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Microchip Technology MCP1642BT-18I/MS
- Part No.:
- MCP1642BT-18I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642BT-18I/MS.pdf
- Description:
- IC REG BOOST 1.8V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,291
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Product details
Overview
MCP1642BT-18I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery-powered systems, delivering fixed 1.8V output with up to 96% efficiency, 1 MHz PWM switching, and 0.65V minimum start-up voltage. It integrates N-Channel and P-Channel MOSFETs, internal compensation, and true output disconnect during shutdown - enabling reliable power for PIC® MCU supply rails in low-voltage portable instruments.
For engineers reviewing the MCP1642BT-18I/MS datasheet, MCP1642BT-18I/MS pinout, MCP1642BT-18I/MS application, or MCP1642BT-18I/MS equivalent, key selection criteria include its 0.35V operating input voltage capability, 1.8A peak switch current limit, Power Good open-drain indicator, and MSOP-8 package compatibility with space-constrained handheld medical and sensor designs.
Technical Context
The MCP1642BT-18I/MS implements fixed-frequency (1 MHz) peak-current-mode PWM control with adaptive slope compensation and lossless current sensing. Its integrated synchronous rectifier eliminates external diode losses, while internal bias switching enables operation independent of VIN once started.
True output disconnect mode isolates VOUT from VIN during shutdown (EN = GND), reducing input leakage to <1 µA and preventing battery drain - critical for long-life alkaline/NiMH-powered devices. The device lacks undervoltage lockout, allowing operation down to 0.35V input at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - internally trimmed; no external feedback resistors required. |
| Switching Frequency | 1.0 MHz ±15% - enables compact 4.7 µH inductor and low-ESR ceramic capacitors. |
| Peak Switch Current Limit | 1.8A typical - supports >175 mA output at 1.2V input, 1.8V output per characterization. |
| Start-Up Input Voltage | 0.65V typical @ 1 mA load - enables boost from deeply discharged single-cell alkaline or NiMH. |
| Operating Input Voltage | 0.35V typical after start-up - sustains regulation under ultra-low battery voltage conditions. |
| Shutdown Current | 1 µA max - ensures minimal battery drain during system sleep or standby modes. |
| Power Good Threshold | 90% of nominal VOUT (1.62V) with 3% hysteresis - provides clean MCU reset or enable signaling. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), with exposed thermal pad not electrically connected - requires PCB connection to SGND/PGND plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; threshold = 75% of VIN - prevents false turn-on during brown-out. |
| 2 NC | No connect | Unbonded; must remain floating - no external connection permitted. |
| 3 PG | Open-drain Power Good | Sinks current when VOUT drops below 1.62V; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Connects to output capacitor and load; carries full output current and high-frequency ripple. |
| 5 SW | Switch node | High-current path between inductor and internal MOSFETs; peak current up to 1.8A. |
| 6 PGND | Power ground return | Low-impedance return for N-Channel switch; must be tied externally to SGND near IC. |
| 7 SGND | Signal ground reference | Reference for error amplifier and feedback circuitry; connects externally to PGND at single point. |
| 8 VIN | Input supply | Accepts 0.35–5.5V; requires ≥4.7 µF local ceramic bypass capacitor to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | EN = GND removes DC path between VIN and VOUT - preserves battery charge and prevents backfeed. |
| Low-noise anti-ringing control | Damps switch-node oscillations in discontinuous conduction mode - reduces EMI without snubbers. |
| Internal synchronous rectification | Eliminates external Schottky diode - improves efficiency by ~5–10% vs. asynchronous designs. |
| Integrated soft-start | 550 µs ramp time - prevents inrush current and output overshoot during enable transitions. |
| Overtemperature protection | 150°C shutdown with 35°C hysteresis - protects against thermal runaway during overload or poor heatsinking. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered glucose meter or pulse oximeter operating from single AA/AAA alkaline cell. IC Role / Device Role: Primary 1.8V regulator powering low-power analog front-end and microcontroller core. Use Value: 0.65V start-up enables operation until battery reaches 0.35V, extending usable runtime by >20% vs. competing boosters. |
Use Scenario: PIC16F/LF series MCU requiring stable 1.8V I/O and core voltage from 1.2–1.6V single-cell input. IC Role / Device Role: Dedicated step-up supply with Power Good signaling for safe MCU boot and brown-out detection. Use Value: True output disconnect prevents VDD leakage through MCU I/O pins during deep sleep, cutting system quiescent current to sub-µA levels. |
| Wireless Sensor Nodes | Hand-Held Test Instruments |
Use Scenario: LoRaWAN or BLE sensor node powered by coin-cell or alkaline battery with intermittent transmit bursts. IC Role / Device Role: High-efficiency 1.8V rail generator supporting RF transceiver and ADC during active periods. Use Value: 96% peak efficiency at 10–100 mA loads minimizes battery depletion during RF transmission events. |
Use Scenario: Portable multimeter or oscilloscope probe powered by two AA cells (2.4–3.2V) needing precise 1.8V reference rail. IC Role / Device Role: Low-noise, tightly regulated auxiliary supply for precision analog circuitry and display drivers. Use Value: 1.8V ±3% accuracy and <0.1% load regulation ensure stable reference for 12-bit ADC measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | 0.3V start-up, 3.3V fixed output only, no true disconnect - uses external diode in bypass mode. | Requires redesign for 1.8V output; lacks output isolation in shutdown - unsuitable for zero-leakage battery systems. | Select only if 3.3V output suffices and board layout allows external diode placement. |
| MAX17222ELT+T | 1.8V fixed output, 0.4V start-up, 1.2 MHz switching - includes integrated inductor option but no Power Good pin. | Missing PG signal complicates MCU sequencing; integrated inductor limits flexibility in noise-sensitive analog designs. | Prefer when board area is critical and Power Good functionality is not required. |
Compared with TPS61200DRCT and MAX17222ELT+T, the MCP1642BT-18I/MS uniquely combines fixed 1.8V output, true output disconnect, Power Good signaling, and MSOP-8 footprint - making it optimal for battery-critical, MCU-centric portable instrumentation where reliability and low-quiescent design are mandatory.
Availability
MCP1642BT-18I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power rails, wireless sensor nodes, and hand-held test instruments requiring stable component supply across extended production lifecycles.
Supply support for MCP1642BT-18I/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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and power management ICs for embedded control applications.
The MCP1642B/D family was designed specifically for ultra-low-voltage battery-powered systems - emphasizing start-up from depleted cells, high light-load efficiency, and robust shutdown behavior in portable and medical electronics.
FAQ
What is the minimum input voltage required for the MCP1642BT-18I/MS to start regulating 1.8V output?
The MCP1642BT-18I/MS starts regulation at 0.65V typical (up to 0.8V max) with a 1 mA resistive load, as specified in the Electrical Characteristics table. This ultra-low start-up voltage enables operation from nearly exhausted single-cell alkaline or NiMH batteries, and is validated across temperature for the -40°C to +85°C industrial grade rating.
Does the MCP1642BT-18I/MS require external feedback resistors to set its 1.8V output?
No - the MCP1642BT-18I/MS is a fixed-output variant with an internal resistor divider trimmed to deliver 1.8V ±3%. Pin 2 (VFB) is unconnected (NC), eliminating external components and associated leakage or tolerance errors. This simplifies layout and improves light-load efficiency compared to adjustable versions.
How does the true output disconnect feature function in the MCP1642BT-18I/MS during shutdown?
When EN is pulled low, the MCP1642BT-18I/MS turns off both internal MOSFETs and breaks the DC path between VIN and VOUT. This isolates the output capacitor and load from the battery, limiting input current to <1 µA and preventing discharge of VOUT - a critical capability for long-term storage or sleep-mode operation in battery-powered devices.
Can the MCP1642BT-18I/MS operate with input voltages higher than 1.8V?
Yes - the MCP1642BT-18I/MS accepts input voltages from 0.35V up to 5.5V, but regulation is only maintained when VIN < VOUT (i.e., VIN < 1.8V). At VIN ≥ 1.8V, the device enters pass-through mode with minimal dropout, but output voltage follows VIN minus small conduction losses - not regulated 1.8V.
What thermal considerations apply to the MCP1642BT-18I/MS in MSOP-8 package?
The MCP1642BT-18I/MS in MSOP-8 has a junction-to-ambient thermal resistance (θJA) of 211°C/W. To maintain safe operation below 125°C junction temperature, average power dissipation should remain ≤300 mW under continuous load. Use of the exposed thermal pad (EP) is not applicable to this MSOP variant - thermal relief relies on copper pour and via stitching to SGND/PGND planes.
MCP1642BT-18I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.65V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP1642BT-18I/MS FAQ
1.How can I place an order for MCP1642BT-18I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-18I/MS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP1642BT-18I/MS reliable?
The price and inventory of MCP1642BT-18I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1642BT-18I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642BT-18I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-18I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-18I/MS?
MCP1642BT-18I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-18I/MS order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP1642BT-18I/MS?
For technical support, including MCP1642BT-18I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-18I/MS requirements.
6.How does Aetrix verify that MCP1642BT-18I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-18I/MS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP1642BT-18I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642BT-18I/MS?
All MCP1642BT-18I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-18I/MS, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP1642BT-18I/MS part is unused and in its original packaging.
Return procedure for MCP1642BT-18I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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