MCP1640B-I/MC Microchip Integrated Circuit (Small Outline No-lead) In Stock
Microchip MCP1640B-I/MC is a synchronous boost DC/DC converter delivering up to 350 mA output current at 500 kHz switching frequency. Operates from inputs as low as 0.65 V, with adjustable output from 2 V to 5.5 V in an 8-pin DFN package. In stock worldwide with fast shipping.
- Manufacturer
- Microchip
- Package
- Small Outline No-lead
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- MCP1640B-I/MC Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.5900(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
- Synchronous boost operation from input voltages as low as 0.65 V startup and 0.35 V UVLO for single-cell battery powered designs
- 350 mA peak switch current with 500 kHz fixed-frequency PWM current-mode control minimizing external filter size
- Adjustable output voltage range of 2 V to 5.5 V covering USB, 3.3 V, and 5 V rails from a single inductor
- True load disconnect during shutdown eliminates battery drain and prevents output voltage overshoot in portable applications
Applications
The MCP1640B-I/MC is ideally suited for single-cell alkaline or NiMH battery-powered devices such as wireless sensors, GPS trackers, and handheld meters where the battery voltage drops below the required 3.3 V or 5 V system rail. Its ultra-low startup voltage of 0.65 V and adjustable output allow system designers to extend battery runtime while powering Bluetooth modules, microcontrollers, and small displays. The compact 8-pin DFN package minimizes PCB footprint for space-constrained wearable and IoT node designs.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | DFN-8 |
| Factory Lead Time | 6Weeks |
| 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-N8 |
| JESD-609 Code | e3 |
| 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 | SOLCC8,.11,20 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 575kHz |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline No-lead |
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 | Malaysia, Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range and minimum startup voltage does the MCP1640B-I/MC support?
The MCP1640B-I/MC operates from a nominal input of 1.2 V and can start up from as low as 0.65 V, with a UVLO threshold near 0.35 V. This makes it capable of boosting a deeply discharged single-cell alkaline battery to power 3.3 V microcontrollers or 5 V USB rails throughout nearly the full battery discharge curve.
How does the 500 kHz switching frequency of MCP1640B-I/MC affect the external inductor and capacitor sizes?
At 500 kHz, the MCP1640B-I/MC allows inductors in the 4.7 µH to 10 µH range and output capacitors around 10 µF, which are physically small and low-cost. Higher frequency reduces ripple current and component size compared to slower converters, directly benefiting compact IoT and wearable PCB layouts.
When is the MCP1640B-I/MC a better fit than a linear LDO for boosting a single-cell battery to 3.3 V?
An LDO cannot boost voltage—it can only step down. When a single-cell NiMH or alkaline battery discharges below 3.3 V, an LDO fails to maintain the output rail. The MCP1640B-I/MC synchronous boost converter continues to regulate a 3.3 V output even as the battery drops to 0.65 V, extending usable runtime by hundreds of mAh for sensors and wireless devices.
What output current can the MCP1640B-I/MC deliver, and does package choice affect thermal performance?
The MCP1640B-I/MC delivers up to 350 mA peak switch current, translating to practical output currents of 100 mA to 200 mA at 3.3 V from a 1.2 V input depending on efficiency. The 8-pin DFN package with exposed thermal pad provides lower junction-to-board thermal resistance compared to leaded packages, helping sustain continuous current in space-constrained designs without excessive heating.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.8100 | $0.81 |
| 25+ | $0.6800 | $17.00 |
| 100+ | $0.6100 | $61.00 |
| 1000+ | $0.5900 | $590.00 |
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