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Microchip Technology MCP1642B-50I/MS
- Part No.:
- MCP1642B-50I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642B-50I/MS.pdf
- Description:
- IC REG BOOST 5V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
MCP1642B-50I/MS 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 with 1.8A peak switch current, 1 MHz fixed-frequency PWM operation, and true output disconnect during shutdown. It enables compact, high-efficiency power for PIC® MCU supply rails, USB backup chargers, and wireless sensors operating under deep-discharge alkaline or Li-ion conditions.
For engineers reviewing the MCP1642B-50I/MS datasheet, MCP1642B-50I/MS pinout, MCP1642B-50I/MS application, or MCP1642B-50I/MS equivalent, key selection criteria include verified 0.65V start-up voltage at 3.3V output, ±3% output voltage accuracy over –40°C to +85°C, integrated 0.15Ω NMOS and 0.3Ω PMOS switches, 1 µA shutdown current, and MSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The MCP1642B-50I/MS implements peak-current-mode control with adaptive slope compensation, fixed 1 MHz switching frequency, and internal soft-start ramping the 1.8A current limit over 550 µs. Its low-noise anti-ringing circuit suppresses switch-node oscillations in discontinuous conduction mode, while the true output disconnect architecture breaks the VIN–VOUT DC path when EN is low-preventing battery drain and output discharge.
Start-up begins at 0.65V (typical) into a 1 mA resistive load at 3.3V output, and sustains regulation down to 0.5V input (typical) at 5.0V output. The device draws bias from VIN initially, then transitions to VOUT once regulated-enabling stable operation even as input voltage decays below output level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over –40°C to +85°C; no external resistor divider required. |
| Input Voltage Range | 0.5V minimum operating input (typical), 0.9V minimum start-up (typical) for 5.0V output; max input ≤ VOUT (i.e., ≤5.0V). |
| Switching Frequency | 1.0 MHz ±15%; fixed-frequency PWM ensures predictable EMI profile and low output ripple. |
| Peak Switch Current | 1.8A typical; supports ≥1A output at VIN > 3.6V → 5.0V conversion with high efficiency. |
| Shutdown Current | 1 µA maximum; enables ultra-low-power standby in battery-critical applications. |
| Feedback Reference | 1.21V ±2.5% (VFB); used internally for fixed 5.0V regulation-no external connection needed. |
| Power Good Output | Open-drain PG asserts low when VOUT falls <90% of nominal (i.e., <4.5V); 600 µs delay ensures stable regulation before assertion. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), lead-free, RoHS-compliant. Exposed thermal pad not present in MSOP variant (only in 2x3 DFN).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; requires >75% of VIN to activate; <20% of VIN to disable; must not float. |
| 2 NC | No connect | Unbonded pin; left unconnected on PCB; no electrical function. |
| 3 PG | Open-drain Power Good | Sinks current when VOUT < 4.5V; requires external pull-up to VOUT or system rail for MCU interface. |
| 4 VOUT | Regulated output node | Delivers 5.0V; connects to output capacitor and load; internal feedback divider tied to this pin. |
| 5 SW | Switch node | Connects boost inductor between VIN and SW; carries up to 1.8A peak current; internal NMOS drain/PMOS source junction. |
| 6 PGND | Power ground return | High-current return path for NMOS switch; must be connected to SGND externally on PCB. |
| 7 SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator; tied to PGND externally. |
| 8 VIN | Input supply | Accepts 0.5V–5.0V; requires ≥4.7 µF local ceramic bypass capacitor to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | MCP1642B-50I/MS isolates VOUT from VIN during shutdown-eliminating leakage paths and preserving output capacitor charge. |
| Low-voltage start-up | Starts reliably at 0.9V input (typical) for 5.0V output, enabling use with deeply discharged alkaline or Li-ion cells. |
| Synchronous rectification | Integrated 0.15Ω NMOS boost switch + 0.3Ω PMOS rectifier eliminates external Schottky loss and improves light-load efficiency. |
| Internal compensation | Full Type II compensation network embedded-no external capacitors or resistors needed for stability across all loads. |
| Anti-ringing control | Actively damps switch-node ringing in DCM, reducing radiated EMI without snubbers or layout compromises. |
Applications
| Portable Medical Sensors | PIC® MCU Power Supply |
|---|---|
|
Use Scenario: Battery-powered glucose meter or pulse oximeter requiring stable 5.0V rail from single AA/AAA cell. IC Role / Device Role / Timing Role: Primary step-up regulator providing regulated 5.0V to analog front-end and microcontroller during full discharge cycle (0.9V–1.6V input). Use Value: Enables continuous operation down to 0.5V input-extending usable battery life by >25% versus conventional boost ICs with higher UVLO. |
Use Scenario: PIC16F/LF series MCU in handheld test equipment needing clean 5.0V supply from 1.5V alkaline cell. IC Role / Device Role / Timing Role: System power manager delivering 5.0V with Power Good signaling to coordinate MCU wake-up and peripheral initialization. Use Value: PG output provides deterministic reset timing; 1 µA shutdown current preserves battery for months in sleep mode. |
| USB Emergency Backup Charger | Wireless Sensor Node |
|
Use Scenario: Portable power bank using single Li-ion cell to deliver 5.0V/500mA USB output. IC Role / Device Role / Timing Role: High-efficiency boost stage converting 3.0V–4.2V battery to regulated 5.0V; handles dynamic load steps up to 1A. Use Value: 96% peak efficiency at 3.6V→5.0V/500mA reduces thermal stress and extends charge cycles per battery charge. |
Use Scenario: LoRaWAN sensor node powered by two alkaline cells, transmitting 5.0V pulses to RF transceiver. IC Role / Device Role / Timing Role: Burst-mode power source enabling 5.0V RF transmit bursts while maintaining <1 µA quiescent draw between transmissions. Use Value: True disconnect prevents VOUT capacitor discharge during sleep-ensuring immediate 5.0V availability at next transmit event. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1642D-50I/MS | Shares identical electrical specs but uses Input-to-Output Bypass shutdown instead of True Disconnect; PGND/SGND pinout identical. | Provides VIN→VOUT pass-through during shutdown-suitable when load can tolerate unregulated input voltage. | Select MCP1642D-50I/MS only if system requires input bypass (e.g., MCU sleep mode with direct battery feed); otherwise MCP1642B-50I/MS is preferred for isolation-critical designs. |
| TPS61200DRCT | Fixed 5.0V output, 0.3V min start-up, 1.2A switch current, 500 kHz switching; no true disconnect; different pinout (QFN-10). | Lacks output isolation in shutdown; lower peak current limits max output at high boost ratios. | Choose TPS61200DRCT only if board space allows QFN-10 and application tolerates ~0.5V higher minimum input voltage and no VOUT hold-up during shutdown. |
Compared with MCP1642D-50I/MS and TPS61200DRCT, the MCP1642B-50I/MS uniquely combines sub-1V start-up, true output disconnect, and MSOP-8 footprint-making it optimal for space-constrained, battery-life-sensitive portable instruments where output rail integrity during standby is mandatory.
Availability
MCP1642B-50I/MS is available at Aetrix Electronics and suitable for portable medical sensors, PIC® MCU power supplies, USB emergency backup chargers, and wireless sensor nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1642B-50I/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 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-voltage, high-efficiency boost conversion in single-cell battery systems-targeting portable instrumentation, medical wearables, and energy-harvesting edge nodes where start-up voltage and shutdown leakage are critical.
FAQ
What is the minimum input voltage required for MCP1642B-50I/MS to start regulating 5.0V output?
The MCP1642B-50I/MS starts regulating 5.0V output at a typical input voltage of 0.9V with a 1 mA resistive load, as confirmed in the Electrical Characteristics table (Note 1, DS20005253A-page 3). This low start-up threshold enables operation with deeply discharged alkaline or Li-ion cells that fall below 1.0V, distinguishing it from most competing boost regulators.
Does MCP1642B-50I/MS require external feedback resistors to set its 5.0V output?
No. The MCP1642B-50I/MS is a fixed-output variant with an internal resistor divider calibrated to deliver 5.0V ±3%. Pin 2 (VFB) is unconnected (NC) on this part-no external components are needed for regulation, simplifying layout and reducing BOM count versus adjustable versions like MCP1642B-ADJ.
How does the true output disconnect feature of MCP1642B-50I/MS benefit battery-powered systems?
When EN is pulled low, the MCP1642B-50I/MS turns off both internal MOSFETs and breaks the DC path between VIN and VOUT-preventing battery drain through load leakage or output capacitor discharge. This maintains VOUT voltage for rapid wake-up and extends shelf life, especially critical in medical sensors and remote IoT nodes where standby current must stay below 1 µA.
Can MCP1642B-50I/MS operate with input voltage higher than 5.0V?
No. The Absolute Maximum Ratings specify that VIN must not exceed +6.5V relative to GND, but the functional constraint states "Maximum Input Voltage ≤ VOUT < 5.5V" (DS20005253A-page 1). Since MCP1642B-50I/MS is a fixed 5.0V device, VIN must remain ≤5.0V to maintain regulation-exceeding this risks loss of control and potential damage.
What is the purpose of the NC pin (Pin 2) on the MCP1642B-50I/MS MSOP package?
Pin 2 on the MCP1642B-50I/MS is designated NC (No Connect) and is electrically unconnected-no bond wire attaches to it. It must remain unconnected on the PCB. This pin is reserved for the adjustable version (MCP1642B-ADJ), where it serves as the VFB input; for fixed-output variants like MCP1642B-50I/MS, VFB is internally routed and inaccessible.
MCP1642B-50I/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):
- 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-MSOP
MCP1642B-50I/MS FAQ
1.How can I place an order for MCP1642B-50I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-50I/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-50I/MS reliable?
The price and inventory of MCP1642B-50I/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-50I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642B-50I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-50I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642B-50I/MS?
MCP1642B-50I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-50I/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-50I/MS?
For technical support, including MCP1642B-50I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-50I/MS requirements.
6.How does Aetrix verify that MCP1642B-50I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642B-50I/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-50I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642B-50I/MS?
All MCP1642B-50I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-50I/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-50I/MS part is unused and in its original packaging.
Return procedure for MCP1642B-50I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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