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Microchip Technology MCP1642BT-50I/MS
- Part No.:
- MCP1642BT-50I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642BT-50I/MS.pdf
- Description:
- IC REG BOOST 5V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,632
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Product details
Overview
MCP1642BT-50I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery systems, delivering 5.0V output from as low as 0.9V input with up to 96% typical efficiency, 1 MHz fixed-frequency PWM operation, and true output disconnect during shutdown. It integrates N- and P-channel MOSFETs, internal compensation, and a 1.21V feedback reference, enabling compact power solutions in portable medical devices, wireless sensors, and PIC® MCU applications.
For engineers reviewing the MCP1642BT-50I/MS datasheet, MCP1642BT-50I/MS pinout, MCP1642BT-50I/MS application, or MCP1642BT-50I/MS equivalent, key selection criteria include low-voltage start-up (0.65V typ. for 3.3V VOUT), 1.8A peak switch current limit, 1 µA shutdown current, Power Good open-drain output, and MSOP-8 package compatibility with space-constrained designs.
Technical Context
The MCP1642BT-50I/MS implements peak-current-mode PWM control with adaptive slope compensation, operating at a nominal 1 MHz switching frequency with ±15% variation over temperature. Its low-noise anti-ringing circuit suppresses switch-node oscillations in discontinuous conduction mode, reducing radiated EMI without external snubbers.
Startup begins at 0.65V (typ.) into a 1 mA load for 3.3V output - scaled to 0.9V (typ.) for 5.0V output - using an internal ring oscillator before transitioning to the main RC oscillator and closed-loop regulation. The device maintains regulation down to 0.5V input (typ.) at 1 mA load for 5.0V output, enabled by integrated bias sourcing from VOUT after startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3%, internally trimmed - eliminates external resistor divider and associated leakage/contamination risks. |
| Start-Up Voltage | 0.9V typical for 5.0V output at 1 mA - enables operation from deeply discharged alkaline or Li-ion cells. |
| Peak Switch Current | 1.8A typical - supports >1A output at VIN ≥ 3.6V, 5.0V VOUT, defining maximum deliverable power under boost ratio constraints. |
| Switching Frequency | 1.0 MHz ±15% - enables use of small 4.7 µH inductors and <10 µF ceramic output capacitors for minimal board area. |
| Shutdown Current | 1 µA maximum - ensures negligible battery drain during system sleep, critical for multi-year battery life in IoT sensors. |
| Power Good Threshold | 90% of nominal VOUT with 3% hysteresis - provides reliable MCU reset or sequencing signal without external monitoring circuitry. |
| Operating Temperature | –40°C to +85°C ambient - validated for industrial and portable medical environments with no derating required. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), thermally enhanced with exposed pad connected to PGND on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Logic-level enable input | Active-high with threshold at 75% of VIN - allows direct connection to MCU GPIO without level-shifting; floating prohibited. |
| 2 NC | No-connect terminal | Internally unconnected - must remain unpopulated or left floating; no external tie required. |
| 3 PG | Open-drain Power Good output | Sinks ≤5 mA when VOUT drops below 90% of regulation - requires external pull-up to VOUT or system rail for logic-level signaling. |
| 4 VOUT | Regulated output node | Connects to output capacitor and load; carries full output current - layout must minimize trace inductance for stability. |
| 5 SW | Switch node | High-di/dt node connecting inductor to internal N- and P-channel MOSFETs - requires tight loop area with input/output caps to reduce EMI. |
| 6 PGND | Power ground return | Low-impedance return path for switch currents - must be tied directly to SGND externally and to thermal pad for thermal performance. |
| 7 SGND | Signal ground reference | Reference for error amplifier and feedback circuitry - connects to PGND at single point near IC to avoid noise coupling. |
| 8 VIN | Input supply voltage | Accepts 0.5V–5.5V input; requires ≥4.7 µF local ceramic bypass cap to PGND to support high peak input current. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | MCP1642B variant isolates VOUT from VIN during shutdown via P-MOSFET gate control - prevents battery discharge through load leakage paths. |
| Low-Noise Anti-Ringing Control | Integrated damping circuit suppresses high-frequency ringing at SW node in DCM - reduces radiated EMI without external snubber components. |
| Internal Compensation | Complete Type-II compensation network embedded - eliminates external capacitor/resistor, simplifying design and improving production yield. |
| Inrush Current Limiting | Soft-start ramps switch current limit from 50% to 100% over 550 µs - prevents output overshoot and input voltage sag during cold start. |
| Thermal Shutdown | 150°C junction trip with 35°C hysteresis - protects against sustained overload or poor heatsinking while enabling automatic recovery. |
Applications
| Wireless Sensor Node | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered environmental sensor transmitting data via BLE or LoRaWAN every 5 minutes. IC Role / Device Role / Timing Role: Primary 5.0V regulator powering RF transceiver and microcontroller from single AA/AAA cell. Use Value: 0.9V start-up and 1 µA shutdown current extend shelf life and field deployment duration beyond 5 years. |
Use Scenario: Low-cost industrial control module using PIC16F or PIC18F MCU with analog peripherals and LCD display. IC Role / Device Role / Timing Role: Fixed 5.0V supply for MCU core, I/O, and analog reference - replacing inefficient linear regulators. Use Value: 96% efficiency at 150 mA load reduces thermal load and enables smaller battery packs in sealed enclosures. |
| USB Emergency Backup Charger | Portable Medical Glucose Meter |
Use Scenario: Handheld charger that boosts single Li-ion cell to 5.0V USB output for emergency smartphone charging. IC Role / Device Role / Timing Role: Synchronous boost stage interfaced with USB power delivery controller and load switch. Use Value: 1.8A peak switch current supports >1A output at 3.6V input, enabling faster charge transfer than competing 1A-only solutions. |
Use Scenario: CE-certified blood glucose meter powered by two AAA alkaline cells, requiring stable 5.0V for electrochemical sensing and display. IC Role / Device Role / Timing Role: Primary regulated supply for precision ADC, op-amps, and segment LCD driver. Use Value: 3% output accuracy and <0.1% load regulation ensure consistent sensor biasing and measurement repeatability across 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 | Adjustable output only (1.5–5.5V); no fixed 5.0V option; 0.3V min. start-up; 1.2A max. switch current. | Lacks true output disconnect; uses external compensation; requires VFB resistor network. | Select when adjustable output and ultra-low start-up voltage (<0.5V) are prioritized over fixed 5.0V simplicity and shutdown isolation. |
| Analog Devices ADP5070ARMZ | Higher 2.5 MHz switching frequency; dual-output (boost + inverting); 1.2A switch current; no true disconnect. | Designed for bipolar supplies; includes soft-start disable and spread-spectrum; larger 10-lead MSOP package. | Choose for space-constrained dual-rail systems where 5.0V + –5.0V generation justifies added complexity and cost. |
Compared with TPS61200DRCT and ADP5070ARMZ, MCP1642BT-50I/MS delivers verified fixed 5.0V output with true output disconnect, eliminating external resistors and enabling zero-load battery isolation - critical for long-life portable instrumentation where reliability and BOM simplicity outweigh frequency or dual-rail flexibility.
Availability
MCP1642BT-50I/MS is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, and PIC® MCU power management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MCP1642BT-50I/MS 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 microcontrollers, analog, FPGA, and mixed-signal semiconductors, 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, single-cell battery-powered applications - emphasizing start-up capability below 1V, sub-µA shutdown, and integrated synchronous rectification to maximize runtime in portable electronics.
FAQ
What is the minimum input voltage required for MCP1642BT-50I/MS to start regulating 5.0V output?
The MCP1642BT-50I/MS starts regulating 5.0V output at 0.9V typical input voltage with a 1 mA resistive load, per DS20005253A-page 3. This value is confirmed for the -50 fixed-output variant under standard test conditions (CIN = COUT = 10 µF, L = 4.7 µH). Below this voltage, the device remains in pre-regulation start-up mode with limited current delivery.
Does MCP1642BT-50I/MS require external compensation components?
No, MCP1642BT-50I/MS includes fully integrated Type-II compensation - no external capacitors or resistors are needed. This is explicitly stated in the General Description and confirmed in Section 4.2.9 of DS20005253A. The internal network is optimized for stability with standard 4.7 µH inductors and 4.7–10 µF ceramic output capacitors.
How does the Power Good (PG) pin behave on MCP1642BT-50I/MS?
The PG pin on MCP1642BT-50I/MS is an open-drain output that pulls low when VOUT falls below 90% of nominal 5.0V (i.e., 4.5V), with 3% hysteresis. It sinks up to 5 mA and requires an external pull-up resistor - typically to VOUT - to interface with MCU GPIO or reset controllers, as detailed in Section 3.3 and Table 5-1 of DS20005253A.
Is MCP1642BT-50I/MS compatible with lithium polymer batteries?
Yes, MCP1642BT-50I/MS is explicitly qualified for single-cell Li-Ion and Li-Polymer batteries per the General Description and Applications sections of DS20005253A. Its 0.5V minimum operating input voltage (typ.) and 5.5V absolute maximum input rating safely accommodate the full 2.7–4.2V discharge curve of these chemistries.
What thermal performance can be expected from MCP1642BT-50I/MS in MSOP-8 package?
In the 8L-MSOP package, MCP1642BT-50I/MS has a junction-to-ambient thermal resistance (θJA) of 211°C/W, per DS20005253A-page 5. With 1W dissipation (e.g., 5.0V@200mA, 85% efficiency), junction temperature rise is ~211°C above ambient - confirming need for thermal relief pads and proper copper pour to stay within the +125°C max junction limit.
MCP1642BT-50I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
MCP1642BT-50I/MS FAQ
1.How can I place an order for MCP1642BT-50I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-50I/MS 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/MS reliable?
The price and inventory of MCP1642BT-50I/MS 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/MS is usually 5 days.
3.What payment methods are accepted for MCP1642BT-50I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-50I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-50I/MS?
MCP1642BT-50I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-50I/MS 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/MS?
For technical support, including MCP1642BT-50I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-50I/MS requirements.
6.How does Aetrix verify that MCP1642BT-50I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-50I/MS 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/MS meets industry standards.
7.What is the process for return or replacement of MCP1642BT-50I/MS?
All MCP1642BT-50I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-50I/MS, 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/MS part is unused and in its original packaging.
Return procedure for MCP1642BT-50I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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