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Microchip Technology MCP1640BT-I/CHY
- Part No.:
- MCP1640BT-I/CHY
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-6
- Datasheet:
-
MCP1640BT-I/CHY.pdf
- Description:
- IC REG BOOST ADJ 350MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:13,447
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Product details
Overview
MCP1640BT-I/CHY from Microchip Technology is a synchronous step-up DC-DC converter optimized for ultra-low-voltage battery start-up and high-efficiency operation in portable systems. It delivers up to 350 mA output current at 5.0V from 3.3V input, starts reliably from 0.65V (typical), operates down to 0.35V input post-start-up, and integrates both N-Channel boost switch (0.6 Ω RDS(ON)) and P-Channel synchronous rectifier (0.9 Ω RDS(ON)). It is used in single-cell Li-ion to 5V power conversion for Bluetooth headsets and wireless sensors.
For engineers reviewing the MCP1640BT-I/CHY datasheet, MCP1640BT-I/CHY pinout, MCP1640BT-I/CHY application, or MCP1640BT-I/CHY equivalent, key selection criteria include its 0.65V start-up capability, true load disconnect shutdown mode (<1 µA), adjustable 2.0–5.5V output, 500 kHz fixed-frequency PWM-only operation, and SOT-23-6 package compatibility with space-constrained battery-powered designs.
Technical Context
The MCP1640BT-I/CHY implements fixed-frequency peak-current-mode PWM control without PFM mode-confirmed by device option table (MCP1640B variant) and functional description. Its internal oscillator maintains 425–575 kHz switching across temperature, and lossless current sensing with adaptive slope compensation ensures stability under varying VIN/VOUT conditions.
It features true output disconnect during shutdown: EN = GND disables both N- and P-channel switches, eliminating the diode path between VIN and VOUT, isolating the load while consuming <1 µA. Internal bias transitions from VIN at start-up to VOUT once regulation is achieved, enabling sustained operation down to 0.35V input at light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.65 V typical - enables reliable boot from deeply discharged alkaline or NiMH cells |
| Min Operating Input Voltage | 0.35 V typical at 1 mA - sustains regulation through full battery discharge curve |
| Output Voltage Range | 2.0 V to 5.5 V - set externally via resistor divider; supports 3.3V and 5.0V system rails |
| Switching Frequency | 425–575 kHz - fixed PWM-only operation ensures predictable EMI and low output ripple |
| Peak Switch Current Limit | 600–850 mA - defines maximum deliverable output current under boost ratio constraints |
| Quiescent Current (PFM) | 19 µA typical - measured at no load, VOUT = 4.0V, EN = VIN; enables multi-year battery life |
| Shutdown Current | <1 µA - true disconnect mode removes VIN-to-VOUT path, preserving battery charge |
| Thermal Shutdown Threshold | 150 °C - protects against thermal runaway during overload or poor PCB thermal design |
Pinout & Package
Package: 6-Lead SOT-23 (JEDEC MO-178AA), footprint-compatible with standard SOT-23-6 layouts; exposed pad not present in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Accepts 0.35–5.5V input; requires ≥4.7 µF local decoupling to PGND |
| GND | Signal and power return | Single ground pin serves error amplifier, bias circuits, and switch return path |
| SW | Switch node | Connects to boost inductor; carries up to 800 mA peak current; internal N-FET drain/P-FET source junction |
| VOUT | Regulated output voltage | Delivers final regulated output; connects to feedback divider top resistor and output capacitor |
| EN | Enable control input | Logic-level input: >90% VIN enables, <20% VIN disables; controls true disconnect state |
| VFB | Feedback voltage sense | Monitors output via resistor divider; internal reference = 1.21 V ±0.035 V; 10 pA bias current |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect shutdown | Removes VIN-to-VOUT DC path when disabled, preventing battery drain and enabling clean system power sequencing |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses and improves efficiency by ~5–8% vs. asynchronous designs |
| Internal compensation network | Enables stable loop response with only external inductor, input/output capacitors, and feedback resistors-no external compensation required |
| Low-noise anti-ringing control | Damps switch-node oscillations in discontinuous conduction mode, reducing radiated EMI without snubbers |
| Inrush current limiting & soft-start | 750 µs typical soft-start time prevents output overshoot and limits input surge during enable, protecting weak batteries |
Applications
| Wireless Sensor Nodes | Bluetooth Headsets |
|---|---|
Use Scenario: Ultra-low-power sensor node powered by coin cell or single alkaline cell, transmitting data intermittently. IC Role / Device Role / Timing Role: Primary voltage booster converting 1.2–1.5V battery output to stable 3.3V for MCU, RF transceiver, and analog front-end. Use Value: 0.65V start-up and 19 µA quiescent current extend battery life beyond 5 years in sleep-dominated duty cycles. |
Use Scenario: Compact audio headset requiring regulated 3.3V rail from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Efficient step-up converter maintaining constant 3.3V during dynamic audio load transients (e.g., codec burst current). Use Value: Fixed 500 kHz PWM operation minimizes audible noise and output ripple, avoiding interference with sensitive audio paths. |
| Personal Medical Devices | Handheld Instruments |
Use Scenario: Portable glucose meter or pulse oximeter using two AA alkaline cells (2.4–3.0V) powering mixed-signal circuitry. IC Role / Device Role / Timing Role: Provides isolated 5.0V rail for LCD backlight and precision ADC reference, with true disconnect during standby. Use Value: True load disconnect prevents battery self-discharge during multi-week storage, ensuring first-use reliability. |
Use Scenario: Battery-operated multimeter or thermal camera requiring stable 3.3V and 5.0V rails from variable input (e.g., 2–3 alkaline cells). IC Role / Device Role / Timing Role: Adjustable-output boost regulator supporting dual-rail generation via reconfigurable feedback dividers. Use Value: 2.0–5.5V output adjustability allows one BOM to serve multiple instrument variants without redesigning power stage. |
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 switch current, no true disconnect; requires external compensation | Better for sub-0.5V input sources; unsuitable where load isolation during shutdown is mandatory | Select if lowest possible start-up voltage is critical and true disconnect is unnecessary |
| Analog Devices ADP5070ARMZ-R7 | 2.85–15 V input, 200 mA max output, integrated LDO post-regulator, no SOT-23 package | Designed for higher-input industrial/battery systems; lacks ultra-low-voltage capability and compact footprint | Select for noise-sensitive analog systems needing post-LDO filtering, not for space-constrained portable devices |
Compared with TPS61200DRCT and ADP5070ARMZ-R7, the MCP1640BT-I/CHY uniquely combines 0.65V start-up, true output disconnect, SOT-23-6 packaging, and internal compensation-making it optimal for cost-sensitive, battery-life-critical portable designs where board area and shutdown leakage are primary constraints.
Availability
MCP1640BT-I/CHY is available at Aetrix Electronics and suitable for wireless sensor nodes, Bluetooth audio accessories, and personal medical devices requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1640BT-I/CHY 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, interface, and power management ICs, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software solutions.
The MCP1640/B/C/D family was designed specifically for ultra-low-voltage, high-efficiency boost conversion in battery-powered portable electronics-emphasizing minimal start-up voltage, true load disconnect, and minimal external component count.
FAQ
What is the minimum input voltage required for MCP1640BT-I/CHY to start switching?
The MCP1640BT-I/CHY has a typical start-up voltage of 0.65 V with a 3.3 V output and 1 mA resistive load. This value is confirmed in the Electrical Characteristics table (Note 1) and enables reliable operation from nearly depleted alkaline or NiMH cells. Below this threshold, the device remains non-functional; it does not attempt open-loop startup or enter brown-out recovery.
Does MCP1640BT-I/CHY support PFM mode operation?
No, MCP1640BT-I/CHY does not support PFM mode. It belongs to the MCP1640B variant group, which operates exclusively in PWM mode per Table 4-1 and Section 4.1.2. This ensures fixed 500 kHz switching frequency, lower output ripple, and predictable EMI behavior-critical for noise-sensitive applications like audio or RF subsystems.
What is the function of the VFB pin on MCP1640BT-I/CHY?
The VFB pin on MCP1640BT-I/CHY senses the output voltage via an external resistor divider and compares it to an internal 1.21 V reference. Its 10 pA input bias current allows use of high-value resistors (e.g., 976 kΩ/309 kΩ for 5.0 V), minimizing quiescent current draw and preserving battery life without compromising regulation accuracy.
How does the true output disconnect feature work in MCP1640BT-I/CHY?
When EN is pulled low, MCP1640BT-I/CHY turns off both its internal N-Channel boost switch and P-Channel synchronous rectifier, physically breaking the VIN-to-VOUT path-including the body diode conduction path. This results in <1 µA shutdown current and complete load isolation, preventing battery drain during storage or system sleep states.
What package type is used for MCP1640BT-I/CHY?
MCP1640BT-I/CHY uses the 6-Lead SOT-23 package (JEDEC MO-178AA), as specified in the Package Types section and Pin Function Table. It does not include an exposed thermal pad (EP), distinguishing it from the 8-lead DFN variant. Standard SOT-23-6 PCB footprints and reflow profiles apply.
MCP1640BT-I/CHY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-23-6
MCP1640BT-I/CHY FAQ
1.How can I place an order for MCP1640BT-I/CHY through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1640BT-I/CHY 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/CHY reliable?
The price and inventory of MCP1640BT-I/CHY 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/CHY is usually 5 days.
3.What payment methods are accepted for MCP1640BT-I/CHY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1640BT-I/CHY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1640BT-I/CHY?
MCP1640BT-I/CHY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1640BT-I/CHY 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/CHY?
For technical support, including MCP1640BT-I/CHY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1640BT-I/CHY requirements.
6.How does Aetrix verify that MCP1640BT-I/CHY is sourced from the original manufacturer or authorized distributors?
All MCP1640BT-I/CHY 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/CHY meets industry standards.
7.What is the process for return or replacement of MCP1640BT-I/CHY?
All MCP1640BT-I/CHY units undergo pre-shipment inspection (PSI). If there is an issue with MCP1640BT-I/CHY, 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/CHY part is unused and in its original packaging.
Return procedure for MCP1640BT-I/CHY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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