V input
- PWM operation
- PWM switching frequency: 1 MHz
- Power Good indicator 2 mA LED
- Enable state selectable using EN switch
- Peak input current limit of 1.8A
- Overtemperature protection (if the die temperature exceeds +150°C, with 35°Chysteresis)
- USB A output connector
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | Interface Type | Type | Gender | Pins | Mount | IR(mA) | Working Voltage(V (AC)) | Packaging | Poles | L(mm) | Vaporphase process | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 625 nm, Red | Downloads26 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]625 nm | Emitting ColorRed | Peak Wavelength [typ.]630 nm | Luminous Intensity [typ.]250 mcd | Forward Voltage [typ.]2 V | Chip TechnologyAlInGaP | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | – | MountSMT | – | – | PackagingTape and Reel | – | Length1.6 mm | – | |||
 | WS-DISV Small Compact SMT with Raised Actuator 2.54 mm, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWS-DISV Small Compact SMT with Raised Actuator 2.54 mm | – | – | – | – | – | – | – | – | – | – | – | – | Rated Current25 mA | – | PackagingTape and Reel | Poles1 | Length3.48 mm | Vaporphase processnot specified | |||
 | WR-USB Standard Connectors, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Standard Connectors | – | – | – | – | – | – | – | Interface TypeType A | TypeHorizontal | GenderReceptacle | Pins4 | MountSMT | Rated Current1500 mA | Working Voltage30 V (AC) | PackagingTray | – | – | – |