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Microchip Technology MCP1642DT-50I/MC
- Part No.:
- MCP1642DT-50I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642DT-50I/MC.pdf
- Description:
- IC REG BOOST 5V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,645
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Product details
Overview
MCP1642DT-50I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for single-cell battery-powered systems, delivering 5.0V output from inputs as low as 0.9V (typical start-up), with 1.8A peak switch current, 1 MHz fixed-frequency PWM operation, and integrated true load disconnect during shutdown.
For engineers reviewing the MCP1642DT-50I/MC datasheet, MCP1642DT-50I/MC pinout, MCP1642DT-50I/MC application, or MCP1642DT-50I/MC equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves at 2.5V→5.0V, real-world load capability up to 1A, and precise alternative selection guidance for portable power design.
Technical Context
The MCP1642DT-50I/MC implements a peak-current-mode, fixed-frequency (1 MHz) synchronous boost architecture with adaptive slope compensation and lossless current sensing. Its internal N-Channel (0.15 Ω RDS(ON)) and P-Channel (0.3 Ω RDS(ON)) switches enable high-efficiency conversion across ultra-low input voltages (0.35V operating, 0.9V start-up for 5.0V output).
It integrates soft-start (550 µs), overtemperature protection (150°C trip, 35°C hysteresis), open-drain Power Good (90% VOUT threshold, 600 µs delay), and logic-controlled shutdown consuming ≤1 µA - with true output disconnect (MCP1642B variant) isolating VOUT from VIN when EN = GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3%, regulated via internal feedback divider - eliminates external resistors and reduces BOM count. |
| Input Voltage Range | 0.35V to 5.5V (operating); 0.9V typical start-up for 5.0V output - supports deeply discharged alkaline/Li-ion cells without external bias. |
| 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 | 1.8A typical - sustains ≥1A output at 3.3VIN→5.0VOUT, critical for USB backup chargers and PIC MCU power rails. |
| Efficiency | Up to 96% typical - achieved via synchronous rectification and low-RDS(ON) integrated MOSFETs, verified at 2.5VIN/5.0VOUT/100 mA. |
| Shutdown Current | ≤1 µA - ensures negligible battery drain in standby, essential for wireless sensors and medical wearables. |
| Power Good Output | Open-drain PG with 90% VFB threshold and 3% hysteresis - provides reliable MCU-ready status signaling without external comparators. |
Pinout & Package
Package: 8-Lead 2x3 DFN with exposed thermal pad (EP). Thermal resistance θJA = 68°C/W enables high-power density in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | Logic-high (>75% VIN) enables regulation; logic-low (<20% VIN) forces true output disconnect and ≤1 µA shutdown current. |
| 2 NC | No-connect terminal | Not internally bonded - must be left floating or tied to GND per layout guidelines; no electrical function. |
| 3 PG | Open-drain Power Good | Sinks current when VOUT drops below 90% of 5.0V; requires external pull-up to interface with MCU I/O or reset logic. |
| 4 VOUT | Regulated 5.0V output | Connects to output capacitor and load; carries full output current; internal P-Channel source node. |
| 5 SW | Switch node | High-current path (1.8A peak) between inductor and internal N/P-MOSFETs; requires tight layout to minimize EMI. |
| 6 PGND | Power ground return | Low-impedance return for N-Channel switch; must be connected externally to SGND and system GND plane. |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator; connects externally to PGND to avoid ground bounce. |
| 8 VIN | Input supply voltage | Accepts 0.35–5.5V; requires ≥4.7 µF local ceramic decoupling to suppress input ripple and ESR-related losses. |
| 9 EP | Exposed thermal pad | Electrically isolated copper pad; must be soldered to PCB thermal plane for θJA = 68°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | MCP1642B variant fully isolates VOUT from VIN during shutdown - prevents battery discharge through load leakage paths. |
| Ultra-low start-up voltage | 0.9V typical for 5.0V output enables operation from near-dead alkaline or Li-ion cells without auxiliary startup circuitry. |
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss, improves efficiency by ~8–12% vs. asynchronous designs. |
| Anti-ringing switch control | Damps high-frequency oscillations at SW node in discontinuous conduction mode - lowers radiated EMI without snubbers. |
| Internal compensation | Full Type-II compensation network embedded - removes need for external RC networks and simplifies loop stability tuning. |
Applications
| USB Emergency Backup Charger | PIC® MCU Power Supply |
|---|---|
Use Scenario: Portable battery pack converting single-cell Li-ion (3.0–4.2V) to regulated 5.0V for USB charging of smartphones or accessories. IC Role / Device Role / Timing Role: Primary synchronous boost regulator providing stable 5.0V/1A output with true disconnect to preserve battery charge when not in use. Use Value: Enables >800 mA output at 3.3VIN→5.0VOUT and maintains ≤1 µA shutdown current - extends usable battery life by >30% vs. legacy boost ICs. |
Use Scenario: Powering 3.3V or 5.0V PIC microcontrollers from one- or two-cell alkaline batteries in handheld instruments or sensor nodes. IC Role / Device Role / Timing Role: System-level voltage translator and regulator with Power Good signaling to coordinate MCU wake-up and brown-out detection. Use Value: 0.35V minimum operating input allows PIC operation down to 0.9V battery voltage; PG output triggers MCU reset before VDD falls out of spec. |
| Wireless Sensor Node | Personal Medical Device |
Use Scenario: Low-power BLE or LoRaWAN sensor using coin-cell or AAA alkaline batteries to generate 5.0V for RF transceiver and analog front-end. IC Role / Device Role / Timing Role: High-efficiency boost stage with pulse-skipping PWM mode to maintain low noise while adapting to dynamic load bursts. Use Value: 96% peak efficiency at 100 mA and ≤1 µA quiescent current in shutdown extend shelf life beyond 5 years in storage. |
Use Scenario: Portable glucose meter or pulse oximeter powered by single AA alkaline, requiring stable 5.0V for display backlight and ADC reference. IC Role / Device Role / Timing Role: Safety-critical power manager with overtemperature shutdown (150°C) and undervoltage immunity - no UVLO to prevent premature cutoff. Use Value: True output disconnect prevents reverse current flow into depleted battery - meets IEC 62304 Class B software safety requirements. |
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 | 0.3V start-up, 1.2A max output, no true disconnect, 5-pin SOT-23 package | Lacks output isolation in shutdown - unsuitable for battery-backed systems requiring zero-load leakage. | Select only if board space is critical and true disconnect is unnecessary; verify 5.0V accuracy (±4%) vs. MCP1642DT-50I/MC's ±3%. |
| MAX77801EWA+T | 2.5–5.5V input, 5.0V fixed output, 1.2A, I²C programmable, 16-pin WLP | Requires digital interface and external firmware - adds complexity for simple analog-only designs. | Choose when dynamic voltage scaling or telemetry is needed; avoid if minimizing BOM and firmware overhead is priority. |
Compared with TPS61200DRCT and MAX77801EWA+T, the MCP1642DT-50I/MC delivers superior ultra-low-voltage start-up (0.9V), guaranteed true output disconnect, and higher peak current (1.8A), making it optimal for cost-sensitive, battery-life-critical portable devices without digital control.
Availability
MCP1642DT-50I/MC is available at Aetrix Electronics and suitable for USB emergency backup chargers, PIC® MCU power supplies, wireless sensor nodes, and personal medical devices requiring stable component supply with long-term lifecycle support.
Supply support for MCP1642DT-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1642B/D family was designed specifically for ultra-low-input-voltage, high-efficiency boost conversion in single-cell battery-powered portable electronics - emphasizing minimal external components, true load isolation, and robust operation across wide temperature ranges (-40°C to +85°C).
FAQ
What is the minimum input voltage required for MCP1642DT-50I/MC to start regulating 5.0V output?
The MCP1642DT-50I/MC has a typical start-up voltage of 0.9V for 5.0V output under 1 mA load, verified per DS20005253A-page 3. This enables operation from nearly depleted alkaline or Li-ion cells. Once started, it continues regulation down to 0.5V input (typical), with full functionality maintained across -40°C to +85°C ambient range.
Does MCP1642DT-50I/MC support true output disconnect during shutdown?
Yes, the MCP1642DT-50I/MC is part of the MCP1642B series, which implements true output disconnect: when EN is pulled low, the internal P-Channel MOSFET turns off completely, eliminating the DC path between VIN and VOUT. This prevents battery discharge through load leakage, and input current drops to ≤1 µA - confirmed in Section 4.1.1 and Table 4-1 of the datasheet.
What package type and thermal characteristics does MCP1642DT-50I/MC use?
The MCP1642DT-50I/MC uses an 8-lead 2x3 DFN package with exposed thermal pad (EP). Its junction-to-ambient thermal resistance is 68°C/W, significantly lower than the MSOP variant (211°C/W), enabling higher continuous output current in compact layouts. The EP must be soldered to a PCB thermal plane for rated performance.
How does the Power Good (PG) pin on MCP1642DT-50I/MC function?
The PG pin on MCP1642DT-50I/MC is an open-drain output that pulls low when VOUT falls below 90% of 5.0V (i.e., 4.5V), with 3% hysteresis. It asserts after a 600 µs delay once regulation is achieved and responds within 250 µs to output faults. A pull-up resistor to VOUT or another rail is required for proper MCU interfacing - detailed in Section 3.3 and DC Characteristics table.
Can MCP1642DT-50I/MC operate efficiently at light loads typical in wireless sensors?
Yes, the MCP1642DT-50I/MC employs pulse-skipping PWM mode at light loads to maintain high efficiency - achieving >85% efficiency at 1 mA output (2.5V→5.0V), as shown in Figure 2-6. Its 1.21V feedback reference and <1 nA VFB bias current minimize divider losses, and internal compensation ensures stable regulation without external tuning.
MCP1642DT-50I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Cut Tape (CT)
- 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)
MCP1642DT-50I/MC FAQ
1.How can I place an order for MCP1642DT-50I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642DT-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 MCP1642DT-50I/MC reliable?
The price and inventory of MCP1642DT-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 MCP1642DT-50I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642DT-50I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642DT-50I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642DT-50I/MC?
MCP1642DT-50I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642DT-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 MCP1642DT-50I/MC?
For technical support, including MCP1642DT-50I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642DT-50I/MC requirements.
6.How does Aetrix verify that MCP1642DT-50I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642DT-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 MCP1642DT-50I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642DT-50I/MC?
All MCP1642DT-50I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642DT-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 MCP1642DT-50I/MC part is unused and in its original packaging.
Return procedure for MCP1642DT-50I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642DT-50I/MC Tags
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