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Microchip Technology MCP1640DT-I/MC
- Part No.:
- MCP1640DT-I/MC
- Manufacturer:
- Microchip Technology
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
MCP1640DT-I/MC.pdf
- Description:
- IC REG BOOST ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,814
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Product details
Overview
MCP1640DT-I/MC from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery-powered systems. It starts up from 0.65V input (typical, 3.3V output @ 1 mA), delivers up to 350 mA output current at 3.3V VIN → 5.0V VOUT, integrates N- and P-channel synchronous switches (RDS(ON) = 0.6 Ω / 0.9 Ω), and operates in automatic PFM/PWM mode with 500 kHz fixed PWM frequency. It is used in single-cell Li-ion to 5V conversion for Bluetooth headsets and wireless sensors.
For engineers reviewing the MCP1640DT-I/MC datasheet, MCP1640DT-I/MC pinout, MCP1640DT-I/MC application, or MCP1640DT-I/MC equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency behavior across input voltage ranges, and real-world design meaning for low-quiescent-current boost regulation in portable medical and sensing devices.
Technical Context
The MCP1640DT-I/MC implements a fixed-frequency (425–575 kHz) peak-current-mode synchronous boost architecture with integrated N-channel main switch and P-channel synchronous rectifier. Its adaptive slope compensation ensures stability across input/output ratios, while lossless current sensing enables accurate 800 mA typical peak current limiting.
It supports true output disconnect during shutdown (<1 µA IQSHDN), internal soft-start (750 µs), and adjustable output (2.0–5.5 V) via external resistor divider referenced to 1.21 V feedback voltage. No external compensation is required due to fully integrated error amplifier and compensation network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-up Voltage | 0.65 V typical - enables operation from deeply discharged alkaline or NiMH cells without external bias. |
| Quiescent Current (PFM) | 19 µA typical - sustains >100-hour standby on coin cell without significant discharge. |
| Peak Switch Current Limit | 850 mA typical - sets maximum deliverable power before foldback; determines max IOUT vs. VIN/VOUT ratio. |
| Feedback Reference Voltage | 1.21 V ±0.035 V - defines precision of output regulation; enables 2.0–5.5 V adjustment with <±3% total VOUT accuracy. |
| Switching Frequency | 500 kHz typical - balances EMI control, inductor size (4.7 µH typical), and efficiency across load range. |
| Thermal Shutdown Threshold | 150°C typical - protects against sustained overload or poor PCB thermal design; includes 10°C hysteresis. |
| Input Voltage Range (post-start) | 0.35 V minimum - allows continuous regulation down to near-dead battery voltage at light loads. |
Pinout & Package
Package: 8-Lead 2 × 3 mm DFN with exposed thermal pad (EP). Requires external connection of SGND and PGND pins per 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; feeds internal bias during start-up. |
| VFB | Feedback sense input | High-impedance node (10 pA bias) referencing 1.21 V; sets output via resistor divider; sensitive to leakage paths. |
| EN | Logic enable control | Active-high input with VIN-referenced thresholds (VIH > 90% VIN, VIL < 20% VIN); controls true disconnect mode. |
| SW | Switch node | Connects to boost inductor; carries up to 800 mA peak current; internal connection point of N- and P-channel FETs. |
| VOUTP | Output power delivery | High-current path from P-channel FET to output capacitor and load; separate from sense path for improved regulation. |
| VOUTS | Output voltage sense | Low-noise reference for internal error amplifier; externally tied to VOUTP in DFN package per datasheet. |
| PGND | Power ground return | Return path for high di/dt inductor current; must be routed separately from SGND and connected externally in DFN. |
| SGND | Signal ground reference | Return for internal bias, error amplifier, and VFB; requires short, low-inductance trace to minimize noise coupling. |
| EP | Exposed thermal pad | No internal electrical connection; must be soldered to PCB thermal plane and tied to PGND/SGND potential. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM/PWM mode switching | Enables >90% efficiency at light loads (e.g., 1 mA) while maintaining 500 kHz PWM at full load - eliminates need for manual mode selection. |
| True output disconnect in shutdown | Removes DC path between VIN and VOUT when EN = GND; holds VOUT via COUT while drawing <1 µA - critical for zero-leakage sleep states. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses by ~30% vs. asynchronous designs at 100–300 mA loads. |
| Internal soft-start and anti-ringing control | 750 µs controlled ramp prevents output overshoot and damps switch-node ringing - improves EMI and system reliability. |
| Low-noise operation in discontinuous conduction mode | Integrated damping circuit suppresses high-frequency oscillations at SW node - reduces radiated emissions without added snubbers. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Primary 3.3V rail generator from single 1.5V alkaline cell; supplies MCU, RF transceiver, and analog front-end. Use Value: 0.65V start-up and 19 µA quiescent current extend battery life beyond 2 years; true disconnect prevents sensor self-discharge during sleep. |
Use Scenario: Handheld pulse oximeter using AAA alkaline cells with intermittent LED and ADC operation. IC Role / Device Role / Timing Role: Generates stable 3.3V for microcontroller and optical sensor interface; handles dynamic load steps from LED pulses. Use Value: 850 mA peak current limit supports 100 mA LED bursts; PFM/PWM auto-switching maintains >92% efficiency across 0.1–100 mA load range. |
| Bluetooth Headset Power Supply | Li-Coin Cell IoT Tracker |
|
Use Scenario: Compact headset requiring regulated 3.3V from single 3.7V Li-ion cell with deep discharge tolerance. IC Role / Device Role / Timing Role: Step-up regulator enabling 3.3V operation down to 2.8V cell voltage; manages audio codec and BT radio power sequencing. Use Value: 0.35V post-start minimum input allows use of cell down to 2.5V; internal compensation avoids layout sensitivity in space-constrained earpiece PCB. |
Use Scenario: GPS-enabled asset tracker powered by CR2032 coin cell, waking every 10 minutes for location fix. IC Role / Device Role / Timing Role: Boosts 3.0V coin cell to 3.3V for GPS module and MCU; enters true disconnect during 9.9-min sleep intervals. Use Value: <1 µA shutdown current preserves coin cell capacity; 500 kHz switching enables compact 4.7 µH inductor and minimal footprint. |
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 | Fixed 3.3V output; no adjustable VOUT; 0.3V start-up; 1.2A switch current limit. | Lacks programmable output and true disconnect; better suited for fixed-rail, higher-current apps with tighter input range. | Select when fixed 3.3V output suffices and >1A peak current is needed; avoid if adjustable VOUT or zero-leakage shutdown is required. |
| Analog Devices ADP5070ARMZ-R7 | Higher 2.5V min input; dual-output capability; 1.2MHz switching; external compensation required. | Designed for multi-rail industrial systems; not optimized for sub-1V start-up or coin-cell leakage constraints. | Choose for dual-output or higher-frequency designs where board area permits external compensation components. |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1640DT-I/MC uniquely combines ultra-low start-up voltage (0.65V), true output disconnect, and fully integrated compensation - making it the only option among the three suitable for long-life, single-cell alkaline/NiMH or Li-coin applications demanding zero standby leakage and wide input regulation.
Availability
MCP1640DT-I/MC is available at Aetrix Electronics and suitable for wireless sensors, portable medical monitors, Bluetooth headsets, and Li-coin cell IoT trackers requiring stable component supply with guaranteed long-term availability.
Supply support for MCP1640DT-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 company specializing in microcontrollers, analog, and power management ICs for embedded control applications.
The MCP1640/B/C/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered portable electronics - prioritizing start-up capability, quiescent current, and integration over raw power density.
FAQ
What is the minimum input voltage required for the MCP1640DT-I/MC to start regulating?
The MCP1640DT-I/MC has a typical start-up voltage of 0.65 V under 3.3 V output and 1 mA resistive load conditions. This value is confirmed in the Electrical Characteristics table (DS20002234D, page 3) and enables reliable operation from nearly depleted alkaline or NiMH cells. Once started, regulation continues down to 0.35 V input at light loads, as verified in the same datasheet section.
Does the MCP1640DT-I/MC support adjustable output voltage, and what is the supported range?
Yes, the MCP1640DT-I/MC supports adjustable output voltage from 2.0 V to 5.5 V using an external resistor divider connected to the VFB pin. The internal feedback reference is 1.21 V ±0.035 V, and output accuracy is specified as ±3% including line and load regulation. This range is explicitly stated in the General Description and Electrical Characteristics sections of DS20002234D.
How does the MCP1640DT-I/MC achieve true output disconnect during shutdown?
When the EN pin is pulled low, the MCP1640DT-I/MC disables both the N-channel boost switch and the P-channel synchronous rectifier, removing the DC path between VIN and VOUT. This "true disconnect" mode draws <1 µA from the input source while preserving output voltage via external COUT. This behavior is documented in Section 4.1.3 and Table 4-1 of DS20002234D.
What is the switching frequency of the MCP1640DT-I/MC, and how stable is it across temperature?
The MCP1640DT-I/MC operates at a nominal switching frequency of 500 kHz, with a production range of 425–575 kHz. Figure 2-11 in DS20002234D shows frequency variation of ±15 kHz over –40°C to +85°C ambient, confirming tight thermal stability. This fixed-frequency operation is maintained in PWM mode and serves as the base frequency during PFM burst cycles.
Can the MCP1640DT-I/MC be used with a single-cell Li-ion battery to generate 5.0 V output?
Yes - the MCP1640DT-I/MC delivers >350 mA output current when stepping up from 3.3 V input to 5.0 V output, as confirmed in the Features section and DC Characteristics table (page 3). With typical Li-ion operating range (3.0–4.2 V), it supports robust 5.0 V rail generation for USB-peripheral interfaces or logic-level translation, provided inductor and capacitor ratings meet ripple and transient requirements.
MCP1640DT-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)
MCP1640DT-I/MC FAQ
1.How can I place an order for MCP1640DT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640DT-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 MCP1640DT-I/MC reliable?
The price and inventory of MCP1640DT-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 MCP1640DT-I/MC is usually 5 days.
3.What payment methods are accepted for MCP1640DT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640DT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640DT-I/MC?
MCP1640DT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640DT-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 MCP1640DT-I/MC?
For technical support, including MCP1640DT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640DT-I/MC requirements.
6.How does Aetrix verify that MCP1640DT-I/MC is sourced from the original manufacturer or authorized distributors?
All MCP1640DT-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 MCP1640DT-I/MC meets industry standards.
7.What is the process for return or replacement of MCP1640DT-I/MC?
All MCP1640DT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640DT-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 MCP1640DT-I/MC part is unused and in its original packaging.
Return procedure for MCP1640DT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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