MCP1256-E/UN Microchip Power Supply (Small Outline Packages) In Stock
MCP1256-E/UN is a regulated charge pump DC/DC converter from Microchip delivering a fixed 3.3 V output at up to 100 mA with a 650 kHz switching frequency, accepting 1.8 V to 3.6 V input, housed in a 10-pin MSOP package for portable and battery-powered designs.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 10
- Lifecycle
- ACTIVE
- Datasheet
- MCP1256-E/UN Datasheet PDF
- Category
- Power Supply
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Regulated 3.3 V output at up to 100 mA from a 1.8 V to 3.6 V input supply
- 650 kHz switching frequency minimises external capacitor size and reduces audible noise
- Switched-capacitor (charge pump) topology eliminates the inductor for compact BOM
- Input voltage as low as 1.8 V enables single Li-ion cell step-up operation
- 10-pin MSOP package for space-efficient SMT placement on portable boards
- REACH-compliant and lead-free (Pbfree Yes) for regulatory-sensitive designs
- Low shutdown current for battery conservation in duty-cycled applications
Applications
MCP1256-E/UN is designed for portable consumer electronics, wireless sensor nodes, and handheld medical devices where a 3.3 V regulated rail must be generated from a single Li-ion or two-cell alkaline battery without an inductor. Its inductor-free charge pump architecture is especially advantageous in RF-sensitive applications such as Bluetooth and Zigbee modules, where magnetic field emissions from inductive converters can interfere with the radio receiver.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | MSOP-10 |
| Reach Compliance Code | Compliant |
| Factory Lead Time | 10Weeks |
| YTEOL | 9.81 |
| Analog IC - Other Type | SWITCHED CAPACITOR REGULATOR |
| Input Voltage-Max | 3.6V |
| Input Voltage-Min | 1.8V |
| Input Voltage-Nom | 2V |
| JESD-30 Code | S-PDSO-G10 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.1A |
| Output Voltage-Max | 6.501V |
| Output Voltage-Min | 3.201V |
| Output Voltage-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP10,.19,20 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Surface Mount | YES |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 650kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
Why choose a charge pump topology like MCP1256-E/UN instead of an inductor-based boost converter for a 3.3 V rail?
Charge pump converters such as MCP1256-E/UN use only external capacitors and eliminate the magnetic inductor, which reduces EMI radiation and avoids the 3 mm to 5 mm height penalty of a power inductor. This is advantageous in flat wearable designs and RF modules where a boost converter's switching field could desensitise a 2.4 GHz receiver operating nearby.
What output current and switching frequency does MCP1256-E/UN deliver for digital load requirements?
MCP1256-E/UN provides up to 100 mA of regulated 3.3 V output, which is sufficient for a low-power MCU, an 802.15.4 radio, and associated logic, while its 650 kHz switching frequency keeps the flying capacitors small — typically 1 µF ceramic capacitors — and moves noise well above the audible range in battery-powered portable designs.
Does MCP1256-E/UN meet REACH and RoHS requirements for regulated consumer and industrial end products?
Yes, MCP1256-E/UN is marked REACH Compliant and carries a Pbfree code of Yes, confirming it satisfies both EU RoHS restricted substance requirements and REACH SVHC obligations. These certifications support product declarations of conformity for CE-marked consumer electronics and industrial equipment sold in European and other regulated markets.
What input voltage range does MCP1256-E/UN accept, and can it operate directly from a partially discharged Li-ion cell?
MCP1256-E/UN accepts input voltages from 1.8 V to 3.6 V, covering the full discharge curve of a single Li-ion cell from 4.2 V (too high — a pre-regulator or protection circuit is needed) down to 2.7 V or lower, and it can also work from two AA alkaline cells in series as their combined voltage drops toward 2 V at end of life, extending effective battery runtime.
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