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Microchip Technology MCP1642DT-33I/MS
- Part No.:
- MCP1642DT-33I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642DT-33I/MS.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
MCP1642DT-33I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for low-voltage battery-powered systems. It delivers 3.3V output from inputs as low as 0.65V start-up voltage, supports up to 800 mA output at 3.3V with 3.3V input, and integrates both N-Channel boost and P-Channel synchronous rectifier switches in an 8-lead MSOP package. It is used in PIC® MCU power supplies and single-cell Li-Ion to 3.3V conversion.
For engineers reviewing the MCP1642DT-33I/MS datasheet, MCP1642DT-33I/MS pinout, MCP1642DT-33I/MS application, or MCP1642DT-33I/MS equivalent, key selection criteria include verified 0.65V start-up capability, 1.8A peak switch current limit, true output disconnect shutdown mode, 1 MHz fixed-frequency PWM operation, and integrated soft-start with Power Good open-drain output.
Technical Context
The MCP1642DT-33I/MS implements peak-current-mode PWM control with adaptive slope compensation, enabling stable operation across wide input (0.35V–5.0V) and output (3.3V fixed) ranges. Its internal 1.21V feedback reference and integrated compensation eliminate external loop components.
It features dual shutdown logic: EN >75% VIN enables regulation; EN <20% VIN triggers true output disconnect (MCP1642B variant), isolating VOUT from VIN via P-Channel switch turn-off while maintaining sub-1 µA shutdown current. The PG pin asserts low when VOUT falls below 90% of 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3%, internally trimmed - eliminates external resistor divider and reduces BOM count. |
| Start-Up Voltage | 0.65V typical at 1 mA load - enables operation from deeply discharged alkaline or NiMH cells. |
| Peak Switch Current Limit | 1.8A typical - supports high transient loads without cycle-by-cycle foldback or external current sensing. |
| Switching Frequency | 1.0 MHz ±15% - enables use of small 4.7 µH inductors and compact 4.7–10 µF ceramic output capacitors. |
| Shutdown Current | 1 µA maximum - preserves battery life during MCU sleep modes with true output disconnect. |
| Power Good Threshold | 90% of 3.3V (2.97V) with 3% hysteresis - provides reliable MCU reset or sequencing signal without external comparator. |
| Operating Temperature | -40°C to +85°C ambient - qualified for industrial portable equipment and medical sensors. |
Pinout & Package
Package: 8-lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), with exposed thermal pad (EP) not present in MSOP variant - thermal resistance θJA = 211°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Logic-level enable input | EN >75% VIN enables regulation; EN <20% VIN forces true output disconnect - no pull-up required, but must not float. |
| 2 NC | No connect | Pin 2 is unconnected in fixed-output variants like MCP1642DT-33I/MS - no routing or soldering needed. |
| 3 PG | Open-drain Power Good output | Sinks ≥5 mA when VOUT < 2.97V; requires external pull-up to VOUT or system rail for MCU interrupt or reset signaling. |
| 4 VOUT | Regulated 3.3V output node | Connects directly to output capacitor and load - carries full output current; internal P-Channel source ties here. |
| 5 SW | Switch node | Connects boost inductor between VIN and SW - handles up to 1.8A peak current and high dv/dt; requires tight layout to minimize EMI. |
| 6 PGND | Power ground return | Low-impedance return path for N-Channel switch - must be tied externally to SGND with short, wide copper pour. |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator - connects externally to PGND; separates noise-sensitive analog paths from power loops. |
| 8 VIN | Input supply voltage | Accepts 0.35V–5.0V; requires ≥4.7 µF local ceramic bypass capacitor to suppress input ripple and support peak switch current. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect shutdown | MCP1642B variant isolates VOUT from VIN during EN=low - prevents battery drain through load leakage or output capacitor discharge. |
| Low-noise anti-ringing control | Integrated damping circuit suppresses high-frequency oscillations at SW node - reduces radiated EMI without snubbers or ferrites. |
| Internal synchronous rectification | Eliminates external Schottky diode - improves efficiency by ~8% at 100 mA and reduces thermal stress in compact MSOP package. |
| Internal compensation | Full Type II compensation network embedded - removes need for external RC networks and simplifies design validation. |
| Inrush current limiting & soft-start | 550 µs soft-start time with controlled ramp of current limit - prevents output overshoot and input voltage sag during cold start from weak batteries. |
Applications
| PIC® MCU Power Supply | Single-Cell Li-Ion to 3.3V Conversion |
|---|---|
Use Scenario: Powering 8-bit PIC microcontrollers from aging alkaline or NiMH cells in handheld instruments. IC Role / Device Role / Timing Role: Primary 3.3V regulator delivering up to 300 mA at 1.5V input; provides clean, regulated rail independent of battery voltage decay. Use Value: Enables reliable MCU operation down to 0.65V input - extends usable battery life by 20–30% versus higher-startup alternatives. |
Use Scenario: Converting 3.0–4.2V Li-Ion battery output to stable 3.3V for BLE modules and sensors in wearables. IC Role / Device Role / Timing Role: Fixed-output boost converter operating in PWM mode at 1 MHz - maintains constant switching frequency for predictable EMI filtering. Use Value: Delivers 800 mA at 3.3V with >92% efficiency at 3.6V input - avoids linear regulator dropout losses and thermal derating. |
| USB Emergency Backup Charger | Wireless Sensor Node Power |
Use Scenario: Portable USB power bank using two AA alkaline cells to charge smartphones via 5V USB output. IC Role / Device Role / Timing Role: Intermediate 3.3V rail generator feeding a secondary 5V boost stage - ensures stable gate drive and logic for main converter. Use Value: 0.35V minimum operating voltage allows extraction of residual energy from near-dead batteries - increases total usable mAh per cell. |
Use Scenario: Ultra-low-power environmental sensor node powered by coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Always-on 3.3V supply with 1 µA shutdown current - powers RF transceiver and ADC only during wake-up bursts. Use Value: True output disconnect prevents load leakage current from discharging battery during 99%+ sleep time - extends shelf life to >5 years. |
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 switch limit, no true disconnect - uses diode-based bypass in shutdown. | Lacks output isolation; unsuitable where load backfeed must be prevented. | Prefer MCP1642DT-33I/MS when battery isolation during sleep is mandatory. |
| MAX17222ATA+ | 0.4V start-up, 0.8A switch limit, 1.8V–5.25V adjustable output - no fixed 3.3V option. | Requires external resistors; lower peak current limits output capability at high VIN/VOUT ratios. | Prefer MCP1642DT-33I/MS for plug-and-play 3.3V design with higher output current headroom. |
Compared with TPS61200DRCT and MAX17222ATA+, the MCP1642DT-33I/MS uniquely combines verified 0.65V start-up, true output disconnect, and 1.8A peak switch current in a fixed 3.3V MSOP solution - making it optimal for battery-constrained PIC MCU and sensor applications requiring zero standby leakage.
Availability
MCP1642DT-33I/MS is available at Aetrix Electronics and suitable for PIC® MCU power supplies, wireless sensor nodes, and USB emergency backup chargers requiring stable component supply across industrial temperature range and long-lifecycle production.
Supply support for MCP1642DT-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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The MCP1642B/D product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in portable battery-powered systems - emphasizing start-up from depleted cells and minimal external components.
FAQ
What is the minimum input voltage required for the MCP1642DT-33I/MS to start regulating 3.3V output?
The MCP1642DT-33I/MS has a typical start-up voltage of 0.65V at 1 mA load for 3.3V output, verified per DS20005253A-page 3. This enables operation from one deeply discharged alkaline or NiMH cell. Once started, it continues regulation down to 0.35V input at light load - a key differentiator for battery longevity in portable designs.
Does the MCP1642DT-33I/MS support true output disconnect during shutdown?
Yes, the MCP1642DT-33I/MS is part of the MCP1642B family and implements true output disconnect: when EN is pulled low, the internal P-Channel switch turns off, breaking the DC path between VIN and VOUT. This prevents battery drain through load leakage - critical for long-term storage in medical or sensor applications.
What is the switching frequency of the MCP1642DT-33I/MS and how stable is it over temperature?
The MCP1642DT-33I/MS operates at a fixed 1.0 MHz switching frequency with ±15% tolerance over -40°C to +85°C, as specified in DS20005253A-page 5. Figure 2-11 confirms frequency variation remains within 988–1004 kHz across ambient temperature - enabling consistent EMI filter design and predictable inductor sizing.
Can the MCP1642DT-33I/MS be used with a 5.0V output instead of 3.3V?
No - the MCP1642DT-33I/MS is a fixed 3.3V output variant (denoted by "-33" in the part number). To achieve 5.0V, you must select MCP1642DT-50I/MS or the adjustable version MCP1642DT-ADJI/MS with external resistor divider. Using the -33 variant for 5.0V output is not supported and will result in regulation failure.
What package type does the MCP1642DT-33I/MS use and is thermal pad connection required?
The MCP1642DT-33I/MS uses the 8-lead MSOP package (3.0 mm × 4.9 mm), which does not include an exposed thermal pad (EP). Unlike the 2x3 DFN variant, the MSOP relies on standard lead-frame conduction - its θJA is 211°C/W per DS20005253A-page 5, so PCB copper area under the package is recommended for thermal relief at full load.
MCP1642DT-33I/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):
- 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
MCP1642DT-33I/MS FAQ
1.How can I place an order for MCP1642DT-33I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642DT-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 MCP1642DT-33I/MS reliable?
The price and inventory of MCP1642DT-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 MCP1642DT-33I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642DT-33I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642DT-33I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642DT-33I/MS?
MCP1642DT-33I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642DT-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 MCP1642DT-33I/MS?
For technical support, including MCP1642DT-33I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642DT-33I/MS requirements.
6.How does Aetrix verify that MCP1642DT-33I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642DT-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 MCP1642DT-33I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642DT-33I/MS?
All MCP1642DT-33I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642DT-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 MCP1642DT-33I/MS part is unused and in its original packaging.
Return procedure for MCP1642DT-33I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642DT-33I/MS Tags
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