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Microchip Technology MCP1258-E/UN
- Part No.:
- MCP1258-E/UN
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1258-E/UN.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
MCP1258-E/UN from Microchip Technology is a fixed-output, inductorless 1.5x/2x charge pump DC/DC converter delivering regulated 3.3V at up to 100 mA from 1.8V–3.6V input. It features BYPASS mode (input-to-output direct connection), 650 kHz switching frequency, ±3.0% output voltage accuracy, and 20 mVPP ripple at full load-designed for battery-powered microcontroller biasing in portable instrumentation.
For engineers reviewing the MCP1258-E/UN datasheet, MCP1258-E/UN pinout, MCP1258-E/UN application, or MCP1258-E/UN equivalent, key selection criteria include BYPASS-mode impedance (1.5 Ω), shutdown current (0.25 µA typ), thermal shutdown threshold (160°C), PGOOD logic interface compatibility, and DFN/MSOP package options for space-constrained designs.
Technical Context
The MCP1258-E/UN uses switched-capacitor topology with autonomous 1.5x/2x mode selection based on input-output voltage ratio, eliminating inductors while maintaining regulation. Its internal 650 kHz oscillator drives four-phase charge-transfer cycles across two flying capacitors (C1, C2), with feedback-controlled gate drivers managing S1–S7 switches per TABLE 1.
BYPASS mode disables all internal circuitry except the low-impedance pass path between VIN and VOUT, reducing quiescent current to 0.25 µA and enabling real-time MCU bias during ultra-low-power sleep states. PGOOD provides open-drain out-of-regulation detection with 7% falling threshold and 3% hysteresis, active only when SHDN and BYPASS are high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.0% - ensures stable bias for 3.3V logic and analog peripherals without external feedback components. |
| Input Voltage Range | 1.8V to 3.6V - supports 2-cell alkaline/NiMH or single Li-MnO₂ coin cells without under-voltage lockout circuitry. |
| Max Output Current | 100 mA at VIN ≥ 2.2V - sufficient to power PIC® MCUs, RTCs, and low-power sensors in portable systems. |
| BYPASS Impedance | 1.5 Ω typical at VIN = 2.4V - enables <15 mV drop at 10 mA load, preserving system voltage integrity during bypass operation. |
| Shutdown Current | 0.25 µA typical - extends battery life in storage or deep-sleep modes where device bias must persist with minimal drain. |
| Switching Frequency | 650 kHz fixed - avoids IF interference bands and simplifies EMI filtering with small ceramic capacitors only. |
| Thermal Shutdown | 160°C threshold with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring. |
Pinout & Package
Available in 10-pin 3 mm × 3 mm DFN and 10-pin MSOP packages. Both share identical pin numbering and function mapping per DS21989B-page 11.
| 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 or fault reporting. |
| 2 (BYPASS) | Active-low BYPASS mode enable | Pulls VIN directly to VOUT when low; disables all internal circuitry - enables zero-quiescent-bias operation for always-on peripherals. |
| 3 (C2−) | Flying capacitor negative terminal | Connects to 1 µF ceramic capacitor (C2) - forms half of dual flying-capacitor charge-transfer network. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to 1 µF ceramic capacitor (C1) - completes charge-pump capacitor pair with C2 for efficient energy transfer. |
| 5 (VOUT) | Regulated 3.3V output | Delivers up to 100 mA; requires ≥2.2 µF ceramic bypass to GND - serves as primary power rail for downstream ICs. |
| 6 (C2+) | Flying capacitor positive terminal | Second positive node for C2 - enables series/parallel reconfiguration of flying caps for 1.5x or 2x boost operation. |
| 7 (VIN) | Main input supply (1.8–3.6V) | Accepts battery or regulated source; requires ≥1 µF ceramic bypass - defines operating range and efficiency envelope. |
| 8 (C1−) | Flying capacitor negative terminal | Completes C1 connection - critical for charge-phase timing and ripple suppression. |
| 9 (GND) | Power and signal reference | Common return for all capacitors and load - must be low-inductance plane to minimize switching noise coupling. |
| 10 (SHDN) | Active-low shutdown control | Reduces IQ to 0.25 µA when low; compatible with 1.8V logic - enables system-level power gating. |
Key Features
| Feature | Design Value |
|---|---|
| BYPASS Mode | Direct VIN-to-VOUT connection with 1.5 Ω typical impedance - eliminates regulator overhead current while maintaining peripheral bias during MCU sleep. |
| Auto 1.5x/2x Mode Switching | Dynamic selection based on VIN/VOUT ratio - maximizes efficiency across 1.8–3.6V input range without manual configuration or external control. |
| Integrated Soft-Start | 175 µs typical VOUT rise time from shutdown or BYPASS release - prevents inrush current damage to input source and output capacitors. |
| Thermal + Short-Circuit Protection | 160°C shutdown with 15°C hysteresis and 150 mA foldback limit - ensures robust operation under transient overloads or PCB thermal constraints. |
| Low-Noise Fixed-Frequency Operation | 650 kHz clock with minimal EMI - avoids sensitive RF/IF bands and enables predictable filter design using only ceramic capacitors. |
Applications
| Portable Measurement Instruments | Home Automation Sensors |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by single Li-MnO₂ coin cells requiring stable 3.3V bias for ADCs and displays during intermittent measurement bursts. IC Role / Device Role / Timing Role: Regulated 3.3V charge pump with BYPASS mode enabling zero-current MCU wake-up from deep sleep while preserving sensor bias. Use Value: Extends battery life beyond 5 years by eliminating quiescent regulator current during 99% idle time, with <150 µs wake-up latency. | Use Scenario: Wireless temperature/humidity nodes in smart thermostats using 2×AA alkaline batteries, where long shelf life and cold-temperature operation (-40°C) are critical. IC Role / Device Role / Timing Role: Primary 3.3V power source for RF transceiver and microcontroller, leveraging 1.8V minimum input support and -40°C to +125°C junction rating. Use Value: Delivers full 100 mA output down to 2.2V input, enabling reliable operation until battery depletion at ~1.8V, with no inductor-induced EMI affecting wireless reception. |
| PIC® MCU Bias Supply | Real-Time Clock (RTC) Backup |
Use Scenario: Embedded control modules in industrial controllers where PIC® MCUs require clean, regulated 3.3V from varying battery or supercapacitor sources. IC Role / Device Role / Timing Role: Primary DC/DC converter with PGOOD monitoring for safe MCU boot and brown-out detection. Use Value: ±3.0% output accuracy and 20 mVPP ripple ensure deterministic digital timing and analog reference stability across temperature and load. | Use Scenario: Battery-backed RTC circuits in medical devices needing continuous timekeeping during main power loss or deep sleep. IC Role / Device Role / Timing Role: BYPASS-enabled bias path that connects backup coin cell directly to RTC VDD while disabling all other circuitry. Use Value: Reduces RTC supply current to <100 nA effective (including BYPASS FET RDS(on)), extending 2032 coin cell life to >10 years. |
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 |
|---|---|---|---|
| MAX680ESA+ | Fixed 5V output; no BYPASS mode; 100 kHz switching; requires external capacitors only (no flying cap polarity sensitivity) | Designed for higher-voltage logic rails; lacks low-impedance bypass path for ultra-low-power retention | Select when 5V bias is required and BYPASS functionality is unnecessary |
| TPS60403DBVR | 3.3V output; 550 kHz switching; 60 mA max output; integrated soft-start; no PGOOD or BYPASS pin | Optimized for cost-sensitive consumer electronics; lacks status signaling and true bypass capability | Select for simpler, lower-current applications where system-level power sequencing is handled externally |
Compared with MAX680ESA+ and TPS60403DBVR, the MCP1258-E/UN uniquely combines 3.3V regulation, BYPASS mode for sub-µA bias retention, PGOOD monitoring, and 100 mA capability in a single 3×3 mm DFN - making it optimal for battery-critical embedded systems requiring both performance and ultra-low-power state management.
Availability
MCP1258-E/UN is available at Aetrix Electronics and suitable for portable measurement instruments, home automation sensors, PIC® MCU bias supplies, real-time clock backup, and battery-powered industrial controllers requiring stable component supply across extended temperature ranges.
Supply support for MCP1258-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 microcontrollers, analog devices, and connectivity solutions, serving automotive, industrial, consumer, and communications markets since 1989.
The MCP125x family was designed specifically for low-noise, inductorless step-up conversion in space- and battery-constrained portable electronics - emphasizing BYPASS mode, wide input range, and robust protection for unattended operation.
FAQ
What is the primary function of the BYPASS pin on the MCP1258-E/UN?
The BYPASS pin on the MCP1258-E/UN is an active-low control input that, when asserted, connects VIN directly to VOUT via an internal low-impedance path (1.5 Ω typical). This bypasses all internal regulation circuitry-including the charge pump, oscillator, and feedback loop-reducing quiescent current to 0.25 µA while maintaining bias on downstream peripherals. The MCP1258-E/UN remains fully functional in this mode, with PGOOD disabled and all switching activity halted.
Does the MCP1258-E/UN require external inductors?
No, the MCP1258-E/UN does not require external inductors. It uses a switched-capacitor (charge pump) architecture with two external 1 µF ceramic flying capacitors (C1 and C2) and input/output bypass capacitors. This eliminates magnetic components, reduces EMI, and enables ultra-compact layouts-making the MCP1258-E/UN ideal for space-constrained portable designs where inductor size and noise are prohibitive.
What is the purpose of the PGOOD pin on the MCP1258-E/UN?
The PGOOD pin on the MCP1258-E/UN is an open-drain output that signals when the 3.3V output is within regulation. It remains high-impedance when VOUT is ≥93% of nominal (3.07V); it pulls low if VOUT drops below that threshold, with 3% hysteresis for noise immunity. PGOOD is disabled during SHDN or BYPASS activation. This pin enables system-level power sequencing, reset generation, or fault logging-critical for reliable startup and brown-out handling in the MCP1258-E/UN application.
How does the MCP1258-E/UN handle thermal overload conditions?
The MCP1258-E/UN incorporates thermal shutdown with automatic recovery: if junction temperature exceeds 160°C, the device disables all internal circuitry until the die cools by 15°C (hysteresis), then resumes normal operation. This protects against sustained overloads or inadequate PCB heat sinking without requiring external thermal management. During thermal cycling, the MCP1258-E/UN may pulse on/off-indicating persistent thermal stress that must be addressed in layout or loading.
What are the recommended external capacitors for the MCP1258-E/UN?
The MCP1258-E/UN requires four external ceramic capacitors: two 1 µF flying capacitors (C1, C2) connected across C1+/C1− and C2+/C2−; one ≥10 µF input capacitor (CIN) from VIN to GND; and one ≥10 µF output capacitor (COUT) from VOUT to GND. Low-ESR (≤0.1 Ω) X5R/X7R ceramics are specified for optimal ripple suppression and efficiency. Using smaller COUT values increases ripple but improves startup time; reducing C1/C2 below 1 µF limits maximum output current.
MCP1258-E/UN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
MCP1258-E/UN FAQ
1.How can I place an order for MCP1258-E/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1258-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 MCP1258-E/UN reliable?
The price and inventory of MCP1258-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 MCP1258-E/UN is usually 5 days.
3.What payment methods are accepted for MCP1258-E/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1258-E/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1258-E/UN?
MCP1258-E/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1258-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 MCP1258-E/UN?
For technical support, including MCP1258-E/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1258-E/UN requirements.
6.How does Aetrix verify that MCP1258-E/UN is sourced from the original manufacturer or authorized distributors?
All MCP1258-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 MCP1258-E/UN meets industry standards.
7.What is the process for return or replacement of MCP1258-E/UN?
All MCP1258-E/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP1258-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 MCP1258-E/UN part is unused and in its original packaging.
Return procedure for MCP1258-E/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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