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Microchip Technology MCP1642B-18I/MS
- Part No.:
- MCP1642B-18I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642B-18I/MS.pdf
- Description:
- IC REG BOOST 1.8V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1642B-18I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It delivers 1.8V fixed output from inputs as low as 0.65V start-up voltage and 0.35V operating voltage, supports up to 1.8A peak switch current, operates at 1 MHz PWM frequency, and features true output disconnect in shutdown - enabling PIC® MCU power, USB backup chargers, and wireless sensors.
For engineers reviewing the MCP1642B-18I/MS datasheet, MCP1642B-18I/MS pinout, MCP1642B-18I/MS application, or MCP1642B-18I/MS equivalent, key selection criteria include its 0.65V start-up capability, 1.8V fixed output with ±3% accuracy, 1 µA shutdown current, MSOP-8 package with exposed thermal pad, and true load disconnect functionality - critical for battery life extension in portable medical and handheld instrumentation.
Technical Context
The MCP1642B-18I/MS implements a fixed-frequency (1 MHz) peak-current-mode PWM controller with integrated N-channel boost switch (RDS(ON) = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3 Ω), enabling high efficiency across wide input ranges. Its low-noise anti-ringing control suppresses switch-node oscillations during discontinuous conduction mode.
Startup relies on internal bias derived first from VIN, then transitioning to VOUT once regulation is achieved - allowing operation down to 0.35V input at 1 mA load. The true output disconnect architecture disables both switches and removes the DC path between VIN and VOUT during shutdown, limiting leakage to <1 µA without discharging the output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - internally trimmed; no external feedback resistors required. |
| Start-Up Voltage | 0.65V typical at 1 mA load - enables operation from deeply discharged alkaline or Li-ion cells. |
| Operating Input Range | 0.35V to ≤VOUT (i.e., ≤1.8V) - supports single-cell battery operation down to end-of-life voltage. |
| Switching Frequency | 1.0 MHz ±15% - enables compact 4.7 µH inductor and low-profile 4.7–10 µF ceramic capacitors. |
| Peak Switch Current | 1.8A typical - determines maximum deliverable output current (e.g., >175 mA @ 1.2VIN/1.8VOUT). |
| Shutdown Current | 1 µA max - ensures negligible battery drain during system sleep or standby modes. |
| Power Good Output | Open-drain PG with 90% VOUT threshold and 3% hysteresis - provides reliable MCU reset or sequencing signal. |
| Thermal Protection | 150°C trip with 35°C hysteresis - prevents damage under sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm) with exposed thermal pad (EP); RoHS-compliant, lead-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | Logic-high (>75% VIN) enables regulation; logic-low (<20% VIN) activates true output disconnect; must not float. |
| 2 NC | No connect | Unbonded pin; left unconnected per datasheet - no internal connection or function. |
| 3 PG | Power Good open-drain 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 N- and P-channel MOSFETs meet here. |
| 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 reference circuitry; connects externally to PGND for noise isolation. |
| 8 VIN | Input supply | Accepts 0.35–1.8V input; requires ≥4.7 µF local ceramic bypass capacitor to PGND. |
| 9 EP | Exposed thermal pad | Electrically isolated copper pad; must be soldered to PCB thermal plane for θJA = 211°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | EN = low fully isolates VOUT from VIN via dual-switch cutoff - preserves output capacitor charge and eliminates reverse leakage. |
| Ultra-low start-up voltage | 0.65V typical enables regulation from single NiMH or alkaline cell at end-of-discharge - no external bias needed. |
| 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 required for stable loop response. |
| Anti-ringing switch control | Dampens LC ringing at SW node during DCM - lowers radiated EMI and simplifies EMC filtering requirements. |
| Soft-start with ramped current limit | 550 µs soft-start time with gradual 0 → 1.8A peak current ramp - prevents inrush-induced input droop or output overshoot. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Continuous glucose monitor powered by single AAA alkaline cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 1.8V regulator supplying analog front-end and low-power microcontroller during active and sleep cycles. Use Value: 0.65V start-up and 1 µA shutdown current extend usable battery life beyond 18 months; true disconnect prevents output discharge during storage. |
Use Scenario: Battery-backed PIC16F15323-based environmental sensor node operating in 10-second wake/sleep cycles. IC Role / Device Role / Timing Role: Fixed 1.8V rail generator enabling core logic and ADC operation while minimizing quiescent draw. Use Value: Internal 1.8V trim eliminates external resistor tolerance errors; 1 MHz switching allows use of tiny 0603 inductors and 0402 capacitors. |
| USB Emergency Backup Charger | Wireless Sensor Node |
Use Scenario: Hand-cranked or solar-charged AA-battery pack powering USB 5V output via secondary boost stage. IC Role / Device Role / Timing Role: First-stage 1.8V regulator feeding a second-stage 5V boost IC; enables efficient multi-stage conversion from sub-1V sources. Use Value: 0.35V operating input supports energy harvesting from weak sources; 96% peak efficiency minimizes thermal rise in sealed enclosure. |
Use Scenario: LoRaWAN soil moisture sensor deployed in remote fields, powered by two AA cells for 5+ years. IC Role / Device Role / Timing Role: Primary 1.8V supply for RF transceiver and ultra-low-power MCU during brief transmission bursts. Use Value: 1.8A peak switch current supports 150 mA burst loads; PG output signals MCU when VOUT falls below 1.62V - triggering battery replacement alert. |
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, 1.8V fixed output, 1.2A switch, no true disconnect, 5-pin SOT-23 | Lacks output isolation in shutdown; higher quiescent current (1.2 µA vs. 1 µA); smaller package but lower current capability | Choose for space-constrained designs where true disconnect is unnecessary and peak load ≤1.2A. |
| MCP1642D-18I/MS | Same specs except input-to-output bypass (not disconnect) in shutdown; VFB pin unused; identical pinout | Provides VIN-to-VOUT pass-through during shutdown - suitable when load can tolerate unregulated input voltage | Choose when system requires battery voltage forwarding to load during sleep (e.g., RTC backup), not isolation. |
Compared with TPS61200DRCT, MCP1642B-18I/MS offers superior battery longevity via true disconnect and lower start-up voltage; compared with MCP1642D-18I/MS, it uniquely prevents backfeed and preserves VOUT holdup - essential for systems requiring clean power sequencing.
Availability
MCP1642B-18I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power supplies, USB emergency backup chargers, wireless sensor nodes, and handheld instrumentation requiring stable component supply across long-lifecycle industrial programs.
Supply support for MCP1642B-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 Inc. is a leading provider of microcontrollers, analog devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered portable electronics - emphasizing minimal start-up voltage, integrated synchronous rectification, and configurable shutdown behavior.
FAQ
What is the minimum input voltage required for MCP1642B-18I/MS to start regulating 1.8V output?
The MCP1642B-18I/MS has a typical start-up voltage of 0.65V into a 1 mA resistive load for 1.8V output. This enables operation from nearly depleted alkaline or NiMH cells. Once started, it continues regulation down to 0.35V input at light load - verified per DS20005253A-page 3, Table 1-1.
Does MCP1642B-18I/MS require external feedback resistors to set its 1.8V output?
No. The MCP1642B-18I/MS uses an internal trimmed feedback divider to achieve its fixed 1.8V output - pin 2 (VFB) is unconnected (NC). This eliminates resistor tolerance errors and saves board space, unlike the adjustable ADJ variant which requires external RTOP/RBOT.
How does the true output disconnect feature of MCP1642B-18I/MS improve system reliability?
When EN is pulled low, MCP1642B-18I/MS turns off both internal MOSFETs, eliminating the DC path between VIN and VOUT. This prevents reverse current flow, avoids output capacitor discharge, and maintains VOUT holdup - critical for systems needing clean power-down sequencing or long-term storage without battery drain.
What is the purpose of the exposed thermal pad (EP) on the MCP1642B-18I/MS MSOP package?
The exposed thermal pad (pin 9) on MCP1642B-18I/MS is electrically isolated but thermally conductive. It must be soldered to a PCB copper pour to achieve the specified θJA = 211°C/W. Failure to connect EP degrades thermal performance and risks thermal shutdown under sustained load.
Can MCP1642B-18I/MS drive a 200 mA load from a 1.0V input source?
Yes - characterization data (DS20005253A-page 8, Figure 2-7) shows MCP1642B-18I/MS delivers >200 mA at 1.8V output with VIN ≥ 1.0V. At 1.0V input, output current capability is limited by peak switch current (1.8A) and efficiency; full 200 mA is achievable with proper layout and 4.7 µH inductor.
MCP1642B-18I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
MCP1642B-18I/MS FAQ
1.How can I place an order for MCP1642B-18I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-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 MCP1642B-18I/MS reliable?
The price and inventory of MCP1642B-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 MCP1642B-18I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642B-18I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-18I/MS transactions.
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4.How is shipping managed for MCP1642B-18I/MS?
MCP1642B-18I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-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 MCP1642B-18I/MS?
For technical support, including MCP1642B-18I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-18I/MS requirements.
6.How does Aetrix verify that MCP1642B-18I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642B-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 MCP1642B-18I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642B-18I/MS?
All MCP1642B-18I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-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 MCP1642B-18I/MS part is unused and in its original packaging.
Return procedure for MCP1642B-18I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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