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Microchip Technology MCP1642D-33I/MS
- Part No.:
- MCP1642D-33I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642D-33I/MS.pdf
- Description:
- IC REG BOOST 3.3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
MCP1642D-33I/MS from Microchip Technology is a synchronous step-up DC-DC converter with fixed 3.3V output, 1 MHz switching frequency, 0.65V typical start-up voltage, 1.8A peak switch current limit, and input-to-output bypass shutdown mode. It delivers up to 800 mA at 3.3V output from 3.3V input and supports single-cell Li-Ion, alkaline, or NiMH battery-powered portable instrumentation.
For engineers reviewing the MCP1642D-33I/MS datasheet, MCP1642D-33I/MS pinout, MCP1642D-33I/MS application, or MCP1642D-33I/MS equivalent, key selection criteria include low-voltage start-up capability, true input-to-output bypass in shutdown, ±3% output voltage accuracy over –40°C to +85°C, integrated synchronous rectification, and MSOP-8 package thermal performance (θJA = 211°C/W).
Technical Context
The MCP1642D-33I/MS implements fixed-frequency peak-current-mode PWM control with adaptive slope compensation and internal 1.21V feedback reference. Its architecture integrates an N-channel boost switch (RDS(ON) = 0.15Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3Ω), enabling high efficiency across wide input ranges without external compensation.
In shutdown, the device enables input-to-output bypass via the internal P-channel MOSFET while drawing ≤1 µA quiescent current. Power Good (PG) provides open-drain status signaling with 90% VOUT threshold and 3% hysteresis, supporting MCU interface for supply monitoring and sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% over –40°C to +85°C; no external resistor divider 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. |
| Start-Up Voltage | 0.65V typical into 1 mA load at 3.3V output; supports operation from deeply discharged single-cell batteries. |
| Peak Switch Current Limit | 1.8A typical; determines maximum deliverable output current (e.g., >800 mA at VIN ≥3.3V, VOUT = 3.3V). |
| Shutdown Mode | Input-to-output bypass (not true disconnect); maintains DC path from VIN to VOUT while consuming ≤1 µA. |
| Power Good Output | Open-drain PG with 90% VOUT activation threshold, 600 µs delay, and 250 µs response time for reliable MCU supervision. |
| Operating Temperature | –40°C to +85°C ambient; junction temperature protected to +150°C with 35°C hysteresis. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), exposed thermal pad not electrically connected - must be soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; requires >75% of VIN to activate, <20% to disable; no floating allowed. |
| 2 NC | No connect | Not internally bonded; must remain unconnected on PCB. |
| 3 PG | Open-drain Power Good output | Sinks current when VOUT drops below 90% of regulation; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Delivers fixed 3.3V; connects to output capacitor and load; internal feedback divider tied internally. |
| 5 SW | Switch node | Connects boost inductor; carries up to 1.8A peak current; ties internal N- and P-channel switch terminals. |
| 6 PGND | Power ground return | High-current return path for N-channel switch; must be shorted externally to SGND. |
| 7 SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator; externally tied to PGND. |
| 8 VIN | Input supply voltage | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic decoupling to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage start-up | 0.65V typical start-up into 1 mA load at 3.3V output enables use with near-dead alkaline or Li-Ion cells. |
| Synchronous rectification | Integrated P-channel rectifier (RDS(ON) = 0.3Ω) eliminates external Schottky loss, improving light-load efficiency. |
| Anti-ringing control | Integrated damping circuit suppresses high-frequency oscillations at SW node, reducing EMI in portable designs. |
| Input-to-output bypass | EN = low connects VIN directly to VOUT via internal P-MOSFET, sustaining MCU sleep power without battery drain. |
| Internal compensation | Full Type II compensation network embedded - no external capacitors or resistors needed for stable loop response. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered glucose meter or pulse oximeter operating from single AA/AAA alkaline cells. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator enabling analog front-end, ADC, and BLE radio operation. Use Value: 0.65V start-up extends usable battery life by >20% compared to conventional boosters; ±3% VOUT accuracy ensures sensor reference stability. |
Use Scenario: Powering PIC16/PIC18 microcontrollers in low-power handheld tools or remote controls. IC Role / Device Role / Timing Role: Regulated 3.3V supply with PG signal for MCU brown-out detection and wake-up sequencing. Use Value: Input-to-output bypass mode sustains MCU RAM retention during deep sleep with <1 µA system quiescent draw. |
| Wireless Sensor Nodes | USB Emergency Backup Charger |
Use Scenario: LoRaWAN or Zigbee end-node powered by two NiMH cells (2.4V nominal). IC Role / Device Role / Timing Role: Efficient 3.3V rail generation for RF transceiver, sensor interface, and ultra-low-power MCU. Use Value: 96% peak efficiency at 100 mA load minimizes thermal rise in sealed enclosures; 1 MHz operation allows small passive footprint. |
Use Scenario: Portable battery pack converting 1.5V alkaline or 3.7V Li-Po to regulated 5V USB output. IC Role / Device Role / Timing Role: Intermediate 3.3V rail for charge controller logic and USB enumeration IC. Use Value: 800 mA output capability at 3.3V supports fast-charging logic even as input drops to 2.4V; soft-start prevents inrush into USB data lines. |
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, 0.5A max IOUT at 3.3V, no PG output, 5-pin DSBGA package | Lacks Power Good signaling and input-to-output bypass; suited for space-constrained, lower-current apps | Select when board area is critical and PG supervision is unnecessary; verify thermal derating for 800 mA loads. |
| MAX17222ETA+ | 0.4V start-up, 1.2A switch limit, fixed 3.3V, no bypass mode, 6-pin WLP package | True output disconnect in shutdown (no VIN→VOUT path); higher quiescent current (1.5 µA) | Prefer when load isolation is mandatory; avoid if input-to-output continuity during sleep is required. |
Compared with TPS61200DRCT and MAX17222ETA+, the MCP1642D-33I/MS uniquely combines ultra-low start-up voltage, input-to-output bypass, integrated PG, and MSOP-8 thermal performance - making it optimal for battery-powered instrumentation requiring both long runtime and MCU supervision.
Availability
MCP1642D-33I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power systems, wireless sensor nodes, USB emergency backup chargers, and handheld instruments requiring stable component supply across industrial and consumer production cycles.
Supply support for MCP1642D-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.
The MCP1642B/D family was designed specifically for ultra-low-voltage battery-powered applications - delivering high efficiency from single-cell sources while integrating critical features like bypass shutdown and Power Good for embedded system supervision.
FAQ
What is the minimum input voltage required for the MCP1642D-33I/MS to start regulating 3.3V output?
The MCP1642D-33I/MS has a typical start-up voltage of 0.65V into a 1 mA resistive load at 3.3V output. This enables operation from nearly depleted single-cell alkaline or lithium batteries. Once started, it continues regulation down to 0.35V typical input at 1 mA load, provided source impedance remains low.
How does the input-to-output bypass mode function in the MCP1642D-33I/MS during shutdown?
When EN is pulled low, the MCP1642D-33I/MS activates its internal P-channel MOSFET to create a direct DC path from VIN to VOUT, sustaining output voltage without switching. This mode draws ≤1 µA total current and is ideal for maintaining MCU sleep-state power - unlike the MCP1642B's true disconnect mode.
Does the MCP1642D-33I/MS require external compensation components?
No. The MCP1642D-33I/MS integrates full Type II compensation, including error amplifier, slope compensation, and internal RC network. No external capacitors or resistors are needed for stable closed-loop operation - simplifying layout and reducing BOM count.
What is the purpose and behavior of the Power Good (PG) pin on the MCP1642D-33I/MS?
The PG pin is an open-drain output that goes low when VOUT falls below 90% of its nominal 3.3V value. It features 3% hysteresis, 600 µs delay after fault, and 250 µs response time. An external pull-up resistor (to VOUT or system rail) is required to interface with MCU GPIO for supply monitoring and fault recovery.
Can the MCP1642D-33I/MS drive a 500 mA load at 3.3V output from a 2.4V input?
Yes. According to characterization data, the MCP1642D-33I/MS delivers >600 mA at 3.3V output from a 2.4V input. At 2.4V input, the device operates within its 90% maximum duty cycle limit and maintains regulation with typical efficiency >92%, assuming proper layout, 4.7 µH inductor, and 10 µF ceramic output capacitance.
MCP1642D-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
MCP1642D-33I/MS FAQ
1.How can I place an order for MCP1642D-33I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-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 MCP1642D-33I/MS reliable?
The price and inventory of MCP1642D-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 MCP1642D-33I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642D-33I/MS?
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MCP1642D-33I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-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 MCP1642D-33I/MS?
For technical support, including MCP1642D-33I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-33I/MS requirements.
6.How does Aetrix verify that MCP1642D-33I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642D-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 MCP1642D-33I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642D-33I/MS?
All MCP1642D-33I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-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 MCP1642D-33I/MS part is unused and in its original packaging.
Return procedure for MCP1642D-33I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642D-33I/MS Tags
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