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Microchip Technology MCP1642B-50I/MC
- Part No.:
- MCP1642B-50I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1642B-50I/MC.pdf
- Description:
- IC REG BOOST 5V 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:403
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Product details
Overview
MCP1642B-50I/MC from Microchip Technology is a synchronous step-up DC-DC converter with true output disconnect shutdown, fixed 5.0V output, 1 MHz PWM switching, 0.65V minimum start-up voltage, and 1.8A peak input current limit. It delivers up to 1 A output current at VIN > 3.6V and is designed for single-cell Li-Ion or multi-cell alkaline/NiMH battery-powered portable electronics requiring regulated 5V rail generation.
For engineers reviewing the MCP1642B-50I/MC datasheet, MCP1642B-50I/MC pinout, MCP1642B-50I/MC application, or MCP1642B-50I/MC equivalent, key selection criteria include low-voltage start-up capability, integrated synchronous rectification, Power Good signaling, thermal shutdown behavior, and true load disconnect during shutdown - all critical for battery life and system reliability in space-constrained portable designs.
Technical Context
The MCP1642B-50I/MC implements peak-current-mode PWM control with adaptive slope compensation and an internal 1.21V reference. Its low-noise anti-ringing switch suppresses high-frequency ringing at the SW node during discontinuous conduction mode, reducing EMI without external snubbers.
True output disconnect is achieved by fully turning off both the N-channel boost switch and P-channel synchronous rectifier when EN is low, eliminating the body-diode path and ensuring <1 µA shutdown current while preserving VOUT charge. The device operates down to 0.35V input after start-up and supports output voltages up to 5.5V only when configured as adjustable - the -50 variant fixes VOUT at 5.0V via internal resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% over -40°C to +85°C ambient; enables direct USB-compatible power rail generation from low-voltage batteries. |
| Switching Frequency | 1.0 MHz typical (0.85–1.15 MHz range); allows use of small 4.7 µH inductors and compact ceramic output capacitors. |
| Start-Up Voltage | 0.65V typical at 1 mA load into 3.3V VOUT; supports operation from deeply discharged alkaline or NiMH cells. |
| Peak Switch Current Limit | 1.8A typical; sets maximum deliverable output current based on input/output voltage ratio and efficiency. |
| Shutdown Current | 1 µA max; ensures negligible battery drain during system sleep, critical for long-term portable device standby. |
| Power Good Threshold | 90% of nominal VOUT (4.5V) with 3% hysteresis; provides reliable MCU reset or sequencing signal without external monitoring circuitry. |
| Thermal Shutdown | 150°C junction temperature with 35°C hysteresis; protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch) with exposed thermal pad (EP) not electrically connected - must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable with VIN-referenced thresholds (VIH > 75% VIN, VIL < 20% VIN); no pull-up required but must not float. |
| 2 NC | No connect | Unbonded pin; must remain unconnected per datasheet - no routing or stitching allowed. |
| 3 PG | Open-drain Power Good output | Sinks ≥5 mA when VOUT drops below 4.5V; requires external pull-up to VOUT or system rail for active-low status indication. |
| 4 VOUT | Regulated 5.0V output | Connects to output capacitor and load; carries full output current; internal feedback divider tied internally for fixed-VOUT variants. |
| 5 SW | Switch node | High dv/dt node connecting inductor to internal N- and P-channel MOSFETs; peak current up to 1.8A; requires tight layout and ground return. |
| 6 PGND | Power ground | High-current return path for N-channel switch; must be connected externally to SGND and system ground with low-inductance trace. |
| 7 SGND | Signal ground | Reference for error amplifier and VFB comparator; connects externally to PGND to avoid ground bounce in regulation loop. |
| 8 VIN | Input supply | Accepts 0.35V–5.5V; requires ≥4.7 µF local ceramic bypass capacitor directly between VIN and PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | EN = low fully isolates VOUT from VIN via dual-MOSFET cutoff, preventing battery discharge through load or body diode leakage. |
| Low-noise anti-ringing control | Integrated damping circuit eliminates high-frequency oscillation at SW node during DCM, reducing radiated EMI without snubber components. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by >5% vs. asynchronous designs at medium-to-heavy loads. |
| Internal compensation | Full Type II compensation network embedded; no external RC components needed - simplifies layout and improves production yield. |
| Soft-start with controlled ramp | 550 µs typical time to 90% VOUT; prevents inrush current surge and output overshoot during enable transitions. |
Applications
| USB Emergency Backup Charger | PIC® MCU Power Supply |
|---|---|
Use Scenario: Portable battery pack converting single-cell Li-Ion (3.0–4.2V) or two alkaline cells (1.8–3.2V) to stable 5V for USB charging of smartphones or accessories. IC Role / Device Role / Timing Role: Primary regulated 5V power source with true disconnect to preserve battery charge when not actively charging. Use Value: Enables >1 A output at >90% efficiency across full battery discharge curve, extending usable runtime by minimizing conversion losses. |
Use Scenario: Powering PIC16/PIC18 microcontrollers from one or two alkaline cells in handheld medical or sensor devices. IC Role / Device Role / Timing Role: System power manager providing clean, regulated 5.0V rail with Power Good signaling for safe MCU boot and brown-out detection. Use Value: Guarantees reliable startup down to 0.65V input and maintains regulation down to 0.35V, supporting operation through deep battery depletion. |
| Wireless Sensor Node | GPS Receiver Power |
Use Scenario: Ultra-low-power IoT sensor node powered by coin cell or AA alkalines, requiring intermittent 5V bursts for RF transmission. IC Role / Device Role / Timing Role: Burst-mode power source with <1 µA shutdown current and fast 550 µs soft-start enabling rapid wake-up from deep sleep. Use Value: Extends battery life beyond 5 years in duty-cycled applications by eliminating quiescent drain and minimizing start-up energy loss. |
Use Scenario: GPS module in asset tracker or wearable requiring precise 5.0V supply with minimal noise-induced position drift. IC Role / Device Role / Timing Role: Low-EMI boost regulator supplying clean 5V rail with anti-ringing control to suppress switching noise coupling into sensitive RF front-end. Use Value: Reduces GPS acquisition time and improves positional accuracy by maintaining <10 mVpp output ripple even under dynamic load transients. |
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 | Fixed 5.0V output, 0.3V min start-up, 1.2A switch current, no true disconnect - uses diode-based bypass in shutdown. | Lacks true output isolation; outputs may backfeed during shutdown, unsuitable for systems requiring strict load decoupling. | Select when lowest possible start-up voltage is critical and output disconnect is not required. |
| Analog Devices ADP5070ARMZ-R7 | Adjustable output (1.2–15V), 2.5A switch current, 1.2 MHz, integrated LDO post-regulator, no PG pin. | Higher cost and complexity; lacks Power Good signaling and true disconnect; better suited for precision dual-rail systems. | Select when variable output or tighter output tolerance (<1%) is needed, and PG functionality is handled elsewhere. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1642B-50I/MC uniquely combines fixed 5.0V output, true output disconnect, integrated PG signaling, and sub-1 µA shutdown current in an 8-pin MSOP - making it optimal for battery-powered systems where load isolation and system-level sequencing are mandatory.
Availability
MCP1642B-50I/MC is available at Aetrix Electronics and suitable for USB emergency backup chargers, PIC® MCU power supplies, wireless sensor nodes, GPS receivers, and handheld medical instruments requiring stable component supply and long-term lifecycle support.
Supply support for MCP1642B-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, analog, FPGA, and mixed-signal semiconductor solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1642B/D family was engineered specifically for ultra-low-voltage battery-powered portable electronics, emphasizing minimal start-up voltage, high light-load efficiency, and robust protection features in compact packages.
FAQ
What is the minimum input voltage required for MCP1642B-50I/MC to start regulating 5.0V output?
The MCP1642B-50I/MC has a typical start-up voltage of 0.9V for 5.0V output at 1 mA load, with a maximum of 1.8V under worst-case conditions. This is specified in the Electrical Characteristics table for MCP1642B/D-50 variants. Once started, it continues regulation down to 0.5V input at light loads. The 0.65V figure applies only to 3.3V output versions.
Does MCP1642B-50I/MC support true output disconnect, and how does it differ from bypass mode?
Yes, MCP1642B-50I/MC implements true output disconnect: when EN is pulled low, both the N-channel boost switch and P-channel synchronous rectifier turn off completely, eliminating any DC path between VIN and VOUT. This differs from MCP1642D's input-to-output bypass mode, where the P-channel remains on to pass input voltage directly to VOUT - a feature absent in the MCP1642B-50I/MC.
Can MCP1642B-50I/MC be used with a 3.3V input to deliver 5.0V at 1A output current?
Yes, the MCP1642B-50I/MC delivers >1A output current at VIN > 3.6V and VOUT = 5.0V, as confirmed in the Features section. At 3.3V input, typical output current is ~800 mA (per datasheet Figure 2-7). For reliable 1A delivery, ensure VIN ≥ 3.6V, use low-ESR 4.7–10 µF input/output capacitors, and a 4.7 µH shielded inductor rated ≥2A.
What is the function of the NC pin (Pin 2) on MCP1642B-50I/MC, and how should it be handled on the PCB?
Pin 2 on MCP1642B-50I/MC is Not Connected (NC) - it is internally un-bonded and electrically isolated. Per Microchip's Package Types diagram and Pin Function Table, this pin must remain unconnected on the PCB: no trace, no via, no solder mask opening, and no grounding or floating. Violating this risks assembly defects or unintended coupling.
How does the Power Good (PG) pin on MCP1642B-50I/MC behave during startup and fault conditions?
The PG pin on MCP1642B-50I/MC is an open-drain output that remains high-impedance until VOUT reaches 90% of 5.0V (i.e., 4.5V), then pulls low with ≤0.4V drop at 5 mA sink current. It asserts within 600 µs of VOUT reaching threshold and responds to output dips within 250 µs. During thermal shutdown or undervoltage, PG goes high-impedance - not low - indicating loss of regulation.
MCP1642B-50I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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-DFN (2x3)
MCP1642B-50I/MC FAQ
1.How can I place an order for MCP1642B-50I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642B-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 MCP1642B-50I/MC reliable?
The price and inventory of MCP1642B-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 MCP1642B-50I/MC is usually 5 days.
3.What payment methods are accepted for MCP1642B-50I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642B-50I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642B-50I/MC?
MCP1642B-50I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642B-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 MCP1642B-50I/MC?
For technical support, including MCP1642B-50I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642B-50I/MC requirements.
6.How does Aetrix verify that MCP1642B-50I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1642B-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 MCP1642B-50I/MC meets industry standards.
7.What is the process for return or replacement of MCP1642B-50I/MC?
All MCP1642B-50I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642B-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 MCP1642B-50I/MC part is unused and in its original packaging.
Return procedure for MCP1642B-50I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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