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Analog Devices Inc. LT3507AHFE#TRPBF
- Part No.:
- LT3507AHFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3507AHFE#TRPBF.pdf
- Description:
- IC REG QUAD BUCK/LINEAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,024
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Product details
Overview
LT3507AHFE#TRPBF from Analog Devices (formerly Linear Technology) is a triple monolithic step-down DC/DC converter with integrated 2.7A and dual 1.8A bipolar NPN power switches, plus an external-transistor LDO regulator. It operates from 4V to 36V input, delivers synchronized antiphase switching at 250kHz–2.5MHz, and supports independent shutdown, soft-start, and power-good signaling for DSP and microcontroller power sequencing in industrial embedded systems.
For engineers reviewing the LT3507AHFE#TRPBF datasheet, LT3507AHFE#TRPBF pinout, LT3507AHFE#TRPBF application, or LT3507AHFE#TRPBF equivalent, this page provides verified technical context, package mapping to 38-lead TSSOP, confirmed thermal rating (–40°C to 150°C), real-world ripple reduction via antiphase operation, and validated alternative options for multi-rail power supply design.
Technical Context
The LT3507AHFE#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 reduce input ripple current. Each channel uses internal bipolar NPN switches, BOOST-capacitor-assisted gate drive, and VC-pinned error amplifiers with 330µS transconductance and 500V/V gain.
It integrates programmable over/undervoltage lockout (1.20V threshold ±50mV), frequency foldback during overload (120kHz foldback frequency), and thermal shutdown. The LDO section employs an external NPN pass transistor driven by the DRIVE pin, regulated via FB4 to 800mV with 1100V/V error amplifier gain and 0.5–0.8V dropout from BIAS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide industrial input rails including 12V, 24V, and 28V systems without pre-regulation. |
| Output Current Capability | 2.7A (Channel 1), 1.8A ×2 (Channels 2 & 3) - enables single-chip triple-rail supply for FPGA core/I/O/memory or DSP + peripheral rails. |
| Switching Frequency Range | 250kHz to 2.5MHz - set by RT resistor; allows optimization between efficiency (lower fSW) and component size (higher fSW). |
| Junction Temperature Range | –40°C to 150°C - rated for harsh environments including automotive under-hood and industrial motor control cabinets. |
| Feedback Reference Voltage | 800mV ±12mV - tight tolerance enables accurate output regulation across temperature and load for precision analog supplies. |
| Power Good Threshold Accuracy | ±80mV offset from regulation point - ensures reliable sequencing with microcontrollers and FPGAs requiring precise rail validation. |
| Shutdown Current | 1µA - enables ultra-low-power standby in battery-backed or energy-sensitive applications. |
Pinout & Package
LT3507AHFE#TRPBF is housed in a thermally enhanced 38-lead plastic TSSOP package (FE) with exposed GND pad (Pin 39) requiring PCB soldering for thermal and electrical integrity. θJA = 24°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Main input for 2.7A regulator and internal bias circuitry | Must exceed 3.8V UVLO threshold; powers startup logic and Channel 1 switch; requires local bypassing. |
| SW1, SW2, SW3 | Switch node outputs for internal NPN power transistors | Connect to inductors and Schottky diodes; SW1 operates antiphase to SW2/SW3 to minimize input ripple. |
| FB1–FB3 | Negative inputs of error amplifiers for buck channels | Regulated to 800mV; used with resistor dividers to set VOUT; bias current ≤ –500nA minimizes divider error. |
| PGOOD1–PGOOD3 | Open-collector status outputs | Pull high externally; assert when respective FB pin reaches 90% of target - enables safe power sequencing. |
| RT/SYNC | Oscillator timing and synchronization input | Accepts resistor-to-GND (203kΩ–9.17kΩ) for 250kHz–2.5MHz fSW, or external clock signal (1.8V–5V logic). |
| RUN1–RUN3 | Individual enable inputs per buck channel | High >1.25V enables corresponding regulator; all low disables entire IC and reduces IQ to 1µA. |
| TRK/SS1–TRK/SS3 | Tracking/soft-start control pins | Source 1.25µA; below 0.8V overrides FB reference to enable ratiometric start-up or soft-start via capacitor. |
| VC1–VC3 | Error amplifier outputs | Control peak switch current; clamp-limited to 1.8V; pulling to GND disables channel. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching architecture | SW1 180° out-of-phase with SW2/SW3 reduces RMS input ripple current by up to 40%, easing input capacitor selection. |
| Independent per-channel RUN and PGOOD | Enables flexible power sequencing - e.g., delay VOUT2 until VOUT1 stabilizes - without external logic or timers. |
| User-programmable OVLO/UVLO | Resistor-divider-based detection on VINSW with 10µA hysteresis current yields precise, adjustable input fault thresholds. |
| Thermally robust packaging | 38-lead TSSOP with exposed GND pad achieves θJA = 24°C/W - critical for sustained 2.7A operation at 150°C junction. |
| Integrated frequency foldback | Automatically reduces switching frequency to 120kHz during overload or short-circuit, limiting peak switch current and thermal stress. |
Applications
| Industrial Motor Drive Control | DSP-Based Signal Processing System |
|---|---|
|
Use Scenario: Powering isolated gate drivers, position sensors, and MCU cores in servo drives operating from 24V bus. IC Role / Device Role / Timing Role: Triple-output buck regulator delivering 5V (gate drive), 3.3V (MCU), and 1.8V (FPGA I/O) with coordinated sequencing. Use Value: Antiphase switching cuts input ripple, reducing EMI filter size; PGOOD signals ensure safe enable order before PWM activation. |
Use Scenario: Supplying TI C6000 or Analog Devices SHARC DSPs with core, I/O, memory, and auxiliary LDO rails. IC Role / Device Role / Timing Role: Primary power management IC generating 1.2V (core), 3.3V (I/O), and 2.5V (memory) with TRK/SS-controlled ramp alignment. Use Value: Independent soft-start prevents inrush current conflicts; 150°C rating supports convection-cooled enclosures near heat sources. |
| Automotive ADAS Camera Module | Programmable Logic Controller (PLC) Backplane |
|
Use Scenario: Powering image sensor, ISP processor, and SerDes interface in 12V-powered rear-view camera modules. IC Role / Device Role / Timing Role: Single-chip solution providing 1.8V (sensor), 2.8V (ISP), and 3.3V (SerDes) with UVLO/ OVLO protection against load-dump transients. Use Value: 4V–36V input range tolerates cold-crank (6.5V) and load-dump (36V); 150°C rating accommodates sealed housing temperatures. |
Use Scenario: Generating multiple isolated rails (5V logic, 24V I/O, 3.3V communication) in DIN-rail mounted PLCs with 24V DC input. IC Role / Device Role / Timing Role: Central power controller managing buck outputs and external LDO (via DRIVE pin) for analog sensor front-ends. Use Value: External NPN LDO allows high-current, low-noise 2.5V analog supply; RUN pin control enables dynamic rail shutdown during sleep mode. |
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 |
|---|---|---|---|
| LT3507AEFE#TRPBF | Same pinout and functionality, but rated for –40°C to 125°C junction temperature (vs. 150°C for LT3507AHFE#TRPBF). | Suitable for commercial/industrial ambient environments where extended high-temp operation is not required. | Select when thermal margin is sufficient at 125°C and cost optimization is prioritized over extended temperature capability. |
| LT3507AIUHF#TRPBF | QFN-38 package (5mm × 7mm), same –40°C to 125°C rating, lower θJA = 34°C/W vs. TSSOP's 24°C/W. | Better thermal performance in space-constrained layouts; requires different PCB footprint and reflow profile. | Choose for compact designs needing superior thermal dissipation, accepting QFN assembly complexity and higher cost. |
Compared with LT3507AHFE#TRPBF, LT3507AEFE#TRPBF trades 25°C junction headroom for lower cost in benign environments, while LT3507AIUHF#TRPBF offers better thermal resistance in QFN form but demands layout revision and requalification - making LT3507AHFE#TRPBF optimal for high-reliability, high-temperature industrial deployments requiring drop-in TSSOP compatibility.
Availability
LT3507AHFE#TRPBF is available at Aetrix Electronics and suitable for industrial motor control, automotive ADAS modules, DSP-based instrumentation, and programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3507AHFE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3507A product line was designed specifically for compact, high-efficiency multi-rail power conversion in space- and thermal-constrained embedded systems - emphasizing antiphase ripple cancellation, robust fault protection, and seamless integration with microcontrollers and DSPs.
FAQ
What is the maximum junction temperature rating for LT3507AHFE#TRPBF?
The LT3507AHFE#TRPBF is specified for operation from –40°C to 150°C junction temperature, verified per manufacturer characterization and statistical process control. This exceeds the –40°C to 125°C rating of LT3507AE/ AI variants and enables deployment in high-ambient environments such as industrial motor drives and automotive under-hood applications where sustained 150°C operation is required.
How does antiphase switching reduce input ripple in LT3507AHFE#TRPBF?
In LT3507AHFE#TRPBF, SW1 operates 180° out-of-phase with SW2 and SW3, causing their input current waveforms to partially cancel at the VIN1 node. This reduces RMS input ripple current by up to 40% compared to in-phase operation, allowing smaller bulk capacitors and lower EMI filtering requirements - a key advantage in dense industrial and automotive PCB layouts.
Can LT3507AHFE#TRPBF support power sequencing for FPGA or ASIC supplies?
Yes. LT3507AHFE#TRPBF provides independent RUN pins and open-collector PGOOD outputs for each of its three buck channels. By cascading PGOODx to RUNy via RC delays or logic, designers can enforce strict voltage ramp ordering - for example, enabling 1.0V core only after 2.5V I/O and 3.3V auxiliary rails reach regulation - ensuring safe FPGA/ASIC boot without external sequencers.
What is the role of the DRIVE pin in LT3507AHFE#TRPBF?
The DRIVE pin in LT3507AHFE#TRPBF sources up to 22.5mA to drive the base of an external NPN transistor, forming a low-dropout linear regulator (LDO) stage. This enables a fourth, low-noise output (e.g., 2.5V analog supply) with dropout as low as 0.5V from BIAS, decoupled from switching noise - critical for ADC references and sensor signal chains.
Does LT3507AHFE#TRPBF include built-in protection features?
Yes. LT3507AHFE#TRPBF integrates frequency foldback (reducing fSW to 120kHz during overload), thermal shutdown, overvoltage lockout (OVLO), undervoltage lockout (UVLO), and cycle-by-cycle current limiting. These protections activate without external components and are validated across the full –40°C to 150°C junction range, ensuring robust operation in unattended industrial equipment.
LT3507AHFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3507AHFE#TRPBF FAQ
1.How can I place an order for LT3507AHFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3507AHFE#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 LT3507AHFE#TRPBF reliable?
The price and inventory of LT3507AHFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3507AHFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3507AHFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3507AHFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3507AHFE#TRPBF?
LT3507AHFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3507AHFE#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 LT3507AHFE#TRPBF?
For technical support, including LT3507AHFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3507AHFE#TRPBF requirements.
6.How does Aetrix verify that LT3507AHFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3507AHFE#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 LT3507AHFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3507AHFE#TRPBF?
All LT3507AHFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3507AHFE#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 LT3507AHFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3507AHFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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