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Microchip Technology MCP1642DT-18I/MS
- Part No.:
- MCP1642DT-18I/MS
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1642DT-18I/MS.pdf
- Description:
- IC REG BOOST 1.8V 800MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,058
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Product details
Overview
MCP1642DT-18I/MS from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It delivers 1.8V fixed output from inputs as low as 0.65V start-up voltage and 0.35V operating voltage, supports up to 1.8A peak switch current, operates at 1 MHz PWM frequency, and integrates true output disconnect shutdown with <1 µA quiescent current - enabling long runtime in single-cell alkaline or Li-Ion portable medical sensors and wireless instrumentation.
For engineers reviewing the MCP1642DT-18I/MS datasheet, MCP1642DT-18I/MS pinout, MCP1642DT-18I/MS application, or MCP1642DT-18I/MS equivalent, key selection criteria include verified low-voltage start-up capability, confirmed 1.8V fixed-output accuracy (±3%), validated thermal shutdown behavior at 150°C, and documented input-to-output isolation during shutdown - all critical for energy-constrained embedded power rails.
Technical Context
The MCP1642DT-18I/MS implements a fixed-frequency peak-current-mode PWM controller with adaptive slope compensation and integrated N-Channel boost switch (RDS(ON) = 0.15 Ω) and P-Channel synchronous rectifier (RDS(ON) = 0.3 Ω). Its low-noise anti-ringing control suppresses switch-node oscillations during discontinuous conduction mode, reducing EMI without external snubbers.
Startup uses a ring oscillator followed by RC-based closed-loop regulation; soft-start ramps the 1.8A current limit over 550 µs. The device lacks undervoltage lockout and operates down to 0.35V input at light load, making it suitable for deeply discharged battery scenarios where "motor-boating" must be managed externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±3% - internally trimmed; no external feedback resistors required. |
| Start-Up Voltage | 0.65V typical @ 1 mA load - enables operation from near-dead single-cell batteries. |
| Operating Input Range | 0.35V to <VOUT (i.e., <1.8V) - supports ultra-low-VIN operation after startup. |
| Switching Frequency | 1.0 MHz ±15% - enables compact 4.7 µH inductor and low-profile 4.7–10 µF ceramic capacitors. |
| Peak Switch Current | 1.8A typical - sets maximum deliverable output current based on VIN/VOUT ratio and efficiency. |
| Shutdown Current | <1 µA - achieved via true output disconnect; eliminates battery drain during system sleep. |
| Power Good Threshold | 90% of nominal VOUT (1.62V) with 3% hysteresis - provides reliable MCU reset signaling. |
Pinout & Package
Package: 8-Lead MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), with exposed thermal pad (EP) not present in MSOP variant per DS20005253A-page 13 - EP is only included in the 2x3 DFN package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable logic input | Active-high enable; threshold = 75% of VIN - ensures robust noise immunity across input voltage range. |
| 2 NC | No-connect terminal | Unbonded pin; must remain floating - no internal connection or function. |
| 3 PG | Open-drain Power Good output | Sinks ≥5 mA when VOUT drops below 1.62V; requires external pull-up to VOUT or system rail. |
| 4 VOUT | Regulated output node | Delivers 1.8V fixed output; connects to output capacitor and load; internal feedback divider tied internally. |
| 5 SW | Switch node | Connects to inductor; carries up to 1.8A peak current; high dv/dt node requiring careful PCB layout. |
| 6 PGND | Power ground return | High-current return path for N-Channel switch; must be short, low-impedance trace to CIN ground. |
| 7 SGND | Signal ground reference | Low-noise reference for error amplifier and VFB comparator; connect externally to PGND at single point. |
| 8 VIN | Input supply | Accepts 0.35–1.8V input; requires ≥4.7 µF local ceramic bypass capacitor to PGND/SGND. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect shutdown | EN = low removes DC path between VIN and VOUT - prevents battery discharge into load capacitance. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency >90% at mid-load. |
| Low-noise anti-ringing control | Damps switch-node ringing in DCM without snubber components - lowers radiated EMI in sensitive RF layouts. |
| Internal compensation | Full Type II compensation network embedded - no external capacitors or resistors needed for stability. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature; auto-restarts at 115°C - protects against sustained overload. |
Applications
| Medical Sensor Node | Wireless Instrumentation |
|---|---|
|
Use Scenario: Single-cell alkaline-powered glucose monitor with BLE radio and analog front-end. IC Role / Device Role / Timing Role: Primary 1.8V supply for ADC, microcontroller core, and BLE transceiver during active measurement cycles. Use Value: 0.65V start-up enables operation until battery reaches 0.8V, extending usable life by ~18% versus 0.9V-start competitors. |
Use Scenario: Handheld multimeter using one AA cell to power LCD, precision op-amps, and SAR ADC. IC Role / Device Role / Timing Role: Fixed 1.8V rail for digital logic and reference buffers; isolated during sleep via EN control. Use Value: True disconnect cuts standby current to <1 µA, enabling >2-year shelf life without battery removal. |
| PIC® MCU Power Supply | GPS Receiver Backup Rail |
|
Use Scenario: PIC16LF18326-based environmental logger powered by single NiMH cell (0.9–1.4V). IC Role / Device Role / Timing Role: Dedicated 1.8V core voltage source; synchronized with MCU wake-up via EN pin. Use Value: Internal 1.21V reference and ±3% VOUT accuracy ensure stable brown-out detection and flash programming margins. |
Use Scenario: GPS module requiring 1.8V backup rail during main power loss, sourced from coin cell. IC Role / Device Role / Timing Role: Always-on low-quiescent boost converter maintaining RTC and ephemeris memory. Use Value: 0.35V operating minimum allows >95% coin cell capacity utilization before cutoff. |
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 TPS61291DRVR | 0.7V start-up; 1.8V fixed output; 1.2A peak switch; no true disconnect - only high-Z output in shutdown. | Lacks output isolation; draws ~100 nA shutdown current but allows VOUT leakage through body diode. | Select when lower start-up voltage is prioritized over battery isolation; verify load capacitance discharge path. |
| Analog Devices ADP5070ARMZ-R7 | Adjustable output (1.2–5.5V); 2.5A peak switch; 1.2 MHz; requires external feedback resistors and compensation. | Higher current capability but larger solution size and design complexity; no integrated soft-start ramp control. | Select when adjustable VOUT or >1A output is required; accept added BOM count and layout sensitivity. |
Compared with TPS61291DRVR and ADP5070ARMZ-R7, the MCP1642DT-18I/MS uniquely combines guaranteed 0.65V start-up, true output disconnect, fixed 1.8V accuracy, and full internal compensation - delivering lowest-risk implementation for space-constrained, battery-life-critical 1.8V rails.
Availability
MCP1642DT-18I/MS is available at Aetrix Electronics and suitable for portable medical sensors, wireless instrumentation, PIC® MCU power supplies, GPS receiver backup rails, and handheld test equipment requiring stable component supply across extended production lifecycles.
Supply support for MCP1642DT-18I/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.
The MCP1642B/D product line was designed specifically for ultra-low-input-voltage boost conversion in single- and multi-cell battery systems - emphasizing minimal quiescent current, robust start-up from depleted cells, and seamless integration with Microchip's PIC® and AVR® microcontrollers.
FAQ
What is the minimum input voltage required for MCP1642DT-18I/MS to start regulating 1.8V output?
The MCP1642DT-18I/MS starts regulation at 0.65V typical input voltage with a 1 mA resistive load, as specified in the Electrical Characteristics table. This value is measured under standardized conditions (CIN = COUT = 10 µF, L = 4.7 µH, TA = +25°C) and applies specifically to the MCP1642DT-18I/MS fixed 1.8V variant. Below this threshold, the device remains in pre-regulation charge phase.
Does MCP1642DT-18I/MS require external feedback resistors to set its 1.8V output?
No, the MCP1642DT-18I/MS does not require external feedback resistors. It uses an internal resistor divider to fix the output at 1.8V, with pin 2 (VFB) left unconnected (NC) per the Pin Function Table. This eliminates component count and layout sensitivity while maintaining ±3% output accuracy over temperature and load.
How does the true output disconnect feature operate in MCP1642DT-18I/MS during shutdown?
When EN is pulled low, the MCP1642DT-18I/MS turns off both the N-Channel boost switch and the P-Channel synchronous rectifier, breaking the DC path between VIN and VOUT. This isolates the output capacitor from the input source, preventing battery discharge through load capacitance - a behavior confirmed in Section 4.1.1 and validated in the shutdown current specification of <1 µA.
What is the purpose of the NC pin (Pin 2) on the MCP1642DT-18I/MS MSOP package?
Pin 2 on the MCP1642DT-18I/MS is designated NC (No Connect) and is physically unbonded - it has no internal electrical connection. Per DS20005253A-page 13, this pin must remain floating and should not be tied to any net, including ground or supply, to avoid unintended coupling or mechanical stress on the die bond wire.
Can MCP1642DT-18I/MS operate with input voltages higher than 1.8V?
No, the MCP1642DT-18I/MS is not rated for input voltages exceeding its output voltage. Per Absolute Maximum Ratings and Section 1.0, maximum input voltage is limited to ≤VOUT (<1.8V) to prevent damage to the internal P-Channel rectifier and ensure proper regulation. Applying VIN ≥ VOUT risks uncontrolled conduction and potential device failure.
MCP1642DT-18I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 1.8V
- 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
MCP1642DT-18I/MS FAQ
1.How can I place an order for MCP1642DT-18I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1642DT-18I/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 MCP1642DT-18I/MS reliable?
The price and inventory of MCP1642DT-18I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1642DT-18I/MS is usually 5 days.
3.What payment methods are accepted for MCP1642DT-18I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1642DT-18I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1642DT-18I/MS?
MCP1642DT-18I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1642DT-18I/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 MCP1642DT-18I/MS?
For technical support, including MCP1642DT-18I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1642DT-18I/MS requirements.
6.How does Aetrix verify that MCP1642DT-18I/MS is sourced from the original manufacturer or authorized distributors?
All MCP1642DT-18I/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 MCP1642DT-18I/MS meets industry standards.
7.What is the process for return or replacement of MCP1642DT-18I/MS?
All MCP1642DT-18I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1642DT-18I/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 MCP1642DT-18I/MS part is unused and in its original packaging.
Return procedure for MCP1642DT-18I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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