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Analog Devices Inc. LT3507AIUHF#TRPBF
- Part No.:
- LT3507AIUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3507AIUHF#TRPBF.pdf
- Description:
- IC REG QD BUCK/LINEAR 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
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Product details
Overview
LT3507AIUHF#TRPBF from Analog Devices (formerly Linear Technology) is a triple monolithic step-down DC/DC converter with integrated 2.7A and dual 1.8A switching regulators plus an external-transistor LDO controller. It operates from 4V to 36V input, delivers synchronized antiphase switching for reduced input ripple, and supports independent shutdown, soft-start, and power-good signaling - enabling precise sequencing in multi-rail DSP and industrial power systems.
For engineers reviewing the LT3507AIUHF#TRPBF datasheet, LT3507AIUHF#TRPBF pinout, LT3507AIUHF#TRPBF application, or LT3507AIUHF#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world sequencing use cases - all aligned to the UHF (38-lead 5mm × 7mm QFN) package with exposed GND pad.
Technical Context
The LT3507AIUHF#TRPBF implements three independent current-mode step-down regulators sharing a master oscillator, with SW1 operating 180° out-of-phase relative to SW2/SW3 to minimize input capacitor RMS current. Each channel features dedicated VC error amplifier output, TRK/SS pin for tracking or soft-start, and PGOOD open-collector indicator referenced to 90% of regulation threshold.
It integrates programmable overvoltage/undervoltage lockout (OVLO/UVLO) with 1.20V trip and ±10µA hysteresis current, frequency foldback triggered at VFB < 0.4V, and thermal shutdown protection. The LDO controller uses DRIVE pin to drive external NPN pass transistor, regulated via FB4 to 800mV with line/load regulation of 0.05%/V and 0.005%/mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide industrial and automotive supply rails without pre-regulation. |
| Output Current Capability | 2.7A (Channel 1), 1.8A (Channels 2 & 3) - enables high-current core logic and I/O rail generation from single IC. |
| Switching Frequency Range | 250kHz to 2.5MHz (resistor-programmable) - allows optimization between efficiency and component size (e.g., 450kHz typical in reference designs). |
| Feedback Reference Voltage | 788–812mV (over full temperature range) - ensures tight output voltage accuracy across –40°C to 125°C junction temp. |
| Thermal Performance | θJA = 34°C/W (QFN UHF package) - requires exposed GND pad soldering for reliable operation at full load. |
| Shutdown Current | 1µA - enables ultra-low-power system standby when all RUN pins are low. |
| PGOOD Threshold Accuracy | ±27mV (58–105mV offset from regulation) - provides robust sequencing margin for microcontroller/DSP power-up coordination. |
Pinout & Package
LT3507AIUHF#TRPBF is housed in a thermally enhanced 38-lead plastic QFN package (5mm × 7mm), with exposed GND pad (Pin 39) requiring PCB soldering for electrical and thermal integrity. Pin count and layout match the UHF variant per Linear Technology's official package drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 39) | Power and Thermal Ground | Exposed pad must be soldered to large PCB ground plane to maintain θJA = 34°C/W and prevent thermal shutdown. |
| VIN1 (Pins 1,2) | Main Input Supply for Channel 1 & Internal Bias | Must exceed 3.8V (typical UVLO) to enable any regulator; powers internal reference and start-up circuitry. |
| SW1 (Pins 28,29) | Channel 1 Switch Node | Connects to inductor and Schottky diode; phase-inverted vs SW2/SW3 to reduce input ripple current. |
| FB1 (Pin 25) | Channel 1 Feedback Input | Regulated to 800mV ±12mV; resistor divider sets VOUT1 (e.g., 1.8V @ 2.7A in typical app). |
| PGOOD1 (Pin 24) | Channel 1 Power-Good Indicator | Open-collector output asserts high when FB1 reaches 90% of target - used for MCU reset or downstream enable sequencing. |
| RUN1 (Pin 16) | Channel 1 Enable Control | Drives >1.25V to activate Channel 1; independent control allows staggered startup or dynamic rail disabling. |
| RT/SYNC (Pin 12) | Frequency Set or Clock Sync Input | Resistor-to-ground sets fSW (250kHz–2.5MHz); accepts 1.8–5V CMOS/TTL sync signal with ≥100ns pulse width. |
| DRIVE (Pin 20) | LDO Pass Transistor Base Driver | Sources up to 22.5mA to drive external NPN; dropout from BIAS to DRIVE is 0.5–0.8V at 10mA load. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching architecture | SW1 180° out-of-phase with SW2/SW3 reduces input capacitor RMS current by ~30% vs in-phase operation. |
| Independent soft-start & tracking | TRK/SS1–TRK/SS4 pins support coincident or ratiometric startup (e.g., 1.8V/3.3V/5V rails ramp together). |
| User-programmable OVLO/UVLO | Resistor dividers on OVLO/UVLO pins set custom input fault thresholds with 10µA hysteresis current for stable recovery. |
| Integrated frequency foldback | Automatically reduces switching frequency to 120kHz during overload/short-circuit to limit peak switch current. |
| Thermally optimized QFN package | 38-lead 5mm × 7mm UHF package with exposed GND pad achieves 34°C/W θJA - critical for sustained 2.7A output. |
Applications
| Industrial PLC Power | DSP Core + I/O Supply |
|---|---|
|
Use Scenario: Programmable logic controller with isolated 24V DC input powering FPGA core (1.2V), DDR memory (1.5V), and analog I/O (3.3V, 5V). IC Role / Device Role / Timing Role: LT3507AIUHF#TRPBF generates four regulated outputs (1.8V/3.3V/5V/2.5V) with independent sequencing and PGOOD signals for safe FPGA configuration. Use Value: Eliminates need for three discrete buck converters and separate LDO - reduces BOM count by 6+ components and PCB area by >40%. |
Use Scenario: High-performance digital signal processor board requiring tightly tracked 1.2V core, 1.8V I/O, and 3.3V peripheral rails. IC Role / Device Role / Timing Role: LT3507AIUHF#TRPBF channels operate in antiphase with shared oscillator; TRK/SS pins enforce coincident ramp-up of all rails during cold start. Use Value: Achieves <±2% cross-regulation and <100µs inter-rail timing skew - meets TI C6000 and ADI SHARC boot requirements. |
| Automotive Infotainment | Test Equipment Power |
|
Use Scenario: In-vehicle head unit with 9–16V battery input powering SoC (1.1V), GPU (1.0V), USB PHY (3.3V), and display bias (5V). IC Role / Device Role / Timing Role: LT3507AIUHF#TRPBF VIN1 monitors battery via UVLO; RUN pins disable non-critical rails during cranking to preserve core voltage. Use Value: Withstands 40V load-dump transients (within 36V abs max rating) and maintains regulation down to 4V cold-crank - no external TVS required. |
Use Scenario: Benchtop oscilloscope requiring low-noise, sequenced supplies for ADC front-end (2.5V), FPGA (1.2V), and interface (3.3V). IC Role / Device Role / Timing Role: LT3507AIUHF#TRPBF PGOOD outputs feed into FPGA configuration controller to gate clock enable only after all rails stabilize. Use Value: Reduces startup validation time by eliminating manual scope probing of each rail - PGOOD logic replaces 4-channel mixed-signal debugging. |
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 |
|---|---|---|---|
| LT3507EUHF#TRPBF | Same pinout and functionality, but rated for 0°C to 125°C junction (vs –40°C to 125°C for LT3507AIUHF#TRPBF). | Not suitable for extended-temperature industrial or automotive environments requiring guaranteed –40°C startup. | Select LT3507AIUHF#TRPBF when operation below 0°C is required; LT3507EUHF#TRPBF suffices for commercial-temperature lab equipment. |
| MP2451DT-LF-Z | Single 2A buck only; no triple-output capability, no LDO controller, no antiphase or PGOOD sequencing features. | Requires three separate ICs plus external LDO to replicate LT3507AIUHF#TRPBF functionality - increases layout complexity and cost. | Use only for simple single-rail applications; not a functional alternative for multi-rail sequencing or space-constrained designs. |
Compared with LT3507EUHF#TRPBF, the LT3507AIUHF#TRPBF guarantees full specification compliance at –40°C, making it essential for cold-environment deployment; versus MP2451DT-LF-Z, it delivers integrated triple-output control with sequencing logic - reducing design effort, footprint, and bill-of-materials count by over 60%.
Availability
LT3507AIUHF#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, DSP-based test equipment, automotive infotainment systems, and medical imaging devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3507AIUHF#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 full product support, datasheets, and application notes for the LT3507A family. Linear Technology pioneered high-performance power management ICs with emphasis on precision, efficiency, and integration.
The LT3507A product line was designed specifically for compact, high-density multi-rail power systems in industrial automation, communications infrastructure, and embedded computing - delivering triple synchronous buck conversion with integrated sequencing and thermal robustness in a single QFN package.
FAQ
What is the maximum junction temperature rating for LT3507AIUHF#TRPBF?
The LT3507AIUHF#TRPBF is specified for operation from –40°C to +125°C junction temperature and is guaranteed over this full range. Its thermal resistance (θJA) is 34°C/W in the 5mm × 7mm QFN package, requiring proper soldering of the exposed GND pad to a thermal pad on the PCB to maintain reliability at full 2.7A load. Exceeding 125°C continuously degrades lifetime.
Does LT3507AIUHF#TRPBF support synchronization to an external clock?
Yes, the LT3507AIUHF#TRPBF supports external clock synchronization via the RT/SYNC pin. It accepts 1.8V to 5V CMOS or TTL logic-level signals with minimum high/low pulse widths of 100ns each. When synchronized, all three switching regulators maintain fixed 180° phase relationship between SW1 and SW2/SW3 while locking to the external frequency.
How does the antiphase switching in LT3507AIUHF#TRPBF reduce input ripple?
In LT3507AIUHF#TRPBF, SW1 operates 180° out-of-phase with SW2 and SW3. This causes their input current pulses to partially cancel at the VIN1 node, reducing RMS input capacitor current by approximately 30% compared to in-phase operation. The result is lower heating in input capacitors and smaller required capacitance for equivalent ripple performance.
Can LT3507AIUHF#TRPBF generate four regulated outputs?
Yes - LT3507AIUHF#TRPBF integrates three synchronous buck regulators (1×2.7A, 2×1.8A) and one LDO controller. The LDO uses the DRIVE pin to bias an external NPN transistor, with FB4 regulating its output (e.g., 2.5V at 300mA) to 800mV reference. This enables four independent, sequenced outputs from a single IC with minimal external components.
What is the purpose of the VINSW pin on LT3507AIUHF#TRPBF?
The VINSW pin on LT3507AIUHF#TRPBF is a switched version of VIN1 that connects to VIN1 only when any RUN pin is high. It serves as the sensing node for the user-programmable UVLO and OVLO circuits - allowing input fault detection to remain active only during device operation, avoiding false trips during shutdown or cold start.
LT3507AIUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (3), Linear (LDO) (1)
- Number of Outputs:
- 4
- Frequency - Switching:
- 900kHz ~ 1.1MHz
- Voltage/Current - Output 1:
- -, 2.7A
- Voltage/Current - Output 2:
- -, 1.8A
- Voltage/Current - Output 3:
- -, 1.8A
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 4V ~ 36V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LT3507AIUHF#TRPBF FAQ
1.How can I place an order for LT3507AIUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3507AIUHF#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 LT3507AIUHF#TRPBF reliable?
The price and inventory of LT3507AIUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3507AIUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3507AIUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3507AIUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3507AIUHF#TRPBF?
LT3507AIUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3507AIUHF#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 LT3507AIUHF#TRPBF?
For technical support, including LT3507AIUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3507AIUHF#TRPBF requirements.
6.How does Aetrix verify that LT3507AIUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3507AIUHF#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 LT3507AIUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3507AIUHF#TRPBF?
All LT3507AIUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3507AIUHF#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 LT3507AIUHF#TRPBF part is unused and in its original packaging.
Return procedure for LT3507AIUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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