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Microchip Technology MCP1642B-18I/MC
- Part No.:
- MCP1642B-18I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642B-18I/MC.pdf
- Description:
- IC REG BOOST 1.8V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1642B-18I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery-powered systems, delivering 1.8V fixed output with up to 96% efficiency, 1 MHz PWM switching, and true output disconnect during shutdown. It starts reliably from 0.65V input (at 3.3V VOUT), operates down to 0.35V input (at 1 mA load), and supports >800 mA output at 3.3V VIN → 5.0V VOUT - used in PIC® MCU power rails and portable medical sensors.
For engineers reviewing the MCP1642B-18I/MC datasheet, MCP1642B-18I/MC pinout, MCP1642B-18I/MC application, or MCP1642B-18I/MC equivalent, key selection criteria include low-voltage start-up capability, integrated synchronous rectification, 1 µA shutdown current, Power Good signaling, and true load disconnect functionality - all critical for battery longevity and system-level power sequencing in ultra-low-power embedded designs.
Technical Context
The MCP1642B-18I/MC implements peak-current-mode PWM control with adaptive slope compensation, fixed 1 MHz switching frequency, and internal N-Channel (0.15 Ω RDS(ON)) and P-Channel (0.3 Ω RDS(ON)) synchronous switches. Its low-noise anti-ringing control suppresses switch-node oscillations in discontinuous conduction mode.
Startup uses open-loop charge-pump-assisted pre-charge of VOUT via the P-Channel switch until regulation begins, followed by closed-loop PWM operation. The device lacks undervoltage lockout and operates continuously from 0.35V to ≤5.5V input, with thermal shutdown at 150°C and 35°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - internally trimmed; no external feedback resistors required. |
| Input Voltage Range | 0.35V to ≤5.5V - enables operation from deeply discharged alkaline/Li-ion cells without UVLO interruption. |
| Switching Frequency | 1.0 MHz ±15% - enables compact 4.7 µH inductor and low-profile 4.7–10 µF ceramic capacitors. |
| Peak Switch Current Limit | 1.8A typical - sets maximum deliverable output current based on boost ratio and efficiency. |
| Shutdown Current | 1 µA max - ensures negligible battery drain during system sleep with true output disconnect active. |
| Power Good Threshold | 90% of nominal VOUT (1.62V) with 3% hysteresis - provides reliable MCU reset or enable sequencing signal. |
| Operating Temperature | −40°C to +85°C ambient - qualified for industrial and portable medical environments. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), 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 | Enable logic input | Active-high enable; threshold = 75% of VIN - allows direct connection to MCU GPIO without level-shifting. |
| 2 - NC | No connect | Unbonded pin; must remain unconnected per datasheet - no routing or copper fill allowed. |
| 3 - PG | Open-drain Power Good | Sinks ≥5 mA when VOUT < 90% of regulation; 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 dv/dt node connecting inductor to internal N- and P-channel switches; requires tight layout and minimal trace area. |
| 6 - PGND | Power ground return | Low-impedance return path for 1.8A peak switch current - must be tied directly to SGND externally. |
| 7 - SGND | Signal ground reference | Reference for error amplifier and feedback circuitry - connects to PGND at single point near IC. |
| 8 - VIN | Input supply | Accepts 0.35–5.5V; requires ≥4.7 µF local ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | EN = low disables both switches and breaks DC path from VIN to VOUT - prevents battery discharge into load capacitance. |
| Low-Voltage Start-Up | Starts from 0.65V input (3.3V VOUT, 1 mA load) - enables use with single NiMH or partially depleted Li-ion cells. |
| Internal Synchronous Rectification | Integrated 0.3 Ω P-Channel rectifier eliminates external Schottky diode - reduces BOM count and improves light-load efficiency. |
| Anti-Ringing Switch Control | Damps LC ringing at SW node during DCM - lowers radiated EMI and eliminates need for snubber networks. |
| Thermal Shutdown with Hysteresis | Shuts down at 150°C junction; auto-restarts at 115°C - protects against sustained overload without manual reset. |
Applications
| PIC® MCU Power Supply | Wireless Sensor Node |
|---|---|
Use Scenario: Powering 3.3V or 5.0V PIC microcontrollers from single-cell 1.2–1.6V alkaline batteries in handheld instruments. IC Role / Device Role / Timing Role: Primary regulated DC-DC source providing stable VDD rail with Power Good signaling for safe MCU boot and brown-out detection. Use Value: Enables full MCU operation across full battery discharge curve (0.9–1.6V), extending usable runtime by >30% vs. linear regulators. |
Use Scenario: Supplying 1.8V logic and RF transceiver bias in battery-operated BLE/Zigbee sensor nodes with multi-year lifetime targets. IC Role / Device Role / Timing Role: Ultra-low-quiescent boost regulator delivering regulated 1.8V during periodic wake-up bursts while drawing only 1 µA in shutdown. Use Value: Achieves sub-µA system standby current by combining true output disconnect with internal soft-start and zero-bias leakage paths. |
| Portable Medical Monitor | USB Emergency Backup Charger |
Use Scenario: Generating 1.8V for analog front-end (AFE) and ADC reference in handheld pulse oximeters powered by coin cells. IC Role / Device Role / Timing Role: Precision voltage source with ±3% output accuracy and low noise - critical for 12-bit+ biomedical signal integrity. Use Value: Maintains regulation down to 0.35V input at 1 mA, allowing full utilization of CR2032 capacity (2.0–3.0V range) without premature cutoff. |
Use Scenario: Converting 1.5V AA/AAA battery output to 5.0V USB VBUS for emergency smartphone charging in field kits. IC Role / Device Role / Timing Role: High-efficiency (up to 96%) boost stage enabling >800 mA output at 3.3V input - maximizes energy transfer from primary cells. Use Value: Delivers >1.5W output using standard 4.7 µH inductor and 10 µF ceramics - eliminates need for custom magnetics or large electrolytics. |
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 TPS61200DRCT | Fixed 1.8V output; 0.3V min start-up; 1.2A peak switch; no true disconnect - uses diode-based bypass in shutdown. | Lacks true output disconnect; higher 2.5 µA shutdown current; lower 0.3V start-up suits ultra-low-VIN but sacrifices load isolation. | Select when lowest possible start-up voltage is prioritized over battery isolation during deep sleep. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2–5.5V); 2.5A switch; 1.2 MHz; includes LDO post-regulator; 2.5 µA shutdown. | Higher cost and complexity; dual-output architecture unnecessary for single-rail 1.8V systems; no true disconnect. | Select only if adjustable output or tighter output tolerance (<±1%) is required - otherwise over-specified for this use case. |
Compared with TPS61200DRCT and ADP5070ACPZ-R7, the MCP1642B-18I/MC uniquely combines true output disconnect, 1 µA shutdown, and 0.65V start-up in a compact MSOP package - making it optimal for battery-critical applications where load isolation and extended cell discharge are mandatory.
Availability
MCP1642B-18I/MC is available at Aetrix Electronics and suitable for PIC® MCU power supplies, wireless sensor nodes, portable medical monitors, and USB emergency backup chargers requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for MCP1642B-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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, interface, and power management ICs for embedded control applications.
The MCP1642B-18I/MC belongs to Microchip's low-voltage synchronous boost regulator product line, designed specifically for single-cell battery systems where start-up voltage, shutdown isolation, and efficiency across wide load ranges are critical.
FAQ
What is the minimum input voltage required for MCP1642B-18I/MC to start regulating 1.8V output?
The MCP1642B-18I/MC starts regulating 1.8V output from as low as 0.65V input under 1 mA load conditions, per DS20005253A-page 3. This is achieved via open-loop pre-charge of VOUT through the internal P-Channel switch before closed-loop PWM operation begins. For reliable startup across temperature, design margin should assume ≤0.8V minimum VIN.
Does MCP1642B-18I/MC require external feedback resistors to set its 1.8V output?
No. The MCP1642B-18I/MC uses an internal precision feedback divider to generate its fixed 1.8V output - pin 2 (VFB) is unconnected (NC) and must remain floating. External resistors are only required for the adjustable (ADJ) variant; adding them to MCP1642B-18I/MC would disrupt regulation and is prohibited.
How does the true output disconnect feature function in MCP1642B-18I/MC during shutdown?
When EN is pulled low, the MCP1642B-18I/MC turns off both the N-Channel boost switch and P-Channel synchronous rectifier, eliminating the DC path between VIN and VOUT. This isolates the load from the battery, preventing reverse current and preserving output capacitor charge - confirmed by ≤1 µA shutdown current and zero VOUT discharge in test conditions.
Can MCP1642B-18I/MC operate with input voltages higher than its 1.8V output?
Yes - the MCP1642B-18I/MC supports input voltages up to 5.5V, but regulation is only maintained when VIN ≤ VOUT. If VIN exceeds 1.8V, the device enters pass-through mode with the P-Channel switch conducting, resulting in VOUT ≈ VIN − VDS(ON). This behavior is inherent to its architecture and documented in Section 4.2.5 of the datasheet.
What package type is used for MCP1642B-18I/MC, and is thermal pad connection required?
The MCP1642B-18I/MC uses the 8-Lead MSOP package (3.0 mm × 3.0 mm) with an exposed thermal pad (EP). Although EP has no internal electrical connection, it must be soldered to a PCB copper pour tied to PGND/SGND to achieve the specified θJA = 211°C/W and prevent thermal shutdown under sustained 800 mA loads.
MCP1642B-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:
- 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-DFN (2x3)
MCP1642B-18I/MC FAQ
1.How can I place an order for MCP1642B-18I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-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 MCP1642B-18I/MC reliable?
The price and inventory of MCP1642B-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 MCP1642B-18I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642B-18I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-18I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642B-18I/MC?
MCP1642B-18I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-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 MCP1642B-18I/MC?
For technical support, including MCP1642B-18I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-18I/MC requirements.
6.How does Aetrix verify that MCP1642B-18I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642B-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 MCP1642B-18I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642B-18I/MC?
All MCP1642B-18I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-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 MCP1642B-18I/MC part is unused and in its original packaging.
Return procedure for MCP1642B-18I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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