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Microchip Technology MCP1256T-E/UN
- Part No.:
- MCP1256T-E/UN
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1256T-E/UN.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1256T-E/UN from Microchip Technology is a 10-pin DFN-packaged, inductorless 1.5x/2x charge pump DC/DC converter delivering a regulated 3.3V output from 1.8V–3.6V input, with ±3.0% output accuracy, 100 mA max output current, and 650 kHz fixed switching frequency. It serves as a low-noise, compact power supply for PIC® MCU bias and portable measurement instruments.
For engineers reviewing the MCP1256T-E/UN datasheet, MCP1256T-E/UN pinout, MCP1256T-E/UN application, or MCP1256T-E/UN equivalent, key selection criteria include its SLEEP mode quiescent current (10 µA typ), PGOOD open-drain output, thermal shutdown threshold (160°C), 3 mm × 3 mm DFN package, and compatibility with ceramic flying capacitors (1 µF).
Technical Context
The MCP1256T-E/UN implements a switched-capacitor charge pump with automatic 1.5x/2x mode selection based on input voltage and load to maximize efficiency-reaching 84.5% at VIN = 1.8V, IOUT = 10 mA. Its internal 650 kHz oscillator enables compact filtering and avoids sensitive IF bands.
It features a dedicated SLEEP mode (active-low SLEEP pin) that maintains regulation while reducing quiescent current to 10 µA typical, plus a PGOOD open-drain output that asserts low when VOUT falls below 93% of nominal (7% drop), with 110 mV hysteresis and glitch immunity for <200 µs transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V, ±3.0% accuracy over -40°C to +125°C ensures stable bias for 3.3V logic and microcontrollers. |
| Input Voltage Range | 1.8V to 3.6V supports 2-cell alkaline/Ni-MH or single lithium coin cell operation without external regulators. |
| Max Output Current | 100 mA at VIN ≥ 2.2V enables direct powering of small MCUs, sensors, and RF modules. |
| Switching Frequency | 650 kHz fixed frequency simplifies EMI filtering and avoids interference with common IF bands (e.g., 433 MHz, 868 MHz receivers). |
| SLEEP Mode IQ | 10 µA typical quiescent current extends battery life in intermittently active portable devices. |
| PGOOD Threshold | Asserts low when VOUT drops below 93% of 3.3V (≈3.07V), enabling reliable power-fail detection for system reset or brown-out handling. |
| Thermal Shutdown | Triggers at 160°C junction temperature with 15°C hysteresis, protecting against sustained overload or poor PCB thermal design. |
| Package | 10-lead 3 mm × 3 mm DFN provides compact footprint and 57°C/W θJA for high-density portable layouts. |
Pinout & Package
Package: 10-lead 3 mm × 3 mm DFN (exposed pad), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain power-good indicator | Signals regulation status; requires external pull-up to VOUT; high-Z when in regulation or during SHDN/BYPASS. |
| 2 (SLEEP) | Active-low SLEEP mode control | Pulls low to enter ultra-low-IQ regulation mode; maintains 3.3V output with increased ripple (40–60 mVPP). |
| 3 (C2–) | Flying capacitor negative terminal | Connects to 1 µF ceramic flying cap C2; critical for charge transfer phase in 1.5x/2x pumping. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to 1 µF ceramic flying cap C1; forms charge-transfer network with C1–, C2+, C2–. |
| 5 (VOUT) | Regulated 3.3V output | Delivers up to 100 mA; bypass with ≥10 µF ceramic capacitor to minimize ripple (<20 mVPP at 100 mA). |
| 6 (C2+) | Flying capacitor positive terminal | Completes second flying capacitor path; must match C1 value and placement for balanced charge transfer. |
| 7 (VIN) | Main input supply (1.8V–3.6V) | Accepts battery or low-voltage rail; bypass with ≥10 µF ceramic capacitor near pin to suppress input ripple. |
| 8 (C1–) | Flying capacitor negative terminal | Paired with C1+; layout symmetry with C2± minimizes parasitic inductance and improves efficiency. |
| 9 (GND) | Power and signal reference | Must connect to low-impedance ground plane; shared return for VIN, VOUT, and flying caps. |
| 10 (SHDN) | Active-low shutdown control | Pulls low to disable all circuitry; reduces IQ to 0.25 µA typical; compatible with 1.8V logic. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge pump architecture | Eliminates magnetic components, reducing EMI, board area, and BOM cost vs. inductive boost converters. |
| Auto-switching 1.5x/2x boost modes | Optimizes efficiency across input range (e.g., 84.5% at VIN=1.8V, IOUT=10mA; 69.7% at VIN=2.4V, IOUT=100mA). |
| SLEEP mode with regulated output | Maintains 3.3V bias at 10 µA IQ-ideal for wake-on-interrupt systems where peripherals must stay powered. |
| Integrated soft-start and protection | 175 µs VOUT wake-up time; foldback short-circuit limit (150 mA typ); thermal shutdown with 15°C hysteresis. |
| Low-noise 650 kHz operation | Enables use of small ceramic filters; output ripple ≤20 mVPP at 100 mA load with 10 µF COUT. |
| Small 3 mm × 3 mm DFN package | Supports high-density portable designs; 57°C/W θJA enables operation up to +125°C junction temperature. |
Applications
| Portable Measurement Instruments | PIC® MCU Bias Supply |
|---|---|
Use Scenario: Handheld multimeters and environmental sensors operating from two AA batteries (2.4–3.2V nominal) requiring clean, stable 3.3V for ADC reference and digital logic. IC Role / Device Role / Timing Role: Primary regulated 3.3V power source with PGOOD monitoring to ensure ADC accuracy before sampling. Use Value: Delivers <20 mVPP ripple at full load and maintains regulation down to 1.8V input, extending usable battery range by ~15% vs. linear regulators. | Use Scenario: Low-power PIC® microcontroller systems (e.g., PIC16F/LF series) powered by coin cells or alkaline batteries in home automation nodes. IC Role / Device Role / Timing Role: Dedicated bias supply enabling MCU deep-sleep modes while keeping RTC and wake-up comparators active. Use Value: SLEEP mode draws only 10 µA IQ-reducing system standby current by >90% compared to standard boost operation. |
| Home Automation Products | Pagers |
Use Scenario: Battery-powered smart switches and wireless sensor hubs using BLE or Sub-GHz radios, needing low-noise 3.3V for RF front-end and MCU. IC Role / Device Role / Timing Role: Noise-sensitive power rail generator; 650 kHz switching avoids interference with 2.4 GHz or 868 MHz ISM bands. Use Value: Ceramic-only design eliminates inductor EMI; PGOOD enables radio TX enable sequencing after stable VOUT is confirmed. | Use Scenario: Legacy alphanumeric pagers powered by single lithium MnO₂ coin cells (3.0V nominal), requiring regulated 3.3V for display driver and baseband IC. IC Role / Device Role / Timing Role: Input-voltage-agnostic step-up converter supporting full discharge curve (3.0V → 1.8V) without brown-out resets. Use Value: Operates down to 1.8V VIN with 100 mA capability at 2.2V+, ensuring consistent display contrast and tone generation until battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1256T-E/MS | Same electrical specs; packaged in 10-pin MSOP (3 mm × 4.9 mm) instead of 3 mm × 3 mm DFN. | Requires PCB layout change; higher θJA (200°C/W) limits high-temperature performance. | Select for legacy MSOP-compatible designs or prototyping with through-hole adapters. |
| TPS60403DBVR | 3.3V fixed-output, 60 mA max, 1.8V–5.5V input; no SLEEP mode; PGOOD not available; 500 kHz switching. | Lacks regulation monitoring and ultra-low-IQ sleep; suitable only for simpler, lower-current loads. | Choose when cost is primary constraint and PGOOD/SLEEP are unnecessary. |
Compared with MCP1256T-E/MS and TPS60403DBVR, the MCP1256T-E/UN offers superior thermal performance (57°C/W vs. 200°C/W), integrated PGOOD for system reliability, and SLEEP mode for extended battery life-making it optimal for space-constrained, high-reliability portable designs.
Availability
MCP1256T-E/UN is available at Aetrix Electronics and suitable for portable measurement instruments, PIC® MCU bias supplies, home automation products, and pager designs requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MCP1256T-E/UN 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 microcontroller, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1256T-E/UN belongs to Microchip's MCP125x family of inductorless charge pumps, designed specifically for compact, low-EMI, battery-powered applications where size, noise, and efficiency outweigh cost sensitivity.
FAQ
What is the maximum output current capability of the MCP1256T-E/UN under typical conditions?
The MCP1256T-E/UN delivers up to 100 mA of continuous output current when the input voltage is ≥2.2V. At lower inputs (1.8V–2.0V), the max output current is 30 mA; at 2.0V–2.2V, it is 70 mA. These limits reflect internal charge-pump strength and thermal constraints-not derated values-and are validated across –40°C to +125°C.
Does the MCP1256T-E/UN require external inductors?
No, the MCP1256T-E/UN is an inductorless charge pump DC/DC converter. It uses two 1 µF ceramic flying capacitors (C1 and C2) and input/output ceramic capacitors (CIN, COUT) to achieve voltage boosting. This eliminates magnetic components, reducing EMI, board area, and cost versus inductive boost topologies.
How does the PGOOD pin function on the MCP1256T-E/UN?
The PGOOD pin on the MCP1256T-E/UN is an open-drain output that remains high-impedance when VOUT is within regulation (≥93% of 3.3V). It pulls low if VOUT drops below ≈3.07V, with 110 mV hysteresis and glitch immunity for transients <200 µs. A 10 kΩ–1 MΩ pull-up to VOUT is required for logic-level signaling.
What is the purpose of the SLEEP pin on the MCP1256T-E/UN?
The SLEEP pin on the MCP1256T-E/UN is an active-low control that places the device into a regulated low-power state. In SLEEP mode, the MCP1256T-E/UN maintains 3.3V output while reducing quiescent current to 10 µA typical-ideal for battery-powered systems needing persistent bias during MCU sleep cycles.
Can the MCP1256T-E/UN operate across the full industrial temperature range?
Yes, the MCP1256T-E/UN is fully characterized and guaranteed to operate from –40°C to +125°C junction temperature. Its thermal shutdown activates at 160°C with 15°C hysteresis, and all electrical specifications-including output accuracy (±3.0%), efficiency, and PGOOD threshold-are validated across this range.
MCP1256T-E/UN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
MCP1256T-E/UN FAQ
1.How can I place an order for MCP1256T-E/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1256T-E/UN 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 MCP1256T-E/UN reliable?
The price and inventory of MCP1256T-E/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1256T-E/UN is usually 5 days.
3.What payment methods are accepted for MCP1256T-E/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1256T-E/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1256T-E/UN?
MCP1256T-E/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1256T-E/UN 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 MCP1256T-E/UN?
For technical support, including MCP1256T-E/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1256T-E/UN requirements.
6.How does Aetrix verify that MCP1256T-E/UN is sourced from the original manufacturer or authorized distributors?
All MCP1256T-E/UN 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 MCP1256T-E/UN meets industry standards.
7.What is the process for return or replacement of MCP1256T-E/UN?
All MCP1256T-E/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP1256T-E/UN, 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 MCP1256T-E/UN part is unused and in its original packaging.
Return procedure for MCP1256T-E/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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