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Microchip Technology MCP1642D-18I/MC
- Part No.:
- MCP1642D-18I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642D-18I/MC.pdf
- Description:
- IC REG BOOST ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,210
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Product details
Overview
MCP1642D-18I/MC from Microchip Technology is a synchronous step-up DC-DC converter with fixed 1.8V output, designed for ultra-low-voltage battery-powered systems. It starts up from 0.65V input (typical), delivers >175 mA at 1.2VIN/1.8VOUT, operates at 1 MHz PWM frequency, and features input-to-output bypass shutdown mode. It serves as primary power supply for single-cell alkaline/Li-ion sensors and low-power MCUs.
For engineers reviewing the MCP1642D-18I/MC datasheet, MCP1642D-18I/MC pinout, MCP1642D-18I/MC application, or MCP1642D-18I/MC equivalent, key selection criteria include start-up voltage (0.65V), shutdown behavior (input-to-output bypass), output accuracy (±3%), thermal protection (150°C), and package compatibility (8-lead MSOP).
Technical Context
The MCP1642D-18I/MC implements peak-current-mode PWM control with adaptive slope compensation, enabling stable operation across wide VIN–VOUT ratios. Its integrated N-channel boost switch (RDS(ON) = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3 Ω) operate in fixed 1 MHz switching frequency with anti-ringing control to suppress high-frequency noise.
In shutdown, the device enables input-to-output bypass via the internal P-channel MOSFET while drawing <1 µA quiescent current. Start-up uses open-loop charging of VOUT to VIN before transitioning to closed-loop regulation, with soft-start time of 550 µs and no undervoltage lockout-allowing operation down to 0.35V input at light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - internally trimmed; no external resistor divider required. |
| Start-Up Voltage | 0.65V typical @ 1 mA load - enables operation from deeply discharged single-cell batteries. |
| Switching Frequency | 1.0 MHz ±15% - fixed-frequency PWM ensures predictable EMI profile and small external components. |
| Peak Switch Current Limit | 1.8A typical - sets maximum inductor current; determines max output current under given VIN/VOUT ratio. |
| Shutdown Current | 1 µA max - supports long-term battery standby in IoT sensor nodes. |
| Power Good Threshold | 90% of nominal VOUT (1.62V) with 3% hysteresis - provides reliable MCU reset or sequencing signal. |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and portable medical applications. |
Pinout & Package
Package: 8-lead MSOP (3.0 mm × 3.0 mm × 1.0 mm), RoHS-compliant, with exposed thermal pad (EP) not electrically connected - must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Logic-level enable input | Active-high; enables regulator when >75% of VIN; disables with input-to-output bypass when <20% of VIN. |
| 2 NC | No-connect terminal | Not internally bonded; must remain unconnected on PCB. |
| 3 PG | Open-drain Power Good output | Sinks current when VOUT drops below 90% of 1.8V; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Connects to output capacitor and load; also ties internal feedback divider for fixed 1.8V option. |
| 5 SW | Switch node | Connects boost inductor; carries up to 1.8A peak current; internal connection point of N- and P-channel switches. |
| 6 PGND | Power ground return | Low-impedance return path for high-current N-channel switch; must be tied externally to SGND. |
| 7 SGND | Signal ground reference | Return for error amplifier and bias circuitry; connects externally to PGND for single-point grounding. |
| 8 VIN | Input supply voltage | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic decoupling capacitor to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| Input-to-output bypass shutdown | EN = low connects VIN directly to VOUT via internal P-MOSFET, enabling sleep-mode operation without disconnecting load. |
| Ultra-low start-up voltage | 0.65V typical start-up enables use with single Alkaline/Li-ion cells down to end-of-life voltage. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ~5–8% vs. asynchronous designs. |
| Internal compensation | Full Type-II compensation network embedded - no external capacitors or resistors needed for stability. |
| Anti-ringing switch control | Damps LC ringing at SW node during DCM, reducing radiated EMI and eliminating need for snubbers. |
Applications
| Wireless Sensor Node | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE or Sub-GHz RF. IC Role / Device Role / Timing Role: Primary 1.8V rail generator from single 1.5V alkaline cell; powers RF transceiver and microcontroller core. Use Value: Enables operation down to 0.65V input, extending usable battery life by >30% compared to higher-VIN(min) boosters. |
Use Scenario: PIC16F/LF series MCU requiring stable 1.8V supply from single Li-ion cell (2.8–4.2V range). IC Role / Device Role / Timing Role: Regulated 1.8V VDD source; interfaces PG pin to MCU's INT pin for power-good monitoring. Use Value: Input-to-output bypass mode maintains MCU retention voltage during deep-sleep, minimizing wake-up latency and leakage. |
| Portable Medical Glucometer | USB Emergency Backup Charger |
Use Scenario: Handheld blood glucose meter using AAA alkaline battery pack. IC Role / Device Role / Timing Role: Supplies 1.8V to LCD controller and analog front-end; handles rapid load transients during measurement bursts. Use Value: 550 µs soft-start prevents output overshoot during power-on, protecting sensitive analog circuitry. |
Use Scenario: Portable power bank that boosts single-cell battery to 5V USB output only when enabled. IC Role / Device Role / Timing Role: Intermediate 1.8V rail for system management IC; enables/disables main 5V boost stage via EN control. Use Value: <1 µA shutdown current preserves battery charge during storage; bypass mode allows direct battery-to-load path when VIN > VLOAD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61291DRVR | Fixed 1.8V output; 0.7V min start-up; 1.2 MHz switching; no PG output; 6-pin WSON. | Lacks Power Good indicator and input-to-output bypass; better for space-constrained designs where PG is unnecessary. | Select when board area is critical and system does not require power sequencing or bypass functionality. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2–5.5V); 0.8V min start-up; 1.2 MHz; includes LDO post-regulator; 16-pin LFCSP. | Higher integration (LDO + boost), but larger footprint and higher BOM cost; no bypass shutdown mode. | Choose when dual-rail generation (e.g., 1.8V + 3.3V) or tighter output ripple is required, and layout space permits. |
Compared with TPS61291DRVR and ADP5070ACPZ-R7, the MCP1642D-18I/MC uniquely combines ultra-low 0.65V start-up, integrated input-to-output bypass, and dedicated Power Good signaling in an 8-pin MSOP-making it optimal for battery-critical, MCU-coordinated portable systems.
Availability
MCP1642D-18I/MC is available at Aetrix Electronics and suitable for wireless sensors, portable medical devices, and PIC® MCU power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MCP1642D-18I/MC 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, FPGA, and power management semiconductors, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was engineered specifically for ultra-low-voltage, high-efficiency boost conversion in single-cell battery applications-emphasizing minimal start-up voltage, integrated bypass/shutdown modes, and robust operation across industrial temperature ranges.
FAQ
What is the minimum input voltage required for MCP1642D-18I/MC to start up and regulate 1.8V output?
The MCP1642D-18I/MC has a typical start-up voltage of 0.65V at 1 mA load for 1.8V output, with a maximum of 0.8V under worst-case conditions. This enables reliable operation from nearly depleted single-cell alkaline or lithium batteries. Once started, it continues regulating down to 0.35V input at light load, per the datasheet's DC characteristics table.
How does the input-to-output bypass mode work in MCP1642D-18I/MC during shutdown?
When EN is pulled low (<20% of VIN), the MCP1642D-18I/MC activates its internal P-channel MOSFET to connect VIN directly to VOUT, providing a low-resistance path (RDS(ON) ≈ 0.3 Ω). This bypass mode draws <1 µA total current and sustains load voltage without regulation-ideal for MCU sleep states where VIN exceeds the required VOUT.
Does MCP1642D-18I/MC require external compensation components?
No. The MCP1642D-18I/MC integrates full Type-II compensation, including error amplifier, compensation capacitors, and adaptive slope compensation circuitry. No external RC networks are needed-reducing BOM count, PCB area, and design validation effort while ensuring stability across all operating conditions.
What is the function of the PG (Power Good) pin on MCP1642D-18I/MC, and how should it be interfaced?
The PG pin on MCP1642D-18I/MC is an open-drain output that pulls low when VOUT falls below 90% of 1.8V (i.e., 1.62V), with 3% hysteresis. It must be pulled up externally-typically to VOUT or a system rail-with a 10–100 kΩ resistor. It sinks up to 5 mA and is commonly used to trigger MCU reset or enable downstream circuitry only when regulated voltage is present.
Can MCP1642D-18I/MC be used with input voltages higher than 1.8V, such as a 3.0V Li-ion cell?
Yes. The MCP1642D-18I/MC supports input voltages up to 5.5V, and its input-to-output bypass mode is especially beneficial with 3.0–4.2V Li-ion cells: when EN is low, VIN passes directly to VOUT, avoiding unnecessary conversion loss. When EN is high, it regulates precisely to 1.8V-even with high VIN-enabling flexible dual-mode operation in battery-powered systems.
MCP1642D-18I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- 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-DFN (2x3)
MCP1642D-18I/MC FAQ
1.How can I place an order for MCP1642D-18I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-18I/MC 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 MCP1642D-18I/MC reliable?
The price and inventory of MCP1642D-18I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1642D-18I/MC is usually 5 days.
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MCP1642D-18I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-18I/MC 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 MCP1642D-18I/MC?
For technical support, including MCP1642D-18I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-18I/MC requirements.
6.How does Aetrix verify that MCP1642D-18I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642D-18I/MC 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 MCP1642D-18I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642D-18I/MC?
All MCP1642D-18I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-18I/MC, 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 MCP1642D-18I/MC part is unused and in its original packaging.
Return procedure for MCP1642D-18I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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