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Analog Devices Inc. LT3514EFE#PBF
- Part No.:
- LT3514EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3514EFE#PBF.pdf
- Description:
- IC REG BCK ADJ 2A/TRPL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:336
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Product details
Overview
LT3514EFE#PBF 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. It features independent soft-start pins, power-good monitoring, and resistor-programmable switching frequency up to 2.2MHz - used in automotive battery regulation and industrial distributed power supplies.
For engineers reviewing the LT3514EFE#PBF datasheet, LT3514EFE#PBF pinout, LT3514EFE#PBF application, or LT3514EFE#PBF equivalent, key selection criteria include channel current ratings (2A/1A/1A), SKY pin drive voltage (VIN + 4.85V), feedback reference (800mV), thermal shutdown behavior, and TSSOP-24 package compatibility with EN/UVLO, RUN/SS, and RT/SYNC control interfaces.
Technical Context
The LT3514EFE#PBF integrates three independent buck regulators (CH1: 1A, CH3: 2A, CH4: 1A) and one dedicated 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 limiting for overload protection.
It supports anti-phase switching between CH3 and CH4 to reduce input ripple, offers programmable frequency (350kHz–2.2MHz) via RT/SYNC pin, and implements output voltage tracking via RUN/SS pin resistor dividers. The device operates across –40°C to +125°C junction temperature with internal compensation and 800mV feedback reference.
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. |
| Output Current Ratings | CH1: 1A, CH3: 2A, CH4: 1A - defines maximum continuous load per channel without thermal derating. |
| Feedback Reference Voltage | 790–816mV (min/max over temp); sets output accuracy and resistor-divider design margin. |
| Switching Frequency Range | 350kHz to 2.2MHz (sync or resistor-programmed); allows EMI optimization and inductor size reduction. |
| SKY Pin Voltage Offset | VIN + 4.85V (typical); provides gate drive headroom for internal bipolar switches to achieve low VCE(SAT). |
| Power Good Threshold | FB rising threshold offset = 65–125mV; ensures all outputs are within ±8% regulation before asserting PG high. |
| Thermal Shutdown | Activates above ~175°C junction; protects power switches during sustained overload or poor PCB thermal design. |
Pinout & Package
LT3514EFE#PBF is housed in a 24-lead plastic TSSOP package with exposed thermal pad (Pin 25 = GND). The package has θJA = 33°C/W and requires soldering of the exposed pad to PCB ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,11,12) | Main input supply rail | Supplies current to internal regulators and power switches; must be locally bypassed and tied together. |
| GND (Pins 22,25) | Ground reference and thermal path | Exposed pad (Pin 25) must be soldered to PCB ground plane with thermal vias for heat dissipation. |
| SW1/SW3/SW4 (Pins 4,5,6,8) | Switch node outputs | Connect to inductor and Schottky diode cathodes; each drives one buck channel's power stage. |
| DA1/DA3/DA4 (Pins 3,7,9) | Catch diode anode sense | Monitors diode current to prevent inductor current runaway during transients. |
| FB1/FB3/FB4 (Pins 18,19,20) | Output voltage feedback | Each regulated to 800mV; sets output voltage via external resistor divider (R1/R2). |
| RUN/SS1/RUN/SS3/RUN/SS4 (Pins 13,14,15) | Channel enable & soft-start | Internal 1.3µA current source ramps voltage; pull below 0.1V to shut down individual channel. |
| EN/UVLO (Pin 16) | Global enable & input UVLO | Rising threshold = 1.44V; also functions as accurate undervoltage lockout (2.4–3.2V range). |
| RT/SYNC (Pin 17) | Oscillator control | Resistor-to-ground sets frequency; external clock (350kHz–2.2MHz) can synchronize multiple devices. |
| PG (Pin 21) | Power good indicator | Open-collector output; goes high only when all FB pins exceed 710mV (i.e., all outputs in regulation). |
| SW5 (Pin 23) | Boost regulator switch | Drives external inductor to generate SKY voltage; internal 0.4A switch with cycle-by-cycle current limit. |
| SKY (Pin 24) | Boost output & gate drive rail | Provides VIN + 4.85V to power internal switch drivers; requires 1µF capacitor to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Triple buck architecture with 2A/1A/1A outputs | Enables single-chip power solution for multi-rail systems (e.g., 1.8V/3.3V/5V) without external controllers. |
| Integrated boost regulator (CH5) | Generates SKY voltage at VIN + 4.85V to ensure full saturation of internal bipolar switches across full input range. |
| Independent RUN/SS pins per channel | Allows precise sequencing and tracking of output voltages using resistor dividers - critical for FPGA/CPU core logic timing. |
| Anti-phase switching between CH3 and CH4 | Reduces input ripple current by ~30%, lowering required input capacitance and EMI filter size. |
| Programmable frequency with wide sync range | Supports noise-sensitive applications (e.g., RF modules) by avoiding critical frequency bands via external clock synchronization. |
| Short-circuit robust design | Combines cycle-by-cycle current limit, catch diode current limit, and thermal shutdown to survive sustained output shorts. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to stable 1.8V, 3.3V, and 5V rails for infotainment, ADAS sensors, and CAN transceivers. IC Role / Device Role / Timing Role: Primary triple-output DC/DC converter providing isolated, sequenced, and tracked power domains with fault protection. Use Value: Eliminates need for discrete boost + buck stages; 36V max input withstands load-dump transients; PG pin validates system readiness before MCU boot. | Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interfaces requiring clean, independently controlled 3.3V, 5V, and 12V analog/digital supplies. IC Role / Device Role / Timing Role: Centralized power management IC delivering regulated outputs with adjustable startup sequencing and undervoltage lockout. Use Value: Independent RUN/SS pins enable custom power-up order (e.g., analog first, then digital); 100% duty cycle supports low-dropout operation during brownouts. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Converting unregulated 9–24V AC/DC adapter output into tightly regulated 1.8V, 3.3V, and 5V for embedded gateways and IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency triple buck regulator minimizing heat buildup in compact enclosures with no heatsink. Use Value: 2.2MHz max switching frequency allows use of small 2.2µH inductors; internal compensation reduces BOM count by 4–6 components per channel. | Use Scenario: Providing local point-of-load regulation in telecom base stations or server backplanes where multiple voltage domains feed FPGAs, ASICs, and memory. IC Role / Device Role / Timing Role: Distributed power controller supporting voltage tracking, remote enable/disable, and power-good coordination across subsystems. Use Value: PG pin enables system-level power sequencing; RT/SYNC pin allows synchronization with master clock to suppress beat frequencies in dense board layouts. |
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 |
|---|---|---|---|
| LTC3631EFE#PBF | Single 3A buck with external compensation; no integrated boost or multi-channel support. | Requires external circuitry for triple-rail generation; lacks PG, tracking, and 100% duty cycle. | Select when only one high-current rail is needed and board space permits discrete implementation. |
| LT3504EFE#PBF | Four 1A channels; same TSSOP-24 package and pinout except CH2 omitted and CH3 upgraded to 2A. | Direct footprint-compatible but different channel mapping; CH2 missing, CH3 rated higher. | Choose when four lower-current rails are preferred over three asymmetric ones; verify layout compatibility. |
Compared with LTC3631EFE#PBF, LT3514EFE#PBF delivers integrated triple regulation and 100% duty cycle without external boost components; versus LT3504EFE#PBF, it trades one 1A channel for higher 2A capacity on CH3 - ideal for systems needing stronger 3.3V or 5V delivery with simplified BOM.
Availability
LT3514EFE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3514EFE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LT3514 belongs to Linear's monolithic triple buck regulator product line, designed specifically for space-constrained, multi-rail applications in automotive, industrial, and communications equipment where input voltage varies widely and reliability under fault conditions is critical.
FAQ
What is the maximum input voltage rating for LT3514EFE#PBF?
The absolute maximum input voltage rating for LT3514EFE#PBF is 40V, with continuous operation specified from 3.2V to 36V. Transient input spikes up to 40V are tolerated, but startup above 36V is discouraged due to instantaneous power dissipation risks. The device uses internal undervoltage lockout (UVLO) with a typical rising threshold of 2.9V to prevent operation below safe input levels.
How does the SKY pin function in LT3514EFE#PBF?
The SKY pin in LT3514EFE#PBF is the output of the integrated boost regulator (CH5), delivering a voltage precisely 4.85V above VIN to drive internal bipolar power switches. It requires a 1µF capacitor to VIN and must not be loaded externally. This rail ensures full transistor saturation across the full 3.2V–36V input range, enabling true 100% duty cycle operation - a key feature distinguishing LT3514EFE#PBF from standard buck controllers.
Can LT3514EFE#PBF replace LT3504EFE#PBF on the same PCB?
LT3514EFE#PBF shares the same 24-lead TSSOP package and pinout as LT3504EFE#PBF, making it a drop-in replacement in most cases. However, CH2 is omitted and CH3 is upgraded to 2A (vs. 1A in LT3504), so routing and thermal design must accommodate higher current on CH3. No PCB changes are required if the original design did not use CH2 and CH3 load remains ≤2A.
What is the purpose of the DA pins on LT3514EFE#PBF?
The DA pins (DA1, DA3, DA4) on LT3514EFE#PBF return the Schottky catch diode anode to internal current-sense comparators. They monitor diode conduction to prevent inductor current runaway during fast transients or short-circuit events - a critical protection mechanism beyond standard cycle-by-cycle switch current limiting. Each DA pin must connect directly to its corresponding diode anode with minimal trace length.
Does LT3514EFE#PBF support output voltage tracking and sequencing?
Yes, LT3514EFE#PBF supports precise output voltage tracking and sequencing via its independent RUN/SS pins (RUN/SS1, RUN/SS3, RUN/SS4). By connecting resistor dividers from target output rails to these pins, designers can force one channel to follow another during startup/shutdown. This eliminates need for external tracking ICs and ensures safe power-up order for mixed-voltage SoCs and FPGAs.
LT3514EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- 24-TSSOP
LT3514EFE#PBF FAQ
1.How can I place an order for LT3514EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3514EFE#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 LT3514EFE#PBF reliable?
The price and inventory of LT3514EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3514EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3514EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3514EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3514EFE#PBF?
LT3514EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3514EFE#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 LT3514EFE#PBF?
For technical support, including LT3514EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3514EFE#PBF requirements.
6.How does Aetrix verify that LT3514EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3514EFE#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 LT3514EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3514EFE#PBF?
All LT3514EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3514EFE#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 LT3514EFE#PBF part is unused and in its original packaging.
Return procedure for LT3514EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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