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Microchip Technology MCP1642D-ADJI/MC
- Part No.:
- MCP1642D-ADJI/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642D-ADJI/MC.pdf
- Description:
- IC REG BOOST ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,359
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Product details
Overview
MCP1642D-ADJI/MC from Microchip Technology is a synchronous step-up DC-DC converter with input-to-output bypass shutdown mode, 1.21 V feedback reference, 1 MHz fixed-frequency PWM operation, and adjustable 1.8–5.5 V output voltage. It delivers up to 1 A at 5.0 V from ≥3.6 V input and supports ultra-low-voltage start-up (0.65 V typical) for single-cell battery-powered systems including PIC® MCU power rails and USB backup chargers.
For engineers reviewing the MCP1642D-ADJI/MC datasheet, MCP1642D-ADJI/MC pinout, MCP1642D-ADJI/MC application, or MCP1642D-ADJI/MC equivalent, key selection criteria include its input-to-output bypass functionality during shutdown, 1.8A peak switch current limit, internal synchronous rectification, and compatibility with low-ESR ceramic capacitors and 4.7 µH inductors in space-constrained portable designs.
Technical Context
The MCP1642D-ADJI/MC implements peak-current-mode control with adaptive slope compensation and an integrated 1.8A N-channel boost switch plus P-channel synchronous rectifier. Its 1 MHz oscillator enables compact magnetics and low output ripple, while anti-ringing circuitry suppresses high-frequency switch-node oscillations in discontinuous conduction mode.
Unlike conventional boost converters, it operates down to 0.35 V input after start-up and provides true input-to-output bypass (not disconnect) when EN is low-enabling load retention during sleep without external diodes. Power Good signaling (90% VOUT threshold, 3% hysteresis) interfaces directly with MCU GPIOs for system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.8 V to 5.5 V (adjustable via external resistor divider; VFB = 1.21 V nominal) |
| Switching Frequency | 1.0 MHz ±15% (fixed-frequency PWM; enables small 4.7 µH inductor and low-ripple design) |
| Peak Switch Current Limit | 1.8 A typical (supports ≥800 mA output at 5.0 V from 3.3 V input; limits inrush and short-circuit stress) |
| Start-Up Input Voltage | 0.65 V typical (enables operation from deeply discharged alkaline/Li-ion cells; no external bias required) |
| Shutdown Quiescent Current | 1 µA maximum (EN = GND; maintains ultra-low standby drain in battery-backed systems) |
| Power Good Threshold | 90% of regulated VOUT with 3% hysteresis (open-drain PG pin signals stable regulation to host MCU) |
| Operating Junction Temp. | –40°C to +125°C (supports industrial and medical portable environments; thermal shutdown at 150°C) |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 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 | Logic-controlled enable input | Active-high (VIH > 75% VIN); controls input-to-output bypass mode; must not float |
| 2 - NC | No-connect terminal | Not internally bonded; leave unconnected on PCB |
| 3 - PG | Open-drain Power Good output | Sinks current when VOUT drops below 90% regulation; requires external pull-up to VOUT or system rail |
| 4 - VOUT | Regulated output node | Connects to output capacitor and FB divider top resistor; carries full load current |
| 5 - SW | Switch node | Connects boost inductor; carries peak 1.8 A switching current; high dv/dt node requiring tight layout |
| 6 - PGND | Power ground return | Low-impedance return path for N-channel switch; tie externally to SGND and EP |
| 7 - SGND | Signal ground reference | Return for error amplifier and VFB; connect externally to PGND and EP for noise immunity |
| 8 - VIN | Main input supply | Accepts 0.35–5.5 V; requires ≥4.7 µF local ceramic decoupling capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Input-to-output bypass shutdown | MCP1642D variant connects VIN to VOUT via internal P-MOSFET when disabled-retains load power without external diode |
| Ultra-low start-up voltage | 0.65 V typical enables use with single-cell alkaline, Li-Ion, or NiMH under deep discharge |
| Integrated synchronous rectification | Eliminates external Schottky diode; improves efficiency by ~5–10% vs. asynchronous designs at medium loads |
| Internal compensation | Reduces BOM count: no external compensation network required for stable operation with standard 4.7 µH inductor |
| Anti-ringing switch control | Damps switch-node ringing in DCM, reducing radiated EMI and eliminating need for snubbers |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered glucose monitor with BLE radio and analog front-end requiring stable 3.3 V from single AA cell. IC Role / Device Role / Timing Role: Primary step-up regulator delivering regulated 3.3 V output; enables MCU wake-up from sub-µA sleep using PG signal. Use Value: 0.65 V start-up extends usable battery life by >20% versus higher-VIN alternatives; 1 µA shutdown current preserves battery during 99% idle time. |
Use Scenario: PIC16F178x-based handheld meter powered by two alkaline cells (1.8–3.2 V range), needing clean 5.0 V for ADC reference and display backlight. IC Role / Device Role / Timing Role: Adjustable boost converter configured for 5.0 V output; PG pin synchronizes MCU initialization after power stabilization. Use Value: Internal 1.8A switch handles peak 1A backlight load without external FET; 1 MHz switching minimizes inductor size (<3 mm² footprint). |
| USB Emergency Backup Charger | Wireless Sensor Node |
Use Scenario: Portable power bank using single Li-ion cell (3.0–4.2 V) to deliver 5.0 V/500 mA USB output during grid outage. IC Role / Device Role / Timing Role: High-efficiency boost stage enabling USB PD negotiation; bypass mode maintains VBUS during MCU sleep cycles. Use Value: 96% peak efficiency at 500 mA reduces thermal rise in sealed enclosure; input-to-output bypass avoids voltage drop across external diode. |
Use Scenario: LoRaWAN soil moisture sensor powered by one CR2032 coin cell (2.0–3.0 V), transmitting intermittently at 3.3 V. IC Role / Device Role / Timing Role: Low-quiescent boost regulator supplying 3.3 V to RF transceiver and microcontroller; soft-start prevents brown-out during wake-up. Use Value: 0.35 V operating minimum allows full utilization of CR2032 capacity down to 2.0 V; 1 µA shutdown current enables >5-year battery life. |
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 | 0.3 V start-up; 1.2 A switch; no PG pin; 600 kHz switching | Lacks Power Good signaling and input-to-output bypass; better for ultra-low-VIN only | Choose TPS61200DRCT if start-up below 0.65 V is mandatory and PG is unnecessary |
| Analog Devices ADP5070ACPZ-R7 | 2.5–15 V input; dual output; 1.2 A per channel; 1.2 MHz; external compensation | Higher input range, larger package (16-lead LFCSP); requires external loop compensation | Choose ADP5070ACPZ-R7 for multi-rail systems needing independent 3.3 V/5.0 V outputs |
Compared with TPS61200DRCT and ADP5070ACPZ-R7, the MCP1642D-ADJI/MC uniquely combines input-to-output bypass shutdown, integrated PG signaling, and 1 MHz operation in an 8-pin MSOP-reducing component count and PCB area for single-output, battery-critical portable designs.
Availability
MCP1642D-ADJI/MC is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power rails, USB emergency backup chargers, wireless sensor nodes, and handheld instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MCP1642D-ADJI/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 devices, and power management ICs, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software solutions.
The MCP1642B/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and multi-cell battery-powered portable electronics-emphasizing minimal external components, robust start-up behavior, and seamless integration with Microchip's PIC® MCU ecosystem.
FAQ
What is the function of the NC pin on MCP1642D-ADJI/MC?
Pin 2 on the MCP1642D-ADJI/MC is marked NC (No Connect) and is not internally bonded. It must remain unconnected on the PCB layout. This pin has no electrical function and serves only as a mechanical placeholder in the 8-lead MSOP package. Leaving it floating or connecting it to any net may compromise reliability or violate Microchip's recommended assembly practices for the MCP1642D-ADJI/MC.
Does MCP1642D-ADJI/MC support true output disconnect during shutdown?
No, MCP1642D-ADJI/MC implements input-to-output bypass mode-not true output disconnect. When EN is pulled low, the internal P-channel MOSFET connects VIN directly to VOUT, allowing load power retention. True output disconnect is exclusive to the MCP1642B variant. Using MCP1642D-ADJI/MC in place of MCP1642B-ADJ will maintain VOUT during shutdown but will not isolate the load from the input source.
What is the recommended inductor value for MCP1642D-ADJI/MC in a 3.3 V output design?
The recommended inductor value for MCP1642D-ADJI/MC in a 3.3 V output configuration is 4.7 µH, as validated in Microchip's typical application circuits and efficiency curves. This value balances peak current handling (≤1.8 A), core loss, and physical size. Inductors must support ≥2 A saturation current and use low-DCR wire-wound or shielded construction to maintain stability and efficiency across the full load range of the MCP1642D-ADJI/MC.
Can MCP1642D-ADJI/MC operate with input voltage higher than output voltage?
No-MCP1642D-ADJI/MC is a step-up (boost) converter and cannot regulate when VIN exceeds VOUT. Per Microchip's Electrical Characteristics table, "For VIN > VOUT, VOUT will not remain in regulation." If VIN rises above the programmed VOUT (e.g., due to battery recharge), the output will track VIN minus diode drop through the internal P-MOSFET in bypass mode, but regulation is lost. Designers must ensure input never exceeds target output unless relying solely on bypass functionality.
How is the output voltage set for the adjustable version MCP1642D-ADJI/MC?
For MCP1642D-ADJI/MC, the output voltage is set using an external resistor divider between VOUT and GND, with the midpoint connected to VFB. The formula is VOUT = VFB × (1 + RTOP/RBOT), where VFB = 1.21 V nominal. RTOP and RBOT should be high-value resistors (e.g., 976 kΩ and 309 kΩ for 5.0 V) to minimize quiescent current and preserve light-load efficiency-consistent with Microchip's design guidance for the MCP1642D-ADJI/MC.
MCP1642D-ADJI/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):
- 5.5V
- 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-ADJI/MC FAQ
1.How can I place an order for MCP1642D-ADJI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-ADJI/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-ADJI/MC reliable?
The price and inventory of MCP1642D-ADJI/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-ADJI/MC is usually 5 days.
3.What payment methods are accepted for MCP1642D-ADJI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642D-ADJI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642D-ADJI/MC?
MCP1642D-ADJI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-ADJI/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-ADJI/MC?
For technical support, including MCP1642D-ADJI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-ADJI/MC requirements.
6.How does Aetrix verify that MCP1642D-ADJI/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642D-ADJI/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-ADJI/MC meets industry standards.
7.What is the process for return or replacement of MCP1642D-ADJI/MC?
All MCP1642D-ADJI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-ADJI/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-ADJI/MC part is unused and in its original packaging.
Return procedure for MCP1642D-ADJI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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