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Microchip Technology MCP1642BT-ADJI/MC
- Part No.:
- MCP1642BT-ADJI/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642BT-ADJI/MC.pdf
- Description:
- IC REG BOOST ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1642BT-ADJI/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It delivers up to 1 A output at 5.0 V from ≥3.6 V input, features 1.21 V feedback reference, 1 MHz fixed-frequency PWM operation, and true output disconnect shutdown mode. It targets PIC® MCU power rails in single-cell Li-Ion or alkaline portable devices.
For engineers reviewing the MCP1642BT-ADJI/MC datasheet, MCP1642BT-ADJI/MC pinout, MCP1642BT-ADJI/MC application, or MCP1642BT-ADJI/MC equivalent, key selection criteria include start-up voltage (0.65 V typical), peak switch current limit (1.8 A), adjustable output range (1.8–5.5 V), thermal shutdown threshold (+150 °C), and MSOP-8 package compatibility with exposed pad.
Technical Context
The MCP1642BT-ADJI/MC implements peak-current-mode control with adaptive slope compensation, enabling stable operation across wide VIN–VOUT ratios. Its integrated N-channel boost switch (RDS(ON) = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3 Ω) minimize conduction loss while supporting low-noise anti-ringing operation.
Startup begins at 0.65 V (3.3 V out, 1 mA load) using open-loop charge-pump precharge of VOUT, followed by closed-loop PWM regulation. The device maintains regulation down to 0.35 V input (3.3 V out, 1 mA) and includes internal soft-start (550 µs), overtemperature protection (150 °C trip, 35 °C hysteresis), and power-good monitoring (90% VOUT threshold, 600 µs delay).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V typical - enables operation from deeply discharged alkaline or Li-Ion cells without external bias. |
| Input Voltage Range | 0.35 V to <VOUT (max 5.5 V) - supports single-cell battery inputs down to end-of-life voltage. |
| Output Voltage Range | 1.8 V to 5.5 V (adjustable via external resistor divider) - covers common MCU I/O and interface rail requirements. |
| Switching Frequency | 1.0 MHz ±15% - enables use of small 4.7 µH inductors and compact 4.7–10 µF ceramic output capacitors. |
| Peak Switch Current Limit | 1.8 A typical - sets maximum deliverable output current based on boost ratio and efficiency. |
| Feedback Reference Voltage | 1.21 V ±3% - defines output accuracy; used with external resistive divider to set VOUT precisely. |
| Shutdown Current | 1 µA - ensures minimal battery drain during system sleep, critical for multi-year portable sensor life. |
| Thermal Shutdown Threshold | +150 °C with 35 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead MSOP with exposed thermal pad (EP). Pin 2 is NC (not connected); EP must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Logic-level enable input | Active-high (>75% VIN); controls true output disconnect shutdown; must not float. |
| 2 NC | No connection | Unbonded pad; leave unconnected per datasheet - no routing or vias required. |
| 3 PG | Open-drain Power Good output | Asserts low when VOUT falls below 90% of target; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Connects to output capacitor and external feedback divider; carries full load current. |
| 5 SW | Switch node | High dv/dt node connecting inductor to internal N- and P-channel switches; peak current up to 1.8 A. |
| 6 PGND | Power ground return | Low-impedance return path for high-current N-channel switch; tie externally to SGND and EP. |
| 7 SGND | Signal ground reference | Return for error amplifier and VFB comparator; must be shorted to PGND on PCB. |
| 8 VIN | Input supply voltage | Accepts 0.35–5.5 V; requires local 4.7 µF ceramic bypass capacitor to PGND/SGND. |
| 9 EP | Exposed thermal pad | Non-electrical thermal interface; must be soldered to solid copper pour tied to GND for θJA = 211 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect Shutdown | MCP1642B variant isolates VOUT from VIN during EN = low, eliminating leakage paths and preserving output hold-up capacitance. |
| Low-Noise Anti-Ringing Control | Integrated damping circuit suppresses high-frequency oscillations at SW node, reducing radiated EMI without external snubbers. |
| Internal Compensation | Complete Type-II compensation network embedded - eliminates external compensation components and simplifies layout. |
| Inrush Current Limiting & Soft-Start | 550 µs controlled ramp-up prevents output overshoot and limits inrush into bulk output capacitance during startup. |
| Power Good Open-Drain Output | Provides reliable system-level power sequencing signal to MCUs with 600 µs delay and 3% hysteresis for noise immunity. |
| Synchronous Rectification | Integrated P-channel MOSFET replaces Schottky diode, eliminating forward voltage drop and improving light-load efficiency by ~5–8%. |
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 3.3 V rail generator from single 1.5 V alkaline cell, enabling MCU and radio operation during active bursts. Use Value: 0.65 V start-up allows >20% additional battery capacity utilization versus competing boosters; 1 µA shutdown current extends shelf life beyond 5 years. |
Use Scenario: Low-power PIC16F or PIC18F microcontroller running in deep-sleep mode with periodic wake-up for ADC sampling. IC Role / Device Role / Timing Role: Regulated 3.3 V supply with true output disconnect, ensuring zero load on battery during MCU sleep cycles. Use Value: Eliminates need for external load switch; preserves VOUT rail stability during rapid EN toggling; reduces BOM count by one FET and driver. |
| USB Emergency Backup Charger | Hand-Held Medical Instrument |
Use Scenario: Portable power bank using two AA cells to deliver 5.0 V USB output for smartphone charging. IC Role / Device Role / Timing Role: Adjustable 5.0 V boost stage with 1.8 A peak switch current, supporting up to 1 A continuous output at 3.6 V input. Use Value: 96% peak efficiency minimizes heat generation in sealed plastic enclosure; 1 MHz switching allows compact 4.7 µH inductor footprint. |
Use Scenario: Portable blood glucose meter powered by single AAA alkaline cell requiring stable 3.0 V analog front-end supply. IC Role / Device Role / Timing Role: Fixed 3.0 V output regulator with low output ripple (<20 mVpp) and tight line/load regulation (±0.1%). Use Value: Internal compensation and low-noise anti-ringing ensure clean analog supply; ±3% VOUT accuracy meets ISO 15197 clinical measurement tolerance. |
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 | 0.3 V start-up (lower), 1.2 A max output, no true disconnect - uses diode-based bypass in shutdown. | Lacks output isolation; unsuitable where VOUT hold-up or zero-leakage is required. | Prefer MCP1642BT-ADJI/MC when true output disconnect and 1.8 A peak current are mandatory. |
| Analog Devices ADP5070ARMZ-R7 | Higher start-up (0.9 V), dual-output, 2.5 A switch, but larger 10-lead MSOP and no integrated soft-start. | Designed for dual-rail systems; over-specified and costlier for single-output portable use. | Prefer MCP1642BT-ADJI/MC for space-constrained, single-rail, ultra-low-VIN applications with strict size and quiescent current budgets. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1642BT-ADJI/MC uniquely combines sub-0.7 V start-up, true output disconnect, 1.8 A switch capability, and MSOP-8 packaging - making it optimal for single-cell battery systems demanding maximum runtime and minimal board area.
Availability
MCP1642BT-ADJI/MC is available at Aetrix Electronics and suitable for wireless sensors, PIC® MCU power supplies, USB backup chargers, hand-held medical instruments, and GPS receivers requiring stable component supply with long-term manufacturability.
Supply support for MCP1642BT-ADJI/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 devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was designed specifically for ultra-low-input-voltage, high-efficiency boost conversion in battery-powered portable electronics - emphasizing start-up from depleted cells, minimal quiescent current, and integration to reduce external component count.
FAQ
What is the minimum input voltage required for MCP1642BT-ADJI/MC to start regulating 3.3 V output?
The MCP1642BT-ADJI/MC starts regulating a 3.3 V output at 0.65 V typical input voltage with a 1 mA resistive load. This ultra-low start-up voltage enables operation from nearly exhausted alkaline or lithium primary cells. Performance is verified per DS20005253A-page 3, Note 1, and applies specifically to the MCP1642BT-ADJI/MC variant in MSOP-8 package.
Does MCP1642BT-ADJI/MC support adjustable output voltage, and how is it configured?
Yes, MCP1642BT-ADJI/MC is the adjustable version of the MCP1642B family. Output voltage is set using an external resistor divider connected between VOUT, VFB, and GND. The internal 1.21 V reference (VFB) determines VOUT = 1.21 × (1 + RTOP/RBOT). High-value resistors (e.g., 976 kΩ/309 kΩ for 3.3 V) minimize quiescent current and preserve light-load efficiency.
What shutdown behavior does MCP1642BT-ADJI/MC provide, and how is it activated?
MCP1642BT-ADJI/MC implements true output disconnect shutdown: when EN is pulled low (<20% VIN), the internal P-channel switch turns off, breaking the DC path between VIN and VOUT. This isolates the output, preventing battery drain through load capacitance. Shutdown current is 1 µA typical, confirmed in DS20005253A-page 4, IQSHDN parameter.
Can MCP1642BT-ADJI/MC operate with input voltage higher than output voltage?
No - MCP1642BT-ADJI/MC is a boost-only converter. When VIN exceeds VOUT, regulation is lost and VOUT follows VIN minus diode drop (via body diode conduction). The datasheet explicitly states "For VIN > VOUT, VOUT will not remain in regulation" (DS20005253A-page 3, Note 2). It must be used only in step-up configurations.
What package type and thermal characteristics apply to MCP1642BT-ADJI/MC?
MCP1642BT-ADJI/MC is supplied in an 8-lead MSOP package with exposed thermal pad (EP). Its junction-to-ambient thermal resistance is 211 °C/W (DS20005253A-page 5). The EP must be soldered to a PCB ground plane to achieve this rating; omitting EP connection degrades thermal performance and risks thermal shutdown under load.
MCP1642BT-ADJI/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.65V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- 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-ADJI/MC FAQ
1.How can I place an order for MCP1642BT-ADJI/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642BT-ADJI/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-ADJI/MC reliable?
The price and inventory of MCP1642BT-ADJI/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-ADJI/MC is usually 5 days.
3.What payment methods are accepted for MCP1642BT-ADJI/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642BT-ADJI/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642BT-ADJI/MC?
MCP1642BT-ADJI/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642BT-ADJI/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-ADJI/MC?
For technical support, including MCP1642BT-ADJI/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642BT-ADJI/MC requirements.
6.How does Aetrix verify that MCP1642BT-ADJI/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642BT-ADJI/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-ADJI/MC meets industry standards.
7.What is the process for return or replacement of MCP1642BT-ADJI/MC?
All MCP1642BT-ADJI/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642BT-ADJI/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-ADJI/MC part is unused and in its original packaging.
Return procedure for MCP1642BT-ADJI/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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