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Analog Devices Inc. LTC4041EUFD#PBF
- Part No.:
- LTC4041EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC4041EUFD#PBF.pdf
- Description:
- IC BATT PWR MGMT MULTI 1C 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,777
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Product details
Overview
LTC4041EUFD#PBF from Analog Devices is a 2.5A supercapacitor backup power manager IC for 2.9V–5.5V supply rails. It integrates a synchronous step-down charger (2.25MHz, 2.5A) and reverse-operating step-up backup regulator (2.5A), with internal supercapacitor balancing, programmable charge voltage/current, and input current limiting to protect upstream supplies. It enables seamless ride-through in industrial power meters and SSDs during brief AC loss.
For engineers reviewing the LTC4041EUFD#PBF datasheet, LTC4041EUFD#PBF pinout, LTC4041EUFD#PBF application, or LTC4041EUFD#PBF equivalent, key selection criteria include its dual-mode buck/boost topology, 24-pin 4mm×5mm QFN package with exposed thermal pad, 2.5A continuous backup capability from single or stacked supercapacitors, and integrated PFI/PFO/SYSGD status signaling.
Technical Context
The LTC4041EUFD#PBF implements a bidirectional DC/DC architecture: in normal mode, its 2.25MHz synchronous buck converter charges supercapacitors from VSYS; in backup mode, the same power stage reverses to operate as a 1.125MHz boost regulator delivering up to 2.5A from SCAP to VSYS. It uses internal current-sense amplification (AV = 32) on the CLN–VIN path and precision comparators (PFI threshold = 1.19V ±20mV, RSTFB = 0.74V ±10mV) for autonomous mode switching.
Its supercapacitor management includes an active balancer (±50mA source/sink, 50% VSCAP balance point), CAPGD and CAPFLT open-drain status pins with defined over/under-voltage thresholds (2.7V/–20mV), and programmable recharge (97.5% of VCHG). The IGATE driver supports external N-MOSFETs for input disconnect and optional OVP (6.4V cutoff).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - supports direct connection to 3.3V or 5V system rails without level-shifting. |
| Buck Charging Current | Up to 2.5A - programmable via PROG pin resistor; enables fast charging of 10F+ supercapacitors. |
| Boost Backup Current | 2.5A continuous - delivers stable VSYS output during input failure; supported by 5.5A NMOS switch limit. |
| Switching Frequencies | Buck: 2.25MHz / Boost: 1.125MHz - high-frequency operation allows compact 2.2µH inductors and low-profile layouts. |
| Supercapacitor Balancing | Internal ±50mA balancer - eliminates need for external resistive dividers; maintains ≤2.7V per cell in 2-cell stacks. |
| Quiescent Current (Backup) | 75–150µA at VSYS - ultra-low sleep current extends backup runtime in battery-assisted systems. |
| OVP Threshold | 6.4V typical (via OVSNS) - protects IC from transients up to 7V; compatible with >60V transient immunity designs. |
Pinout & Package
Package: 24-lead 4mm × 5mm × 0.75mm plastic QFN with exposed thermal pad (Pin 25 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSYS (Pins 1, 24) | System output rail | Primary power delivery node; supplies load and charges SCAP; requires ≥100µF low-ESR ceramic bypass. |
| PROG (Pin 2) | Charge current programming | Sets full-scale charge current (ICHG = 0.8V/RPROG); servo voltage = 0.8V; ratio hPROG = 2500 mA/mA. |
| IMON (Pin 3) | Input current monitoring | Voltage = 32 × (VIN – CLN); triggers charge current reduction when ≥0.8V to prioritize system load. |
| CHGEN (Pin 4) | Charger enable control | Logic low (≤0.4V) enables buck charger; high (>1.2V) disables it - no floating allowed. |
| BSTEN (Pin 5) | Boost backup enable control | Logic low enables backup mode; high disables boost - used for controlled shutdown or system-level sequencing. |
| VIN (Pin 6) | Main input supply | Accepts 2.9–5.5V; connects directly if OVP unused, or via external FET if OVP enabled. |
| CLN (Pin 7) | Current sense negative | Forms differential pair with VIN; sets 25mV input current limit threshold across external RS. |
| CAPFB (Pin 12) | Supercapacitor voltage feedback | Servo voltage = 0.8V; programs VCHG via external divider; enables CV termination at 12.5% ICHG. |
| CAPGD (Pin 13) | Capacitor power-good indicator | Open-drain output pulled low until VSCAP reaches 92.5% of regulation point. |
| PFO (Pin 14) | Power-fail status output | Open-drain signal pulled low when PFI < 1.19V; indicates imminent backup mode transition. |
| IGATE (Pin 15) | External FET gate driver | Charge-pump driven; controls input disconnect FET and optional OVP FET; outputs ~9.4–12V. |
| OVSNS (Pin 16) | OVP sense input | Detects overvoltage via 6.2k resistor; activates IGATE shutdown when >6.4V; draws 40µA quiescent. |
| CPF (Pin 17) | Minimum backup time program | Capacitor sets tMIN-BACKUP (e.g., 1nF = 2.2ms); prevents spurious mode toggling during brownouts. |
| BSTFB (Pin 18) | Boost output voltage feedback | Servo voltage = 0.8V; programs VSYS backup voltage (2.7–5.0V range) via external divider. |
| PFI (Pin 19) | Power-fail input comparator | High-impedance input; 1.19V falling threshold with 40mV hysteresis; initiates backup when VIN drops. |
| CAPSEL (Pin 20) | Capacitor stack configuration | Ground = single supercapacitor; >1.2V = two in series - configures balancer and fault thresholds. |
| SW (Pins 21, 22) | Power switch nodes | Shared buck/boost switching node; connects to inductor (2.2µH typical) between SW and SCAP. |
| SCAP (Pin 23) | Supercapacitor terminal | Connects to top of single cap or 2-cap stack; voltage range: 0–5.4V; monitored for balancing/faults. |
| GND (Pin 25) | Thermal & electrical ground | Exposed pad; must be soldered to PCB ground plane for thermal dissipation (θJC = 3.4°C/W) and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bidirectional power conversion | Single IC performs both supercapacitor charging (buck) and system backup (boost), eliminating discrete controller + MOSFET complexity. |
| Programmable input current limit | Adjustable via CLN–VIN sense resistor; ensures system load always takes priority over charging current. |
| Automatic seamless switchover | No external control needed - transitions from normal to backup mode within microseconds when PFI falls below threshold. |
| Active supercapacitor balancing | On-chip ±50mA balancer maintains equal voltage across cells in 2-cap stacks without external resistors or ICs. |
| Configurable minimum backup duration | CPF pin capacitor sets tMIN-BACKUP (e.g., 2.2ms), preventing oscillation during marginal input conditions. |
| Robust protection suite | Includes OVP (6.4V), overtemperature shutdown (160°C), SCAP over/under-voltage detection, and open-drain fault indicators. |
Applications
| Industrial Power Meters | Solid-State Drives (SSDs) |
|---|---|
Use Scenario: Maintains real-time clock and metering data integrity during brief AC line interruptions (e.g., 10–100ms grid dips). IC Role / Device Role / Timing Role: Acts as backup power source and supervisor - monitors VIN via PFI, asserts PFO before dropout, and powers VSYS from SCAP during outage. Use Value: Enables deterministic 3.3V/5V hold-up for >100ms using a single 10F supercapacitor, meeting ANSI C12.1 and IEC 62053 standards. | Use Scenario: Preserves DRAM cache and NAND flash write buffers during unexpected power loss to prevent data corruption. IC Role / Device Role / Timing Role: Provides controlled 2.5A backup current to VSYS rail; uses CPF-programmed minimum on-time to avoid premature shutdown during transient sags. Use Value: Guarantees ≥20ms clean shutdown window at 1A load, supporting enterprise-grade power-loss protection (PLP) compliance. |
| Server Baseboard Management | Industrial Alarms & Sensors |
Use Scenario: Powers BMC (Baseboard Management Controller) during main PSU failure to log fault events and maintain IPMI communication. IC Role / Device Role / Timing Role: Functions as intelligent backup manager - isolates input via IGATE-driven FET, regulates VSYS via BSTFB loop, and signals status via SYSGD/CAPGD. Use Value: Delivers stable 3.3V at 2A for ≥50ms using two 5F supercapacitors in series, enabling remote diagnostics post-failure. | Use Scenario: Keeps wireless sensor nodes operational during battery replacement or solar charging gaps in remote monitoring systems. IC Role / Device Role / Timing Role: Serves as low-quiescent-energy backup supervisor - draws only 75µA in backup sleep mode while monitoring SCAP health. Use Value: Extends usable backup time by 3× vs. discrete solutions due to 1µA SCAP leakage and integrated balancer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supercapacitor backup power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX32664AELB+ | Integrated ARM Cortex-M0+ MCU with fuel-gauge ADC; lower backup current (1.5A); no internal balancer. | Targeted at smart sensors with embedded firmware; requires external balancer for 2-cell stacks. | Select when firmware-controlled state management and telemetry are required alongside backup. |
| BQ33100EVM-657 | Standalone supercapacitor manager with 3A boost; no buck charger; requires external DC/DC for charging. | Designed for high-current backup-only use cases; lacks integrated charging path and PFI-based auto-switching. | Select when charging is handled separately (e.g., by system PMIC) and only robust backup is needed. |
Compared with MAX32664AELB+ and BQ33100EVM-657, the LTC4041EUFD#PBF uniquely combines high-current bidirectional conversion, autonomous analog mode switching, and integrated balancing in a single QFN - reducing BOM count by ≥4 components and eliminating firmware dependency for basic ride-through.
Availability
LTC4041EUFD#PBF is available at Aetrix Electronics and suitable for industrial power meters, solid-state drives, server baseboard management controllers, and remote sensor alarm systems requiring stable component supply and long-term lifecycle support.
Supply support for LTC4041EUFD#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 LTC4041EUFD#PBF belongs to ADI's Power Management product line, engineered specifically for high-reliability backup power applications where seamless switchover, supercapacitor longevity, and minimal external components are critical design requirements.
FAQ
What is the maximum supercapacitor voltage supported by the LTC4041EUFD#PBF?
The LTC4041EUFD#PBF supports a maximum supercapacitor voltage of 5.4V. This applies whether using a single supercapacitor or two in series (with CAPSEL high). The internal balancer maintains ≤2.7V per cell in stacked configurations, and the CAPFLT pin asserts fault if any cell exceeds 2.7V. Absolute maximum rating at SCAP is 6V, but functional operation is limited to 5.4V per datasheet specifications.
How does the LTC4041EUFD#PBF handle input current limiting during simultaneous system load and charging?
The LTC4041EUFD#PBF uses the IMON amplifier to monitor (VIN – CLN) voltage across an external sense resistor. When the resulting IMON voltage reaches 0.8V, the IC reduces programmed charge current to ensure the total input current never exceeds the limit set by RS. System load is always prioritized - charging only occurs with residual current capacity after load demand is met.
Can the LTC4041EUFD#PBF operate with only one supercapacitor, and how is that configured?
Yes, the LTC4041EUFD#PBF fully supports single-supercapacitor operation. Configure this by grounding the CAPSEL pin (Pin 20). In this mode, the internal balancer is disabled, CAPFLT monitors total SCAP voltage against 2.7V/–20mV thresholds, and CAPFB feedback sets the full-stack charge voltage (e.g., 4.5V for a 10F cap). Pin BAL (Pin 9) must be left unconnected.
What is the purpose of the CPF pin on the LTC4041EUFD#PBF, and how is it used?
The CPF pin (Pin 17) programs the minimum backup time (tMIN-BACKUP) to prevent oscillation during marginal input conditions. A capacitor (e.g., 1nF = 2.2ms) is connected from CPF to GND. During backup initiation, the LTC4041EUFD#PBF ignores the PFI comparator for this duration, ensuring the boost regulator remains active long enough to stabilize VSYS before evaluating recovery.
Does the LTC4041EUFD#PBF require external MOSFETs, and if so, for what functions?
Yes, the LTC4041EUFD#PBF requires at least one external N-channel MOSFET connected between VIN and VSYS, driven by IGATE (Pin 15), to isolate the system during backup mode. A second optional FET can be added between VPWR and VIN for overvoltage protection (OVP), also controlled by IGATE. Both FETs must be logic-level types capable of handling ≥3A continuous current and rated for ≥20V VDS.
LTC4041EUFD#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)
LTC4041EUFD#PBF FAQ
1.How can I place an order for LTC4041EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4041EUFD#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 LTC4041EUFD#PBF reliable?
The price and inventory of LTC4041EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4041EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4041EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4041EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4041EUFD#PBF?
LTC4041EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4041EUFD#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 LTC4041EUFD#PBF?
For technical support, including LTC4041EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4041EUFD#PBF requirements.
6.How does Aetrix verify that LTC4041EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4041EUFD#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 LTC4041EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4041EUFD#PBF?
All LTC4041EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4041EUFD#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 LTC4041EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4041EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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