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Microchip Technology MCP1640T-I/MC
- Part No.:
- MCP1640T-I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1640T-I/MC.pdf
- Description:
- IC REG BOOST ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1640T-I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-input-voltage battery-powered systems. It delivers up to 350 mA output at 5.0V from 3.3V input, starts reliably at 0.65V (typical), operates down to 0.35V post-startup, integrates N- and P-channel MOSFETs with 0.6Ω/0.9Ω RDS(ON), and supports adjustable output from 2.0V to 5.5V - enabling single-cell Li-ion to 5V conversion in handheld medical sensors.
For engineers reviewing the MCP1640T-I/MC datasheet, MCP1640T-I/MC pinout, MCP1640T-I/MC application, or MCP1640T-I/MC equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves across VIN/VOUT combinations, real-world load transient behavior, and two rigorously cross-checked alternative parts for low-voltage boost design.
Technical Context
The MCP1640T-I/MC implements fixed-frequency (425–575 kHz) peak-current-mode PWM control with automatic PFM/PWM mode transition below ~10–50 mA load, depending on VIN/VOUT. Its internal slope compensation adapts to input/output voltage ratios to maintain stability without external components.
It integrates dual MOSFETs - an N-channel boost switch and a P-channel synchronous rectifier - with true output disconnect during shutdown (<1 µA IQSHDN), soft-start (750 µs), overtemperature protection (150°C trip, 10°C hysteresis), and anti-ringing switch control to suppress high-frequency node oscillations in discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V typical - enables reliable boot from deeply discharged alkaline/NiMH cells or Li coin cells without external bias. |
| Min Operating VIN | 0.35 V typical at 1 mA - sustains regulation down to near-dead battery states in portable medical devices. |
| Output Range | 2.0 V to 5.5 V - set via external resistor divider; supports 3.3V logic rails and 5.0V USB-peripheral interfaces. |
| Switching Frequency | 425–575 kHz - fixed oscillator enables predictable EMI filtering and compact magnetics (e.g., 4.7 µH inductor). |
| Peak Switch Current | 850 mA typical - determines max deliverable output current under boost ratio constraints (e.g., 350 mA @ 3.3V→5.0V). |
| Quiescent Current | 19 µA typical in PFM no-load - extends shelf life of battery-powered wireless sensors with infrequent wake-ups. |
| Feedback Voltage | 1.21 V ±0.035 V - precision reference enables ±3% VOUT accuracy across line/load/temperature. |
| Thermal Shutdown | 150°C with 10°C hysteresis - protects against thermal runaway during sustained high-current operation in sealed enclosures. |
Pinout & Package
Package: 8-Lead 2 × 3 mm DFN with exposed thermal pad (EP). Requires external connection of SGND and PGND pins per PCB layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 0.35–5.5 V; must be decoupled with ≥4.7 µF capacitor to minimize noise coupling into SW node. |
| SW | Switch node | Connects boost inductor; carries up to 800 mA peak current; high dv/dt node requiring tight loop area to reduce EMI. |
| VOUTP | Output power delivery | High-current path to output capacitor and load; shares net with VOUTS externally in DFN package. |
| VOUTS | Output voltage sensing | Connects to feedback divider; referenced to SGND; requires low-noise routing away from SW/GND return paths. |
| VFB | Feedback input | Monitors resistive divider output; 10 pA bias current enables use of >1 MΩ resistors to minimize quiescent drain. |
| EN | Enable control | Logic-level input: >90% VIN = enable, <20% VIN = shutdown; supports battery-saving deep-sleep sequencing. |
| PGND | Power ground return | Return path for N-channel switch; must be tied to SGND externally on PCB; separate from signal ground plane. |
| SGND | Signal ground reference | Reference for error amplifier and bias circuits; routed separately from PGND until single-point connection at EP. |
| EP | Exposed thermal pad | No internal electrical connection; must be soldered to large copper pour for θJA = 75°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Removes DC path between VIN and VOUT during shutdown (<1 µA leakage), preserving battery charge and preventing backfeed in multi-rail systems. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by ~300 mV drop, enabling >96% peak efficiency at mid-load. |
| Adaptive slope compensation | Automatically adjusts compensation based on VIN/VOUT ratio, ensuring stable current-mode control without external tuning. |
| Low-noise anti-ringing control | Damps parasitic LC ringing at SW node in DCM, reducing radiated EMI and eliminating need for snubbers in space-constrained designs. |
| Internal soft-start | 750 µs controlled ramp prevents inrush current surges and output overshoot during cold start from weak batteries. |
| Overtemperature protection | Auto-restarts after 10°C cooldown; prevents permanent damage during sustained overload or poor heatsinking in handheld enclosures. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via BLE. IC Role / Device Role / Timing Role: Primary 3.3V rail generator from single AA alkaline cell (0.8–1.5V range). Use Value: 0.65V start-up ensures operation through full battery discharge curve; 19 µA quiescent current extends 2-year battery life. |
Use Scenario: Handheld pulse oximeter using single Li-ion cell (3.0–4.2V) to power analog front-end and MCU. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5.0V for optical driver and ADC reference. Use Value: 350 mA capability at 3.3V→5.0V meets peak LED drive demand; true disconnect isolates VOUT during sleep to prevent battery drain. |
| Bluetooth Headset | GPS Receiver Module |
Use Scenario: Compact headset requiring 3.3V for audio codec and BLE radio from single Li-Po cell. IC Role / Device Role / Timing Role: Efficient boost converter maintaining regulated rail during RF transmit bursts. Use Value: PFM/PWM auto-transition minimizes ripple during voice calls while sustaining >90% efficiency at light loads between packets. |
Use Scenario: Low-power GPS module in asset tracker powered by CR2032 coin cell (2.0–3.0V). IC Role / Device Role / Timing Role: 2.0V→3.3V boost supply enabling GPS IC operation during brief acquisition windows. Use Value: 0.35V minimum operating voltage allows extraction of final 10% energy from coin cell; 4.7 µH inductor fits 8-mm² footprint. |
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 TPS61200DRCT | Fixed 3.3V output; no adjustable VOUT; 0.3V min VIN; 1.2A switch current; no true disconnect. | Lacks output voltage flexibility and input-to-output isolation - unsuitable for multi-rail systems requiring shutdown isolation. | Select when fixed 3.3V output suffices and higher peak current (1.2A) is needed for pulsed loads. |
| Analog Devices ADP5070ARMZ-R7 | Adjustable output (1.2–15V); 2.5A switch current; requires external MOSFETs; no integrated P-channel sync rectifier. | Higher complexity and BOM count; lacks ultra-low-VIN capability (min VIN = 1.8V); no true disconnect function. | Choose for higher output voltage or current requirements where board space permits discrete FETs and external compensation. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1640T-I/MC uniquely combines sub-1V start-up, true output disconnect, integrated dual-MOSFET topology, and adjustable output in a 2×3 mm DFN - making it optimal for space- and battery-life-constrained single-cell systems where rail isolation and wide VOUT flexibility are mandatory.
Availability
MCP1640T-I/MC is available at Aetrix Electronics and suitable for wireless sensors, portable medical monitors, Bluetooth headsets, and GPS receivers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1640T-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 Inc. is a leading provider of microcontrollers, analog, and mixed-signal ICs, with core expertise in low-power, battery-optimized semiconductor solutions.
The MCP1640 family targets ultra-low-input-voltage boost conversion for single- and multi-cell battery systems, emphasizing minimal quiescent current, robust start-up from depleted cells, and integrated protection for portable and medical edge devices.
FAQ
What is the minimum input voltage required for MCP1640T-I/MC to start switching?
The MCP1640T-I/MC starts switching at 0.65 V typical when delivering 1 mA into a 3.3 V output load. This ultra-low start-up voltage enables operation from nearly exhausted alkaline, NiMH, or Li coin cells. The device continues regulating down to 0.35 V after startup, provided load current remains ≤1 mA and source impedance is low. Start-up behavior is verified per DS20002234D-page 3, Note 1.
Does MCP1640T-I/MC support true output disconnect during shutdown?
Yes, MCP1640T-I/MC implements true output disconnect: when EN is pulled low, the internal P-channel MOSFET turns off completely, removing the DC path between VIN and VOUT. This isolates the output capacitor from the input source, limiting shutdown current to <1 µA and preventing battery drain or backfeed. This feature is confirmed in DS20002234D-page 11 (Table 4-1) and page 10 (Section 4.1.3).
What is the maximum output current achievable with MCP1640T-I/MC at 5.0V output?
At 5.0 V output, MCP1640T-I/MC delivers up to 350 mA when supplied from 3.3 V input, as specified in DS20002234D-page 3 (DC CHARACTERISTICS table, "Maximum Output Current" row). This value is constrained by the 850 mA typical peak switch current limit and efficiency losses at higher boost ratios. Performance degrades at lower VIN (e.g., 150 mA @ 1.2V→5.0V).
How does the PFM/PWM mode transition work in MCP1640T-I/MC?
MCP1640T-I/MC automatically transitions from PWM to PFM mode below a load-dependent threshold (e.g., ~10–50 mA), reducing switching frequency and quiescent current to 19 µA. In PFM, it pulses at ~500 kHz to recharge the output capacitor, then coasts - minimizing light-load losses. This behavior is documented in DS20002234D-page 13 (Section 4.2.3) and Figure 2-5.
Which package variant does MCP1640T-I/MC use, and what are its thermal characteristics?
MCP1640T-I/MC uses the 8-Lead 2 × 3 mm DFN package with exposed thermal pad (EP). Its junction-to-ambient thermal resistance is 75°C/W when properly soldered to a 1-in² copper pad, enabling continuous 350 mA operation without forced airflow. This is specified in DS20002234D-page 4 (Package Thermal Resistances table).
MCP1640T-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
MCP1640T-I/MC FAQ
1.How can I place an order for MCP1640T-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640T-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 MCP1640T-I/MC reliable?
The price and inventory of MCP1640T-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 MCP1640T-I/MC is usually 5 days.
3.What payment methods are accepted for MCP1640T-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640T-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640T-I/MC?
MCP1640T-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640T-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 MCP1640T-I/MC?
For technical support, including MCP1640T-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640T-I/MC requirements.
6.How does Aetrix verify that MCP1640T-I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1640T-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 MCP1640T-I/MC meets industry standards.
7.What is the process for return or replacement of MCP1640T-I/MC?
All MCP1640T-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640T-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 MCP1640T-I/MC part is unused and in its original packaging.
Return procedure for MCP1640T-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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