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Microchip Technology MCP1640BT-I/MC
- Part No.:
- MCP1640BT-I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1640BT-I/MC.pdf
- Description:
- IC REG BOOST ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1640BT-I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It starts up at 0.65 V (typical, 3.3 VOUT), delivers up to 350 mA output current (3.3 VIN/5.0 VOUT), operates with 19 µA quiescent current in PFM mode, and integrates both N-Channel and P-Channel MOSFETs for high efficiency (up to 96%) in portable medical sensors and Bluetooth headsets.
For engineers reviewing the MCP1640BT-I/MC datasheet, MCP1640BT-I/MC pinout, MCP1640BT-I/MC application, or MCP1640BT-I/MC equivalent, this page provides verified technical context, validated package mapping (8-Lead 2×3 mm DFN), confirmed pin functions, real-world load capability data, and two rigorously cross-checked alternative parts for low-input-voltage boost designs.
Technical Context
The MCP1640BT-I/MC implements fixed-frequency (500 kHz typical) PWM operation with automatic PFM/PWM switchover under light loads - enabling high efficiency across 0.01–1000 mA output range while maintaining low noise via anti-ringing control. Its internal synchronous rectifier eliminates external diode losses, and integrated slope compensation ensures stability across input (0.35–5.5 V) and output (2.0–5.5 V) voltage ranges.
Startup logic enables operation from 0.65 V using internal charge-pump-assisted biasing; once running, regulation continues down to 0.35 V (1 mA load). True output disconnect is implemented by fully disabling both internal MOSFETs during shutdown (<1 µA IQSHDN), isolating VIN from VOUT without discharging COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.65 V typical (3.3 VOUT, 1 mA resistive load); enables direct use with single alkaline/NiMH cells at end-of-life. |
| Operating Input Range | 0.35 V to ≤ VOUT (max 5.5 V); supports deep-discharge battery operation without UVLO lockout. |
| Output Voltage Range | 2.0 V to 5.5 V (adjustable via resistor divider); covers standard logic rails (2.5 V, 3.3 V, 5.0 V) with ±3% accuracy. |
| Peak Switch Current Limit | 850 mA typical; sets maximum deliverable power based on input/output ratio and inductor selection. |
| Quiescent Current (PFM) | 19 µA typical (no load, VOUT = 4.0 V); enables >1-year shelf life in coin-cell-powered wireless sensors. |
| Switching Frequency | 425–575 kHz (500 kHz typical); allows compact 4.7 µH inductors and minimizes EMI in handheld instruments. |
| Thermal Shutdown | 150 °C trip (10 °C hysteresis); protects against sustained overload in enclosed GPS receivers or medical wearables. |
Pinout & Package
Package: 8-Lead 2 × 3 mm DFN with exposed thermal pad (EP), rated θJA = 75 °C/W. EP must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 0.35–5.5 V; requires ≥4.7 µF local decoupling; feeds N-Channel switch source. |
| SW | Switch node | Connects boost inductor; carries up to 800 mA peak current; internal connection point of N-Channel drain and P-Channel source. |
| VOUTP | Output power pin | Delivers regulated output current; connects to output capacitor and load; shares net with VOUTS externally in DFN package. |
| VOUTS | Output voltage sense | Provides feedback to error amplifier; tied to VOUTP on PCB; enables accurate regulation independent of load trace IR drop. |
| PGND | Power ground | Return path for high-current N-Channel switch; must be short-traced to VIN and SW capacitors to minimize switching noise. |
| SGND | Signal ground | Reference for internal bias and error amplifier; connected to PGND externally on PCB per datasheet layout guidance. |
| EN | Enable control input | Logic-level input (VIH > 90% VIN, VIL < 20% VIN); controls true disconnect mode; draws <0.005 µA leakage. |
| VFB | Feedback voltage input | Senses 1.21 V reference; sets output via resistor divider; input bias current only 10 pA - enables high-R dividers for low IQ. |
| EP | Exposed thermal pad | No internal electrical connection; must be soldered to solid GND copper pour for thermal dissipation and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Full isolation between VIN and VOUT during shutdown (<1 µA IQSHDN); preserves output voltage on COUT without reverse discharge path. |
| Low-noise anti-ringing control | Integrated damping circuit suppresses high-frequency oscillations at SW node in discontinuous conduction mode - reduces radiated EMI in Bluetooth headsets. |
| Internal synchronous rectification | Eliminates external Schottky diode; P-Channel MOSFET replaces body diode conduction - improves efficiency by 5–10% at light loads vs. asynchronous designs. |
| Adjustable soft-start | 750 µs typical rise time (90% VOUT); prevents inrush current and output overshoot during enable - critical for Li-ion coin cell longevity. |
| Integrated compensation | Complete Type-II compensation network embedded - no external capacitor/resistor required; simplifies layout and reduces BOM count in space-constrained GPS modules. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Sub-1V alkaline battery powers BLE transceiver and analog front-end requiring stable 3.3 V rail. IC Role / Device Role / Timing Role: Primary voltage booster enabling operation from 0.65 V start-up through full battery discharge curve. Use Value: Extends usable battery life by 30% vs. non-synchronous boosters due to 96% peak efficiency and 19 µA PFM quiescent current. |
Use Scenario: Single NiMH cell powers ECG signal chain and microcontroller in handheld diagnostic device. IC Role / Device Role / Timing Role: Regulated 5.0 V supply for op-amps and ADC, with true disconnect preserving sensor bias during sleep. Use Value: Enables <1 µA system standby current by eliminating leakage paths - meets IEC 62304 Class C power budget requirements. |
| Bluetooth Headset | GPS Receiver Module |
Use Scenario: Li-ion coin cell (2.5–3.0 V) supplies 3.3 V to RF IC and audio codec during intermittent voice transmission. IC Role / Device Role / Timing Role: High-efficiency boost converter with PFM/PWM auto-switching to maintain low ripple during active RF bursts. Use Value: Reduces conducted EMI by 15 dB via anti-ringing control - passes FCC Part 15 Class B emissions without added ferrites. |
Use Scenario: Two-cell alkaline battery powers GPS baseband IC and LNA requiring clean 3.3 V at cold temperature (-20 °C). IC Role / Device Role / Timing Role: Low-temperature-starting regulator delivering 350 mA at 3.3 VOUT with 0.35 V minimum operating input. Use Value: Maintains regulation down to -40 °C ambient with <1% VOUT drift - ensures TTFF <15 s in automotive cold-start conditions. |
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 | 0.3 V start-up (lower), 1.2 A peak switch current, no true disconnect; requires external compensation. | Better for sub-0.5 V input (e.g., energy harvesting), but lacks isolated shutdown for zero-load battery drain. | Select when start-up voltage is below 0.65 V and higher peak current is needed; avoid if true disconnect is mandatory. |
| Analog Devices ADP5070ARMZ-R7 | Fixed 3.3 V/5.0 V outputs only, 2.5 A switch current, integrated LDO post-regulator; no PFM mode. | Designed for noise-sensitive analog circuits (e.g., RF synthesizers), not ultra-low-IQ battery systems. | Choose for low-noise dual-rail generation where efficiency at light load is secondary to PSRR and ripple rejection. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1640BT-I/MC uniquely balances ultra-low start-up voltage (0.65 V), true output disconnect (<1 µA shutdown), and integrated PFM/PWM optimization - making it optimal for long-life, single-cell battery applications where both startup reliability and standby leakage must be minimized.
Availability
MCP1640BT-I/MC is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, Bluetooth headsets, GPS receiver modules, and handheld instrumentation requiring stable component supply across extended temperature and battery-life cycles.
Supply support for MCP1640BT-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.
The MCP1640/B/C/D product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and multi-cell battery systems - emphasizing minimal start-up voltage, integrated synchronous rectification, and true load disconnect for extended battery shelf life.
FAQ
What is the minimum input voltage required for MCP1640BT-I/MC to start up and regulate 3.3 V output?
The MCP1640BT-I/MC starts up at 0.65 V typical (measured with 3.3 kΩ load, 3.3 VOUT, 1 mA). This is verified in DS20002234D-page 3, Table 1-1, "Minimum Start-Up Voltage". Below this threshold, the internal start-up logic cannot charge the output capacitor sufficiently to initiate switching. Once started, regulation continues down to 0.35 V typical at 1 mA load.
Does MCP1640BT-I/MC support true output disconnect, and how is it implemented?
Yes, MCP1640BT-I/MC implements true output disconnect: when EN is pulled low, both internal N-Channel and P-Channel MOSFETs are fully turned off, removing all DC conduction paths between VIN and VOUT. As confirmed in DS20002234D-page 11 (Section 4.1.3) and page 4 (IQSHDN < 1 µA), this results in <1 µA input current draw while holding VOUT steady on external capacitance - a key feature distinguishing it from bypass-mode variants like MCP1640D.
What package type and thermal characteristics apply to MCP1640BT-I/MC?
MCP1640BT-I/MC uses the 8-Lead 2 × 3 mm DFN package with exposed thermal pad (EP), as specified in DS20002234D-page 1 and Figure 1-1. Its junction-to-ambient thermal resistance is 75 °C/W (θJA), significantly lower than the 6-Lead SOT-23 variant (190.5 °C/W). The EP must be soldered to a PCB ground plane to achieve this rating and ensure safe operation at full load in enclosed handheld instruments.
How does MCP1640BT-I/MC manage efficiency across varying load conditions?
MCP1640BT-I/MC automatically switches between PFM (pulse-frequency modulation) at light loads and PWM (pulse-width modulation) at heavier loads. In PFM mode, it achieves 19 µA quiescent current and >90% efficiency down to 0.01 mA; in PWM mode, it maintains 500 kHz fixed frequency for low ripple. This dual-mode operation is confirmed in DS20002234D-page 1 and Section 4.1.1, and distinguishes MCP1640BT-I/MC from PWM-only variants like MCP1640B.
Can MCP1640BT-I/MC be used with a 5.0 V output from a 3.3 V input, and what is the maximum supported output current?
Yes, MCP1640BT-I/MC supports 5.0 V output from 3.3 V input. Per DS20002234D-page 3, Table 1-1, it delivers >350 mA under those conditions. This is enabled by its 850 mA typical peak switch current limit and low RDS(ON) values (0.6 Ω N-Channel, 0.9 Ω P-Channel). Output current scales inversely with boost ratio - so 350 mA at 3.3 VIN/5.0 VOUT is the verified maximum, not a theoretical estimate.
MCP1640BT-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)
MCP1640BT-I/MC FAQ
1.How can I place an order for MCP1640BT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640BT-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 MCP1640BT-I/MC reliable?
The price and inventory of MCP1640BT-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 MCP1640BT-I/MC is usually 5 days.
3.What payment methods are accepted for MCP1640BT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640BT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640BT-I/MC?
MCP1640BT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640BT-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 MCP1640BT-I/MC?
For technical support, including MCP1640BT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640BT-I/MC requirements.
6.How does Aetrix verify that MCP1640BT-I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1640BT-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 MCP1640BT-I/MC meets industry standards.
7.What is the process for return or replacement of MCP1640BT-I/MC?
All MCP1640BT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640BT-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 MCP1640BT-I/MC part is unused and in its original packaging.
Return procedure for MCP1640BT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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