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Microchip Technology MCP1259T-E/MF
- Part No.:
- MCP1259T-E/MF
- Manufacturer:
- Microchip Technology
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MCP1259T-E/MF.pdf
- Description:
- IC REG CHG PUMP 3.3V 100MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
MCP1259T-E/MF from Microchip Technology is a 10-pin DFN-packaged, inductorless charge-pump DC/DC converter delivering a regulated 3.3V output from 1.8V–3.6V input, supporting up to 100 mA load current with ±3.0% output accuracy, 20 mVPP ripple at full load, and integrated BYPASS mode for ultra-low-power biasing of real-time clocks and microcontrollers.
For engineers reviewing the MCP1259T-E/MF datasheet, MCP1259T-E/MF pinout, MCP1259T-E/MF application, or MCP1259T-E/MF equivalent, this page provides verified functional specifications, validated pin roles, confirmed BYPASS-mode behavior, thermal shutdown thresholds, and direct alternative options for battery-powered portable instrumentation and low-voltage MCU biasing.
Technical Context
The MCP1259T-E/MF implements an autonomous 1.5x/2x switched-capacitor topology with internal 650 kHz oscillator, using four external ceramic capacitors (CIN, COUT, C1, C2) to achieve regulation without inductors. Its BYPASS mode directly connects VIN to VOUT with 1.5 Ω typical impedance, disabling all internal circuitry except the pass path.
It features open-drain LBO output asserting low at 1.95 V VIN (with 240 mV hysteresis), active-low BYPASS control compatible with 1.8V logic, and thermal shutdown at 160°C with 15°C hysteresis - all fully characterized from –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.0% - ensures stable bias for 3.3V logic and analog peripherals without external feedback. |
| Input Voltage Range | 1.8 V to 3.6 V - supports single Li-MnO₂ coin cells and dual alkaline/NiMH batteries without under-voltage lockout. |
| Max Output Current | 100 mA at VIN ≥ 2.2 V - sufficient for biasing PIC® MCUs, RTCs, and low-power sensors in portable systems. |
| Output Ripple | 20 mVPP at 100 mA load - meets noise-sensitive analog supply requirements with standard 10 µF COUT. |
| Switching Frequency | 650 kHz fixed - avoids IF bands and enables compact filtering with small ceramic capacitors only. |
| BYPASS Impedance | 1.5 Ω typical - minimizes voltage drop during direct VIN-to-VOUT conduction, preserving system runtime. |
| LBO Threshold | 1.95 V falling threshold with 240 mV hysteresis - provides reliable early-warning low-battery detection for host firmware. |
| Shutdown Current | 0.25 µA typical - extends shelf life and standby time in always-on battery applications. |
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 | Asserts logic low when VIN falls below 1.95 V; requires external pull-up to VOUT for digital interface. |
| 2 (BYPASS) | Active-low BYPASS enable input | Drives internal pass switch; logic low connects VIN directly to VOUT with 1.5 Ω impedance. |
| 3 (C2–) | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic flying capacitor C2; critical for charge transfer integrity. |
| 4 (C1+) | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic flying capacitor C1; forms charge pump stage 1. |
| 5 (VOUT) | Regulated 3.3 V output | Delivers up to 100 mA; bypass to GND with ≥2.2 µF ceramic capacitor for ripple suppression. |
| 6 (C2+) | Flying capacitor positive terminal | Connects to positive side of 1 µF ceramic flying capacitor C2; forms charge pump stage 2. |
| 7 (VIN) | Main power input | Accepts 1.8–3.6 V; bypass to GND with ≥1 µF ceramic capacitor to stabilize input impedance. |
| 8 (C1–) | Flying capacitor negative terminal | Connects to negative side of 1 µF ceramic flying capacitor C1; completes flying cap network. |
| 9 (GND) | Power and signal reference | Must be low-inductance connection to PCB ground plane; ties all internal circuit references. |
| 10 (SHDN) | Active-low shutdown control | Logic low disables oscillator, switches, and regulators; quiescent current drops to 0.25 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless charge-pump architecture | Eliminates EMI-prone magnetics and reduces BOM count to four ceramic capacitors only. |
| Auto-switching 1.5x/2x boost modes | Optimizes efficiency across input range: >76% at VIN = 2.4 V, IOUT = 100 mA. |
| Integrated BYPASS mode | Reduces effective supply current to near-zero while maintaining unregulated bias for RTCs and memory retention. |
| Low-battery detection (LBO) | Provides system-level battery health monitoring without external comparators or resistive dividers. |
| Thermal and short-circuit protection | Shuts down at 160°C (15°C hysteresis) and limits short-circuit current to 150 mA, enabling robust field operation. |
| Soft-start and foldback current limiting | Controls inrush during startup and prevents damage during output overload or capacitor faults. |
Applications
| Portable Measurement Instruments | Home Automation Sensors |
|---|---|
Use Scenario: Handheld multimeters and environmental data loggers powered by coin-cell or AA batteries requiring stable 3.3V rail for ADCs and wireless transceivers. IC Role / Device Role / Timing Role: Regulated 3.3V bias generator with BYPASS mode enabling zero-current sleep between measurements. Use Value: Extends battery life beyond 5 years in intermittent-read applications by eliminating quiescent draw during idle periods. | Use Scenario: Battery-operated door/window sensors and occupancy detectors in smart-home hubs with strict size and power constraints. IC Role / Device Role / Timing Role: Primary voltage translator from 2×AA (2.4–3.2 V) to 3.3V MCU and RF IC supply, with LBO signaling end-of-life to cloud gateway. Use Value: Enables predictive battery replacement alerts and eliminates false-trigger events caused by brown-out conditions. |
| PIC® MCU Bias Supply | Real-Time Clock (RTC) Backup |
Use Scenario: Embedded control units using PIC16/PIC18 MCUs where main supply may dip below 3.0V during motor startup or radio transmission. IC Role / Device Role / Timing Role: Dedicated 3.3V regulator ensuring consistent core voltage and peripheral timing margins independent of main rail fluctuations. Use Value: Prevents MCU reset or flash corruption during transient load events by maintaining regulated VDD within ±3% tolerance. | Use Scenario: Industrial timers and energy meters needing continuous RTC operation during main power loss or deep-sleep cycles. IC Role / Device Role / Timing Role: BYPASS-enabled bias path delivering unregulated VIN directly to RTC VBAT pin while disabling all internal circuitry. Use Value: Reduces RTC backup current to <100 nA (excluding RTC's own draw), maximizing coin-cell service life beyond 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 |
|---|---|---|---|
| MCP1258T-E/MF | Same package and pinout; includes PGOOD instead of LBO; no low-battery indication. | Suitable where power-good status is required for system sequencing rather than battery monitoring. | Select when host firmware needs regulated output validation instead of input voltage warning. |
| TPS60403DBVR | 3.3V fixed-output, 60 mA max, 1.8–5.5V input, 1.2 MHz switching; no LBO/BYPASS; SOT-23-6 package. | Lacks integrated battery monitoring and bypass functionality; requires external components for similar feature set. | Choose only if board space allows SOT-23 footprint and system already implements discrete LBO logic. |
Compared with MCP1258T-E/MF, MCP1259T-E/MF trades PGOOD for LBO to support battery-aware firmware; compared with TPS60403DBVR, it offers higher output current, integrated diagnostics, and BYPASS mode - making it superior for long-life, feature-rich portable designs.
Availability
MCP1259T-E/MF is available at Aetrix Electronics and suitable for portable measurement instruments, home automation sensors, PIC® MCU bias supplies, real-time clock backup, and low-power wireless sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MCP1259T-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability semiconductor products.
The MCP1259T-E/MF belongs to Microchip's MCP125x family of inductorless charge-pump regulators, designed specifically for ultra-low-power, space-constrained battery applications where EMI, component count, and runtime are critical design parameters.
FAQ
What is the primary function of the MCP1259T-E/MF?
The MCP1259T-E/MF is a fixed 3.3V inductorless charge-pump DC/DC converter that boosts 1.8V–3.6V input to a regulated output, featuring integrated BYPASS mode for direct VIN-to-VOUT conduction and LBO for low-battery detection. It delivers up to 100 mA with ±3.0% accuracy and is optimized for battery-powered portable systems.
How does BYPASS mode operate in the MCP1259T-E/MF?
In BYPASS mode, asserted by pulling the BYPASS pin low, the MCP1259T-E/MF internally connects VIN directly to VOUT via a 1.5 Ω pass path while disabling the oscillator, charge pumps, and regulation circuitry. This reduces supply current to near-zero while maintaining bias for RTCs or memory - a key runtime-extending feature unique to the MCP1259T-E/MF.
What is the LBO output behavior on the MCP1259T-E/MF?
The LBO pin on the MCP1259T-E/MF is an open-drain output that asserts low when VIN falls below 1.95 V (typical), with 240 mV hysteresis to prevent chatter. It remains high-impedance during SHDN or BYPASS activation. A pull-up resistor to VOUT is required to generate a logic-high signal when battery voltage is healthy.
Can the MCP1259T-E/MF replace the MCP1258T-E/MF in an existing design?
No - the MCP1259T-E/MF and MCP1258T-E/MF are not pin-compatible replacements. While both share the same package and BYPASS/SLEEP pin positions, MCP1259T-E/MF uses Pin 1 for LBO whereas MCP1258T-E/MF uses Pin 1 for PGOOD. Swapping them requires PCB layout revision and firmware adaptation for the different status signal.
What external components are mandatory for stable operation of the MCP1259T-E/MF?
The MCP1259T-E/MF requires four external ceramic capacitors: 10 µF input (CIN), 10 µF output (COUT), and two 1 µF flying capacitors (C1, C2). All must be low-ESR X5R/X7R types. No inductors, diodes, or resistors are needed - the device operates with only these four passive components for full functionality including BYPASS and LBO.
MCP1259T-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)
MCP1259T-E/MF FAQ
1.How can I place an order for MCP1259T-E/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1259T-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 MCP1259T-E/MF reliable?
The price and inventory of MCP1259T-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 MCP1259T-E/MF is usually 5 days.
3.What payment methods are accepted for MCP1259T-E/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1259T-E/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1259T-E/MF?
MCP1259T-E/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1259T-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 MCP1259T-E/MF?
For technical support, including MCP1259T-E/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1259T-E/MF requirements.
6.How does Aetrix verify that MCP1259T-E/MF is sourced from the original manufacturer or authorized distributors?
All MCP1259T-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 MCP1259T-E/MF meets industry standards.
7.What is the process for return or replacement of MCP1259T-E/MF?
All MCP1259T-E/MF units undergo pre-shipment inspection (PSI). If there is an issue with MCP1259T-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 MCP1259T-E/MF part is unused and in its original packaging.
Return procedure for MCP1259T-E/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1259T-E/MF Tags
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