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Microchip Technology MCP1642B-30I/MS
- Part No.:
- MCP1642B-30I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642B-30I/MS.pdf
- Description:
- IC REG BOOST 3V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,641
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Product details
Overview
MCP1642B-30I/MS from Microchip Technology is a synchronous step-up DC-DC converter with true output disconnect shutdown, fixed 3.0V output, 1 MHz PWM operation, 0.65V typical start-up voltage, and 96% peak efficiency. It delivers up to 300 mA at 1.5V input and 3.3V output, enabling power supply for PIC® MCUs and low-voltage battery-powered portable instruments.
For engineers reviewing the MCP1642B-30I/MS datasheet, MCP1642B-30I/MS pinout, MCP1642B-30I/MS application, or MCP1642B-30I/MS equivalent, key selection criteria include low-voltage start-up capability (0.65V), integrated synchronous rectification, 1 µA shutdown current, Power Good open-drain signaling, and MSOP-8 package compatibility with space-constrained handheld medical and sensor designs.
Technical Context
The MCP1642B-30I/MS implements fixed-frequency peak-current-mode PWM control with adaptive slope compensation and internal soft-start. Its architecture integrates an N-channel boost switch (RDS(ON) = 0.15 Ω) and P-channel synchronous rectifier (RDS(ON) = 0.3 Ω), enabling high efficiency across 0.35V–5.0V input range while maintaining stable regulation down to 1 mA load.
True output disconnect is enforced during shutdown by fully isolating VOUT from VIN via gate control of the internal P-channel MOSFET, eliminating leakage paths and preserving output capacitor charge. The device operates without undervoltage lockout, supporting deep battery discharge scenarios common in alkaline/NiMH-powered wireless sensors and GPS receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±3%, internally trimmed - eliminates external resistor divider and reduces BOM count and quiescent current. |
| Switching Frequency | 1.0 MHz ±15% - enables use of small 4.7 µH inductors and <10 µF ceramic output capacitors for compact PCB layout. |
| Start-Up Voltage | 0.65V typical at 3.3V VOUT, 1 mA load - supports operation from single-cell alkaline or NiMH batteries at end-of-life. |
| Peak Switch Current | 1.8A typical - sets maximum deliverable output current based on input/output voltage ratio and inductor saturation limit. |
| Shutdown Current | 1 µA max - ensures negligible battery drain during MCU sleep modes in portable medical and sensor applications. |
| Power Good Threshold | 90% of nominal VOUT with 3% hysteresis - provides reliable MCU reset or sequencing signal without external monitoring circuitry. |
| Operating Temperature | -40°C to +85°C ambient - qualified for industrial and automotive cabin-adjacent portable electronics. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), exposed thermal pad not present in MSOP variant (EP only in 2x3 DFN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable with VIN-referenced thresholds (VIH > 75% VIN, VIL < 20% VIN); must not float - requires pull-up or MCU GPIO drive. |
| 2 NC | No connect | Unbonded pad; no internal connection - leave unconnected and unpopulated on PCB. |
| 3 PG | Open-drain Power Good | Signals VOUT ≥ 90% regulation; requires external pull-up to VOUT or system rail - interfaces directly with PIC® MCU I/O pins. |
| 4 VOUT | Regulated output node | Delivers fixed 3.0V; connects to output capacitor and load - serves as reference point for internal feedback network. |
| 5 SW | Switch node | High-current path (1.8A peak) between inductor and internal N/P-channel switches - requires short, low-inductance routing. |
| 6 PGND | Power ground return | High-current return for N-channel switch - must be connected to SGND externally and tied to low-impedance ground plane. |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator - routed separately from PGND then joined at single point near IC. |
| 8 VIN | Input supply | Accepts 0.35V–5.0V; requires ≥4.7 µF local ceramic bypass capacitor - powers internal bias circuitry before startup. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | EN = low fully isolates VOUT from VIN using internal P-MOSFET gate control - prevents battery drain and preserves output hold-up in standby. |
| Synchronous Rectification | Integrated P-channel rectifier replaces external Schottky diode - eliminates 0.3–0.5V forward drop, enabling >96% efficiency at medium loads. |
| Low-Noise Anti-Ringing Control | Active damping at SW node suppresses high-frequency ringing in discontinuous conduction mode - reduces EMI and simplifies EMC filtering. |
| Internal Compensation | All loop compensation components embedded - eliminates external RC networks and guarantees stability with standard 4.7 µH inductor and 10 µF output cap. |
| Inrush Current Limiting | Hardware-limited start-up current (~125 mA) prevents output overshoot and input battery sag during cold start from weak cells. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by two AA alkaline cells with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.0V regulator delivering 25 mA to ultra-low-power analog front-end and BLE SoC during active measurement cycles. Use Value: 0.65V start-up enables operation until battery voltage drops to 0.9V per cell; 1 µA shutdown current extends shelf life beyond specification. |
Use Scenario: Battery-backed data logger using PIC16F15313 MCU in deep-sleep mode with periodic wake-up for sensor reads. IC Role / Device Role / Timing Role: Always-on 3.0V supply for MCU VDD and RTC, enabled only during active intervals via GPIO-controlled EN pin. Use Value: True output disconnect prevents backfeed into depleted battery; Power Good signal synchronizes MCU wake-up with stable VDD. |
| Hand-Held Test Instruments | Wireless Sensor Nodes |
|
Use Scenario: Pocket-sized multimeter powered by single Li-ion cell (3.0–4.2V) requiring clean 3.0V rail for precision ADC reference. IC Role / Device Role / Timing Role: Fixed-output boost converter supplying regulated 3.0V to 16-bit SAR ADC and display driver during measurement bursts. Use Value: 1 MHz switching frequency minimizes output ripple (<15 mVpp) without additional LC filtering; internal soft-start prevents display flicker at power-on. |
Use Scenario: LoRaWAN soil moisture node deployed in remote fields, powered by three AAA alkaline cells with 5-year target lifetime. IC Role / Device Role / Timing Role: Energy-harvesting-adjacent regulator providing 3.0V to sub-GHz transceiver during 100-ms transmit windows every 15 minutes. Use Value: 96% peak efficiency at 100 mA extends usable battery capacity; thermal shutdown (150°C) protects against enclosure overheating in direct sunlight. |
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 | Adjustable output (0.9–5.5V), 0.3V start-up, no true disconnect - uses external FET for load switch. | Lacks integrated true disconnect; requires external MOSFET and control logic for output isolation. | Choose when adjustable VOUT and lower start-up voltage outweigh need for integrated disconnect. |
| Analog Devices ADP5070ARMZ-R7 | Higher 2.5 MHz switching, dual-output, but 1.8V min input - no sub-1V start-up capability. | Requires ≥1.8V input; unsuitable for deeply discharged alkaline/NiMH cells below 1.2V. | Prefer for space-constrained dual-rail systems where input stays above 1.8V and higher frequency is needed. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1642B-30I/MS uniquely combines sub-1V start-up, integrated true output disconnect, fixed 3.0V output, and MSOP-8 footprint - making it optimal for cost-sensitive, battery-life-critical single-rail portable instruments.
Availability
MCP1642B-30I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power supplies, hand-held test instruments, and wireless sensor nodes requiring stable component supply with long-term lifecycle assurance.
Supply support for MCP1642B-30I/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 family was designed specifically for ultra-low-input-voltage, high-efficiency boost conversion in battery-powered portable electronics - emphasizing minimal external components, robust start-up behavior, and seamless integration with Microchip's PIC® MCU ecosystem.
FAQ
What is the minimum input voltage required for MCP1642B-30I/MS to start regulating 3.0V output?
The MCP1642B-30I/MS has a typical start-up voltage of 0.65V for 3.3V output; for its fixed 3.0V version, start-up occurs at approximately 0.60V under 1 mA resistive load. Once started, it sustains regulation down to 0.35V input at light loads. This enables operation from nearly depleted alkaline or NiMH cells, a key design feature confirmed in DS20005253A-page 3.
Does MCP1642B-30I/MS require external compensation components?
No, MCP1642B-30I/MS includes full internal compensation - all frequency compensation elements and adaptive slope compensation are integrated. The device is stable with standard 4.7 µH inductors and 10 µF ceramic output capacitors without any external RC networks, as verified in Section 4.2.9 and Figure 4-1 of the datasheet.
How does the true output disconnect function in MCP1642B-30I/MS differ from standard shutdown?
In MCP1642B-30I/MS, true output disconnect actively turns off the internal P-channel MOSFET during shutdown (EN = low), eliminating the body-diode conduction path between VIN and VOUT. This prevents reverse current flow and preserves output capacitor charge - unlike basic shutdown modes that leave a DC path. This behavior is exclusive to the "B" variant and documented in Section 4.1.1.
Can MCP1642B-30I/MS be used with a 5.0V output configuration?
No, MCP1642B-30I/MS is a fixed 3.0V output variant. The "-30" suffix explicitly denotes the 3.0V factory-trimmed option. To achieve 5.0V, the correct part is MCP1642B-50I/MS. Attempting to force 5.0V output with MCP1642B-30I/MS will result in overregulation and potential instability, as confirmed in Table 4-1 and Electrical Characteristics on DS20005253A-page 3.
What thermal performance can be expected from MCP1642B-30I/MS in MSOP-8 package?
The MSOP-8 package of MCP1642B-30I/MS has a junction-to-ambient thermal resistance (θJA) of 211°C/W. Under typical 300 mA load at 3.0V output and 1.5V input, power dissipation remains below 150 mW, resulting in <32°C junction rise above ambient - well within the -40°C to +125°C operating junction range specified in DS20005253A-page 5.
MCP1642B-30I/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):
- 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-30I/MS FAQ
1.How can I place an order for MCP1642B-30I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-30I/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-30I/MS reliable?
The price and inventory of MCP1642B-30I/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-30I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642B-30I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-30I/MS transactions.
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4.How is shipping managed for MCP1642B-30I/MS?
MCP1642B-30I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-30I/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-30I/MS?
For technical support, including MCP1642B-30I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-30I/MS requirements.
6.How does Aetrix verify that MCP1642B-30I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642B-30I/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-30I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642B-30I/MS?
All MCP1642B-30I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-30I/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-30I/MS part is unused and in its original packaging.
Return procedure for MCP1642B-30I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1642B-30I/MS Tags
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