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Microchip Technology MCP1256T-E/MF
- Part No.:
- MCP1256T-E/MF
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP1256T-E/MF.pdf
- Description:
- IC REG CHG PUMP 3.3V 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1256T-E/MF 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 bias supply for PIC® MCUs and portable instrumentation.
For engineers reviewing the MCP1256T-E/MF datasheet, MCP1256T-E/MF pinout, MCP1256T-E/MF application, or MCP1256T-E/MF equivalent, key selection criteria include its SLEEP mode quiescent current (10 µA typ), PGOOD open-drain output, thermal shutdown threshold (160°C), soft-start timing (175 µs), and compatibility with ceramic flying capacitors (1 µF).
Technical Context
The MCP1256T-E/MF employs a switched-capacitor architecture 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 regulation uses a feedback amplifier with bandgap reference and bang-bang control during SLEEP mode.
It integrates dedicated logic for three operational states: normal boost (650 kHz oscillator active), SLEEP mode (pulse-skipping with regulated 3.3V output and increased ripple), and shutdown (0.25 µA IQ). The PGOOD pin monitors VOUT regulation with 7% dropout detection and 3% hysteresis, remaining high-impedance when SHDN is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.0% - ensures stable MCU core/bias rail without external feedback components. |
| Input Voltage Range | 1.8V to 3.6V - supports single Li-MnO₂ coin cells or two alkaline/NiMH cells directly. |
| Max Output Current | 100 mA at VIN ≥ 2.2V - sufficient for biasing multiple low-power peripherals or a PIC MCU with analog peripherals active. |
| Switching Frequency | 650 kHz (fixed) - enables compact ceramic capacitor filtering and avoids sensitive IF bands. |
| SLEEP Mode IQ | 10 µA typical - extends battery life in intermittently active systems while maintaining regulated 3.3V output. |
| PGOOD Threshold | Detects VOUT falling below 93% of nominal (≈3.07V) - provides reliable power-fail signaling for system reset or state save. |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Output Ripple | 20 mVPP at 100 mA - meets noise-sensitive analog sensor or RF front-end bias requirements with standard 10 µF COUT. |
Pinout & Package
Package: 10-lead 3 mm × 3 mm DFN (exposed pad), RoHS-compliant, thermal resistance θJA = 57°C/W on 4-layer board.
| 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 SHDN = low. |
| 2 (SLEEP) | Active-low SLEEP mode enable | Logic low enters pulse-skipping regulation mode; maintains 3.3V output with higher ripple and 10 µA IQ. |
| 3 (C2−) | Flying capacitor negative terminal | Connects to 1 µF ceramic capacitor (C2); part of charge-transfer path in 1.5x/2x pumping cycle. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to 1 µF ceramic capacitor (C1); forms dual flying cap network with C2 for efficient charge transfer. |
| 5 (VOUT) | Regulated 3.3V output | Delivers up to 100 mA; bypass with ≥10 µF ceramic capacitor to minimize ripple and support transient loads. |
| 6 (C2+) | Flying capacitor positive terminal | Completes second flying cap leg; switching between series/parallel configuration enables 1.5x vs. 2x boost modes. |
| 7 (VIN) | Main power input | Accepts 1.8V–3.6V; bypass with ≥10 µF ceramic capacitor near pin to suppress high-frequency switching noise. |
| 8 (C1−) | Flying capacitor negative terminal | Paired with C1+; critical for charge storage and transfer timing; layout symmetry minimizes EMI. |
| 9 (GND) | Power and signal reference | Must be low-inductance connection to PCB ground plane; ties all internal circuitry and flying cap return paths. |
| 10 (SHDN) | Active-low shutdown control | Drives device into 0.25 µA quiescent state; compatible with 1.8V logic; disables oscillator, PGOOD, and all switching. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge pump topology | Eliminates magnetic EMI and board space for inductors-ideal for compact, noise-sensitive portable designs. |
| Auto-switching 1.5x/2x boost modes | Optimizes efficiency across input range (e.g., 84.5% at 1.8V/10mA); no external mode selection required. |
| SLEEP mode with regulated output | Maintains 3.3V bias at 10 µA IQ-enables long idle periods in battery-powered sensors or meters without brownout. |
| Integrated soft-start and protection | 175 µs wake-up time + foldback short-circuit limit (150 mA typ) + thermal shutdown prevent inrush damage and thermal runaway. |
| Wide temperature operation | Specified from −40°C to +125°C junction-suitable for automotive cabin, industrial, and outdoor embedded applications. |
| Small DFN package | 3 mm × 3 mm footprint with exposed thermal pad reduces PCB area by >40% vs. MSOP, improving power density. |
Applications
| PIC® MCU Bias Supply | Portable Measurement Instrument |
|---|---|
Use Scenario: Powering a PIC16F or PIC18F microcontroller from a single CR2032 coin cell in a handheld multimeter. IC Role / Device Role / Timing Role: Provides clean, regulated 3.3V VDD rail with PGOOD signaling to ensure firmware executes only after stable voltage is established. Use Value: Enables full MCU functionality-including ADC, UART, and LCD driver-at ultra-low standby current, extending battery life beyond 2 years. | Use Scenario: Supplying analog front-end (AFE) and precision reference in a portable pH meter or dissolved oxygen sensor. IC Role / Device Role / Timing Role: Delivers low-noise 3.3V bias with <20 mVPP ripple to op-amps and 24-bit sigma-delta ADC, avoiding measurement drift. Use Value: Maintains ±0.01 pH accuracy over temperature by eliminating switching-induced offset in analog signal chain. |
| Home Automation Sensor Node | Pager Power Management |
Use Scenario: Powering Zigbee or BLE SoC + environmental sensors (temp/humidity/pressure) in a battery-operated smart thermostat. IC Role / Device Role / Timing Role: Supplies regulated 3.3V during active radio transmission and enters SLEEP mode during 99% idle time to conserve energy. Use Value: Achieves 5-year battery life using two AA cells by reducing average system current to sub-µA levels during sleep cycles. | Use Scenario: Providing primary bias for legacy pager ICs and LED display drivers operating from two NiMH cells. IC Role / Device Role / Timing Role: Generates stable 3.3V rail with fast wake-up (<200 µs) to support burst-mode paging reception and display updates. Use Value: Meets tight 100 ms response window for alert notifications while sustaining >1 week runtime per charge. |
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 and pinout, but in 10-pin MSOP package (θJA = 200°C/W vs. 57°C/W). | Less suitable for thermally constrained layouts or high ambient temperature environments due to higher thermal resistance. | Select MCP1256T-E/MS only if MSOP footprint is required for legacy board compatibility or hand-soldering preference. |
| TPS60403DBVR | 3.3V fixed-output charge pump (1.5x/2x), but lacks PGOOD and SLEEP mode; IQ = 120 µA in shutdown, no thermal shutdown. | Cannot provide regulated bias during low-power sleep or power-fail warning; limited for safety-critical or long-life battery apps. | Choose TPS60403DBVR only for cost-sensitive, non-critical applications where PGOOD and thermal protection are not required. |
Compared with MCP1256T-E/MS, the MCP1256T-E/MF offers superior thermal performance and smaller footprint; compared with TPS60403DBVR, it adds essential reliability features-PGOOD monitoring, SLEEP mode, and thermal shutdown-critical for robust portable designs.
Availability
MCP1256T-E/MF is available at Aetrix Electronics and suitable for portable measurement instruments, home automation sensor nodes, and PIC® MCU bias applications requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for MCP1256T-E/MF 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 devices, and interface ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MCP1256T-E/MF belongs to Microchip's charge pump DC/DC converter product line, designed specifically for low-EMI, inductorless voltage boosting in space-constrained, battery-powered systems such as medical sensors and portable instrumentation.
FAQ
What is the function of the SLEEP pin on the MCP1256T-E/MF?
The SLEEP pin on the MCP1256T-E/MF is an active-low input that places the device into SLEEP mode when driven low. In this mode, the MCP1256T-E/MF maintains regulated 3.3V output while reducing quiescent current to 10 µA (typical), enabling extended battery life in intermittently active systems. SLEEP mode uses pulse-skipping regulation, resulting in higher output voltage ripple-up to 60 mVPP-but preserves MCU or sensor bias integrity without requiring full shutdown and restart.
Does the MCP1256T-E/MF require external inductors?
No, the MCP1256T-E/MF does not require external inductors. It uses a switched-capacitor (charge pump) architecture with two 1 µF ceramic flying capacitors (C1 and C2) and input/output bypass capacitors. This inductorless design eliminates magnetic EMI, reduces solution size, and simplifies layout-making the MCP1256T-E/MF ideal for compact, noise-sensitive applications like portable medical devices and handheld test equipment.
How does the PGOOD output behave during startup and fault conditions for the MCP1256T-E/MF?
The PGOOD output on the MCP1256T-E/MF is an open-drain signal that goes high-impedance when VOUT reaches regulation (within 3% of 3.3V) and remains high-Z until VOUT drops below 93% of nominal (≈3.07V). During startup, PGOOD transitions from high-Z to pulled-low only after VOUT stabilizes-providing a reliable power-good indication. If SHDN is asserted, PGOOD returns to high-Z immediately. Glitch immunity prevents false triggering for transients shorter than 200 µs.
What is the maximum output current capability of the MCP1256T-E/MF across its input voltage range?
The MCP1256T-E/MF delivers up to 100 mA output current when VIN ≥ 2.2V, 70 mA when VIN is 2.0V–2.2V, and 30 mA when VIN is 1.8V–2.0V. This stepped current capability reflects charge pump efficiency dependence on input voltage headroom. At VIN = 2.4V and IOUT = 100 mA, efficiency is 67.5%; at VIN = 3.0V and same load, it improves to 71.6%. Designers must verify load current versus VIN in their specific application to ensure regulation margin.
Can the MCP1256T-E/MF operate reliably at +125°C junction temperature?
Yes, the MCP1256T-E/MF is fully specified and characterized over a junction temperature range of −40°C to +125°C. It incorporates thermal shutdown that activates at 160°C (with 15°C hysteresis), protecting the device during overload or poor thermal design. When used within recommended PCB layout guidelines-including proper thermal pad soldering and copper pour-the MCP1256T-E/MF sustains continuous operation at +125°C ambient in typical applications such as automotive cabin sensors or industrial controllers.
MCP1256T-E/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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-DFN (3x3)
MCP1256T-E/MF FAQ
1.How can I place an order for MCP1256T-E/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1256T-E/MF 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/MF reliable?
The price and inventory of MCP1256T-E/MF 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/MF is usually 5 days.
3.What payment methods are accepted for MCP1256T-E/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1256T-E/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1256T-E/MF?
MCP1256T-E/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1256T-E/MF 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/MF?
For technical support, including MCP1256T-E/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1256T-E/MF requirements.
6.How does Aetrix verify that MCP1256T-E/MF is sourced from the original manufacturer or authorized distributors?
All MCP1256T-E/MF 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/MF meets industry standards.
7.What is the process for return or replacement of MCP1256T-E/MF?
All MCP1256T-E/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP1256T-E/MF, 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/MF part is unused and in its original packaging.
Return procedure for MCP1256T-E/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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