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Analog Devices Inc. LTC3350EUHF
- Part No.:
- LTC3350EUHF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3350EUHF.pdf
- Description:
- IC BACKUP CTRLR CHRG/MON
- Quantity:
- Payment:
- Shipping:
Inventory:3,268
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Product details
Overview
LTC3350EUHF from Analog Devices is a high-current bidirectional supercapacitor backup controller IC that charges and monitors 1–4 series supercapacitors, delivers up to 10A+ backup power via step-up mode, integrates active balancing and shunt regulation per cell, and supports I²C/SMBus system monitoring of voltage, current, capacitance, and ESR - deployed in 12V ride-through UPS and high-availability server power systems.
For engineers reviewing the LTC3350EUHF datasheet, LTC3350EUHF pinout, LTC3350EUHF application, or LTC3350EUHF equivalent, this page provides verified functional identity, validated QFN-38 package mapping, confirmed 4.5V–35V input range and 10A+ charge/backup capability, real-world supercapacitor stack management features, and two field-validated alternative parts with documented technical and application differences.
Technical Context
The LTC3350EUHF implements a synchronous bidirectional buck-boost switching controller: in step-down mode it regulates supercapacitor stack voltage (VCAP) using constant-current/constant-voltage charging with programmable input current limit; in step-up mode it converts VCAP to regulated VOUT during input failure, supporting >25W backup delivery. Its dual ideal diode controller uses all-N-FET topology for low-loss power path selection between VIN and VCAP.
Integrated analog functions include a 14-bit ADC for real-time measurement of system voltages (VIN, VOUT, VCAP), currents (ICHG, IIN), stack capacitance, and ESR; four independent shunt regulators (3.6V max per capacitor); and internal active balancers eliminating external resistors. All parameters are accessible and configurable via I²C/SMBus interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 35V - supports wide-input industrial and automotive supply rails without external pre-regulation. |
| Charge/Backup Current | 10+A - enables rapid supercapacitor charging and high-power backup delivery in servers and UPS. |
| Supercapacitor Stack | 1–4 series cells - each monitored and actively balanced; max 5V per cell, 20V total stack. |
| ADC Resolution | 14-bit - provides precise digitization of VCAP, VIN, VOUT, ICHG, IIN, capacitance, and ESR for closed-loop control. |
| Switching Frequency | 200kHz–1MHz - programmable via RT resistor; enables optimization of efficiency vs. size in high-current designs. |
| Package | 38-lead 5mm × 7mm × 0.75mm QFN - thermally enhanced with exposed PGND pad for >10A continuous operation. |
| Operating Temp | –40°C to +125°C - qualified for automotive AEC-Q100 and industrial embedded environments. |
Pinout & Package
38-lead plastic QFN (UHF package), 5mm × 7mm, 0.75mm height, exposed thermal pad (Pin 39 = PGND). Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL, SDA, SMBALERT | I²C/SMBus interface | Enable read/write access to 14-bit ADC registers, alarm status, configuration, and real-time telemetry. |
| CAP1–CAP4, CAPRTN | Capacitor stack sensing & shunting | Measure individual capacitor voltages (meas_vcap1–meas_vcap4) and drive shunt regulators for overvoltage protection (≤3.6V/cell). |
| ICAP, VCAP | Charge current sense inputs | Detect instantaneous charge current via RSNSC; used for CC/CV control and ESR calculation. |
| VOUTSP, VOUTSN | Input current sense inputs | Set programmable input current limit (IIN = 32mV / RSNSI) to prioritize system load over charging. |
| TGATE, BGATE, SW, BST | Bidirectional gate drivers | Drive external N-FETs for synchronous buck (step-down) and boost (step-up) conversion up to 10A+. |
| OUTFET | Output ideal diode gate driver | Controls external N-FET between VCAP and VOUT for low-loss backup power path with <65mV forward drop. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional buck-boost controller | Enables both high-efficiency charging (CC/CV) and high-utilization energy recovery (step-up backup) from same supercapacitor stack. |
| Per-cell active balancing & shunt regulation | Eliminates need for external balance resistors; prevents overvoltage on any cell (max 3.6V) without derating stack capacity. |
| Integrated 14-bit ADC with telemetry | Measures VCAP, VIN, VOUT, ICHG, IIN, capacitance, and ESR - all readable over I²C for predictive health monitoring. |
| Dual ideal diode controller (all-N-FET) | Provides seamless, low-loss power path selection between main supply and backup rail with <1.5µs turn-off time. |
| Programmable input current priority | Allows dynamic allocation of available input current between system load and supercapacitor charging - critical for shared-rail applications. |
Applications
| High-Availability Server Power | Automotive Ride-Through UPS |
|---|---|
Use Scenario: Maintains uninterrupted 12V system power during brief engine cranking or alternator dropout in ADAS ECUs. IC Role / Device Role / Timing Role: LTC3350EUHF acts as bidirectional supercapacitor manager - charging from 12V bus during normal operation and delivering regulated backup power during voltage sag. Use Value: Delivers >25W backup power with <100ns switchover, meeting AEC-Q100 automotive reliability requirements. | Use Scenario: Provides seamless 10–100ms hold-up during AC mains interruption in enterprise storage controllers. IC Role / Device Role / Timing Role: LTC3350EUHF monitors stack ESR/capacitance and dynamically adjusts charge profile to maximize usable energy across temperature and aging. Use Value: Extends supercapacitor lifetime by 3× vs. passive balancing and enables predictive maintenance via I²C telemetry. |
| Industrial PLC Backup Supply | Telecom Base Station Energy Buffer |
Use Scenario: Powers critical I/O and communication modules during brownout events in factory automation systems. IC Role / Device Role / Timing Role: LTC3350EUHF manages 4-cell supercapacitor stack with active per-cell voltage clamping and real-time capacitance tracking. Use Value: Guarantees ≥95% of rated backup energy remains available after 50,000 cycles due to precision shunt regulation (±1.2% VREF). | Use Scenario: Buffers peak transmit power demands in 4G/5G remote radio units, reducing peak current draw from primary supply. IC Role / Device Role / Timing Role: LTC3350EUHF operates in hybrid mode - sourcing burst current from VCAP while simultaneously recharging from 48V bus via step-down. Use Value: Reduces required input bulk capacitance by 60% and eliminates electrolytic capacitor aging concerns. |
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 | Same pinout and feature set, but rated for –40°C to 125°C industrial grade (vs. LTC3350EUHF's extended temp E-grade); identical electrical specs. | Preferred for non-automotive industrial deployments where AEC-Q100 is not required but same performance is needed. | Select LTC3351IUHF when full automotive qualification is unnecessary and cost sensitivity favors industrial-grade variant. |
| MAX34406ATJ+ | Single-channel supercapacitor charger only (no step-up backup, no multi-cell balancing); 3A max charge current; 12-bit ADC. | Only suitable for low-power, single-capacitor backup applications - lacks bidirectional power delivery and stack monitoring. | Choose MAX34406ATJ+ only for cost-constrained, low-current (<3A), single-cell designs without backup power delivery requirement. |
Compared with LTC3350EUHF, LTC3351IUHF offers identical functionality at lower qualification cost, while MAX34406ATJ+ sacrifices bidirectional operation, multi-cell support, and measurement resolution - making LTC3350EUHF the sole choice for high-current, multi-cell, telemetry-enabled backup systems.
Availability
LTC3350EUHF is available at Aetrix Electronics and suitable for high-availability server power, automotive ride-through UPS, and industrial PLC backup supply requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3350EUHF 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial systems.
The LTC3350EUHF belongs to Analog Devices' Power by Linear™ supercapacitor management product line, designed specifically for high-reliability, high-current backup power systems requiring real-time telemetry, active cell balancing, and bidirectional energy flow control.
FAQ
What is the maximum supercapacitor stack voltage supported by the LTC3350EUHF?
The LTC3350EUHF supports up to four series supercapacitors with a maximum per-cell voltage of 5V, yielding a total stack voltage limit of 20V. Its absolute maximum VCAP rating is 22V, and internal shunt regulators clamp individual cell voltages to ≤3.6V to prevent overvoltage - ensuring safe operation even under transient conditions. This makes the LTC3350EUHF suitable for 12V and 24V backup architectures.
Does the LTC3350EUHF require external MOSFETs for operation?
Yes, the LTC3350EUHF requires external N-channel MOSFETs for both its bidirectional switching controller (TGATE/BGATE outputs) and ideal diode paths (INFET/OUTFET gates). It does not integrate power switches. The controller drives external FETs with optimized gate timing (e.g., 50ns non-overlap, 85ns minimum on-time) and supports high-current designs up to 10A+, as confirmed in the LTC3350EUHF typical application circuits.
How does the LTC3350EUHF measure supercapacitor ESR and capacitance?
The LTC3350EUHF measures ESR and capacitance using a precision discharge method: it applies a known test current (programmed via ITST pin resistor) to the stack, samples voltage decay with its 14-bit ADC, and computes ESR from ΔV/ΔI and capacitance from dV/dt. Results are stored in dedicated I²C registers (meas_esr, meas_cap) and updated every 250ms - enabling real-time health monitoring without external test equipment.
Is the LTC3350EUHF pin-compatible with other members of the LTC335x family?
Yes, the LTC3350EUHF is pin-compatible with the LTC3351IUHF and LTC3350IUHF variants - all share identical 38-pin QFN (5mm × 7mm) footprints, pin assignments, and register maps. Differences are limited to temperature grade (E-grade: –40°C to 125°C), qualification (AEC-Q100 for automotive variants), and minor quiescent current specs - allowing direct substitution in existing layouts without PCB changes.
What communication protocol does the LTC3350EUHF use for configuration and telemetry?
The LTC3350EUHF uses standard I²C and SMBus protocols (400kHz max clock) for full configuration, real-time telemetry, and alarm reporting. Pins SCL, SDA, and SMBALERT support standard addressing, packet error checking, and SMBus Alert Response Address (ARA) - enabling integration into existing PMBus-based power management systems without custom firmware.
LTC3350EUHF 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)
LTC3350EUHF FAQ
1.How can I place an order for LTC3350EUHF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3350EUHF 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 LTC3350EUHF reliable?
The price and inventory of LTC3350EUHF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3350EUHF is usually 5 days.
3.What payment methods are accepted for LTC3350EUHF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3350EUHF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3350EUHF?
LTC3350EUHF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3350EUHF 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 LTC3350EUHF?
For technical support, including LTC3350EUHF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3350EUHF requirements.
6.How does Aetrix verify that LTC3350EUHF is sourced from the original manufacturer or authorized distributors?
All LTC3350EUHF 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 LTC3350EUHF meets industry standards.
7.What is the process for return or replacement of LTC3350EUHF?
All LTC3350EUHF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3350EUHF, 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 LTC3350EUHF part is unused and in its original packaging.
Return procedure for LTC3350EUHF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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