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Microchip Technology MCP1258T-E/UN
- Part No.:
- MCP1258T-E/UN
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1258T-E/UN.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
MCP1258T-E/UN from Microchip Technology is a 10-pin DFN-packaged, inductorless 1.5x/2x charge pump DC/DC converter generating a regulated 3.3V output from 1.8V–3.6V input. It delivers up to 100 mA output current, maintains ±3.0% output voltage accuracy, and features BYPASS mode for direct VIN-to-VOUT connection-enabling ultra-low-power biasing of real-time clocks or microcontrollers in battery-powered instrumentation.
For engineers reviewing the MCP1258T-E/UN datasheet, MCP1258T-E/UN pinout, MCP1258T-E/UN application, or MCP1258T-E/UN equivalent, this page provides verified technical context, validated pin functions, confirmed BYPASS-mode impedance (1.5 Ω), thermal shutdown threshold (160°C), and application-specific design meaning for portable measurement instruments and home automation systems.
Technical Context
The MCP1258T-E/UN employs a switched-capacitor architecture with automatic 1.5x/2x mode selection based on input voltage and load, using two 1 µF flying capacitors (C1, C2) and fixed 650 kHz internal oscillator timing. Regulation is achieved via feedback amplifier and bandgap reference, with output ripple held to ≤20 mVPP at 100 mA.
BYPASS mode activates when the active-low BYPASS pin is asserted, disconnecting internal switching circuitry and establishing a low-impedance path (1.5 Ω typical) between VIN and VOUT while reducing quiescent current to 0.25 µA. PGOOD open-drain output monitors regulation status with 7% undervoltage threshold and 3% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V - provides stable bias for 3.3V logic, PIC® MCUs, and RTCs without external feedback components. |
| Input Voltage Range | 1.8 V to 3.6 V - supports 2-cell alkaline/Ni-MH batteries and single Li-MnO₂ coin cells directly. |
| Max Output Current | 100 mA at VIN ≥ 2.2 V - sufficient to power multiple low-power peripherals simultaneously in portable instruments. |
| Output Voltage Accuracy | ±3.0 % - ensures reliable operation of 3.3V I/O interfaces and ADC references across temperature (-40°C to +125°C). |
| Switching Frequency | 650 kHz - enables compact ceramic filtering and avoids sensitive IF bands in RF-sensitive applications. |
| BYPASS Mode Impedance | 1.5 Ω - minimizes voltage drop during bypass, preserving system functionality with <10 mV drop at 10 mA load. |
| Thermal Shutdown Threshold | 160 °C - protects against sustained overload or poor PCB thermal design without requiring external thermal management. |
| Shutdown Quiescent Current | 0.25 µA typical - extends shelf life and operational runtime in always-on, intermittently active devices like smart sensors. |
Pinout & Package
Package: 10-lead 3 mm × 3 mm DFN (exposed pad), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGOOD) | Open-drain power-good indicator | Asserts low when VOUT falls >7% below 3.3V; high-impedance during BYPASS or SHDN - used for system power sequencing and fault detection. |
| 2 (BYPASS) | Active-low BYPASS mode control | Pulling low connects VIN directly to VOUT with 1.5 Ω path; disables all internal switching - enables zero-consumption biasing of downstream circuits. |
| 3 (C2–) | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic flying capacitor C2; critical for charge transfer integrity in both 1.5x and 2x modes. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic flying capacitor C1; forms charge-transfer network with C2 and internal switches S1–S7. |
| 5 (VOUT) | Regulated 3.3V output | Delivers up to 100 mA; requires ≥2.2 µF ceramic bypass to GND - serves as primary supply rail for MCU cores and analog peripherals. |
| 6 (C2+) | Flying capacitor positive terminal | Completes second flying capacitor path; paired with C2– to store and transfer charge during 1.5x/2x phase transitions. |
| 7 (VIN) | Main input supply (1.8–3.6 V) | Accepts battery or regulated source; requires ≥1 µF local bypass - defines operating envelope and efficiency profile. |
| 8 (C1–) | Flying capacitor negative terminal | Completes first flying capacitor path; works with C1+ to enable bidirectional charge pumping under oscillator control. |
| 9 (GND) | Power and signal reference | Low-impedance return path for all internal currents and flying capacitor charge/discharge loops - must be solidly connected to PCB ground plane. |
| 10 (SHDN) | Active-low shutdown control | Pulling low disables oscillator, switches, and regulation - reduces IQ to 0.25 µA and places PGOOD in high-Z state. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge pump topology | Eliminates EMI-prone magnetics and saves board space - ideal for compact, noise-sensitive portable instruments. |
| Auto-switching 1.5x / 2x boost modes | Optimizes efficiency across input range (e.g., 84.5% at VIN=1.8V/IOUT=10mA); avoids manual mode selection or external control logic. |
| BYPASS mode with 1.5 Ω path | Enables near-zero static power consumption while maintaining system bias - extends battery life in always-on sensor nodes. |
| Integrated soft-start and protection | 175 µs wake-up time, 150 mA short-circuit limit, and 160°C thermal shutdown prevent inrush damage and ensure robust field operation. |
| Wide temperature operation | -40°C to +125°C junction range - qualified for industrial and automotive-adjacent environments including home automation hubs. |
| Small 3 mm × 3 mm DFN package | 10-pin footprint with exposed thermal pad - supports high-density layouts and efficient heat dissipation in thermally constrained enclosures. |
Applications
| Portable Measurement Instruments | Home Automation Products |
|---|---|
Use Scenario: Handheld multimeters and environmental sensors powered by coin-cell or AA batteries requiring long shelf life and stable 3.3V bias. IC Role / Device Role / Timing Role: Regulated 3.3V supply generator with BYPASS mode enabling zero-current standby for wake-on-event architectures. Use Value: Extends battery life beyond 5 years in sleep mode while ensuring fast (<150 µs) wake-up to full regulation for measurement cycles. |
Use Scenario: Smart thermostats and wireless light controllers using 2-cell alkaline batteries with intermittent MCU activity. IC Role / Device Role / Timing Role: Primary 3.3V power source with integrated PGOOD for safe MCU boot sequencing and brown-out monitoring. Use Value: Eliminates need for discrete LDO + supervisor IC, reducing BOM count and PCB area by >30% versus linear solutions. |
| PIC® MCU Bias Supply | Real-Time Clock (RTC) Backup |
Use Scenario: Low-power PIC® microcontrollers in battery-backed data loggers requiring clean, accurate 3.3V core voltage. IC Role / Device Role / Timing Role: Main VDD supply with ±3.0% accuracy and <20 mVPP ripple - meets PIC16F/LF15xx VDD tolerance specs. Use Value: Guarantees reliable flash programming, ADC linearity, and oscillator stability without external filtering or trimming. |
Use Scenario: RTC modules in security panels and energy monitors needing continuous bias during main power loss. IC Role / Device Role / Timing Role: BYPASS-mode conductor linking backup coin cell directly to RTC VDD pin while disabling all internal circuitry. Use Value: Reduces backup current to <100 nA (excluding RTC draw), enabling >10-year coin-cell lifetime with no regulation overhead. |
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 |
|---|---|---|---|
| MCP1258T-E/MS | Same electrical specs and pinout, but in 10-pin MSOP package (200°C/W θJA vs. 57°C/W for DFN) | Less effective thermal performance in high-ambient or high-load scenarios; requires larger PCB area | Select for legacy MSOP-compatible designs or where DFN reflow capability is unavailable. |
| TPS60403DBVR | 3.3V fixed-output, 60 mA max, 1 µA shutdown IQ, no BYPASS mode; uses different flying cap configuration | Lacks direct VIN-to-VOUT bypass path - cannot support zero-quiescent-bias RTC backup use case | Choose only if lower output current suffices and BYPASS functionality is not required. |
Compared with MCP1258T-E/MS and TPS60403DBVR, the MCP1258T-E/UN offers superior thermal performance in its DFN package and unique BYPASS mode for true zero-consumption biasing-making it the only option among the three that fully supports long-life RTC backup and high-efficiency portable instrumentation.
Availability
MCP1258T-E/UN is available at Aetrix Electronics and suitable for portable measurement instruments, home automation products, PIC® MCU bias supplies, and real-time clock backup systems requiring stable component supply, extended temperature operation, and proven charge pump reliability.
Supply support for MCP1258T-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, FPGA, and mixed-signal semiconductors headquartered in Chandler, Arizona.
The MCP1256/7/8/9 product line was designed specifically for compact, low-noise, inductorless DC/DC conversion in battery-powered portable electronics - emphasizing BYPASS/SLEEP modes, wide input range, and DFN/MSOP packaging for space-constrained applications.
FAQ
What is the function of the BYPASS pin on the MCP1258T-E/UN?
The BYPASS pin on the MCP1258T-E/UN is an active-low control input that, when pulled low, disables all internal switching circuitry and establishes a low-impedance (1.5 Ω typical) conductive path between VIN and VOUT. This allows the MCP1258T-E/UN to deliver unregulated input voltage to downstream loads with virtually zero quiescent current - a key feature for extending battery life in RTC backup and always-on sensor applications. The MCP1258T-E/UN remains fully functional after BYPASS deactivation.
Does the MCP1258T-E/UN require external resistors for output voltage setting?
No, the MCP1258T-E/UN does not require external resistors for output voltage setting because it features a factory-trimmed, fixed 3.3V output. The regulation is implemented internally using a precision bandgap reference and feedback amplifier, delivering ±3.0% accuracy across temperature and load. This eliminates resistor placement, trimming, and associated layout sensitivity - simplifying design and improving long-term stability compared to adjustable charge pumps.
What is the maximum output current capability of the MCP1258T-E/UN at 2.4V input?
At 2.4V input, the MCP1258T-E/UN delivers up to 100 mA of continuous output current while maintaining regulation and ≤20 mVPP output ripple. This performance is confirmed in the DS21989B datasheet under "DC CHARACTERISTICS" for VIN = 2.2V to 3.6V. The device sustains this current with 67.5% efficiency at 2.4V/100mA and incorporates foldback short-circuit protection limiting peak output to 150 mA typical - ensuring safe operation under transient overloads.
How does the PGOOD output behave during BYPASS mode on the MCP1258T-E/UN?
During BYPASS mode on the MCP1258T-E/UN, the PGOOD output is placed in a high-impedance (Hi-Z) state - it neither sinks nor sources current. This behavior is explicitly defined in the datasheet: "PGOOD is high impedance when SHDN is low or when BYPASS is low (MCP1258)." Therefore, external pull-up circuitry must be disconnected or disabled during BYPASS operation to avoid unintended loading or logic conflicts. The MCP1258T-E/UN resumes normal PGOOD monitoring only after BYPASS is deasserted and regulation is re-established.
Can the MCP1258T-E/UN operate reliably at +125°C junction temperature?
Yes, the MCP1258T-E/UN is fully characterized and guaranteed to operate reliably across a junction temperature range of -40°C to +125°C, as stated in the "Temperature Specifications" section of DS21989B. Its thermal shutdown activates at 160°C with 15°C hysteresis, providing margin above the rated max. In the 3 mm × 3 mm DFN package, θJA is 57°C/W - enabling sustained +125°C operation with appropriate PCB copper area and airflow, making the MCP1258T-E/UN suitable for industrial and automotive-adjacent environments.
MCP1258T-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
MCP1258T-E/UN FAQ
1.How can I place an order for MCP1258T-E/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1258T-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 MCP1258T-E/UN reliable?
The price and inventory of MCP1258T-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 MCP1258T-E/UN is usually 5 days.
3.What payment methods are accepted for MCP1258T-E/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1258T-E/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1258T-E/UN?
MCP1258T-E/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1258T-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 MCP1258T-E/UN?
For technical support, including MCP1258T-E/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1258T-E/UN requirements.
6.How does Aetrix verify that MCP1258T-E/UN is sourced from the original manufacturer or authorized distributors?
All MCP1258T-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 MCP1258T-E/UN meets industry standards.
7.What is the process for return or replacement of MCP1258T-E/UN?
All MCP1258T-E/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP1258T-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 MCP1258T-E/UN part is unused and in its original packaging.
Return procedure for MCP1258T-E/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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