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Microchip Technology MCP1642D-ADJI/MS
- Part No.:
- MCP1642D-ADJI/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642D-ADJI/MS.pdf
- Description:
- IC REG BOOST ADJ 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
MCP1642D-ADJI/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-input-voltage battery-powered systems. It delivers up to 800 mA output at 5.0 V from 3.3 V input, features 1.21 V feedback reference, 1 MHz fixed-frequency PWM operation, and Input-to-Output Bypass shutdown mode. It enables regulated power in single-cell Li-Ion, alkaline, or NiMH portable medical sensors and wireless instrumentation.
For engineers reviewing the MCP1642D-ADJI/MS datasheet, MCP1642D-ADJI/MS pinout, MCP1642D-ADJI/MS application, or MCP1642D-ADJI/MS equivalent, key selection criteria include low-startup voltage (0.65 V typical), adjustable 1.8–5.5 V output, integrated synchronous rectification, 1 µA shutdown current, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MCP1642D-ADJI/MS implements peak-current-mode control with adaptive slope compensation, enabling stable operation across wide VIN/VOUT ratios. Its dual-MOSFET synchronous architecture integrates a 0.15 Ω N-Channel boost switch and 0.3 Ω P-Channel rectifier, eliminating external diode losses and supporting >96% efficiency at mid-load.
Startup logic initiates conduction from as low as 0.65 V input using open-loop charge-pump-like pre-charge of VOUT, then transitions to closed-loop PWM once regulation is achieved. The Input-to-Output Bypass shutdown mode maintains a direct VIN-to-VOUT path via the internal P-Channel MOSFET while drawing <1 µA, enabling MCU sleep-mode operation without output discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.35 V to 5.5 V - supports deep-discharged alkaline/Li-Ion cells; no UVLO disables operation down to minimum bias threshold |
| Output Voltage Range | 1.8 V to 5.5 V (adjustable) - set by external resistor divider; VFB = 1.21 V ±3% ensures ±3% output accuracy over temperature |
| Switching Frequency | 1.0 MHz ±15% - fixed-frequency PWM enables predictable EMI filtering and compact 4.7 µH inductor selection |
| Peak Switch Current Limit | 1.8 A typical - defines maximum deliverable output current under boost ratio constraints (e.g., 800 mA @ 3.3 VIN/5.0 VOUT) |
| Shutdown Current | 1 µA max - enables multi-year battery life in always-on sensor nodes; bypass mode preserves VOUT during EN = low |
| Power Good Threshold | 90% of nominal VOUT - open-drain PG asserts low when output drops below regulation window, enabling MCU fault detection |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and portable medical environments; thermal shutdown at 150°C with 35°C hysteresis |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), exposed pad not electrically connected - requires external SGND/PGND tie to PCB thermal plane for thermal performance (θJA = 211°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable control input | Logic-level input; enables switching when >75% of VIN, disables with <20% of VIN; must not float |
| 2 NC | No-connect terminal | Unbonded pad; left unconnected per datasheet - no internal circuitry attached |
| 3 PG | Open-drain Power Good output | Asserts low when VOUT falls below 90% of target; requires external pull-up to VOUT or system rail |
| 4 VOUT | Regulated output node | Connects to output capacitor and external feedback divider; carries full load current and high-frequency ripple |
| 5 SW | Switch node | High-current connection point for boost inductor; sees 1.8 A peak current and fast dV/dt transients |
| 6 PGND | Power ground return | Low-impedance return path for N-Channel switch; must be tied externally to SGND near device |
| 7 SGND | Signal ground reference | Reference for error amplifier and VFB comparator; routed separately from PGND then joined at single point |
| 8 VIN | Input supply connection | Accepts 0.35–5.5 V input; requires ≥4.7 µF local ceramic decoupling to PGND |
Key Features
| Feature | Design Value |
|---|---|
| Input-to-Output Bypass Shutdown | EN = low connects VIN directly to VOUT via internal P-Channel MOSFET, enabling zero-power MCU sleep while preserving output voltage |
| Low Start-Up Voltage | 0.65 V typical start-up into 1 mA load at 3.3 V output - allows operation from nearly depleted single-cell batteries |
| Synchronous Rectification | Integrated 0.3 Ω P-Channel rectifier eliminates Schottky loss, enabling >96% efficiency and reducing thermal load vs. external diode solutions |
| Internal Compensation | Full Type-II compensation network embedded - eliminates external capacitor/resistor, reduces BOM count and layout sensitivity |
| Anti-Ringing Switch Control | Active damping of SW node oscillations in DCM - suppresses high-frequency radiated noise without snubber components |
| Thermal Protection | Auto-restart thermal shutdown at 150°C with 35°C hysteresis - prevents latch-up during overload or poor heatsinking |
Applications
| Wireless Sensor Node | PIC® MCU Power Supply |
|---|---|
Use Scenario: Battery-powered environmental sensor transmitting data via BLE or LoRaWAN every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3 V regulator stepping up from 1.2–2.4 V alkaline cell stack; provides stable rail during RF transmit bursts. Use Value: 0.35 V minimum operating input extends usable battery life by >30% versus competing boost ICs; 1 µA shutdown current enables multi-year operation on AA cells. |
Use Scenario: PIC16F15313 microcontroller powered from single 1.5 V alkaline cell in handheld test instrument. IC Role / Device Role / Timing Role: Adjustable-output boost supplying 3.3 V to MCU core and peripherals; PG signal triggers firmware low-VOUT alert. Use Value: 1.21 V precise VFB reference ensures ±3% output accuracy across –40°C to +85°C, maintaining reliable MCU clock and ADC performance. |
| USB Emergency Backup Charger | Portable Medical Glucose Monitor |
Use Scenario: Hand-crank or solar-charged power bank delivering 5.0 V USB output from 1.8–3.6 V LiFePO₄ or NiMH pack. IC Role / Device Role / Timing Role: Fixed 5.0 V boost stage; Input-to-Output Bypass mode supplies unregulated input directly to USB port during cranking, then switches to regulated output when voltage rises. Use Value: Seamless transition between bypass and boost modes avoids USB enumeration reset; 1 MHz switching enables small 4.7 µH inductor and minimal footprint. |
Use Scenario: Pocket-sized glucose meter using AAA alkaline cells, requiring stable 3.0 V for electrochemical sensor and LCD backlight. IC Role / Device Role / Timing Role: Adjustable boost configured for 3.0 V output; soft-start limits inrush during power-on to avoid sensor offset drift. Use Value: 550 µs soft-start time prevents transient-induced measurement errors; low-noise anti-ringing control minimizes interference with analog front-end signals. |
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 | 0.3 V start-up, 1.2 A switch, no integrated bypass mode; requires external PFET for true disconnect or bypass | Lacks native Input-to-Output Bypass; suitable where full shutdown is preferred over VIN pass-through | Choose TPS61200DRCT if lower start-up voltage (<0.35 V) is critical and external FET layout is acceptable |
| Analog Devices ADP5070ACPZ-R7 | 2.5 V min input, 1.2 A switch, fixed 1.2 MHz, no low-VIN capability; includes LDO post-regulator | Not viable for sub-1.0 V battery inputs; targets higher-VIN industrial rails, not primary battery conversion | Choose ADP5070ACPZ-R7 only for systems with stable >2.5 V input and need for ultra-low-noise LDO output |
Compared with TPS61200DRCT and ADP5070ACPZ-R7, the MCP1642D-ADJI/MS uniquely combines sub-0.7 V start-up, integrated Input-to-Output Bypass, and MSOP-8 packaging - making it the only option that delivers both ultra-low-VIN operation and seamless sleep-mode power retention without external components.
Availability
MCP1642D-ADJI/MS is available at Aetrix Electronics and suitable for wireless sensors, portable medical devices, and PIC® MCU power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MCP1642D-ADJI/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, and power management ICs for embedded control applications.
The MCP1642B/D family was designed specifically for ultra-low-input-voltage battery-powered systems - targeting portable instrumentation, medical sensors, and energy-harvesting devices where extended runtime from single-cell alkaline or Li-Ion sources is essential.
FAQ
What is the minimum input voltage required for MCP1642D-ADJI/MS to start regulating 3.3 V output?
The MCP1642D-ADJI/MS starts regulating a 3.3 V output at 0.65 V typical input voltage with a 1 mA resistive load. This low start-up threshold enables operation from deeply discharged single-cell alkaline or NiMH batteries. Below this voltage, the device remains inactive but draws no significant current. The 0.35 V minimum operating input applies only after regulation has been established.
How does the Input-to-Output Bypass mode function in MCP1642D-ADJI/MS during shutdown?
In Input-to-Output Bypass mode, pulling EN low activates the internal P-Channel MOSFET to directly connect VIN to VOUT, allowing unregulated input voltage to pass through while consuming <1 µA. This preserves output voltage for sleeping MCUs without discharging the output capacitor. Unlike true disconnect (MCP1642B), MCP1642D-ADJI/MS maintains this path until EN is reasserted high.
Can MCP1642D-ADJI/MS be used with a fixed 3.3 V output without external resistors?
No - MCP1642D-ADJI/MS is the adjustable version and requires an external resistor divider connected between VOUT, VFB, and GND to set the output voltage. For fixed 3.3 V output, Microchip offers the pin-compatible MCP1642D-33I/MS, which contains an internal feedback divider and leaves VFB unconnected. Using MCP1642D-ADJI/MS without the divider results in undefined output voltage.
What is the purpose of the NC pin (Pin 2) on MCP1642D-ADJI/MS?
Pin 2 on MCP1642D-ADJI/MS is Not Connected (NC) - it is an unbonded pad with no internal electrical connection. It must remain floating and unconnected on the PCB. This differs from the fixed-output variants (e.g., MCP1642D-33I/MS), where Pin 2 is also NC but serves the same mechanical role in the MSOP-8 package footprint.
Does MCP1642D-ADJI/MS require external compensation components?
No - MCP1642D-ADJI/MS includes fully integrated Type-II compensation. All necessary capacitors and resistors for loop stability are embedded within the die, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and improves consistency across manufacturing lots compared to controllers requiring external compensation.
MCP1642D-ADJI/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.65V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- 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-ADJI/MS FAQ
1.How can I place an order for MCP1642D-ADJI/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642D-ADJI/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-ADJI/MS reliable?
The price and inventory of MCP1642D-ADJI/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-ADJI/MS is usually 5 days.
3.What payment methods are accepted for MCP1642D-ADJI/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642D-ADJI/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642D-ADJI/MS?
MCP1642D-ADJI/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642D-ADJI/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-ADJI/MS?
For technical support, including MCP1642D-ADJI/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642D-ADJI/MS requirements.
6.How does Aetrix verify that MCP1642D-ADJI/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642D-ADJI/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-ADJI/MS meets industry standards.
7.What is the process for return or replacement of MCP1642D-ADJI/MS?
All MCP1642D-ADJI/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642D-ADJI/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-ADJI/MS part is unused and in its original packaging.
Return procedure for MCP1642D-ADJI/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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