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Microchip Technology MCP1640D-I/MC
- Part No.:
- MCP1640D-I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1640D-I/MC.pdf
- Description:
- IC REG BOOST ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
MCP1640D-I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It delivers up to 350 mA output at 5.0 V from 3.3 V input, starts reliably at 0.65 V (typical), operates down to 0.35 V input, supports adjustable 2.0–5.5 V output, and features PWM-only mode with fixed 500 kHz switching - ideal for Li-ion coin-cell or single-cell alkaline portable sensors.
For engineers reviewing the MCP1640D-I/MC datasheet, MCP1640D-I/MC pinout, MCP1640D-I/MC application, or MCP1640D-I/MC equivalent, this page provides verified functional identity, validated package mapping (8-Lead 2×3 mm DFN), confirmed pin roles, real-world efficiency curves, true load disconnect vs. bypass mode distinctions, and cross-referenced alternatives for low-power boost supply design.
Technical Context
The MCP1640D-I/MC implements fixed-frequency PWM-only operation without PFM mode, ensuring stable 500 kHz switching across all loads - eliminating variable-frequency ripple seen in PFM variants. Its internal synchronous rectifier uses an integrated P-channel MOSFET with 0.9 Ω typical RDS(ON), enabling true input-to-output bypass during shutdown with <1 µA quiescent current.
Start-up logic initiates from as low as 0.65 V input using internal charge-pump-assisted biasing, then transitions to closed-loop control once output reaches 1.6 V. The device integrates slope-compensated peak-current-mode control with 850 mA typical peak switch current limit and built-in overtemperature protection (150°C trip, 10°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V typical - enables reliable boot from deeply discharged alkaline or Li coin cells without external assist circuitry |
| Operating Input Range | 0.35 V to ≤ VOUT (max 5.5 V) - supports full discharge of single-cell batteries while maintaining regulation |
| Switching Frequency | 500 kHz ±75 kHz - fixed PWM-only operation ensures predictable EMI filtering and consistent output ripple |
| Peak Switch Current Limit | 850 mA typical - sets maximum deliverable power; determines max IOUT (e.g., 350 mA @ 3.3 VIN/5.0 VOUT) |
| Quiescent Current (PWM) | 220 µA typical - measured at VOUT = 4.0 V, no load; defines minimum system standby power overhead |
| Feedback Reference Voltage | 1.21 V ±0.035 V - precision reference used with external resistor divider to set output voltage from 2.0 V to 5.5 V |
| Shutdown Current | 0.7–2.3 µA - includes N- and P-channel leakage; enables multi-year battery life in always-off states |
Pinout & Package
Package: 8-Lead 2 × 3 mm DFN with exposed thermal pad (EP); EP must be connected to SGND/PGND on PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 0.35–5.5 V; requires ≥4.7 µF local decoupling; feeds internal bias and boost switch |
| VFB | Feedback sense input | Monitors resistor-divider output; regulates VOUT to 1.21 V reference; 10 pA bias current minimizes divider error |
| EN | Enable control input | Logic-level active-high: >90% VIN enables, <20% VIN disables; supports battery-aware system wake/sleep sequencing |
| SW | Switch node | Connects to inductor; carries up to 800 mA peak current; internal N-channel drain + P-channel source junction |
| VOUTP | Output power delivery | High-current path from P-channel source to output capacitor and load; shares net with VOUTS externally in DFN |
| VOUTS | Output voltage sensing | Provides regulated feedback path to internal error amplifier; tied to VOUTP on PCB in DFN package |
| PGND | Power ground return | Low-impedance return for high di/dt switch current; must be short-traced to VIN and CIN ground |
| SGND | Signal ground reference | Return for internal reference and error amplifier; externally connected to PGND in DFN layout |
| EP | Exposed thermal pad | No internal connection; must be soldered to PCB copper pour tied to SGND/PGND for thermal dissipation (θJA = 75°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Input-to-output bypass mode | EN = low connects VIN directly to VOUT via integrated 0.9 Ω P-channel MOSFET - enables deep-sleep bias for downstream circuits |
| True low-voltage start-up | 0.65 V typical start with 1 mA load at 3.3 VOUT - eliminates need for auxiliary start-up circuitry in energy-harvesting or coin-cell designs |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ~5–8% vs. asynchronous boost |
| Internal slope compensation | Adaptive to VIN/VOUT ratio - ensures stable peak-current-mode control across full operating range without external components |
| Anti-ringing switch control | Damps high-frequency oscillations at SW node in discontinuous conduction mode - lowers radiated EMI and simplifies EMC filtering |
Applications
| Wireless Sensor Node | Medical Wearable |
|---|---|
|
Use Scenario: Sub-100 µA average current BLE sensor node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 3.3 V rail generator; enables MCU, radio, and analog front-end from 2.0–3.0 V battery range. Use Value: 0.65 V start-up and 0.35 V operating minimum extend usable battery life by >30% versus conventional boosters. |
Use Scenario: Disposable glucose monitor with single AAA alkaline cell and 5.0 V LCD backlight. IC Role / Device Role / Timing Role: Adjustable 5.0 V output booster; supplies backlight and analog signal chain during brief measurement bursts. Use Value: PWM-only 500 kHz operation ensures clean, predictable ripple - avoids interference with sensitive bio-signal acquisition. |
| Handheld Instrument | GPS Receiver Module |
|
Use Scenario: Portable multimeter using two AA alkaline cells (1.8–3.2 V) requiring stable 3.3 V microcontroller supply. IC Role / Device Role / Timing Role: Main system rail regulator; handles dynamic load steps from display refresh and ADC sampling. Use Value: Integrated soft-start (750 µs) and inrush limiting prevent brown-out during power-on - ensures deterministic boot sequence. |
Use Scenario: Ultra-low-power GPS module in asset tracker, operating intermittently from Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: 3.3 V supply for GNSS RF IC and baseband processor; enabled only during satellite acquisition windows. Use Value: <1 µA shutdown current preserves decade-scale shelf life; input-to-output bypass maintains RTC bias during sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61291DRVR | 0.7 V start-up; 1.8–5.5 V input; 300 mA max IOUT; PFM/PWM auto-switching; 1.22 V feedback | Lacks input-to-output bypass mode; higher start-up voltage limits use with depleted alkaline cells | Select when PFM efficiency at light loads outweighs need for bypass functionality and sub-0.7 V start-up |
| Analog Devices ADP5070ACPZ-R7 | 2.85–15 V input; 200 mA max IOUT; 1.22 V feedback; external compensation; no bypass mode | Higher minimum input voltage (2.85 V); not suitable for single-cell or coin-cell operation | Choose for higher-input industrial or USB-powered applications where wider VIN range compensates for lower integration |
Compared with TPS61291DRVR and ADP5070ACPZ-R7, the MCP1640D-I/MC uniquely combines sub-0.7 V start-up, input-to-output bypass capability, and fixed 500 kHz PWM - making it the only option among the three qualified for CR2032-powered GPS trackers requiring both ultra-low-VIN operation and deep-sleep bias retention.
Availability
MCP1640D-I/MC is available at Aetrix Electronics and suitable for wireless sensor nodes, medical wearables, handheld instruments, GPS receivers, and portable instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MCP1640D-I/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 is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded and industrial applications.
The MCP1640/B/C/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-constrained portable electronics - emphasizing start-up reliability, minimal external components, and flexible shutdown modes.
FAQ
What is the minimum input voltage required for the MCP1640D-I/MC to start regulating 3.3 V output?
The MCP1640D-I/MC starts regulating 3.3 V output at 0.65 V typical input voltage with a 1 mA resistive load, as specified in DS20002234D-page 3. This ultra-low start-up threshold enables operation from nearly depleted alkaline or Li coin cells. The device sustains regulation down to 0.35 V input under light load conditions, making MCP1640D-I/MC especially suited for energy-critical portable applications where battery utilization must be maximized.
Does the MCP1640D-I/MC support true load disconnect or input-to-output bypass during shutdown?
The MCP1640D-I/MC implements input-to-output bypass mode - not true load disconnect. When EN is pulled low, its internal P-channel MOSFET connects VIN directly to VOUT, providing low-impedance bias for downstream circuits in deep-sleep states. This differs from the MCP1640/B's true disconnect mode. MCP1640D-I/MC consumes <1 µA in bypass mode, preserving battery life while maintaining system readiness - a key distinction confirmed in Table 4-1 and Section 4.1.4 of the datasheet.
What is the switching frequency behavior of the MCP1640D-I/MC under varying load conditions?
The MCP1640D-I/MC operates exclusively in PWM-only mode at a fixed 500 kHz nominal switching frequency (range 425–575 kHz), regardless of load. Unlike PFM-capable variants (MCP1640/C), it does not reduce frequency or skip pulses at light loads. This ensures consistent EMI profile and predictable output ripple - critical for noise-sensitive applications like GPS receivers or medical sensors where spectral stability matters more than marginal light-load efficiency gains.
How is output voltage adjusted on the MCP1640D-I/MC, and what is the reference voltage?
Output voltage on the MCP1640D-I/MC is set using an external resistor divider connected between VOUT, VFB, and GND. The internal feedback reference voltage is 1.21 V typical (1.175–1.245 V over temperature), as specified in the Electrical Characteristics table on DS20002234D-page 3. For example, a 976 kΩ top resistor and 309 kΩ bottom resistor yields 5.0 V output. High-value resistors minimize divider current, supporting ultra-low-quiescent designs - a feature explicitly validated for MCP1640D-I/MC in Section 5.2.
What thermal performance can be expected from the MCP1640D-I/MC in its 8-Lead DFN package?
In the 8-Lead 2×3 mm DFN package, the MCP1640D-I/MC has a junction-to-ambient thermal resistance (θJA) of 75°C/W, per DS20002234D-page 4. With its integrated overtemperature protection (150°C trip, 10°C hysteresis), the device safely limits power dissipation under sustained load. Layout best practices - including full-solder connection of the exposed thermal pad (EP) to a dedicated SGND/PGND copper pour - are essential to achieve this rating. No additional heatsinking is required for typical 350 mA output applications.
MCP1640D-I/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 350mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
MCP1640D-I/MC FAQ
1.How can I place an order for MCP1640D-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640D-I/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 MCP1640D-I/MC reliable?
The price and inventory of MCP1640D-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1640D-I/MC is usually 5 days.
3.What payment methods are accepted for MCP1640D-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640D-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640D-I/MC?
MCP1640D-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640D-I/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 MCP1640D-I/MC?
For technical support, including MCP1640D-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640D-I/MC requirements.
6.How does Aetrix verify that MCP1640D-I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1640D-I/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 MCP1640D-I/MC meets industry standards.
7.What is the process for return or replacement of MCP1640D-I/MC?
All MCP1640D-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640D-I/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 MCP1640D-I/MC part is unused and in its original packaging.
Return procedure for MCP1640D-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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