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Analog Devices Inc. LTC4041IUFD#PBF
- Part No.:
- LTC4041IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC4041IUFD#PBF.pdf
- Description:
- IC BATT PWR MGMT MULTI 1C 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC4041IUFD#PBF from Analog Devices is a 2.5A supercapacitor backup power manager IC for 2.9V–5.5V supply rails, integrating a synchronous step-down charger and reverse-operating step-up backup regulator. It supports single or dual-series supercapacitors, features internal balancing, programmable charge voltage/current, and automatic seamless switchover during input power loss-used in industrial UPS, power meters, and SSD backup supplies.
For engineers reviewing the LTC4041IUFD#PBF datasheet, LTC4041IUFD#PBF pinout, LTC4041IUFD#PBF application, or LTC4041IUFD#PBF equivalent, key selection criteria include its 2.5A bidirectional regulation capability, 24-pin 4mm × 5mm QFN package with exposed thermal pad, input current limiting via IMON, programmable PFI threshold, and integrated supercapacitor voltage balancing without external resistors.
Technical Context
The LTC4041IUFD#PBF implements a dual-mode synchronous buck-boost architecture: in normal mode, its 2.25MHz step-down converter charges supercapacitors up to 2.5A; in backup mode, the same power stage reverses to operate as a 1.125MHz step-up regulator delivering up to 2.5A from the supercapacitor to VSYS. It uses internal current-sense amplification (AV = 32) on the CLN–VIN node and a 0.8V servo reference at CAPFB/BSTFB for precise voltage regulation.
Its auxiliary circuitry includes a dedicated 0.74V SYSGD comparator with RSTFB input, a 1.19V PFI comparator driving open-drain PFO, and a 2.7V/–20mV supercapacitor fault monitor on CAPFLT. The balancer maintains equal voltage across two-series supercapacitors by sourcing/sinking ±50mA at VBAL, with top/bottom overvoltage protection set at 2.8V and undervoltage at –20mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - supports direct connection to common system rails including 3.3V and 5V supplies without level shifting. |
| Charge Current | Up to 2.5A - programmable via PROG pin resistor; enables rapid charging of 10F+ supercapacitors in under 10 seconds. |
| Backup Output Current | 2.5A continuous - delivers stable system power during input failure using supercapacitor energy, with 88% max duty cycle. |
| Switching Frequencies | Buck: 2.25MHz / Boost: 1.125MHz - high-frequency operation allows compact 2.2µH inductors and low-profile ceramic output capacitors. |
| Supercapacitor Balancing | Internal ±50mA source/sink - eliminates need for external balancing resistors and ensures safe voltage sharing across two-series supercapacitors. |
| Package | 24-lead 4mm × 5mm × 0.75mm QFN with exposed GND pad - thermally enhanced for >1A continuous dissipation in industrial ambient conditions. |
| OVP Protection | 6.4V threshold (typical) - safeguards against transient overvoltage up to 60V via optional external FET and OVSNS sense network. |
Pinout & Package
Package: 24-lead plastic QFN (4mm × 5mm × 0.75mm), exposed thermal pad (Pin 25) required to be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSYS (Pins 1, 24) | System output rail | Primary power delivery node - supplies load during normal operation and receives charge current from buck stage; requires ≥100µF low-ESR ceramic bypass. |
| SCAP (Pin 23) | Supercapacitor connection | Interface to single supercapacitor or top of two-series stack; serves as both buck output and boost input node. |
| SW (Pins 21, 22) | Power switch node | Common switching node for buck inductor and boost inductor - connects to 2.2µH inductor between SCAP and SW. |
| PROG (Pin 2) | Charge current programming | Sets full-scale charge current via resistor to GND; internal 2500× current ratio enables accurate 1A–2.5A programming with standard 1% resistors. |
| IMON (Pin 3) | Input current monitoring | Amplifies (×32) VIN–CLN differential voltage - used to dynamically reduce charge current when system load exceeds input current limit set by RS. |
| PFI (Pin 19) | Power-fail detection input | High-impedance comparator input with 1.19V falling threshold - triggers backup mode and disables charger when input drops below programmed level. |
| CAPFB (Pin 12) | Supercapacitor voltage feedback | Servo point for supercapacitor regulation - external divider sets final VSCAP; internal 0.8V reference enables precise CV termination at 97.5% recharge threshold. |
| BAL (Pin 9) | Stack balance reference | Drives midpoint of two-series supercapacitors to 50% of total VSCAP - enables passive balancing without external components. |
| IGATE (Pin 15) | External FET gate driver | Charge-pump boosted output - drives gate of mandatory input disconnect FET (MN2) and optional OVP FET (MN1) for isolation during backup. |
| GND (Pin 25) | Thermal & electrical ground | Exposed pad - must be soldered to solid PCB ground plane to maintain θJA = 43°C/W and ensure safe 125°C junction operation. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless backup switchover | Automatic transition from buck charging to boost backup within microseconds upon PFI threshold breach - no system reset or brownout. |
| Programmable input current limit | Adjustable via RS sense resistor (25mV threshold) - prioritizes system load over supercapacitor charging to prevent input supply overload. |
| Integrated supercapacitor balancer | ±50mA active balancing with 2.8V overvoltage and –20mV undervoltage thresholds - eliminates external resistors and prevents cell imbalance failure. |
| Input disconnect switch control | Dedicated IGATE driver with charge pump - isolates VSYS from VIN during backup mode using external NMOS, ensuring zero backfeed. |
| Configurable power-fail response | PFI comparator with 40mV hysteresis and programmable threshold - enables precise ride-through timing for "dying gasp" applications in smart meters and servers. |
Applications
| Industrial Power Meters | Server & SSD Backup |
|---|---|
Use Scenario: Maintains real-time clock, metering data, and communication during AC mains interruption in smart electricity meters. IC Role / Device Role / Timing Role: Backup power manager - provides regulated 3.3V/5V output from supercapacitor during grid outage, enabling secure data retention and last-gasp reporting. Use Value: Delivers 3.3W (3.3V @ 1A) for ≥3.8 seconds using a single 10F supercapacitor - meets IEC 62053-21 tamper-proof data retention requirements. | Use Scenario: Preserves DRAM cache and NAND write buffers during unexpected server power loss or SSD controller reset. IC Role / Device Role / Timing Role: High-current ride-through supply - sustains 5V system rail at 2.5A for critical firmware save operations before shutdown. Use Value: 2.5A continuous boost output enables <10ms data flush for enterprise SSDs - avoids data corruption during sudden power failure. |
| Industrial Alarms & PLCs | High-Reliability UPS Modules |
Use Scenario: Powers emergency alarm logic and sensor interface during battery-switchover delay or primary supply sag in factory automation systems. IC Role / Device Role / Timing Role: Dying-gasp supply manager - monitors VSYS with SYSGD comparator and initiates backup before brownout resets microcontroller. Use Value: Programmable RSTFB threshold (0.74V) and 100µs comparator delay enable precise 5V system supervision - prevents false triggers during line transients. | Use Scenario: Serves as core backup engine in compact 3V–5V UPS modules for edge computing gateways and telecom infrastructure. IC Role / Device Role / Timing Role: Dual-path power manager - combines buck charging efficiency (>90% at 2A) with boost conversion stability (±1% VSYS regulation). Use Value: Internal 2.25MHz/1.125MHz switching enables <1cm² solution size - reduces BOM count vs discrete buck+boost implementations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supercapacitor backup management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX32664GTG+ | Lower 1.5A max backup current; integrates ARM Cortex-M0+ MCU and fuel gauge; no internal balancer; requires external balancing resistors for dual-cell stacks. | Targeted at battery-backed IoT sensors with embedded firmware - not optimized for high-current, capacitor-only backup systems. | Select MAX32664GTG+ only if firmware-controlled state management and battery telemetry are required alongside backup power. |
| BQ33100RHF | 1.2A max backup current; supports Li-ion and supercapacitor chemistries; includes coulomb counting and health monitoring; no integrated OVP circuit. | Designed for hybrid energy storage systems with battery + capacitor - lacks dedicated high-current boost path for pure supercapacitor UPS use cases. | Choose BQ33100RHF when long-term energy accounting and multi-chemistry flexibility outweigh peak current and OVP requirements. |
Compared with MAX32664GTG+ and BQ33100RHF, the LTC4041IUFD#PBF delivers 2.5A continuous backup current, integrated supercapacitor balancing, and optional 60V OVP - making it uniquely suited for high-reliability, high-power industrial ride-through where simplicity, speed, and robustness are critical.
Availability
LTC4041IUFD#PBF is available at Aetrix Electronics and suitable for industrial power meters, server SSD backup systems, and high-reliability UPS modules requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-lifecycle availability.
Supply support for LTC4041IUFD#PBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4041IUFD#PBF belongs to ADI's Power Management portfolio, specifically designed for high-efficiency, high-reliability backup power solutions in mission-critical industrial and computing applications where seamless switchover and supercapacitor longevity are essential.
FAQ
What is the operating temperature range for the LTC4041IUFD#PBF?
The LTC4041IUFD#PBF is rated for –40°C to 125°C junction temperature and is guaranteed over this full range. Its I-grade qualification ensures performance stability in industrial environments such as power meters and PLCs where ambient temperatures exceed 85°C. Thermal design must account for θJA = 43°C/W and mandatory soldering of the exposed GND pad to maintain reliability.
How does the LTC4041IUFD#PBF manage supercapacitor voltage balancing for two-series configurations?
The LTC4041IUFD#PBF uses an internal active balancer connected to the BAL pin that sources or sinks up to ±50mA to maintain equal voltage across two-series supercapacitors. When CAPSEL is high, the balancer drives BAL to 50% of VSCAP, with overvoltage protection triggering at 2.8V per cell and undervoltage at –20mV - eliminating external balancing resistors and reducing leakage-related drift.
Can the LTC4041IUFD#PBF support both single and dual supercapacitor configurations?
Yes, the LTC4041IUFD#PBF supports both configurations via the CAPSEL pin: tie CAPSEL to GND for single supercapacitor operation, or to >1.2V for two-series stack mode. In dual mode, the internal balancer engages automatically, and CAPFB feedback references the full stack voltage while BAL regulates the midpoint - enabling flexible design reuse across product variants.
What is the minimum backup time supported by the LTC4041IUFD#PBF, and how is it configured?
The LTC4041IUFD#PBF guarantees a minimum backup time (tMIN-BACKUP) of 2.2ms (typical) using a 1nF capacitor on the CPF pin. This parameter sets the forced-on duration of the boost regulator after power fail detection, preventing premature shutdown during brief input sags. Larger CPF values linearly increase tMIN-BACKUP, allowing precise tuning for application-specific hold-up requirements.
Does the LTC4041IUFD#PBF include overvoltage protection, and how is it implemented?
Yes, the LTC4041IUFD#PBF includes optional overvoltage protection (OVP) triggered when the OVSNS pin senses >6.4V (typical). It uses an internal charge pump to drive IGATE low, disabling external N-channel FETs in the input path. The OVP circuit draws only 40µA quiescent current and remains functional up to 60V transients - protecting the IC and downstream circuitry without external TVS diodes.
LTC4041IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Power Management
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC4041IUFD#PBF FAQ
1.How can I place an order for LTC4041IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4041IUFD#PBF 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 LTC4041IUFD#PBF reliable?
The price and inventory of LTC4041IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4041IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4041IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4041IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4041IUFD#PBF?
LTC4041IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4041IUFD#PBF 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 LTC4041IUFD#PBF?
For technical support, including LTC4041IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4041IUFD#PBF requirements.
6.How does Aetrix verify that LTC4041IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4041IUFD#PBF 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 LTC4041IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4041IUFD#PBF?
All LTC4041IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4041IUFD#PBF, 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 LTC4041IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4041IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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