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Microchip Technology MCP1259T-E/UN
- Part No.:
- MCP1259T-E/UN
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1259T-E/UN.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1259T-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. It provides up to 100 mA output current, ±3.0% output voltage accuracy, 20 mVPP ripple at 100 mA, and features BYPASS mode for near-zero quiescent current operation. It is designed for battery-powered microcontroller biasing in portable measurement instruments.
For engineers reviewing the MCP1259T-E/UN datasheet, MCP1259T-E/UN pinout, MCP1259T-E/UN application, or MCP1259T-E/UN equivalent, key selection criteria include its active-low BYPASS input, LBO low-battery indication, 650 kHz fixed switching frequency, thermal shutdown at 160°C, and compatibility with ceramic flying capacitors (1 µF) and output capacitors (10 µF).
Technical Context
The MCP1259T-E/UN implements an autonomous switched-capacitor architecture that dynamically selects between 1.5x and 2x boost modes based on input voltage and load to maximize efficiency. Its regulation loop uses a feedback amplifier with bandgap reference and hysteresis-based control, enabling stable 3.3V output across the full -40°C to +125°C junction temperature range.
It integrates dedicated circuitry for BYPASS mode-direct VIN-to-VOUT connection with <1.5 Ω impedance-and open-drain LBO with 1.95 V threshold and 240 mV hysteresis. Shutdown current is 0.25 µA (typ), and wake-up time from BYPASS is 150 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V - delivers stable bias for 3.3V logic and PIC® MCUs without external feedback components. |
| Input Voltage Range | 1.8 V to 3.6 V - supports 2-cell alkaline/NiMH batteries and single Li-MnO₂ coin cells. |
| Max Output Current | 100 mA at VIN ≥ 2.2 V - sufficient for powering core logic and peripherals in portable instrumentation. |
| Output Ripple | 20 mVPP at 100 mA - meets low-noise requirements for analog-sensing front-ends when paired with 10 µF COUT. |
| Switching Frequency | 650 kHz - enables compact filtering and avoids interference with common IF bands. |
| LBO Threshold | 1.95 V falling threshold - provides early warning of battery depletion before system brownout. |
| BYPASS Impedance | 1.5 Ω typical - ensures minimal voltage drop (<15 mV at 10 mA) when bypassing regulator path. |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
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 (LBO) | Open-drain low-battery indicator output | Asserts logic low when VIN falls below 1.95 V; requires external pull-up to VOUT for digital interface. |
| 2 (BYPASS) | Active-low BYPASS mode enable input | Pulling low connects VIN directly to VOUT, disabling all internal circuitry except pass path. |
| 3 (C2−) | Flying capacitor negative terminal | Connects to 1 µF ceramic capacitor (C2); forms charge-transfer node in 2x mode. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to 1 µF ceramic capacitor (C1); critical for charge pumping efficiency and ripple control. |
| 5 (VOUT) | Regulated 3.3V output | Supplies power to load; must be bypassed with ≥10 µF ceramic capacitor to GND for stability. |
| 6 (C2+) | Flying capacitor positive terminal | Completes C2 flying cap connection; shares topology with C1+ for dual-capacitor charge transfer. |
| 7 (VIN) | Main power supply input | Accepts 1.8–3.6 V; requires ≥1 µF local bypass to minimize input ripple and EMI coupling. |
| 8 (C1−) | Flying capacitor negative terminal | Completes C1 flying cap connection; symmetric layout with C2− reduces parasitic imbalance. |
| 9 (GND) | Power and signal reference ground | Must be connected to low-impedance ground plane; shared return for all capacitors and load. |
| 10 (SHDN) | Active-low shutdown control input | Pulling low disables oscillator, charge pumps, and protection circuits; draws only 0.25 µA (typ). |
Key Features
| Feature | Design Value |
|---|---|
| BYPASS Mode | Direct VIN-to-VOUT conduction with <1.5 Ω impedance, enabling zero-regulator-quiescent-current operation for extended battery life. |
| Low-Battery Detection | Dedicated LBO output with 1.95 V threshold and 240 mV hysteresis - eliminates need for external supervisor IC in battery-critical systems. |
| Inductorless Architecture | Uses only four 1–10 µF ceramic capacitors - reduces BOM cost, board area, and EMI vs. inductive DC/DC solutions. |
| Thermal & Short-Circuit Protection | Auto-recovering shutdown at 160°C and foldback current limiting to 150 mA - ensures robustness in unattended portable deployments. |
| Soft-Start | 175 µs typical VOUT rise time from BYPASS or shutdown - prevents inrush-induced supply droop in multi-rail systems. |
| Wide Temperature Range | Full -40°C to +125°C operation - qualified for industrial and automotive under-hood sensor applications. |
Applications
| Portable Measurement Instruments | PIC® MCU Bias Supply |
|---|---|
Use Scenario: Handheld multimeters and environmental sensors powered by coin-cell or AA batteries requiring stable 3.3V rail over full battery discharge curve. IC Role / Device Role / Timing Role: Primary regulated bias source for ADCs, op-amps, and wireless transceivers; LBO triggers firmware battery-saving routines. Use Value: BYPASS mode extends runtime >3× vs. continuous regulation during idle periods while maintaining MCU wake-up readiness. | Use Scenario: Low-power PIC® microcontrollers in home automation nodes (e.g., smart thermostats, door sensors) operating from 2-cell alkaline batteries. IC Role / Device Role / Timing Role: Dedicated 3.3V supply for MCU core and I/O; SHDN and BYPASS enable synchronized deep-sleep entry/exit. Use Value: 0.25 µA shutdown current and 1.5 Ω BYPASS path minimize total system quiescent draw to sub-µA levels. |
| Home Automation Products | Real-Time Clock (RTC) Backup |
Use Scenario: Battery-backed wireless switches and occupancy sensors where size, cost, and longevity are critical. IC Role / Device Role / Timing Role: Compact, capacitor-only power solution replacing discrete LDO + supervisor combinations. Use Value: Eliminates inductor and reduces component count by 4–6 parts, cutting PCB area by >30% vs. buck/boost alternatives. | Use Scenario: RTC modules requiring uninterrupted bias during main power loss, using same coin cell for both primary and backup functions. IC Role / Device Role / Timing Role: Provides regulated 3.3V to RTC during normal operation; BYPASS maintains unregulated but functional bias when regulation is unnecessary. Use Value: Enables single-cell operation with no voltage sag during RTC keep-alive - avoids premature RTC reset during battery transition. |
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 BYPASS/LBO functionality and 3.3V output, but in 10-pin MSOP package (θJA = 200°C/W vs. 57°C/W for DFN). | Preferred where hand-soldering or legacy footprint compatibility is required; less thermally efficient in high-power-density layouts. | Select MCP1258T-E/MS if MSOP footprint matches existing design or thermal derating is acceptable. |
| TPS60403DBVR | 3.3V fixed-output charge pump (1.5x/2x), but lacks LBO and BYPASS; offers 60 mA max output and 1.8–5.5 V input range. | Suitable for general-purpose 3.3V bias where battery monitoring or ultra-low-quiescent bypass is not needed. | Choose TPS60403DBVR only when LBO/BYPASS are unnecessary and lower output current suffices. |
Compared with MCP1258T-E/MS, the MCP1259T-E/UN offers superior thermal performance in space-constrained designs due to its DFN package, while TPS60403DBVR trades away critical battery-aware features for broader input range and TI ecosystem support.
Availability
MCP1259T-E/UN is available at Aetrix Electronics and suitable for portable measurement instruments, PIC® MCU bias supply, and home automation products requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MCP1259T-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, with global design, manufacturing, and sales operations.
The MCP125x family was designed specifically for ultra-low-power, inductorless step-up conversion in battery-powered portable electronics - prioritizing simplicity, small footprint, and intelligent power-state management (BYPASS/SLEEP/SHDN).
FAQ
What is the function of the BYPASS pin on the MCP1259T-E/UN?
The BYPASS pin on the MCP1259T-E/UN is an active-low input that, when pulled low, connects VIN directly to VOUT via an internal ~1.5 Ω switch. This bypasses the charge pump entirely, eliminating regulator quiescent current while maintaining power to downstream circuitry - ideal for extending battery life during system idle states. The MCP1259T-E/UN remains fully functional upon exit from BYPASS mode.
Does the MCP1259T-E/UN require external feedback resistors to set its output voltage?
No, the MCP1259T-E/UN has a factory-trimmed, fixed 3.3V output and does not require external feedback resistors. Its regulation is achieved internally via a precision bandgap reference and error amplifier. This simplifies design, reduces component count, and ensures ±3.0% output accuracy across temperature and load - a key advantage of the MCP1259T-E/UN over adjustable charge pumps.
How does the LBO (Low-Battery Output) feature work on the MCP1259T-E/UN?
The LBO pin on the MCP1259T-E/UN is an open-drain output that asserts logic low when VIN drops below 1.95 V (typical), with 240 mV hysteresis to prevent chatter near the threshold. It remains high-impedance during SHDN or BYPASS. A pull-up resistor to VOUT converts it to a clean logic signal for firmware battery monitoring - a built-in capability that eliminates the need for external voltage supervisors in the MCP1259T-E/UN design.
What is the maximum output current capability of the MCP1259T-E/UN, and under what conditions?
The MCP1259T-E/UN delivers up to 100 mA output current when VIN is ≥2.2 V, as specified in the DS21989B datasheet. At lower input voltages (1.8–2.0 V), max output current drops to 30 mA; at 2.0–2.2 V, it is 70 mA. These limits reflect charge pump physics and internal switch sizing - exceeding them risks output voltage droop or thermal shutdown. The MCP1259T-E/UN maintains regulation within ±3.0% across this full range.
Can the MCP1259T-E/UN operate from a single lithium coin cell, and what is the minimum input voltage?
Yes, the MCP1259T-E/UN is explicitly designed to operate from a single primary lithium MnO₂ coin cell (e.g., CR2032), which typically ranges from 3.0 V down to 2.0 V. Its 1.8 V minimum input rating allows reliable startup even as the cell discharges near end-of-life. The LBO output further enhances usability by signaling when VIN approaches 1.95 V - ensuring the MCP1259T-E/UN supports full usable battery capacity without unexpected brownouts.
MCP1259T-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
MCP1259T-E/UN FAQ
1.How can I place an order for MCP1259T-E/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1259T-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 MCP1259T-E/UN reliable?
The price and inventory of MCP1259T-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 MCP1259T-E/UN is usually 5 days.
3.What payment methods are accepted for MCP1259T-E/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1259T-E/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1259T-E/UN?
MCP1259T-E/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1259T-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 MCP1259T-E/UN?
For technical support, including MCP1259T-E/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1259T-E/UN requirements.
6.How does Aetrix verify that MCP1259T-E/UN is sourced from the original manufacturer or authorized distributors?
All MCP1259T-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 MCP1259T-E/UN meets industry standards.
7.What is the process for return or replacement of MCP1259T-E/UN?
All MCP1259T-E/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP1259T-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 MCP1259T-E/UN part is unused and in its original packaging.
Return procedure for MCP1259T-E/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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