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Microchip Technology MCP1642BT-33I/MC
- Part No.:
- MCP1642BT-33I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642BT-33I/MC.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1642BT-33I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for low-voltage battery-powered systems. It delivers 3.3V output from inputs as low as 0.65V start-up voltage, supports up to 800 mA output at 3.3V with 3.3V input, and integrates N-Channel and P-Channel MOSFETs with 0.15 Ω and 0.3 Ω typical RDS(ON). It is used in PIC® MCU power supplies and single-cell Li-Ion to 3.3V conversion.
For engineers reviewing the MCP1642BT-33I/MC datasheet, MCP1642BT-33I/MC pinout, MCP1642BT-33I/MC application, or MCP1642BT-33I/MC equivalent, this page provides verified technical context, exact pin functions, confirmed efficiency curves, true output disconnect behavior, and validated alternative options for portable medical devices, wireless sensors, and handheld instrumentation.
Technical Context
The MCP1642BT-33I/MC implements fixed-frequency (1 MHz) peak-current-mode PWM control with adaptive slope compensation and internal soft-start. Its low-noise anti-ringing switch suppresses high-frequency ringing at the SW node during discontinuous conduction mode, reducing radiated EMI without external snubbers.
It features true output disconnect shutdown (MCP1642B variant), where EN = GND fully isolates VOUT from VIN by turning off both integrated switches - eliminating DC leakage paths and preserving output capacitor charge. The 1.21V feedback reference enables precise 3.3V regulation (±3%) across –40°C to +85°C ambient.
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. |
| Start-Up Voltage | 0.65V typical into 1 mA load at 3.3V output - enables operation from deeply discharged alkaline or Li-Ion cells. |
| Peak Switch Current | 1.8A typical - sets maximum deliverable output current (e.g., >800 mA at 3.3VOUT/3.3VIN). |
| Switching Frequency | 1.0 MHz ±15% - enables compact 4.7 µH inductor and <10 µF ceramic output capacitance. |
| Shutdown Current | 1 µA max - ensures negligible battery drain during system sleep in portable applications. |
| Efficiency | Up to 96% typical - achieved via synchronous rectification and low RDS(ON) (0.15 Ω N-MOS, 0.3 Ω P-MOS). |
| Power Good Output | Open-drain PG with 90% threshold and 3% hysteresis - provides reliable MCU-ready signal for sequencing. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), lead-free, RoHS-compliant. Exposed thermal pad not present in MSOP variant (only in 2x3 DFN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; requires >75% of VIN to activate; <20% of VIN to guarantee shutdown. |
| 2 NC | No-connect terminal | Not internally bonded; must be left floating or tied to GND per layout best practice. |
| 3 PG | Open-drain Power Good | Sinks current when VOUT falls below 90% of 3.3V; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Connects to output capacitor and load; carries full output current; internal P-MOS source connection. |
| 5 SW | Switch node | High-current path between inductor and internal N-MOS drain/P-MOS source; peak current up to 1.8A. |
| 6 PGND | Power ground return | Low-impedance return for N-MOS switch current; must be connected to SGND externally on PCB. |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator; connects to PGND at single point near IC. |
| 8 VIN | Input supply | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic bypass capacitor to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | EN = GND removes all DC paths between VIN and VOUT - preserves VOUT charge and eliminates battery drain. |
| Low-noise anti-ringing control | Integrated damping circuit suppresses high-frequency oscillation at SW node - reduces EMI without snubber components. |
| Internal compensation | Full Type-II compensation network embedded - eliminates need for external compensation components. |
| Inrush current limiting | Soft-start limits initial VOUT ramp rate to 550 µs to 90% of 3.3V - prevents input voltage sag and output overshoot. |
| Overtemperature protection | Thermal shutdown at 150°C junction temperature with 35°C hysteresis - enables automatic recovery after cooling. |
Applications
| Portable Medical Sensors | Wireless Sensor Nodes |
|---|---|
Use Scenario: Battery-powered glucose monitor operating from single alkaline cell (0.9–1.6V). IC Role / Device Role / Timing Role: Primary 3.3V power rail generator for analog front-end and BLE radio. Use Value: 0.65V start-up enables full functionality even at end-of-life battery voltage; 1 µA shutdown current extends shelf life. |
Use Scenario: LoRaWAN environmental sensor powered by AA batteries. IC Role / Device Role / Timing Role: Efficient 3.3V supply for microcontroller and RF transceiver during periodic wake-up bursts. Use Value: 96% peak efficiency minimizes average current draw; true disconnect prevents VOUT discharge during deep sleep. |
| PIC® MCU Power Supply | Hand-Held Test Instruments |
Use Scenario: Portable oscilloscope probe powered by one Li-Ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Step-up regulator delivering stable 3.3V to digital core and ADC reference. Use Value: 1.21V precision feedback reference ensures ±3% output accuracy across temperature; PG signal synchronizes MCU boot sequence. |
Use Scenario: Battery-operated multimeter requiring clean 3.3V for display and measurement circuitry. IC Role / Device Role / Timing Role: Low-noise 3.3V source with minimal ripple for high-resolution analog measurements. Use Value: Anti-ringing control reduces high-frequency noise on VOUT - avoids interference with sensitive analog signal paths. |
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 | Fixed 3.3V output; 0.3V min start-up; 1.2A switch current; no true disconnect - only high-Z output in shutdown. | Lacks true output isolation; higher quiescent current (1.2 µA vs. 1 µA); suitable for non-critical hold-up applications. | Select when board space is constrained (2x2 DFN) and output disconnect is not required. |
| MAX17222ATA+T | Adjustable/fixed 3.3V option; 0.4V start-up; 0.8A switch current; integrated soft-start; no PG output. | Lower peak current limits output capability at high VOUT/low VIN; missing PG simplifies interface but removes system monitoring. | Select when cost sensitivity outweighs PG requirement and 800 mA output is not needed. |
Compared with TPS61200DRCT and MAX17222ATA+T, the MCP1642BT-33I/MC uniquely combines true output disconnect, 0.65V start-up, and open-drain PG in an MSOP package - making it optimal for battery-critical portable instruments requiring guaranteed VOUT retention and sequenced startup.
Availability
MCP1642BT-33I/MC is available at Aetrix Electronics and suitable for portable medical sensors, wireless sensor nodes, PIC® MCU power supplies, and hand-held test instruments requiring stable component supply with long-term lifecycle support.
Supply support for MCP1642BT-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, and mixed-signal ICs, with expertise in low-power, battery-optimized power management solutions.
The MCP1642B/D family was designed specifically for ultra-low-input-voltage boost conversion in single- and multi-cell battery systems - targeting portable medical, sensor, and embedded MCU applications demanding high efficiency and minimal quiescent current.
FAQ
What is the minimum input voltage required for the MCP1642BT-33I/MC to start regulating 3.3V output?
The MCP1642BT-33I/MC has a typical start-up voltage of 0.65V into a 1 mA resistive load at 3.3V output. This allows operation from nearly depleted alkaline or lithium primary cells. Once started, it continues regulation down to 0.35V input at light loads, as confirmed in DS20005253A-page 3 DC Characteristics.
Does the MCP1642BT-33I/MC provide true output disconnect during shutdown?
Yes - the 'B' suffix in MCP1642BT-33I/MC denotes the True Output Disconnect variant. When EN is pulled low, both internal N-Channel and P-Channel switches turn off, eliminating all DC paths between VIN and VOUT. This preserves output capacitor charge and draws only 1 µA from the input source.
What is the function of Pin 2 (NC) on the MCP1642BT-33I/MC MSOP package?
Pin 2 is Not Connected (NC) - it is not internally bonded and serves no electrical function. Per Microchip's DS20005253A-page 11, it must be left floating or tied to GND on the PCB to maintain mechanical stability and avoid unintended coupling. It is not used for trimming or configuration.
Can the MCP1642BT-33I/MC drive a 500 mA load at 3.3V output from a 2.4V input?
Yes - according to DS20005253A-page 1, the MCP1642BT-33I/MC delivers >600 mA at 2.4VIN/3.3VOUT. This is enabled by its 1.8A peak switch current limit and low RDS(ON) MOSFETs (0.15 Ω N-MOS, 0.3 Ω P-MOS), ensuring sufficient headroom for sustained 500 mA operation.
How does the Power Good (PG) pin on the MCP1642BT-33I/MC behave during startup and fault conditions?
The PG pin is an open-drain output that remains high-impedance until VOUT reaches 90% of 3.3V (3.0V), then pulls low. It exhibits 3% hysteresis and responds within 250 µs. During undervoltage or overload, PG goes high-impedance again. Its 600 µs delay ensures stable assertion after soft-start completion - critical for MCU reset sequencing in the MCP1642BT-33I/MC.
MCP1642BT-33I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- 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)
MCP1642BT-33I/MC FAQ
1.How can I place an order for MCP1642BT-33I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-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 MCP1642BT-33I/MC reliable?
The price and inventory of MCP1642BT-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 MCP1642BT-33I/MC is usually 5 days.
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MCP1642BT-33I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-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 MCP1642BT-33I/MC?
For technical support, including MCP1642BT-33I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-33I/MC requirements.
6.How does Aetrix verify that MCP1642BT-33I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-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 MCP1642BT-33I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642BT-33I/MC?
All MCP1642BT-33I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-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 MCP1642BT-33I/MC part is unused and in its original packaging.
Return procedure for MCP1642BT-33I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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