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Microchip Technology MCP1642D-33I/MC
- Part No.:
- MCP1642D-33I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642D-33I/MC.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1642D-33I/MC from Microchip Technology is a synchronous step-up DC-DC converter with fixed 3.3V output, 1 MHz switching frequency, 0.65V typical start-up voltage, 1.8A peak switch current limit, and input-to-output bypass shutdown mode. It delivers up to 800 mA at 3.3V output from 3.3V input and supports single-cell Li-Ion or alkaline battery-powered portable instrumentation.
For engineers reviewing the MCP1642D-33I/MC datasheet, MCP1642D-33I/MC pinout, MCP1642D-33I/MC application, or MCP1642D-33I/MC equivalent, key selection criteria include low-voltage start-up capability, true input-to-output bypass during shutdown, ±3% output voltage accuracy over –40°C to +85°C, integrated synchronous rectification, and compatibility with compact 8-lead 2x3 DFN packaging.
Technical Context
The MCP1642D-33I/MC implements fixed-frequency (1 MHz) peak-current-mode PWM control with adaptive slope compensation and internal soft-start. Its architecture integrates an 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 without external compensation.
In shutdown, the device enables input-to-output bypass via the internal P-channel MOSFET while drawing ≤1 µA quiescent current. Power Good (PG) provides open-drain status indication at 90% VOUT regulation with 3% hysteresis, supporting MCU interface for system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over –40°C to +85°C; no external resistor divider required. |
| Switching Frequency | 1.0 MHz typical (0.85–1.15 MHz); enables small external inductor (4.7 µH) and capacitor (4.7–10 µF). |
| Start-Up Voltage | 0.65V typical at 1 mA load; supports operation from deeply discharged single-cell batteries. |
| Peak Switch Current Limit | 1.8A typical; determines maximum deliverable output current (e.g., >800 mA @ 3.3VIN/3.3VOUT). |
| Shutdown Mode | Input-to-output bypass (MCP1642D variant); maintains conductive path between VIN and VOUT while consuming ≤1 µA. |
| Power Good Threshold | 90% of nominal VOUT with 3% hysteresis; provides reliable MCU-readable power-status signal. |
| Operating Temperature | –40°C to +85°C ambient; junction temperature protected to +150°C with 35°C hysteresis. |
Pinout & Package
Package: 8-lead 2x3 mm DFN with exposed thermal pad (EP). Pin 9 (EP) must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; requires >75% VIN to activate; <20% VIN to enter bypass shutdown. |
| 2 NC | No connect | Unbonded; must remain unconnected per datasheet - not tied to GND or other signals. |
| 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 load; also serves as reference point for internal feedback network. |
| 5 SW | Switch node | High-current node connecting inductor to internal N- and P-channel switches; peak current up to 1.8A. |
| 6 PGND | Power ground | Return path for high-current N-channel switch; must be connected externally to SGND and EP. |
| 7 SGND | Signal ground | Reference for error amplifier and VFB comparator; electrically separate but externally tied to PGND. |
| 8 VIN | Input supply | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic decoupling capacitor to PGND. |
| 9 EP | Exposed thermal pad | Thermal and EMI path only; no internal electrical connection; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage start-up | 0.65V typical start-up enables use with near-dead alkaline or Li-Ion cells without external bias circuitry. |
| Input-to-output bypass shutdown | EN = low connects VIN directly to VOUT via internal P-MOSFET, preserving load power while drawing ≤1 µA. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ~5–8% vs. asynchronous designs. |
| Anti-ringing switch control | Dampens high-frequency oscillations at SW node in discontinuous conduction mode, lowering radiated EMI. |
| Internal compensation | Full Type II compensation network embedded; removes need for external RC components and simplifies layout. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered glucose meter or pulse oximeter operating from single AA/AAA alkaline cell. IC Role / Device Role / Timing Role: Primary 3.3V rail generator stepping up 0.9–1.6V battery voltage to stable 3.3V for analog front-end and microcontroller. Use Value: Enables continuous operation down to 0.35V input, extending usable battery life by >20% versus higher-VIN(min) alternatives. |
Use Scenario: Low-power PIC MCU in sleep mode requiring regulated 3.3V from partially discharged Li-Ion cell. IC Role / Device Role / Timing Role: System power manager providing both active boost conversion and seamless VIN-to-VOUT bypass during MCU deep-sleep. Use Value: Eliminates need for external bypass FET or LDO; reduces BOM count by one component while maintaining <1 µA system standby current. |
| Wireless Sensor Nodes | Hand-Held Test Instruments |
Use Scenario: Zigbee or BLE sensor node powered by two alkaline cells with intermittent RF transmission bursts. IC Role / Device Role / Timing Role: High-efficiency 3.3V supply delivering >600 mA peak during RF transmit, with fast transient response (<400 µs settling). Use Value: Achieves >92% efficiency at 100 mA load from 2.4V input, minimizing thermal rise in sealed enclosures. |
Use Scenario: Portable multimeter or oscilloscope probe powered by three AAA cells with LCD and ADC subsystems. IC Role / Device Role / Timing Role: Main 3.3V rail source supporting mixed-signal loads including precision references and touch controller. Use Value: Tight ±3% output tolerance and <0.1% load regulation ensure stable ADC reference and display contrast across battery discharge curve. |
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 TPS610995YFFR | Fixed 3.3V output, 1.2 MHz, 0.7V start-up, 1.2A switch current limit, no bypass shutdown mode. | Lacks input-to-output bypass; requires external circuitry for VIN-to-VOUT pass-through during shutdown. | Preferred where higher switching frequency and smaller inductors are prioritized over bypass functionality. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2–5.5V), 1.2 MHz, 0.6V start-up, 1.5A switch current, no integrated bypass mode. | Requires external resistor divider and lacks dedicated bypass path; unsuitable for zero-quiescent-load keep-alive scenarios. | Selected when output voltage flexibility and higher light-load efficiency (pulse-skipping) outweigh bypass requirement. |
Compared with TPS610995YFFR and ADP5070ACPZ-R7, the MCP1642D-33I/MC uniquely delivers verified input-to-output bypass during shutdown with ≤1 µA consumption - a critical advantage for always-on sensor nodes and MCU sleep-state retention where external FETs add cost and board area.
Availability
MCP1642D-33I/MC is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power systems, wireless sensor nodes, and hand-held test instruments requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1642D-33I/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, and consumer markets with vertically integrated silicon and development tools.
The MCP1642B/D product line was designed specifically for ultra-low-voltage battery-powered applications - delivering high efficiency across wide input ranges while enabling unique shutdown modes like true disconnect (B) and input-to-output bypass (D).
FAQ
What is the minimum input voltage required for the MCP1642D-33I/MC to start regulating 3.3V output?
The MCP1642D-33I/MC has a typical start-up voltage of 0.65V at 1 mA resistive load for 3.3V output. It can begin switching and regulate once VIN reaches this threshold, making it suitable for deeply discharged single-cell alkaline or lithium batteries. Post-start-up, it sustains regulation down to 0.35V typical under light load conditions.
How does the input-to-output bypass mode function in the MCP1642D-33I/MC during shutdown?
When EN is pulled low, the MCP1642D-33I/MC activates its internal P-channel MOSFET to create a low-resistance path from VIN to VOUT, enabling direct conduction without switching. This mode draws ≤1 µA total input current and maintains VOUT ≈ VIN, supporting MCU sleep-state retention without external components.
Does the MCP1642D-33I/MC require external compensation components?
No. The MCP1642D-33I/MC integrates full Type II compensation, including error amplifier, poles/zeros, and adaptive slope compensation. No external capacitors or resistors are needed - simplifying design, reducing footprint, and eliminating tuning effort compared to controllers requiring external loop compensation.
What is the purpose of the NC pin (Pin 2) on the MCP1642D-33I/MC DFN package?
Pin 2 on the MCP1642D-33I/MC is explicitly designated "NC" (Not Connected) in the datasheet. It is unbonded and must remain unconnected - neither tied to GND nor left floating. Connecting it risks unintended internal node coupling or latch-up due to lack of internal termination.
Can the MCP1642D-33I/MC drive a 500 mA load at 3.3V output from a 2.4V input?
Yes. According to the datasheet's characterization data, the MCP1642D-33I/MC delivers >600 mA at 3.3V output from 2.4V input. This exceeds the 500 mA requirement while maintaining >90% typical efficiency, confirmed by Figure 2-5 (Efficiency vs. IOUT) under those exact conditions.
MCP1642D-33I/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):
- 3.3V
- 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-33I/MC FAQ
1.How can I place an order for MCP1642D-33I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-33I/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-33I/MC reliable?
The price and inventory of MCP1642D-33I/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-33I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642D-33I/MC?
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4.How is shipping managed for MCP1642D-33I/MC?
MCP1642D-33I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-33I/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-33I/MC?
For technical support, including MCP1642D-33I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-33I/MC requirements.
6.How does Aetrix verify that MCP1642D-33I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642D-33I/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-33I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642D-33I/MC?
All MCP1642D-33I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-33I/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-33I/MC part is unused and in its original packaging.
Return procedure for MCP1642D-33I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642D-33I/MC Tags
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