Microchip Technology MCP1642D-30I/MS

Overview

MCP1642D-30I/MS from Microchip Technology is a synchronous step-up DC-DC converter with fixed 3.0V output, designed for low-voltage battery-powered systems. It delivers up to 300 mA at 1.5V input, starts from 0.9V (typical), operates at 1 MHz PWM, and integrates N-Channel and P-Channel MOSFETs with internal compensation. It is used in single-cell Li-Ion or alkaline-powered PIC® MCU applications requiring stable 3.0V rail generation.

For engineers reviewing the MCP1642D-30I/MS datasheet, MCP1642D-30I/MS pinout, MCP1642D-30I/MS application, or MCP1642D-30I/MS equivalent, key selection criteria include input start-up voltage (0.9V typ), shutdown mode (input-to-output bypass), output accuracy (±3%), thermal protection (150°C), and MSOP-8 package compatibility with space-constrained portable designs.

Technical Context

The MCP1642D-30I/MS implements peak-current-mode PWM control with adaptive slope compensation and an integrated 1.8A N-Channel boost switch plus synchronous P-Channel rectifier. Its 1 MHz fixed-frequency operation enables compact magnetics and low output ripple, while anti-ringing control suppresses high-frequency switch-node oscillations in discontinuous conduction mode.

This device uses true input-to-output bypass during shutdown-connecting VIN directly to VOUT via the internal P-Channel MOSFET-enabling load operation from battery voltage without regulation when EN = GND. Unlike the MCP1642B variant, it does not disconnect the output; instead, it maintains a low-impedance path (<0.3 Ω R_DS(ON)) with <1 µA quiescent current.

Key Specifications

Pinout & Package

Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), with exposed thermal pad (EP) not electrically connected-must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous boost regulator applications.

Compared with MCP1642B-30I/MS, the MCP1642D-30I/MS provides direct input-to-output conduction in shutdown-reducing system-level complexity for always-on loads-while TPS610993DRVR trades bypass capability for lower start-up voltage and higher peak current, demanding redesign of layout and control logic.

Availability

MCP1642D-30I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power supplies, wireless sensor nodes, and USB emergency backup chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MCP1642D-30I/MS includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog, interface, power management, and timing solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software.

The MCP1642B/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and multi-cell battery-powered portable electronics-emphasizing minimal external components, robust start-up, and intelligent shutdown behavior.

FAQ

What is the minimum input voltage required for MCP1642D-30I/MS to start regulating 3.0V output?

The MCP1642D-30I/MS has a typical start-up input voltage of 0.9V for 3.0V output under 1 mA load, as specified in the Electrical Characteristics table. This allows operation from nearly depleted alkaline cells. The device will continue regulating down to 0.35V after start-up, provided source impedance is low. Actual start-up may vary slightly with capacitor ESR and inductor DCR, but 0.9V is the validated typical value for MCP1642D-30I/MS.

How does the input-to-output bypass mode work in MCP1642D-30I/MS during shutdown?

When EN is pulled low, MCP1642D-30I/MS activates its internal P-Channel MOSFET to directly connect VIN to VOUT, creating a low-resistance path (<0.3 Ω) with <1 µA quiescent current. This bypass mode sustains unregulated power to loads that can operate at battery voltage-such as PIC® MCU sleep peripherals-without drawing from the boost circuit. It differs fundamentally from the MCP1642B's true disconnect mode and is intrinsic to the MCP1642D-30I/MS design.

Is an external resistor divider required for MCP1642D-30I/MS to set the output voltage?

No. The MCP1642D-30I/MS features a factory-trimmed internal feedback network configured for fixed 3.0V output. Pin 2 (VFB) is marked NC (not connected) and must remain unconnected on the PCB. External resistors are unnecessary-and would interfere with regulation-because the 3.0V setpoint is achieved entirely through internal precision resistors, delivering ±3% accuracy over temperature and line.

What package type and thermal characteristics apply to MCP1642D-30I/MS?

MCP1642D-30I/MS is supplied in an 8-Lead MSOP package (3.0 mm × 4.9 mm) with an exposed thermal pad (EP). Its junction-to-ambient thermal resistance (θ_JA) is 211°C/W. For reliable operation at full load, the EP must be soldered to a minimum 100 mm² copper pour connected to PGND/SGND. No internal electrical connection exists between EP and pins-PCB layout must tie EP to ground plane solely for thermal conduction.

Does MCP1642D-30I/MS include overtemperature protection, and how does it behave?

Yes. MCP1642D-30I/MS incorporates thermal shutdown that disables switching when junction temperature exceeds 150°C (typical). Upon shutdown, the soft-start capacitor discharges and the device automatically restarts once temperature falls by 35°C (to ~115°C). This hysteresis prevents thermal cycling. Protection is fully internal-no external components or configuration are needed-and applies identically across all MCP1642D-30I/MS units.