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Microchip Technology MCP1642BT-50I/MC
- Part No.:
- MCP1642BT-50I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642BT-50I/MC.pdf
- Description:
- IC REG BOOST 5V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,245
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Product details
Overview
MCP1642BT-50I/MC from Microchip Technology is a synchronous step-up DC-DC converter with true output disconnect shutdown, fixed 5.0V output, 1 MHz PWM switching, 0.65V typical start-up voltage, and 1.8A peak input current limit. It delivers >1A output at VIN > 3.6V into 5.0V, enabling single-cell Li-Ion to 5V conversion for PIC® MCU power and portable medical devices.
For engineers reviewing the MCP1642BT-50I/MC datasheet, MCP1642BT-50I/MC pinout, MCP1642BT-50I/MC application, or MCP1642BT-50I/MC equivalent, key selection criteria include low-voltage start-up capability, integrated synchronous rectification, Power Good open-drain signaling, thermal shutdown at 150°C, and compatibility with 8-lead MSOP packaging.
Technical Context
The MCP1642BT-50I/MC implements fixed-frequency peak-current-mode PWM control with adaptive slope compensation and internal RC oscillator (1.0 MHz typ). Its architecture integrates an N-channel boost switch (RDS(ON)N = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON)P = 0.3 Ω), eliminating external diode losses.
Startup begins at 0.65V input (3.3V VOUT, 1 mA load) using open-loop charge-pump-like pre-charge of VOUT via the P-channel switch, followed by closed-loop regulation. The device supports true output disconnect in shutdown (EN = GND), breaking all DC paths between VIN and VOUT while drawing <1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over -40°C to +85°C ambient; requires no external feedback resistors. |
| Switching Frequency | 1.0 MHz typical (0.85–1.15 MHz range); enables compact 4.7 µH inductor and low-ESR ceramic capacitors. |
| Start-Up Voltage | 0.65V typical at 3.3V VOUT / 1 mA; allows operation from deeply discharged alkaline or NiMH cells. |
| Peak Switch Current Limit | 1.8A typical; sets maximum deliverable output current (e.g., >1A at VIN > 3.6V, 5.0V VOUT). |
| Quiescent Current (Shutdown) | 1 µA max; enables ultra-low-power battery standby in portable sensors and emergency chargers. |
| Power Good Threshold | 90% of nominal VOUT (4.5V); open-drain PG asserts low when output drops below regulation window. |
| Thermal Shutdown | 150°C junction temperature with 35°C hysteresis; protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant, with exposed thermal pad (EP) not electrically connected internally - must be soldered to PCB ground plane for thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; requires >75% of VIN to activate; <20% of VIN to disable; must not float. |
| 2 NC | No connect | Unbonded pin; left unconnected per datasheet; no internal circuitry attached. |
| 3 PG | Open-drain Power Good | Sinks current when VOUT falls below 90% of 5.0V; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | 5.0V output terminal; connects to output capacitor and load; also ties internal feedback divider (fixed option). |
| 5 SW | Switch node | Connects boost inductor; carries up to 1.8A peak current; internal N- and P-channel MOSFET drains/sources meet here. |
| 6 PGND | Power ground return | High-current return path for N-channel switch; must be tied externally to SGND and PCB ground plane. |
| 7 SGND | Signal ground reference | Low-noise return for error amplifier and VFB reference; externally connected to PGND at single point. |
| 8 VIN | Input supply | Accepts 0.35V–5.5V input; requires ≥4.7 µF local ceramic bypass capacitor to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | EN = GND fully isolates VOUT from VIN via P-channel gate control, preventing battery drain and output discharge. |
| Integrated Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by >5% vs. asynchronous designs. |
| Low-Noise Anti-Ringing Control | Damps high-frequency oscillations at SW node during DCM, lowering radiated EMI without snubbers. |
| Internal Compensation | Full Type-II compensation network embedded; no external capacitor/resistor required for stable 5.0V regulation. |
| Inrush Current Limiting & Soft-Start | 550 µs soft-start time prevents output overshoot and limits inrush into large output capacitors during enable. |
Applications
| USB Emergency Backup Charger | PIC® MCU Power Supply |
|---|---|
Use Scenario: Portable battery-powered charger that converts single-cell Li-Ion (3.0–4.2V) to regulated 5.0V USB output for smartphone charging. IC Role / Device Role: Primary 5.0V step-up regulator with true disconnect to preserve battery during idle. Use Value: Delivers >1A at 5.0V from VIN > 3.6V; 1 µA shutdown current extends shelf life; PG signal enables MCU-controlled charge state reporting. |
Use Scenario: Powering 3.3V or 5.0V PIC microcontrollers from one or two alkaline cells (1.2–3.0V) in handheld instruments. IC Role / Device Role: Fixed-output boost converter providing stable MCU core voltage with Power Good monitoring. Use Value: 0.65V start-up enables operation down to near-dead batteries; PG pin interfaces directly with PIC I/O for brown-out detection and sleep/wake coordination. |
| Wireless Sensor Node | Personal Medical Device |
Use Scenario: Low-power BLE sensor node powered by CR2032 coin cell (2.0–3.0V), requiring 3.3V or 5.0V for radio and analog front-end. IC Role / Device Role: Efficient 5.0V generation with minimal quiescent draw and fast wake-up from shutdown. Use Value: 1 µA shutdown current preserves multi-year battery life; 1 MHz switching minimizes inductor size; thermal shutdown prevents overheating in sealed enclosures. |
Use Scenario: Portable glucose meter or pulse oximeter using AAA alkaline cells (1.0–1.5V/cell) to power 5.0V LCD backlight and analog signal chain. IC Role / Device Role: Compact, reliable boost stage delivering precise 5.0V from low-input sources with safety-critical thermal protection. Use Value: 150°C thermal shutdown with 35°C hysteresis ensures fail-safe operation; low start-up voltage maintains functionality even with weak batteries. |
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 | Adjustable output (0.9–5.5V); 1.2A peak switch current; 0.3V min start-up; no true disconnect (bypass only) | Lacks true output disconnect; requires external feedback resistors; better for ultra-low-VIN (<0.5V) but less suitable for battery isolation. | Select TPS61200DRCT only if adjustable output and sub-0.5V start-up are mandatory; verify PG signal compatibility and thermal derating. |
| MAX77801EWL+T | Fixed 5.0V output; 2.0A peak current; 0.5V start-up; integrated LDO backup; no PG pin | Includes LDO fallback but omits Power Good indicator; higher cost; larger 12-bump WLP package. | Choose MAX77801EWL+T when dual-path power redundancy is needed; avoid if PG-driven MCU sequencing is required. |
Compared with MCP1642BT-50I/MC, TPS61200DRCT offers lower start-up voltage but lacks true disconnect, while MAX77801EWL+T adds LDO backup at the expense of missing PG signaling - making MCP1642BT-50I/MC optimal for cost-sensitive, battery-isolated 5.0V systems requiring deterministic shutdown behavior.
Availability
MCP1642BT-50I/MC is available at Aetrix Electronics and suitable for USB emergency backup chargers, PIC® MCU power supplies, wireless sensor nodes, personal medical devices, and handheld instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for MCP1642BT-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 Inc. is a leading provider of microcontrollers, analog, interface, and power management ICs, serving automotive, industrial, and consumer markets with vertically integrated silicon and software solutions.
The MCP1642B/D product line delivers compact, high-efficiency synchronous boost regulators optimized for ultra-low-input-voltage battery-powered applications - specifically targeting single- and multi-cell alkaline, Li-Ion, and NiMH/NiCd portable systems.
FAQ
What is the minimum input voltage required for MCP1642BT-50I/MC to start regulating 5.0V output?
The MCP1642BT-50I/MC has a typical start-up voltage of 0.9V for 5.0V output under 1 mA load, as specified in the Electrical Characteristics table for MCP1642B/D-50. This value is higher than the 0.65V start-up for 3.3V output due to the increased boost ratio. Operation below this threshold may result in unstable or non-regulated output.
Does MCP1642BT-50I/MC support true output disconnect, and how is it activated?
Yes, MCP1642BT-50I/MC supports true output disconnect. When the EN pin is pulled low (<20% of VIN), the internal P-channel MOSFET is fully turned off, removing all DC conduction paths between VIN and VOUT. This feature is inherent to the "B" variant designation and is confirmed in Section 4.1.1 and Table 4-1 of the datasheet.
Can MCP1642BT-50I/MC be used with input voltages above 5.0V?
No. The absolute maximum rating for VIN is +6.5V, but the device specification states "Maximum Input Voltage ≤ VOUT < 5.5V". Since MCP1642BT-50I/MC is a fixed 5.0V output part, VIN must remain ≤ 5.0V. Exceeding this risks loss of regulation and potential damage, as the internal switches are not rated for continuous operation above VOUT.
What is the purpose of the NC pin (Pin 2) on MCP1642BT-50I/MC, and must it be connected?
Pin 2 is designated NC (No Connect) and is internally unconnected - no bond wire or circuitry attaches to it. Per Table 3-1 and Figure on page 11 of DS20005253A, it must remain unconnected on the PCB. Soldering or routing to this pin may cause mechanical stress or unintended coupling and is not recommended.
How does the Power Good (PG) pin of MCP1642BT-50I/MC behave during startup and fault conditions?
The PG pin of MCP1642BT-50I/MC is an open-drain output that remains high-impedance until VOUT reaches 90% of 5.0V (4.5V), then pulls low after a 600 µs delay. It stays low if VOUT drops below 4.5V and releases after VOUT rises above 4.5V + hysteresis (4.65V). PG does not indicate overtemperature or short-circuit faults - only output regulation status.
MCP1642BT-50I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
MCP1642BT-50I/MC FAQ
1.How can I place an order for MCP1642BT-50I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-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 MCP1642BT-50I/MC reliable?
The price and inventory of MCP1642BT-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 MCP1642BT-50I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642BT-50I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-50I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-50I/MC?
MCP1642BT-50I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-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 MCP1642BT-50I/MC?
For technical support, including MCP1642BT-50I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-50I/MC requirements.
6.How does Aetrix verify that MCP1642BT-50I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-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 MCP1642BT-50I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642BT-50I/MC?
All MCP1642BT-50I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-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 MCP1642BT-50I/MC part is unused and in its original packaging.
Return procedure for MCP1642BT-50I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642BT-50I/MC Tags
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