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Microchip Technology MCP1642D-50I/MC
- Part No.:
- MCP1642D-50I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642D-50I/MC.pdf
- Description:
- IC REG BOOST 5V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
MCP1642D-50I/MC from Microchip Technology is a synchronous step-up DC-DC converter with fixed 5.0V output, designed for single-cell Li-Ion, alkaline, or NiMH battery-powered systems. It delivers up to 1 A output current at VIN > 3.6V, operates down to 0.5V input after startup, and features 1 MHz PWM switching, internal synchronous rectification, and an open-drain Power Good output.
For engineers reviewing the MCP1642D-50I/MC datasheet, MCP1642D-50I/MC pinout, MCP1642D-50I/MC application, or MCP1642D-50I/MC equivalent, this device is selected for ultra-low-voltage boost conversion in space-constrained portable electronics requiring stable 5V rail generation from sub-1V battery sources and true input-to-output bypass during shutdown.
Technical Context
The MCP1642D-50I/MC implements fixed-frequency peak-current-mode PWM control with adaptive slope compensation and integrated N-Channel (0.15 Ω RDS(ON)) and P-Channel (0.3 Ω RDS(ON)) switches. Its low-noise anti-ringing control suppresses switch-node oscillations in discontinuous conduction mode.
In Input-to-Output Bypass mode (EN = low), the internal P-Channel MOSFET connects VIN directly to VOUT, enabling load operation without regulation while drawing <1 µA quiescent current. Startup occurs at 0.9 V (typ.) into a 1 mA resistive load at 5.0 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3%, regulated over input range and load; no external feedback resistors required. |
| Input Voltage Range | 0.5 V (min post-startup) to ≤VOUT (i.e., ≤5.0 V); supports deeply discharged single-cell batteries. |
| Switching Frequency | 1.0 MHz (±15%), enabling compact 4.7 µH inductor and low-profile 4.7–10 µF ceramic capacitors. |
| Peak Switch Current Limit | 1.8 A typical, supporting ≥1 A output at VIN > 3.6 V and VOUT = 5.0 V per characterization data. |
| Shutdown Current | 1 µA maximum in all shutdown states, critical for battery runtime extension in standby. |
| Power Good Threshold | 90% of nominal VOUT (i.e., 4.5 V), with 3% hysteresis and 600 µs delay-enables reliable MCU power sequencing. |
| Operating Temperature | -40°C to +85°C ambient, with thermal shutdown at +150°C junction and 35°C hysteresis. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch) with exposed thermal pad (EP) 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 is 75% of VIN-supports direct MCU I/O drive without level shifters. |
| 2 NC | No-connect terminal | Unbonded pin; must remain floating-no external connection or PCB trace required. |
| 3 PG | Open-drain Power Good output | Sinks current when VOUT falls below 4.5 V; requires external pull-up to VOUT or system rail for MCU interrupt signaling. |
| 4 VOUT | Regulated output node | Connects to output capacitor and load; carries full output current and high di/dt switching transients. |
| 5 SW | Switch node | High-current path between inductor and internal N-/P-MOSFETs; peak current up to 1.8 A; requires tight layout to minimize EMI. |
| 6 PGND | Power ground return | Low-impedance return for N-Channel switch; must be tied externally to SGND near device to avoid ground bounce. |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator; connects externally to PGND at single point under device. |
| 8 VIN | Input supply | Accepts 0.5–5.0 V; requires ≥4.7 µF local ceramic decoupling capacitor placed adjacent to pin. |
| 9 EP | Exposed thermal pad | Thermal interface only-must be soldered to large copper pour tied to SGND/PGND for θJA = 211°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Input-to-Output Bypass Mode | EN = low connects VIN directly to VOUT via internal P-MOSFET, enabling load operation without regulation and <1 µA quiescent draw. |
| Ultra-Low Startup Voltage | 0.9 V typical for 5.0 V output into 1 mA load-enables use of exhausted alkaline or Li-Ion cells down to 0.8 V. |
| 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 stable loop response. |
| Anti-Ringing Switch Control | Damps LC ringing at SW node during DCM, reducing radiated EMI and eliminating need for snubbers or ferrite beads. |
Applications
| USB Emergency Backup Charger | PIC® MCU Power Supply |
|---|---|
Use Scenario: Portable battery pack converting 1S Li-Ion (3.0–4.2 V) to regulated 5.0 V for USB charging of smartphones or accessories. IC Role / Device Role / Timing Role: Primary voltage booster delivering up to 1 A at 5.0 V with input-to-output bypass during low-power idle states. Use Value: Enables direct battery-to-USB conversion without intermediate LDO stages, preserving >92% efficiency across 3.6–4.2 V input range. |
Use Scenario: Powering PIC16/PIC18 microcontrollers from a single 1.5 V alkaline cell in handheld medical sensors or remote controls. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5.0 V rail for MCU core and peripherals, with Power Good signal for safe reset assertion. Use Value: Supports MCU operation down to 0.9 V battery voltage, extending usable battery life by >30% versus higher-VIN(min) alternatives. |
| Wireless Sensor Node | GPS Receiver Power |
Use Scenario: Sub-1 GHz or BLE sensor node powered by two AA alkaline cells (1.8–3.2 V), requiring clean 5.0 V for RF front-end and ADC. IC Role / Device Role / Timing Role: High-efficiency boost converter with low-noise PWM and anti-ringing control to minimize RF interference. Use Value: Delivers 5.0 V at >85% efficiency across 2.0–3.2 V input, with <10 mVPP output ripple-preserving RF sensitivity and ADC accuracy. |
Use Scenario: GPS module in asset tracker operating from single 3.7 V Li-Po cell, needing precise 5.0 V for GNSS receiver IC and active antenna. IC Role / Device Role / Timing Role: Regulated 5.0 V source with fast transient response and Power Good monitoring for cold-start reliability. Use Value: Maintains regulation during GPS acquisition surges (up to 500 mA peak), with <600 µs PG assertion delay ensuring deterministic boot timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61200DRCT | Fixed 5.0 V output; 0.3–5.5 V input; 1.2 MHz switching; no Power Good output; 1.5 A switch current limit. | Lacks PG signal and input-to-output bypass-requires external circuitry for MCU sequencing and low-power pass-through. | Select when PG and bypass are unnecessary and higher peak current (1.5 A) is prioritized over integrated protection features. |
| Analog Devices ADP5070ARMZ-R7 | Adjustable output (1.2–15 V); 2.85–15 V input; 1.2 MHz; includes soft-start and precision enable threshold; no bypass mode. | Requires external resistor divider; wider input range but incompatible with sub-1V startup; no input-to-output pass-through capability. | Select for adjustable output or higher input voltage systems where ultra-low-VIN operation is not required. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1642D-50I/MC uniquely combines sub-1V startup, integrated Power Good, and input-to-output bypass-making it optimal for battery-powered devices demanding both deep discharge support and intelligent low-power state management.
Availability
MCP1642D-50I/MC is available at Aetrix Electronics and suitable for USB backup chargers, PIC® MCU power supplies, wireless sensor nodes, GPS receivers, and handheld medical instruments requiring stable component supply with guaranteed long-term availability.
Supply support for MCP1642D-50I/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 leading provider of microcontroller, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was engineered specifically for ultra-low-input-voltage boost conversion in portable battery-powered equipment-emphasizing startup reliability, efficiency across wide load ranges, and seamless integration with Microchip's PIC® MCU ecosystem.
FAQ
What is the minimum input voltage required for MCP1642D-50I/MC to start up and regulate 5.0 V?
The MCP1642D-50I/MC starts up at 0.9 V typical (max 1.8 V) into a 1 mA resistive load at 5.0 V output, as specified in the Electrical Characteristics table for the -50 variant. This enables operation from deeply discharged single-cell alkaline or Li-Ion batteries that fall below 1.0 V, a key differentiator versus most competing boost regulators.
How does the Input-to-Output Bypass mode function in MCP1642D-50I/MC?
When EN is pulled low, the MCP1642D-50I/MC activates its internal P-Channel MOSFET to connect VIN directly to VOUT, providing unregulated pass-through power while consuming <1 µA. This allows loads like sleeping MCUs to remain powered without boost conversion losses-distinct from the MCP1642B's true disconnect mode.
Does MCP1642D-50I/MC require external compensation components?
No. The MCP1642D-50I/MC integrates full Type-II compensation, including error amplifier, compensation capacitors, and slope compensation circuitry. No external resistors or capacitors are needed on the VFB pin or elsewhere-reducing BOM count and layout complexity while guaranteeing stability across all operating conditions.
What is the purpose of the NC pin (Pin 2) on MCP1642D-50I/MC?
Pin 2 is a no-connect (NC) terminal with no internal bond wire or circuit connection. It must remain unconnected on the PCB-no trace, pad, or solder mask opening is required. Leaving it floating avoids potential noise coupling or unintended parasitic paths that could affect signal integrity on adjacent pins.
Can MCP1642D-50I/MC drive a 500 mA load at 5.0 V from a 3.3 V input?
Yes. Per the datasheet's characterization data (Figure 2-7 and DC Characteristics table), the MCP1642D-50I/MC delivers >800 mA at VIN = 3.3 V and VOUT = 5.0 V. At 500 mA, it operates well within thermal and current limits, achieving >94% typical efficiency with proper layout and 4.7 µH inductor selection.
MCP1642D-50I/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):
- 5V
- 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-50I/MC FAQ
1.How can I place an order for MCP1642D-50I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-50I/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-50I/MC reliable?
The price and inventory of MCP1642D-50I/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-50I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642D-50I/MC?
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4.How is shipping managed for MCP1642D-50I/MC?
MCP1642D-50I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-50I/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-50I/MC?
For technical support, including MCP1642D-50I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-50I/MC requirements.
6.How does Aetrix verify that MCP1642D-50I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642D-50I/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-50I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642D-50I/MC?
All MCP1642D-50I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-50I/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-50I/MC part is unused and in its original packaging.
Return procedure for MCP1642D-50I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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