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Microchip Technology MCP1642BT-30I/MS
- Part No.:
- MCP1642BT-30I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642BT-30I/MS.pdf
- Description:
- IC REG BOOST 3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
MCP1642BT-30I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery systems, delivering fixed 3.0V output with 1.8A peak switch current, 1 MHz PWM operation, and 0.65V typical start-up voltage. It integrates N- and P-channel MOSFETs, internal compensation, and true output disconnect during shutdown - enabling reliable power for low-voltage portable medical sensors and PIC® MCU subsystems.
For engineers reviewing the MCP1642BT-30I/MS datasheet, MCP1642BT-30I/MS pinout, MCP1642BT-30I/MS application, or MCP1642BT-30I/MS equivalent, key selection criteria include its 0.35V minimum operating input voltage, 1.21V feedback reference, 90% duty cycle limit, Power Good open-drain output, and MSOP-8 package with exposed thermal pad - all critical for ultra-low-power battery-backed designs.
Technical Context
The MCP1642BT-30I/MS implements fixed-frequency (1 MHz) peak-current-mode PWM control with adaptive slope compensation, enabling stable regulation across wide input ranges (0.35V–5.5V) while maintaining low noise via integrated anti-ringing circuitry. Its dual-MOSFET synchronous rectifier eliminates external diode losses and supports true output disconnect in shutdown mode.
Internal bias architecture transitions from VIN to VOUT after start-up, allowing continuous regulation down to 0.35V input at 1 mA load. The device uses a precision 1.21V bandgap reference and closed-loop error amplifier with fully integrated compensation - requiring no external components for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±3%, internally set - eliminates need for external resistor divider and reduces BOM count. |
| Switching Frequency | 1.0 MHz typical (0.85–1.15 MHz range) - enables use of small 4.7 µH inductors and compact 4.7–10 µF ceramic output capacitors. |
| Start-Up Voltage | 0.65V typical at 3.3V VOUT / 1 mA load - supports operation from deeply discharged alkaline or NiMH cells. |
| Peak Switch Current | 1.8A typical - determines maximum deliverable output current (e.g., >600 mA at 2.4VIN/3.3VOUT). |
| Shutdown Current | 1 µA max - preserves battery life in standby; true output disconnect isolates VOUT from VIN when EN = GND. |
| Feedback Reference | 1.21V ±2.5% - sets output accuracy and defines resistor divider ratio for adjustable variants (not used in -30I/MS). |
| Power Good Output | Open-drain, active-low at 90% VOUT with 3% hysteresis - provides MCU-ready status signal without external logic. |
Pinout & Package
Package: 8-Lead MSOP with exposed thermal pad (EP), RoHS-compliant, rated for -40°C to +85°C ambient operation. Thermal resistance θJA = 211°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable logic input | Active-high enable; threshold is 75% of VIN - ensures robust turn-on even with dropping battery voltage. |
| 2 - NC | No connect | Unbonded pin; must remain floating - no internal connection or function in fixed-output variant. |
| 3 - PG | Power Good open-drain | Signals VOUT ≥90% regulation; requires external pull-up - interfaces directly with PIC® MCU GPIO pins. |
| 4 - VOUT | Regulated output node | Connects to output capacitor and load; carries full output current - routed with low-impedance trace for stability. |
| 5 - SW | Switch node | High dv/dt point connecting inductor to internal N-/P-MOSFETs - requires tight layout to minimize EMI and ringing. |
| 6 - PGND | Power ground return | High-current return path for N-MOSFET - must be tied to SGND externally and connected to thermal pad for heat dissipation. |
| 7 - SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator - joined to PGND at single point near IC for PSRR. |
| 8 - VIN | Input supply | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic bypass - powers internal bias before VOUT takeover. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect in shutdown | EN = GND removes DC path between VIN and VOUT - prevents battery drain and output capacitor discharge in sleep mode. |
| Synchronous rectification | Integrated P-channel MOSFET replaces Schottky diode - eliminates 0.3–0.5V forward drop, improving efficiency by ~8–12% at light loads. |
| Low-noise anti-ringing control | Active damping at SW node - suppresses high-frequency oscillations in DCM, reducing radiated EMI without snubbers. |
| Internal compensation | Complete Type-II compensation network embedded - eliminates external capacitor/resistor, simplifying layout and qualification. |
| Inrush current limiting & soft-start | 550 µs soft-start time with controlled current ramp - prevents input voltage sag and output overshoot during cold start from weak batteries. |
Applications
| Wireless Sensor Node | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting via BLE or Sub-GHz RF. IC Role / Device Role / Timing Role: Primary 3.0V rail generator from single AA/AAA alkaline cell (0.9–1.6V range). Use Value: Enables >2-year battery life via 1 µA shutdown current and 0.65V start-up - sustains operation until cell reaches end-of-life voltage. |
Use Scenario: Embedded control system using PIC16F or PIC18F MCU with analog peripherals and EEPROM. IC Role / Device Role / Timing Role: Stable 3.0V supply for MCU core, ADC reference, and I/O buffers under dynamic load switching. Use Value: Delivers >300 mA at 1.5VIN/3.3VOUT with <±3% output accuracy - ensures consistent ADC LSB and timing margin across battery discharge. |
| Portable Medical Monitor | USB Emergency Backup Charger |
Use Scenario: Handheld pulse oximeter powered by single Li-ion cell (3.0–4.2V) with OLED display and optical sensors. IC Role / Device Role / Timing Role: Generates clean 3.0V for analog front-end and digital logic from variable battery input. Use Value: Maintains regulation down to 0.35V input at 1 mA - supports deep discharge detection and graceful shutdown before cell damage. |
Use Scenario: Compact external battery pack converting 1S Li-ion (3.0–4.2V) to regulated 5.0V USB output for emergency phone charging. IC Role / Device Role / Timing Role: Intermediate 3.0V rail for charge management IC and USB interface logic (e.g., TPS65217). Use Value: Provides precise 3.0V reference for USB PD negotiation and overvoltage protection - avoids false disconnects during voltage transients. |
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 (0.9–5.5V); 1.3A peak switch; 0.3V start-up; no true disconnect - only input-to-output bypass. | Lacks true output disconnect; requires external resistor divider for 3.0V; lower peak current limits max output at high VOUT/low VIN. | Prefer when adjustable output or lower start-up voltage is required; avoid if true load isolation in shutdown is mandatory. |
| Analog Devices ADP5070ACPZ-R7 | Fixed 3.3V output; 1.2A peak switch; 0.9V start-up; integrated LDO post-regulator; no PG output. | Higher start-up voltage; lower current capability; adds LDO overhead but improves PSRR - not suitable for 3.0V-only systems. | Choose when ultra-low noise (LDO-filtered) 3.3V rail is needed; reject for 3.0V fixed output or sub-0.7V battery start-up. |
Compared with TPS61200DRCT and ADP5070ACPZ-R7, the MCP1642BT-30I/MS uniquely combines true output disconnect, 3.0V fixed output, 0.65V start-up, and 1.8A peak switch current in an MSOP-8 package - making it optimal for cost-sensitive, long-life portable devices where load isolation and minimal external components are essential.
Availability
MCP1642BT-30I/MS is available at Aetrix Electronics and suitable for wireless sensors, portable medical monitors, and PIC® MCU power supplies requiring stable component supply, extended battery runtime, and guaranteed long-term manufacturability.
Supply support for MCP1642BT-30I/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 devices, and power management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.
The MCP1642B/D family was designed specifically for ultra-low-voltage battery-powered applications - emphasizing minimal start-up voltage, high light-load efficiency, and seamless integration with Microchip's PIC® MCU ecosystem.
FAQ
What is the minimum input voltage required for MCP1642BT-30I/MS to start up and regulate 3.0V output?
The MCP1642BT-30I/MS has a typical start-up voltage of 0.65V at 3.3V output and 1 mA load; for its fixed 3.0V output, start-up occurs at approximately 0.60–0.65V under same conditions. Once running, it maintains regulation down to 0.35V input at 1 mA - verified per DS20005253A-page 3 DC Characteristics table.
Does MCP1642BT-30I/MS require external compensation components?
No. The MCP1642BT-30I/MS includes fully integrated Type-II compensation - no external capacitors or resistors are needed. This is confirmed in Section 4.2.9 and Feature list of DS20005253A, which states "Internal Compensation" as a core feature and eliminates design iteration on loop stability.
How does the Power Good (PG) pin of MCP1642BT-30I/MS behave during startup and fault conditions?
The PG pin is an open-drain output that goes low when VOUT falls below 90% of nominal (i.e., <2.7V for 3.0V output), with 3% hysteresis. It asserts after soft-start completes (~550 µs) and remains low during undervoltage, overload, or thermal shutdown - per DS20005253A-page 5 Electrical Characteristics and Section 4.2.7.
What is the purpose of the NC pin (Pin 2) on MCP1642BT-30I/MS, and how should it be handled on the PCB?
Pin 2 is Not Connected - electrically unconnected and unbonded in the fixed-output MCP1642BT-30I/MS variant. It must remain floating with no trace or solder mask opening; grounding or routing to other nets may cause leakage or ESD vulnerability. Confirmed in Table 3-1 and Section 4.1.4 of DS20005253A.
Can MCP1642BT-30I/MS be used with a 5.0V output requirement?
No. The MCP1642BT-30I/MS is factory-trimmed for fixed 3.0V output only. For 5.0V, Microchip offers the pin-compatible MCP1642BT-50I/MS (same MSOP-8 package, identical features). Attempting to force 5.0V via external feedback violates the fixed-VOUT architecture and will result in incorrect regulation.
MCP1642BT-30I/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):
- 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-MSOP
MCP1642BT-30I/MS FAQ
1.How can I place an order for MCP1642BT-30I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-30I/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-30I/MS reliable?
The price and inventory of MCP1642BT-30I/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-30I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642BT-30I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-30I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-30I/MS?
MCP1642BT-30I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-30I/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-30I/MS?
For technical support, including MCP1642BT-30I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-30I/MS requirements.
6.How does Aetrix verify that MCP1642BT-30I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-30I/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-30I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642BT-30I/MS?
All MCP1642BT-30I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-30I/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-30I/MS part is unused and in its original packaging.
Return procedure for MCP1642BT-30I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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