MCP1640BT-I/CHY Microchip Integrated Circuit (SOT23 (6-Pin)) In Stock
MCP1640BT-I/CHY is a current-mode PWM boost DC-DC converter from Microchip that operates from input voltages as low as 0.65 V and delivers an adjustable output from 2 V to 5.5 V. It integrates automatic pass-through mode to maintain output even when input voltage exceeds the set output. Packaged in a 6-pin SOT-23, it targets single-cell battery-powered devices, IoT nodes, and portable consumer electronics.
- Manufacturer
- Microchip
- Package
- SOT23 (6-Pin)
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Datasheet
- MCP1640BT-I/CHY Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4170(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM boost converter with 0.65 V minimum input voltage
- Adjustable output voltage from 2 V to 5.5 V via external resistor divider
- Automatic true output disconnect and pass-through mode
- Compact 6-pin SOT-23 package for space-constrained portable designs
- 1.2 V nominal input suits single alkaline or NiMH cell operation
- Pulse-width modulation control for stable regulation across load range
- Factory lead time of 7 weeks with long product lifecycle (YTEOL 7)
Applications
The MCP1640BT-I/CHY is designed for single-cell battery-powered products where the input voltage starts at 1.5 V fresh and drops to below 1 V as the cell discharges, including wireless sensor nodes, Bluetooth Low Energy beacons, and portable medical monitors. Its 0.65 V minimum start voltage allows the device to extract nearly all usable energy from alkaline and NiMH cells. Adjustable output from 2 V to 5.5 V also makes it suitable for boosting a lithium-ion cell output to a fixed 5 V USB-compatible rail in compact wearable accessories.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | SOT-23-6 |
| Factory Lead Time | 7Weeks |
| YTEOL | 7 |
| Additional Feature | ALSO OPERATES IN ADJUSTABLE MODE FROM 2V TO 5.5V |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Nom | 1.2V |
| JESD-30 Code | R-PDSO-G6 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Voltage-Max | 5.5V |
| Output Voltage-Min | 2V |
| Output Voltage-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSOP6,.11,37 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, LOW PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 575kHz |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Package | SOT23 (6-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for MCP1640BT-I/CHY:
Frequently Asked Questions
What is the minimum input voltage at which the MCP1640BT-I/CHY can start and operate?
The MCP1640BT-I/CHY starts operation from as low as 0.65 V input, allowing it to boost a deeply discharged single AAA or AA alkaline cell. At the nominal 1.2 V input, it delivers a regulated adjustable output from 2 V to 5.5 V with stable current-mode PWM control. This low startup threshold extends usable battery runtime significantly compared to boost converters that require 1.8 V or higher to start.
How is the output voltage of the MCP1640BT-I/CHY set, and what range is achievable?
Output voltage is set by an external resistor divider connected to the feedback pin, following the standard boost converter formula. The achievable range spans 2 V to 5.5 V, covering common logic supply voltages including 3.3 V and 5 V. Standard 1% tolerance resistors with values in the 100 kΩ range are sufficient to set voltage accuracy to within a few millivolts of the target, meeting the requirements of 3.3 V microcontroller and sensor supply rails.
What does the automatic pass-through mode provide in MCP1640BT-I/CHY designs?
Automatic pass-through mode connects the input directly to the output when the input voltage exceeds the regulated output setpoint, bypassing the boost switching stage. This prevents overvoltage on the output if the input rises above the target, for example when a freshly charged 1.5 V alkaline cell exceeds a 1.2 V output setting. The feature also eliminates the need for an external diode-OR circuit in applications where the input can swing above the desired output.
Why is the 6-pin SOT-23 package a good choice for IoT sensor node power supplies?
The 6-pin SOT-23 package (JEDEC R-PDSO-G6) measures approximately 2.9 mm × 1.6 mm, occupying under 5 mm² of PCB area. Combined with a single external inductor in the 2.2 µH to 10 µH range and two small ceramic capacitors, the complete MCP1640BT-I/CHY boost regulator circuit fits in under 30 mm² total, enabling compact coin-cell or AAA-cell power sections on small IoT and wearable module designs.
How does current-mode PWM control benefit the MCP1640BT-I/CHY in battery discharge applications?
Current-mode PWM control inherently limits peak inductor current on a cycle-by-cycle basis, preventing inductor saturation and protecting the battery from excessive pulse loads that could cause voltage collapse. This architecture also provides fast transient response to load steps, maintaining output voltage regulation within tens of millivolts when a 32 MHz radio module switches from sleep to active transmit mode and draws burst currents in the 10 mA to 50 mA range.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.4170 | $0.42 |
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