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Analog Devices Inc. LT3514EUFD#TRPBF
- Part No.:
- LT3514EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3514EUFD#TRPBF.pdf
- Description:
- IC REG BCK ADJ 2A/1A TRPL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,791
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Product details
Overview
LT3514EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output synchronous buck switching regulator IC with 2A/1A/1A output capability, wide 3.2V–36V input range, and integrated boost regulator enabling true 100% duty cycle operation for each channel. It features independent soft-start/run pins, power-good indication, output voltage tracking, and operates in automotive battery, industrial control, and distributed supply regulation systems.
For engineers reviewing the LT3514EUFD#TRPBF datasheet, LT3514EUFD#TRPBF pinout, LT3514EUFD#TRPBF application, or LT3514EUFD#TRPBF equivalent, key selection criteria include verified 28-lead QFN (4mm × 5mm) thermal performance, confirmed 800mV feedback reference, validated 350kHz–2.2MHz SYNC range, and documented channel-specific current limits (SW3: 3.0–4.2A; SW1/SW4: 1.45–2.1A).
Technical Context
The LT3514EUFD#TRPBF integrates three independent buck regulators (CH1: 1A, CH3: 2A, CH4: 1A) driven by a dedicated on-chip boost regulator (CH5) that generates SKY voltage at VIN + 4.85V to fully saturate internal bipolar switches. Each channel uses cycle-by-cycle peak current limiting and catch diode current sensing for overload protection.
It supports resistor-programmed constant-frequency operation (250kHz–2.5MHz) or external synchronization (350kHz–2.2MHz), anti-phase switching between CH3/CH4 and CH1 to reduce input ripple, and independent RUN/SS pins enabling precise output sequencing and tracking via external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 36V (40V transient rating); enables direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Output Current Capability | CH1: 1A, CH3: 2A, CH4: 1A - verified per channel under full temperature range with thermal shutdown protection. |
| Feedback Reference Voltage | 790–816mV (min/max over temp); enables accurate output programming using standard resistor dividers (e.g., R2 = 10.2kΩ). |
| Switching Frequency Range | 250kHz to 2.5MHz (resistor-programmed) or 350kHz to 2.2MHz (SYNC); allows optimization of size vs. efficiency in space-constrained designs. |
| Channel-Specific Current Limits | SW3: 3.0–4.2A typ/max; SW1/SW4: 1.45–2.1A typ/max - ensures robust short-circuit and overload handling per output path. |
| Thermal Performance | θJA = 43°C/W (28-lead QFN); requires exposed pad soldered to PCB ground plane with thermal vias for reliable 125°C junction operation. |
| Power Good Threshold | PG asserts when all FB pins exceed 710mV; provides system-level power sequencing confirmation with 65–125mV hysteresis. |
Pinout & Package
Tiny 28-lead (4mm × 5mm) thermally enhanced plastic QFN package with exposed pad (Pin 29) tied to GND - must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 10, 18, 27, 29) | Ground reference and thermal path | Multiple GND pins plus exposed pad ensure low-impedance return and heat dissipation; pad must be soldered to PCB ground plane. |
| VIN (Pins 9, 11, 26, 28) | Main input power supply | Four parallel VIN pins reduce IR drop and improve current sharing; must be locally bypassed to GND near pins 27/10. |
| SW1, SW3, SW4 (Pins 4, 5, 7) | Buck switch node outputs | Direct connection points to external inductors and Schottky diode cathodes; SW3 handles 2A load, SW1/SW4 handle 1A each. |
| DA1, DA3, DA4 (Pins 3, 6, 8) | Catch diode anode return | Internal comparator monitors diode current to prevent inductor current runaway during transients; connects to diode anodes. |
| RUN/SS1, RUN/SS3, RUN/SS4 (Pins 12, 13, 15) | Per-channel enable & soft-start | Each pin sources 1.3µA to charge external capacitor; pulling below 0.1V shuts down respective channel independently. |
| EN/UVLO (Pin 16) | Global enable & input UVLO | 1.44V rising threshold with 110mV hysteresis; pulls part into <2µA shutdown when held <0.7V; also serves as accurate UVLO trigger. |
| RT/SYNC (Pin 17) | Oscillator control | Accepts resistor-to-GND for frequency setting (e.g., 18.2kΩ = 1MHz) or external clock signal (350kHz–2.2MHz, >50ns pulse width). |
| FB1, FB3, FB4 (Pins 19, 20, 21) | Output voltage feedback | Each regulated to 800mV nominal; connects to resistor divider (R1/R2) to set VOUT; R2 = 10.2kΩ recommended for accuracy. |
| PG (Pin 23) | Power good open-collector output | Active-low indicator asserting only when all three FB voltages exceed 710mV; disabled during shutdown. |
| SW5 (Pin 24) | Boost regulator switch output | Drives external inductor to generate SKY voltage; internal 0.4A switch with cycle-by-cycle current limit and diode current sensing. |
| SKY (Pin 25) | Boost regulator output rail | Provides VIN + 4.85V drive voltage for buck switches; requires 1µF capacitor to VIN; no external loading permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck regulation | CH1 (1A), CH3 (2A), CH4 (1A) with separate RUN/SS, FB, and DA pins enables flexible multi-rail power sequencing and fault isolation. |
| 100% duty cycle support | Integrated boost regulator (CH5) delivers SKY = VIN + 4.85V, allowing full saturation of internal bipolar switches even at ultra-low dropout. |
| Anti-phase switching | CH3/CH4 operate 180° out-of-phase with CH1, reducing input capacitor RMS current and minimizing conducted EMI at the source. |
| Programmable undervoltage lockout | EN/UVLO pin provides adjustable startup threshold (1.2–1.6V) with 110mV hysteresis - eliminates brown-in/brown-out glitches during rail ramp-up. |
| Internal compensation | Single-pole compensation network embedded per channel reduces external component count and simplifies stability tuning across operating conditions. |
| Robust fault protection | Cycle-by-cycle current limit, catch diode current limit, thermal shutdown, and soft-start current limiting prevent damage during overload, short-circuit, or startup surges. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Powering infotainment head units, ADAS camera modules, and body control modules from 9V–16V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Triple-buck regulator delivering isolated 1.8V (core), 3.3V (I/O), and 5V (peripheral) rails with independent sequencing and 100% DC capability during cranking. Use Value: Maintains regulation down to 3.2V input, eliminating need for external pre-regulators; SKY boost ensures stable gate drive even at 6V battery sag. |
Use Scenario: Providing clean, sequenced power to PLC I/O modules, motor drivers, and sensor interfaces in factory automation equipment. IC Role / Device Role / Timing Role: Central power management IC generating multiple isolated rails with programmable start-up order and power-good confirmation. Use Value: Independent RUN/SS pins enable precise voltage ramp control; PG pin signals system controller only after all outputs reach regulation. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Converting unregulated 5V–24V wall adapter outputs into tightly regulated 1.2V, 3.3V, and 5V rails for consumer electronics and IoT gateways. IC Role / Device Role / Timing Role: High-efficiency triple buck converter with minimal external components, supporting wide input range and light-load efficiency via Burst Mode™. Use Value: 3.2V–36V input range accepts universal AC/DC adapters; 800mV FB reference enables accurate low-voltage outputs with standard resistors. |
Use Scenario: Local point-of-load regulation in telecom base stations, servers, and medical imaging systems where centralized 12V/48V backplanes feed multiple subsystems. IC Role / Device Role / Timing Role: Compact, thermally optimized POL regulator delivering high-current 3.3V (2A) and auxiliary 1.8V/5V rails with minimal board area. Use Value: 28-lead QFN package with θJA = 43°C/W supports high-density layouts; anti-phase switching cuts input capacitor stress in multi-rail deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3375EFE#TRPBF | Octal 1A buck (configurable as 3-output), 2.25V–5.5V input, integrated MOSFETs, I²C programmable. | Lower input range; suited for sub-5V systems (e.g., FPGA core banks); lacks 100% DC capability and SKY boost architecture. | Select when digital configurability, lower input voltage, or higher integration (MOSFETs) outweighs wide-input and 100% duty cycle needs. |
| MPQ4436AGL-AEC1-Z | Triple 3A/3A/2A buck, 3.3V–36V input, AEC-Q100 Grade 1, no integrated boost, fixed 800mV FB. | Higher per-channel current, automotive qualified, but no 100% duty cycle support; requires external gate driver bias for low-VIN operation. | Select for AEC-Q100 compliance and higher current demands where 100% DC is not required; verify external bias solution for <4V dropout. |
Compared with LTC3375EFE#TRPBF and MPQ4436AGL-AEC1-Z, the LT3514EUFD#TRPBF uniquely delivers verified 100% duty cycle operation across all three channels via its integrated SKY boost regulator - critical for maintaining regulation during automotive cold-crank or industrial brownout events where input may dip below output voltages.
Availability
LT3514EUFD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LT3514EUFD#TRPBF 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 acquired Linear Technology in 2017, inheriting its legacy of high-performance analog and power management ICs with emphasis on reliability, precision, and ruggedness.
The LT3514EUFD#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for demanding industrial and automotive applications requiring wide input range, robust fault protection, and seamless operation during voltage sags.
FAQ
What is the maximum input voltage rating for the LT3514EUFD#TRPBF?
The LT3514EUFD#TRPBF has an absolute maximum input voltage rating of 40V, with continuous operation supported from 3.2V to 36V. Transient inputs up to 40V are tolerated, but startup above 36V is discouraged due to instantaneous power dissipation risks that may exceed the 125°C junction limit. The LT3514EUFD#TRPBF maintains regulation across this full range using its internal boost regulator to sustain gate drive voltage.
Does the LT3514EUFD#TRPBF support 100% duty cycle operation on all channels?
Yes, the LT3514EUFD#TRPBF supports true 100% duty cycle operation on all three buck channels (CH1, CH3, CH4) via its integrated boost regulator (CH5), which generates SKY voltage at VIN + 4.85V. This ensures full saturation of internal bipolar power switches even when input voltage approaches or equals output voltage - a critical capability for automotive cold-crank and industrial brownout resilience. The LT3514EUFD#TRPBF datasheet confirms this behavior in both typical waveforms and absolute maximum ratings.
What is the function of the SKY pin on the LT3514EUFD#TRPBF?
The SKY pin on the LT3514EUFD#TRPBF is the output of the integrated boost regulator, providing a stabilized voltage equal to VIN + 4.85V. It supplies gate drive current to all three internal buck power switches and must be decoupled with a 1µF capacitor to VIN. External loading or voltage injection on SKY is strictly prohibited - doing so may damage the LT3514EUFD#TRPBF. The SKY voltage enables 100% duty cycle operation and efficient switch saturation across the full input range.
How does the LT3514EUFD#TRPBF implement output voltage tracking and sequencing?
The LT3514EUFD#TRPBF implements output voltage tracking and sequencing through its independent RUN/SS pins (RUN/SS1, RUN/SS3, RUN/SS4). Connecting a resistor divider from a master output to a RUN/SS pin causes that channel's soft-start ramp to follow the master rail's voltage trajectory. An internal 1.3µA current source charges external capacitors tied to these pins, enabling programmable ramp rates. This allows precise power-up/down ordering and voltage alignment between rails - a feature confirmed in the LT3514EUFD#TRPBF block diagram and applications information section.
What thermal design considerations apply to the LT3514EUFD#TRPBF in its 28-lead QFN package?
The LT3514EUFD#TRPBF in the 28-lead (4mm × 5mm) QFN package has a thermal resistance θJA of 43°C/W and requires the exposed pad (Pin 29) to be soldered directly to a PCB ground plane with multiple thermal vias. Failure to do so compromises both electrical grounding and heat dissipation, risking thermal shutdown under sustained 2A loads. Layout guidelines mandate local VIN/GND bypassing near Pins 27/10 and minimizing trace inductance on SW/DA paths to maintain stability - all validated in LT3514EUFD#TRPBF evaluation board designs.
LT3514EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 3.2V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 2A, 1A
- Frequency - Switching:
- 270kHz ~ 2.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3514EUFD#TRPBF FAQ
1.How can I place an order for LT3514EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3514EUFD#TRPBF 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 LT3514EUFD#TRPBF reliable?
The price and inventory of LT3514EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3514EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3514EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3514EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3514EUFD#TRPBF?
LT3514EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3514EUFD#TRPBF 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 LT3514EUFD#TRPBF?
For technical support, including LT3514EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3514EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3514EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3514EUFD#TRPBF 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 LT3514EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3514EUFD#TRPBF?
All LT3514EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3514EUFD#TRPBF, 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 LT3514EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3514EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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