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Microchip Technology MCP1259-E/UN
- Part No.:
- MCP1259-E/UN
- Manufacturer:
- Microchip Technology
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP1259-E/UN.pdf
- Description:
- IC REG CHARGE PUMP 3.3V 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:290
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Product details
Overview
MCP1259-E/UN from Microchip Technology is a 10-pin DFN inductorless charge-pump DC/DC converter generating a regulated 3.3V output from 1.8V–3.6V input, delivering up to 100 mA with ±3.0% output accuracy, 20 mVPP ripple at full load, and integrated BYPASS mode for direct VIN-to-VOUT connection. It serves as a low-noise bias supply for PIC® MCUs and real-time clocks in coin-cell-powered home automation devices.
For engineers reviewing the MCP1259-E/UN datasheet, MCP1259-E/UN pinout, MCP1259-E/UN application, or MCP1259-E/UN equivalent, key selection criteria include its active-low BYPASS input, LBO open-drain low-battery indicator, thermal shutdown at 160°C, 650 kHz fixed-frequency operation, and compatibility with ceramic flying capacitors (1 µF) and output capacitors (10 µF).
Technical Context
The MCP1259-E/UN implements an autonomous switched-capacitor architecture that dynamically selects between 1.5× and 2× boost modes based on input voltage and load to maximize efficiency-reaching 76.4% at 2.0V/10mA and 65.0% at 2.4V/100mA. Its internal 650 kHz oscillator enables compact filtering while avoiding sensitive IF bands.
Unlike SLEEP-mode variants (MCP1256/7), the MCP1259-E/UN uses BYPASS mode to connect VIN directly to VOUT with only 1.5 Ω typical impedance, reducing quiescent current to 0.25 µA (typical) during inactive periods. Its LBO pin asserts low when VIN drops below 1.95 V (with 240 mV hysteresis), providing system-level battery monitoring without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.0% - ensures stable MCU core/bias rail across battery discharge profile. |
| Input Voltage Range | 1.8 V to 3.6 V - supports 2-cell alkaline/NiMH or single Li-MnO₂ coin cells. |
| Max Output Current | 100 mA at VIN ≥ 2.2 V - sufficient for biasing multiple low-power peripherals simultaneously. |
| Switching Frequency | 650 kHz (fixed) - enables use of small ceramic capacitors and avoids RF interference in ISM bands. |
| BYPASS Impedance | 1.5 Ω (typical) - minimizes voltage drop and power loss when bypassing regulation. |
| LBO Threshold | 1.95 V falling threshold with 240 mV hysteresis - prevents chatter during battery voltage sag. |
| Thermal Shutdown | 160°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Shutdown Current | 0.25 µA (typical) - extends shelf life and standby time in always-on sensor nodes. |
Pinout & Package
Package: 10-lead 3 mm × 3 mm DFN (exposed pad), rated for -40°C to +125°C junction temperature, with θJA = 57°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LBO) | Open-drain low-battery indicator | Asserts logic low when VIN < 1.95 V; requires external pull-up to VOUT for clean logic interface. |
| 2 (BYPASS) | Active-low BYPASS mode enable | Pulls VOUT to VIN with 1.5 Ω impedance when driven low; disables all internal circuitry except pass path. |
| 3 (C2−) | Flying capacitor negative terminal | Connects to 1 µF ceramic capacitor (C2); forms half of charge-transfer network with C2+. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to 1 µF ceramic capacitor (C1); works with C1− to shuttle charge during pump cycles. |
| 5 (VOUT) | Regulated 3.3 V output | Delivers up to 100 mA; requires ≥10 µF ceramic bypass to GND for <20 mVPP ripple at full load. |
| 6 (C2+) | Flying capacitor positive terminal | Completes second flying cap path; paired with C2− to store and transfer energy in 1.5×/2× modes. |
| 7 (VIN) | Main power input | Accepts 1.8–3.6 V; requires ≥1 µF ceramic decoupling close to pin to suppress high-frequency transients. |
| 8 (C1−) | Flying capacitor negative terminal | Completes first flying cap path; must be placed adjacent to C1+ with minimal trace inductance. |
| 9 (GND) | Power and signal reference | Common return for all capacitors and load; must connect to exposed DFN pad for thermal and EMI performance. |
| 10 (SHDN) | Active-low shutdown control | Drives device into 0.25 µA sleep state; compatible with 1.8 V logic; high-impedance when not asserted. |
Key Features
| Feature | Design Value |
|---|---|
| BYPASS Mode | Direct VIN-to-VOUT connection with 1.5 Ω impedance enables zero-regulation-loss bias for RTCs or memory retention during deep sleep. |
| Low-Battery Detection | Integrated LBO comparator with 1.95 V threshold and 240 mV hysteresis eliminates need for external voltage monitor ICs. |
| Inductorless Architecture | Uses only four 0402/0603 ceramic capacitors - reduces BOM count, PCB area, and EMI vs. inductive switchers. |
| Thermal & Short-Circuit Protection | Foldback current limiting caps short-circuit current at 150 mA (typical); thermal shutdown at 160°C prevents damage under sustained overload. |
| Soft-Start Circuitry | 175 µs typical VOUT rise time from shutdown/BYPASS ensures controlled power-up without inrush-induced brownouts. |
| Wide Temperature Range | Fully specified from -40°C to +125°C - suitable for automotive cabin modules and industrial sensors without derating. |
Applications
| PIC® MCU Bias Supply | Real-Time Clock (RTC) Backup |
|---|---|
Use Scenario: Powering Microchip PIC® microcontrollers from a single CR2032 coin cell in portable medical monitors. IC Role / Device Role / Timing Role: Provides regulated 3.3 V bias rail with ±3.0% accuracy and <20 mVPP ripple to ensure reliable flash programming and analog peripheral operation. Use Value: Enables >5-year battery life via 0.25 µA shutdown current and BYPASS mode during MCU sleep cycles. | Use Scenario: Maintaining timekeeping in smart thermostats during main power failure using a backup coin cell. IC Role / Device Role / Timing Role: Delivers unregulated VIN-to-VOUT pass-through in BYPASS mode while asserting LBO to warn host MCU of impending battery depletion. Use Value: Eliminates need for separate LDO + supervisor IC, reducing footprint by 30% and component cost by $0.18/unit. |
| Home Automation Sensor Node | Portable Measurement Instrument |
Use Scenario: Powering Zigbee wireless transceivers and environmental sensors in battery-operated wall switches. IC Role / Device Role / Timing Role: Supplies 3.3 V to RF IC and ADC while switching between regulated mode (active transmit) and BYPASS mode (idle listening). Use Value: Achieves 20% longer operational duty cycle vs. fixed-output LDO due to adaptive 1.5×/2× charge-pump efficiency optimization. | Use Scenario: Biasing precision op-amps and SAR ADCs in handheld multimeters powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Generates stable 3.3 V reference rail across 3.2 V (fresh) to 1.8 V (depleted) input range with <5 mVPP ripple at light loads. Use Value: Maintains 16-bit measurement accuracy over full battery life without recalibration, thanks to ±3.0% output tolerance and thermal stability. |
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 |
|---|---|---|---|
| MCP1258-E/MS | Same BYPASS functionality and LBO threshold, but in MSOP-10 package (θJA = 200°C/W vs. 57°C/W for DFN). | Preferred where hand-soldering or thermal relief is prioritized over space-constrained layouts. | Select MCP1258-E/MS if board assembly uses reflow-only processes and thermal performance is secondary to ease of prototyping. |
| TPS60403DBVR | 3.3 V fixed output, 60 mA max, no LBO or BYPASS; uses different flying cap topology (single-cap 2× only) and higher 1.2 MHz frequency. | Suitable for simpler, lower-current applications where battery monitoring and ultra-low-quiescent bypass are not required. | Choose TPS60403DBVR only when output current ≤60 mA and system lacks firmware support for LBO-driven battery management. |
Compared with MCP1258-E/MS, the MCP1259-E/UN offers superior thermal performance in space-constrained designs; compared with TPS60403DBVR, it delivers higher output current, integrated battery monitoring, and true BYPASS functionality-making it the optimal choice for coin-cell-powered systems requiring both runtime extension and health awareness.
Availability
MCP1259-E/UN is available at Aetrix Electronics and suitable for home automation sensor nodes, portable measurement instruments, PIC® MCU bias supplies, and real-time clock backup circuits requiring stable component supply across extended product lifecycles.
Supply support for MCP1259-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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets since 1989.
The MCP125x family was designed specifically for ultra-low-power, inductorless DC/DC conversion in battery-powered embedded systems-emphasizing minimal external components, robust protection, and intelligent power-state management.
FAQ
What is the primary function of the MCP1259-E/UN in a battery-powered system?
The MCP1259-E/UN functions as a regulated 3.3 V charge-pump DC/DC converter that boosts input voltages from 1.8 V to 3.6 V-enabling operation from single coin cells or dual alkaline batteries. Its BYPASS mode connects VIN directly to VOUT with 1.5 Ω impedance, and its LBO pin provides low-battery detection at 1.95 V, making the MCP1259-E/UN ideal for extending runtime and enabling intelligent power management in portable electronics.
How does the BYPASS mode of the MCP1259-E/UN differ from standard shutdown?
In BYPASS mode, the MCP1259-E/UN disables all internal regulation circuitry-including the oscillator, charge pump, and feedback loop-but maintains a low-impedance path (1.5 Ω typical) between VIN and VOUT. This allows external peripherals like RTCs or SRAM to remain powered with near-zero quiescent current (0.25 µA typical), unlike standard shutdown which disconnects the output entirely. The MCP1259-E/UN thus preserves system state without consuming battery energy.
What external components are required for basic operation of the MCP1259-E/UN?
The MCP1259-E/UN requires four ceramic capacitors: two 1 µF flying capacitors (C1, C2) connected across pins C1+/C1− and C2+/C2−, one 10 µF input capacitor (CIN) on VIN, and one 10 µF output capacitor (COUT) on VOUT. No inductors or diodes are needed. A 10 kΩ–1 MΩ pull-up resistor on LBO is recommended for clean logic interfacing, and the exposed DFN pad must be soldered to GND for thermal and electrical integrity.
Can the MCP1259-E/UN replace an LDO in a 3.3 V bias application?
Yes-the MCP1259-E/UN can replace an LDO when the input voltage falls below 3.3 V (e.g., 2.4 V from a depleted battery), as it actively boosts VIN to regulated 3.3 V. Unlike an LDO, which drops out when VIN < VOUT + dropout voltage, the MCP1259-E/UN maintains regulation down to 1.8 V input. However, it introduces switching noise (650 kHz), so sensitive analog sections may require additional LC filtering not needed with an LDO.
What is the significance of the LBO pin behavior during BYPASS mode activation?
When BYPASS mode is activated on the MCP1259-E/UN, the LBO pin goes into high-impedance state and ceases to assert low-even if VIN drops below 1.95 V-because all internal comparators and monitoring circuitry are disabled. This behavior is intentional: LBO is only active during regulated operation. To maintain battery monitoring during BYPASS, the host system must either sample LBO before entering BYPASS or use a separate fuel-gauge IC, as the MCP1259-E/UN does not provide concurrent LBO assertion and BYPASS conduction.
MCP1259-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
MCP1259-E/UN FAQ
1.How can I place an order for MCP1259-E/UN through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1259-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 MCP1259-E/UN reliable?
The price and inventory of MCP1259-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 MCP1259-E/UN is usually 5 days.
3.What payment methods are accepted for MCP1259-E/UN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1259-E/UN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1259-E/UN?
MCP1259-E/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1259-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 MCP1259-E/UN?
For technical support, including MCP1259-E/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1259-E/UN requirements.
6.How does Aetrix verify that MCP1259-E/UN is sourced from the original manufacturer or authorized distributors?
All MCP1259-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 MCP1259-E/UN meets industry standards.
7.What is the process for return or replacement of MCP1259-E/UN?
All MCP1259-E/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP1259-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 MCP1259-E/UN part is unused and in its original packaging.
Return procedure for MCP1259-E/UN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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