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Microchip Technology MCP1642B-33I/MS
- Part No.:
- MCP1642B-33I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642B-33I/MS.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,177
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Product details
Overview
MCP1642B-33I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery-powered systems, delivering fixed 3.3V 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 PIC® MCU rails and low-voltage portable sensors.
For engineers reviewing the MCP1642B-33I/MS datasheet, MCP1642B-33I/MS pinout, MCP1642B-33I/MS application, or MCP1642B-33I/MS equivalent, key selection criteria include its 0.35V minimum operating input voltage, ±3% output accuracy over –40°C to +85°C, open-drain Power Good indicator, and MSOP-8 package with exposed thermal pad for thermal management in space-constrained designs.
Technical Context
The MCP1642B-33I/MS implements peak-current-mode PWM control with adaptive slope compensation and an integrated 1.21V reference for precise regulation. Its low-noise anti-ringing switch suppresses high-frequency ringing at the SW node during discontinuous conduction mode, reducing EMI without external snubbers.
True output disconnect is achieved by fully turning off both the N-channel boost switch and P-channel synchronous rectifier when EN is low - eliminating the body-diode path and limiting shutdown current to ≤1 µA while preserving output capacitor charge. The device operates down to 0.35V input after startup and supports input voltages up to 5.5V (but less than VOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over –40°C to +85°C; no external feedback resistors required. |
| Switching Frequency | 1.0 MHz typical (0.85–1.15 MHz range); enables compact 4.7 µH inductor and low-profile 4.7–10 µF ceramic capacitors. |
| Peak Switch Current | 1.8A typical; supports ≥800 mA output at 3.3V from 3.3V input, enabling efficient single-cell Li-ion to 3.3V conversion. |
| Start-Up Voltage | 0.65V typical into 1 mA load at 3.3V output; allows operation from deeply discharged alkaline or NiMH cells. |
| Shutdown Current | ≤1 µA with EN = GND; enables multi-year battery life in always-on sensor nodes and medical wearables. |
| Power Good Output | Open-drain PG pin asserts low when VOUT falls below 90% of nominal (2.97V); provides clean MCU reset or sequencing signal. |
| Operating Temperature | –40°C to +85°C ambient; junction temperature protected to +150°C with 35°C hysteresis for robust industrial deployment. |
Pinout & Package
Package: 8-lead MSOP (3.0 mm × 4.9 mm) with exposed thermal pad (EP), rated θJA = 211°C/W. Thermal pad must be soldered to PCB ground plane for optimal thermal performance and reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable logic input | Active-high enable; requires >75% of VIN to activate; <20% of VIN disables regulator and engages true output disconnect. |
| 2 - NC | No connect | Unbonded pin; must remain unconnected per datasheet; not internally tied to any circuit node. |
| 3 - PG | Open-drain Power Good | Sinks current when VOUT < 2.97V; requires external pull-up to VOUT or system rail for MCU interface. |
| 4 - VOUT | Regulated output node | Delivers fixed 3.3V; connects to output capacitor and load; also serves as reference point for internal feedback network. |
| 5 - SW | Switch node | Connects boost inductor; carries up to 1.8A peak current; ties internal N- and P-channel MOSFETs; high di/dt node requiring tight layout. |
| 6 - PGND | Power ground | High-current return for N-channel switch; must be connected externally to SGND and system ground plane. |
| 7 - SGND | Signal ground | Low-noise reference for error amplifier and VFB comparator; routed separately from PGND then joined at single point. |
| 8 - VIN | Input supply | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic bypass capacitor; supplies bias during startup before VOUT takeover. |
| 9 - EP | Exposed thermal pad | Non-electrical thermal interface; must be soldered to PCB copper pour tied to PGND/SGND for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | EN = low fully isolates VOUT from VIN via dual-MOSFET cutoff - prevents battery drain and output discharge in standby. |
| Low-noise anti-ringing control | Integrated damping circuit eliminates high-frequency oscillations at SW node in DCM, reducing radiated EMI without snubber components. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by >5% vs. asynchronous designs at light-to-moderate loads. |
| Internal compensation | Full Type-II compensation network embedded - no external capacitor/resistor required, simplifying BOM and layout for stable 3.3V regulation. |
| Inrush current limiting & soft-start | Gradual ramp of peak current limit (550 µs to full 1.8A) prevents input voltage sag and output overshoot during startup from weak sources. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Continuous glucose monitor powered by single AAA alkaline cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3V rail generator; regulates output across 0.9–1.6V input decay; provides PG signal for firmware health check. Use Value: 0.65V start-up and ≤1 µA shutdown current extend battery life beyond 3 years; true disconnect prevents load-induced battery leakage. |
Use Scenario: Low-power PIC16F15313-based environmental sensor node operating in deep-sleep mode (1 µA avg). IC Role / Device Role / Timing Role: Always-on 3.3V supply for MCU core and ADC; PG output triggers wake-up interrupt on brownout detection. Use Value: Fixed 3.3V output with ±3% accuracy ensures consistent ADC reference and I/O voltage; 1 MHz switching avoids audible noise in sleep cycles. |
| Wireless Sensor Nodes | USB Emergency Backup Charger |
Use Scenario: LoRaWAN soil moisture sensor using CR2032 coin cell, transmitting every 15 minutes. IC Role / Device Role / Timing Role: Boost converter supplying 3.3V to RF transceiver during 100-ms transmit burst; handles 800 mA peak load. Use Value: 1.8A switch current and 96% peak efficiency sustain 3.3V under pulse load; low 0.35V operating voltage extracts last usable energy from depleted cell. |
Use Scenario: Portable power bank converting two AA NiMH cells (2.4V) to 5V USB output for emergency smartphone charging. IC Role / Device Role / Timing Role: Intermediate 3.3V rail for USB controller and status LED; enables precise voltage sequencing before 5V boost stage activation. Use Value: Fixed 3.3V output eliminates resistor divider errors; PG signal confirms stable rail before enabling downstream 5V converter, preventing USB enumeration failure. |
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 TPS610992RTER | Fixed 3.3V output; 1.2A switch current; 0.7V start-up; no true output disconnect; 1.2 MHz switching. | Lacks true disconnect - output remains coupled to input in shutdown; higher quiescent current (800 nA vs. 1 µA) but lower start-up voltage. | Prefer when ultra-low start-up voltage outweighs need for battery isolation; verify PG functionality matches MCU requirements. |
| Analog Devices ADP5070ACPZ-R7 | Adjustable output (1.2–5.5V); 1.2A switch current; 0.9V start-up; includes LDO post-regulator; no PG output. | Requires external feedback resistors; adds complexity and quiescent current; lacks PG flag and true disconnect. | Choose only if adjustable output or integrated LDO is mandatory; otherwise, MCP1642B-33I/MS offers simpler, more integrated 3.3V solution. |
Compared with TPS610992RTER and ADP5070ACPZ-R7, the MCP1642B-33I/MS delivers superior battery longevity via true output disconnect and lower shutdown current, while maintaining higher peak current capability for demanding pulsed loads - making it optimal for long-life, single-cell, microcontroller-centric applications.
Availability
MCP1642B-33I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power rails, wireless sensor nodes, USB backup chargers, and GPS receivers requiring stable component supply across extended production lifecycles.
Supply support for MCP1642B-33I/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 Inc. 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 - delivering high-efficiency step-up conversion from single-cell sources (alkaline, Li-ion, NiMH) with minimal external components and robust protection features.
FAQ
What is the minimum input voltage required for the MCP1642B-33I/MS to start up and regulate 3.3V?
The MCP1642B-33I/MS has a typical start-up voltage of 0.65V into a 1 mA resistive load at 3.3V output. This allows reliable operation from deeply discharged single-cell alkaline or NiMH batteries. After startup, it continues regulating down to 0.35V input at light loads - confirmed in the Electrical Characteristics table under "Minimum Input Voltage After Start-Up".
Does the MCP1642B-33I/MS require external feedback resistors to set the 3.3V output?
No. The MCP1642B-33I/MS is a fixed-output variant with an internal resistor divider calibrated for 3.3V ±3% accuracy. Pin 2 (VFB) is unconnected (NC) in this version - eliminating external components, saving board space, and improving light-load efficiency by avoiding divider current loss.
How does the true output disconnect feature work in the MCP1642B-33I/MS during shutdown?
When EN is pulled low, the MCP1642B-33I/MS turns off both its internal N-channel boost switch and P-channel synchronous rectifier - physically breaking the DC path between VIN and VOUT. This prevents battery drain through the MOSFET body diode and maintains output capacitor charge, unlike bypass-mode alternatives.
What is the purpose of the exposed thermal pad (EP) on the MCP1642B-33I/MS MSOP package?
The exposed thermal pad (Pin 9) on the MCP1642B-33I/MS MSOP package is a non-electrical thermal interface. It must be soldered to a PCB copper pour tied to PGND/SGND to dissipate heat - lowering junction temperature and improving reliability under sustained 800 mA loads. Its θJA is 211°C/W without it, but effective thermal resistance drops significantly with proper pad connection.
Can the MCP1642B-33I/MS drive a 500 mA load at 3.3V from a 1.5V alkaline cell?
Yes. Per the Typical Application Curves (Figure 2-7), the MCP1642B-33I/MS delivers >600 mA at 3.3V output from 2.4V input, and >175 mA from 1.2V input. At 1.5V input, characterization data supports ~300–400 mA - sufficient for many MCU+sensor combinations. For 500 mA, a minimum 1.8V input is recommended per datasheet load curves.
MCP1642B-33I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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-MSOP
MCP1642B-33I/MS FAQ
1.How can I place an order for MCP1642B-33I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-33I/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 MCP1642B-33I/MS reliable?
The price and inventory of MCP1642B-33I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1642B-33I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642B-33I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-33I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642B-33I/MS?
MCP1642B-33I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-33I/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 MCP1642B-33I/MS?
For technical support, including MCP1642B-33I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-33I/MS requirements.
6.How does Aetrix verify that MCP1642B-33I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642B-33I/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 MCP1642B-33I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642B-33I/MS?
All MCP1642B-33I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-33I/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 MCP1642B-33I/MS part is unused and in its original packaging.
Return procedure for MCP1642B-33I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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