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Analog Devices Inc. LTC3350IUHF
- Part No.:
- LTC3350IUHF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3350IUHF.pdf
- Description:
- IC BACKUP CTRLR CHRG/MON
- Quantity:
- Payment:
- Shipping:
Inventory:3,730
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Product details
Overview
LTC3350IUHF from Analog Devices is a high-current supercapacitor backup controller and system monitor for 1–4 series-stacked supercapacitors, supporting up to 35 V input, delivering >10 A boost output current, and featuring integrated real-time capacitance and ESR measurement via I²C/SMBus. It enables robust holdup in industrial energy metering, telecom infrastructure, and mission-critical embedded systems requiring ≥4 s of 36 W backup.
For engineers reviewing the LTC3350IUHF datasheet, LTC3350IUHF pinout, LTC3350IUHF application, or LTC3350IUHF equivalent, this page delivers verified technical context, validated pin functions, confirmed system-monitoring capabilities, and two field-validated alternative parts with documented functional trade-offs.
Technical Context
The LTC3350IUHF integrates a synchronous buck controller (for charging) and a synchronous boost controller (for backup discharge), both rated for >10 A peak current. Its internal 12-bit ADC measures stack voltage, current, capacitance, and ESR without interrupting operation.
It supports active cell balancing across up to four series-connected supercapacitors using external FETs, and implements programmable undervoltage/overvoltage lockout, thermal shutdown, and fault reporting via dedicated pins and I²C registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 35 V - supports wide-input industrial rails including 12 V and 24 V systems without pre-regulation. |
| VCAP Range | 1.2 V to 20 V - accommodates 1–4 stacked 2.7 V supercapacitors with programmable clamp voltage. |
| Boost Output Current | >10 A - delivers high-power backup to loads such as SRAM retention circuits or FPGA configuration memory. |
| Capacitance Measurement | Real-time, online C measurement - enables dynamic lifetime-aware voltage clamping to extend supercap life by up to 3× at elevated temperatures. |
| ESR Measurement | Integrated stack ESR calculation - allows predictive failure detection before EOL (70% C, 2× ESR) impacts holdup time. |
| Interface | I²C/SMBus - provides telemetry data (V, I, C, ESR) and configurable thresholds to host microcontroller without additional ADC or sense circuitry. |
Pinout & Package
The LTC3350IUHF is housed in a 38-lead, 5 mm × 7 mm QFN package with exposed thermal pad (UHF suffix), optimized for high-current power delivery and thermal dissipation in compact backup systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD | Power Good Indicator | Open-drain signal asserts high when VOUT is within regulation (±5%), enabling system-level power sequencing. |
| ALERT | Fault Reporting Pin | Active-low open-drain output signals overvoltage, undervoltage, overtemperature, or ESR/C measurement faults. |
| SCL/SDA | I²C Interface | Standard bidirectional I²C bus connection for reading telemetry and configuring thresholds, addresses, and balancing settings. |
| BOOSTGATE | Boost High-Side Gate Driver | Drives external N-channel MOSFET in boost stage; supports >10 A continuous output with external FET selection. |
| BALANCEx | Cell Balancing Control | Four dedicated outputs (BALANCE1–4) drive external balancing FETs to equalize voltage across each supercap in stack. |
| ISENSE+ | Current Sense Input | High-side current sense input referenced to VIN; used with external shunt to measure charge/discharge current with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Real-time supercapacitor health monitoring | On-the-fly capacitance and ESR measurement enables adaptive voltage clamping-reducing stress on new cells while maintaining holdup at end-of-life. |
| Programmable stack voltage clamp | Configurable per-cell clamp (e.g., 2.4 V) directly extends lifetime at +50°C by >2× vs. 2.7 V operation, per manufacturer lifetime curves. |
| External FET control architecture | Separate gate drivers for buck and boost stages allow optimization of RDS(on), thermal layout, and current rating beyond monolithic limits. |
| Active cell balancing | Independent BALANCEx outputs enable precision matching of voltages across 1–4 series cells-even with mismatched leakage or ESR-preventing overvoltage failure. |
Applications
| Industrial Energy Metering | Telecom Base Station Holdup |
|---|---|
Use Scenario: Maintains real-time clock and metrology data during AC mains interruption in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: Backup controller and system monitor ensuring ≥10 s holdup at 5 W using 4×10 F stack. Use Value: Eliminates need for separate battery management and analog sensing circuitry while providing lifetime-aware voltage control. | Use Scenario: Powers critical control logic and fronthaul interface during 48 V DC supply brownout in 4G/5G remote radio units. IC Role / Device Role / Timing Role: High-current boost controller delivering 36 W for 4 s from 4×25 F stack, with telemetry for predictive maintenance. Use Value: Achieves required holdup with 45 F total capacitance (vs. 75 F with discrete solution), reducing BOM cost and board area by 35%. |
| Military Data Recorder | PLC Controller Nonvolatile Save |
Use Scenario: Preserves flight telemetry and black-box data during engine-off power loss in avionics-grade recorders. IC Role / Device Role / Timing Role: Supercapacitor manager with MIL-STD-704E-compatible input range (18–32 V) and -40°C to +85°C operation. Use Value: Meets 5 s/20 W holdup requirement while reporting ESR drift to flag capacitor degradation before field failure. | Use Scenario: Safeguards ladder logic state and I/O configuration during unexpected AC loss in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Dual-role controller managing 2×15 F stack for 3.3 V/5 V rail backup with automatic recharging post-recovery. Use Value: Enables zero-data-loss shutdown via coordinated power-path control and host-triggered save sequence over I²C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supercapacitor backup controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3351IUHF | Includes integrated hot-swap controller with foldback current limiting; identical telemetry and backup architecture. | Required where live-insertion protection, inrush limiting, and short-circuit robustness are mandatory (e.g., modular telecom line cards). | Select LTC3351IUHF when board-level hot-swap compliance (IEC 61000-4-5) and fault containment are design priorities. |
| LTC4041IPUJ | Single-cell only (1–2.5 V VCAP), 2.5 A max boost current, no ESR/C measurement, 24-pin QFN. | Suitable for low-power IoT edge nodes (<5 W holdup) with space-constrained layouts and no lifetime telemetry needs. | Choose LTC4041IPUJ for cost-sensitive, single-supercap applications where real-time health monitoring is unnecessary. |
Compared with LTC3350IUHF, LTC3351IUHF adds hot-swap protection at identical telemetry and backup capability, while LTC4041IPUJ reduces complexity and cost for sub-5 W, single-cell use cases-but sacrifices stack scalability, high-current delivery, and predictive health analytics.
Availability
LTC3350IUHF is available at Aetrix Electronics and suitable for industrial energy metering, telecom base station holdup, and military data recorder applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LTC3350IUHF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3350 belongs to Analog Devices' Power by Linear™ supercapacitor manager product line, engineered specifically for high-reliability, long-duration backup systems where real-time capacitor health monitoring and adaptive voltage control are critical.
FAQ
What is the maximum number of supercapacitors the LTC3350IUHF can manage in series?
The LTC3350IUHF supports up to four supercapacitors connected in series, with independent balancing control per cell via BALANCE1–BALANCE4 pins. This configuration enables stack voltages up to 20 V (e.g., 4 × 5 V-rated cells) and ensures voltage matching under load, leakage, or temperature gradients-critical for preventing overvoltage failure in high-reliability backup systems using the LTC3350IUHF.
Does the LTC3350IUHF integrate both charging and backup power conversion?
Yes, the LTC3350IUHF integrates a synchronous buck controller for efficient supercapacitor charging from a 4.5 V–35 V input source, and a synchronous boost controller for regulated backup power delivery during main supply failure. Both controllers support >10 A peak current using external FETs, and the LTC3350IUHF manages seamless transition between modes without host intervention.
How does the LTC3350IUHF perform real-time capacitance and ESR measurement?
The LTC3350IUHF uses its integrated 12-bit ADC and proprietary algorithm to inject controlled current pulses into the supercapacitor stack, then measures resulting voltage transients to compute capacitance and equivalent series resistance-all while the system remains online and operational. This telemetry is accessible via I²C, enabling host firmware to adapt clamp voltage dynamically and extend lifetime, a core capability of the LTC3350IUHF.
What package type and thermal characteristics does the LTC3350IUHF use?
The LTC3350IUHF is packaged in a 38-lead, 5 mm × 7 mm QFN (UHF) with exposed thermal pad, rated for operation from –40°C to +125°C junction temperature. Its layout-optimized pinout and thermal pad support >3 W power dissipation in standard 2-layer PCBs, making it suitable for compact, convection-cooled backup modules where the LTC3350IUHF must sustain high-current boost operation.
Can the LTC3350IUHF replace a battery-based backup solution?
Yes-the LTC3350IUHF is designed to replace lithium-ion or NiMH batteries in short-to-medium duration backup applications (e.g., 2–10 s holdup at 10–50 W). It eliminates battery aging, thermal runaway risk, and regulatory shipping constraints, while delivering higher cycle life (>100,000 cycles) and faster recharge. For systems currently using batteries, the LTC3350IUHF offers a drop-in-capable architecture when paired with appropriate supercapacitor stacks and external FETs.
LTC3350IUHF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Supercapacitor Backup Controller
- Current - Supply:
- 4mA
- Voltage - Supply:
- 4.5V ~ 35V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3350IUHF FAQ
1.How can I place an order for LTC3350IUHF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3350IUHF 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 LTC3350IUHF reliable?
The price and inventory of LTC3350IUHF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3350IUHF is usually 5 days.
3.What payment methods are accepted for LTC3350IUHF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3350IUHF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3350IUHF?
LTC3350IUHF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3350IUHF 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 LTC3350IUHF?
For technical support, including LTC3350IUHF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3350IUHF requirements.
6.How does Aetrix verify that LTC3350IUHF is sourced from the original manufacturer or authorized distributors?
All LTC3350IUHF 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 LTC3350IUHF meets industry standards.
7.What is the process for return or replacement of LTC3350IUHF?
All LTC3350IUHF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3350IUHF, 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 LTC3350IUHF part is unused and in its original packaging.
Return procedure for LTC3350IUHF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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