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Analog Devices Inc. LT3514IFE#TRPBF
- Part No.:
- LT3514IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3514IFE#TRPBF.pdf
- Description:
- IC REG BCK ADJ 2A/TRPL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,208
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Product details
Overview
LT3514IFE#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. It integrates three independent buck channels (CH1: 1A, CH3: 2A, CH4: 1A), internal compensation, programmable frequency (350kHz–2.2MHz), and power-good monitoring - used in automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3514IFE#TRPBF datasheet, LT3514IFE#TRPBF pinout, LT3514IFE#TRPBF application, or LT3514IFE#TRPBF equivalent, key selection criteria include channel current asymmetry (2A on CH3), TSSOP-24 package thermal performance (θJA = 33°C/W), EN/UVLO threshold (1.44V rising), FB reference (800mV), and SKY pin drive voltage (VIN + 4.85V).
Technical Context
The LT3514IFE#TRPBF implements three independent bipolar NPN buck regulators driven by an on-chip boost stage (SW5/SKY) that generates a regulated gate-drive voltage 4.85V above VIN. Each channel features cycle-by-cycle peak current limiting (CH1/CH4: 1.75A typ, CH3: 3.5A typ), catch diode current limiting, and soft-start via dedicated RUN/SS pins.
It supports anti-phase switching between CH3/CH4 and CH1 to reduce input ripple, uses resistor-programmed constant-frequency PWM (RT/SYNC pin), and includes independent undervoltage lockout (EN/UVLO), output voltage tracking, sequencing, and open-collector PG assertion when all FB pins exceed 710mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 36V (40V transient); enables direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Output Current Capability | CH1: 1A, CH3: 2A, CH4: 1A - asymmetric configuration optimized for mixed-voltage system supplies (e.g., 1.8V/3.3V/5V). |
| Feedback Reference Voltage | 800mV ±10mV over temperature; allows precise output programming with standard resistor dividers (e.g., R2 = 10.2kΩ). |
| Switching Frequency Range | 350kHz to 2.2MHz (via RT resistor or external SYNC); supports compact magnetics and EMI-sensitive designs. |
| Thermal Performance | θJA = 33°C/W (TSSOP-24, exposed pad soldered); requires PCB thermal vias for sustained 2A operation at high ambient. |
| Power Good Threshold | PG asserts when all FB ≥ 710mV (65mV offset above 800mV ref); provides reliable system-level power sequencing confirmation. |
| EN/UVLO Threshold | Rising: 1.44V ±0.24V; enables accurate input rail qualification before startup (e.g., disable below 12V battery sag). |
Pinout & Package
LT3514IFE#TRPBF is housed in a 24-lead plastic TSSOP package with exposed thermal pad (Pin 25 = GND). The package measures 7.8mm × 4.4mm × 1.1mm and requires soldering of the exposed pad to a PCB ground plane with thermal vias for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 11, 12) | Main input power supply | Supplies current to internal regulators and power switches; must be locally bypassed and tied together. |
| GND (Pins 22, Exposed Pad 25) | Ground reference and thermal path | Exposed pad is electrically GND and mandatory for thermal management; connect to large copper area with ≥6 thermal vias. |
| EN/UVLO (Pin 16) | Enable and input undervoltage detection | Pull <1.44V to shut down; rising threshold enables startup and serves as precision UVLO (2.9V internal lockout). |
| RUN/SS1, SS3, SS4 (Pins 13, 14, 15) | Per-channel soft-start and tracking control | Internal 1.3µA current source ramps voltage; tie capacitor to GND for soft-start, resistor divider for output tracking. |
| FB1, FB3, FB4 (Pins 18, 19, 20) | Output voltage feedback inputs | Each regulated to 800mV; sets output via R1/R2 divider; R2 = 10.2kΩ recommended for accuracy. |
| PG (Pin 21) | Open-collector power-good indicator | Low until all outputs reach regulation (FB ≥ 710mV); pulled high externally (e.g., 10kΩ to 3.3V) when active. |
| SW1, SW3, SW4 (Pins 4, 5, 6, 8) | Buck switch node outputs | Connect to inductor and Schottky cathode; CH3 (SW3) handles 2A continuous, requiring low-ESR layout. |
| DA1, DA3, DA4 (Pins 3, 7, 9) | Catch diode anode return | Internal comparator monitors diode current to prevent inductor runaway during transients. |
| SKY (Pin 24) | Boost-derived gate-drive voltage output | Regulated at VIN + 4.85V; powers internal switch drivers; requires 1µF ceramic cap to VIN. |
| SW5 (Pin 23) | Boost regulator switch output | Drives external inductor to charge SKY capacitor; max 320mA switch current. |
| RT/SYNC (Pin 17) | Oscillator programming/synchronization | Tie resistor to GND for frequency setting (e.g., 18.2kΩ = 1MHz); accepts 350kHz–2.2MHz external clock. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck regulation | Enables single-chip generation of three different system voltages (e.g., 1.8V core, 3.3V I/O, 5V peripheral) without external controllers. |
| 100% duty cycle operation | On-chip boost regulator (SW5/SKY) sustains regulation even when VIN ≈ VOUT, critical for automotive cold-crank (4.5V–5V) scenarios. |
| Anti-phase switching | CH3/CH4 operate 180° out-of-phase with CH1, reducing RMS input capacitor ripple current by up to 40% versus in-phase operation. |
| Independent RUN/SS pins | Allows per-rail sequencing (e.g., delay 3.3V after 1.8V) and tracking (e.g., 5V follows 3.3V ramp) using simple RC or resistor networks. |
| Short-circuit robustness | Cycle-by-cycle current limit + catch diode current limit + thermal shutdown protect against sustained overload, reverse polarity, or diode failure. |
Applications
| Automotive Battery Regulation | Industrial Control Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 1.8V, 3.3V, and 5V for ADAS camera module with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary triple-output DC/DC controller managing core logic, interface, and sensor bias rails under 4.5V–40V transients. Use Value: 100% duty cycle ensures uninterrupted 3.3V supply during engine cranking; PG signal coordinates MCU reset sequencing. | Use Scenario: Powering PLC I/O modules with isolated 3.3V logic, 5V analog front-end, and 1.8V FPGA core from 24V factory bus. IC Role / Device Role / Timing Role: Centralized multi-rail power manager replacing discrete buck ICs, reducing BOM count and board space. Use Value: Independent RUN/SS pins enable safe power-up order (FPGA core before I/O); thermal shutdown prevents field failures in enclosed enclosures. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Converting 9–24V AC/DC adapter output to stable 1.8V/3.3V/5V for smart home gateway with USB and Ethernet PHYs. IC Role / Device Role / Timing Role: High-efficiency triple buck converter minimizing heat in compact plastic enclosure. Use Value: 2.2MHz max switching frequency allows use of 2.2µH inductors; >90% efficiency at 500mA load reduces thermal derating. | Use Scenario: Providing local 3.3V and 5V rails near motor driver ICs in robotics control board, minimizing IR drop across long traces. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response and low-noise operation for noise-sensitive analog circuits. Use Value: Internal compensation eliminates loop stability tuning; 800mV FB reference improves light-load accuracy vs. 1.25V competitors. |
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#PBF | Eight 1A channels configurable as 1–4 outputs; 2.25V–5.5V input; no boost stage; requires external VBIAS. | Lower input range; better for low-voltage systems (e.g., 3.3V/5V bus); lacks 100% DC capability for automotive. | Select when needing flexible channel count and lower input voltage; avoid for 12V+ automotive or cold-crank. |
| TPS544B20RJTR | Single 4A buck with PMBus; 4.5V–18V input; no integrated boost; requires external compensation. | Higher per-channel current but only one output; digital interface adds complexity; no native multi-rail sequencing. | Select for digitally controlled single-rail high-current apps; not a functional substitute for triple-output requirement. |
Compared with LTC3375EFE#PBF and TPS544B20RJTR, the LT3514IFE#TRPBF uniquely delivers asymmetric triple outputs (2A/1A/1A) with integrated boost for 100% duty cycle - making it irreplaceable in cost-sensitive, space-constrained 12V/24V systems requiring cold-crank immunity and analog sequencing.
Availability
LT3514IFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer regulation requiring stable component supply, extended temperature support (–40°C to 125°C), and lead-free compliance.
Supply support for LT3514IFE#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 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification.
The LT3514IFE#TRPBF belongs to Linear's monolithic multi-output buck regulator family, designed specifically for space-constrained systems needing robust, integrated solutions for 12V/24V battery-powered equipment with stringent cold-crank and transient requirements.
FAQ
What is the maximum input voltage rating for the LT3514IFE#TRPBF?
The LT3514IFE#TRPBF has an absolute maximum VIN rating of 40V, with guaranteed operation from 3.2V to 36V. Transient spikes up to 40V are tolerated, but continuous operation above 36V risks exceeding the 125°C junction temperature limit due to instantaneous power dissipation during startup. Always verify thermal design margins when operating near 36V.
Does the LT3514IFE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LT3514IFE#TRPBF supports true 100% duty cycle operation via its integrated boost regulator (Channel 5). The SW5 switch and SKY pin generate a gate-drive voltage precisely 4.85V above VIN, enabling full saturation of the internal bipolar power switches even when VIN equals or slightly exceeds the output voltage - essential for automotive cold-crank survival.
How does the LT3514IFE#TRPBF handle output voltage sequencing and tracking?
The LT3514IFE#TRPBF implements sequencing and tracking through its three independent RUN/SS pins (Pins 13, 14, 15). To track, connect a resistor divider from a master output to a RUN/SS pin; to sequence, add series RC networks with different time constants. An internal 1.3µA current source ramps each pin, and the error amplifier follows the ramp until it reaches 0.9V, then locks to 800mV.
What is the purpose of the DA pins on the LT3514IFE#TRPBF, and how should they be connected?
The DA pins (Pins 3, 7, 9) on the LT3514IFE#TRPBF return the Schottky catch diode anode to internal current-sense circuitry. They must be connected directly to the anode of the corresponding external Schottky diode. This enables catch diode current limiting - a critical protection feature that prevents inductor current runaway during output short-circuit or rapid load transients.
Can the LT3514IFE#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LT3514IFE#TRPBF can be synchronized via its RT/SYNC pin (Pin 17) to an external clock signal ranging from 350kHz to 2.2MHz. The signal must have a minimum pulse width of 50ns and logic-compatible amplitude (0V to ≥1.5V). When synchronizing, ensure the external source drives the pin directly or through a 1nF AC-coupling capacitor if the source is low-impedance in inactive state.
LT3514IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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:
- 24-TSSOP
LT3514IFE#TRPBF FAQ
1.How can I place an order for LT3514IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3514IFE#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 LT3514IFE#TRPBF reliable?
The price and inventory of LT3514IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3514IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3514IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3514IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3514IFE#TRPBF?
LT3514IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3514IFE#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 LT3514IFE#TRPBF?
For technical support, including LT3514IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3514IFE#TRPBF requirements.
6.How does Aetrix verify that LT3514IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3514IFE#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 LT3514IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3514IFE#TRPBF?
All LT3514IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3514IFE#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 LT3514IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3514IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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