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Analog Devices Inc. LT3507HUHF#TRPBF
- Part No.:
- LT3507HUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3507HUHF#TRPBF.pdf
- Description:
- IC REG QD BUCK/LINEAR 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,856
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Product details
Overview
LT3507HUHF#TRPBF from Analog Devices (formerly Linear Technology) is a triple monolithic step-down DC/DC converter with integrated 2.4A and dual 1.5A switching regulators plus an external-transistor LDO, operating from 4V to 36V input. It delivers precise, sequenced 1.8V/2.4A, 3.3V/1.5A, and 5V/1.5A outputs with antiphase switching, independent RUN/PGOOD, and 250kHz–2.5MHz programmable frequency - used in DSP power supplies, automotive infotainment, and distributed telecom rails.
For engineers reviewing the LT3507HUHF#TRPBF datasheet, LT3507HUHF#TRPBF pinout, LT3507HUHF#TRPBF application, or LT3507HUHF#TRPBF equivalent, key selection criteria include thermal grade (–40°C to 150°C), 38-lead 5mm × 7mm QFN package with exposed pad, antiphase ripple reduction, independent soft-start/tracking, and user-programmable OVLO/UVLO lockouts.
Technical Context
The LT3507HUHF#TRPBF integrates three current-mode, constant-frequency buck regulators sharing a master oscillator - Channel 1 (2.4A) runs 180° out-of-phase with Channels 2 & 3 (1.5A each) to minimize input ripple. Each channel features independent VC error amplifier output, TRK/SS pin for tracking or soft-start, and open-collector PGOOD with ±80mV threshold accuracy.
It combines internal bipolar NPN switches with BOOST-pin charge-pump drive, BIAS-pin efficiency optimization, and a separate LDO controller (FB4/DRIVE) supporting external NPN pass transistor. Overvoltage/undervoltage lockout is set via resistor dividers on VINSW, with 10µA hysteresis currents and ±50mV trip tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports lead-acid batteries, unregulated wall adapters, and industrial 24V rails without pre-regulation. |
| Output Current Capability | Channel 1: 2.4A; Channels 2 & 3: 1.5A each - enables single-chip triple-rail supply for multi-core DSPs or FPGAs. |
| Switching Frequency Range | 250kHz to 2.5MHz (resistor- or clock-synchronized) - allows ceramic capacitor use and compact layout with 4.7µH/2.2µF typical LC values. |
| Thermal Rating | Junction temperature range: –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Feedback Reference Voltage | 0.800V ±12mV (–40°C to 150°C) - ensures tight output regulation across full temp range with minimal drift. |
| Power Good Accuracy | ±80mV threshold offset at FB pins - enables reliable sequencing with microcontrollers and avoids false power-up signals. |
| Shutdown Current | <1µA (all RUN pins low) - meets ultra-low-power standby requirements in always-on systems. |
Pinout & Package
LT3507HUHF#TRPBF uses a thermally enhanced 38-lead 5mm × 7mm plastic QFN package with exposed ground pad (Pin 39), requiring PCB soldering for thermal and electrical integrity. Pin pitch is 0.5mm; package height is 0.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST1, BOOST2, BOOST3 (Pins 1, 27, 32) | Charge-pump bootstrap supply | Provides >VIN gate drive to internal bipolar switches; requires external diode + capacitor for saturation. |
| VIN1 (Pins 2, 3), VIN2 (Pins 30, 31), VIN3 (Pins 35, 36) | Input power rails | VIN1 powers Channel 1 switch + internal bias; VIN2/VIN3 power Channels 2/3 - may be tied or isolated per rail design. |
| SW1 (Pins 37, 38), SW2 (Pins 28, 29), SW3 (Pins 33, 34) | Switch node outputs | Connect directly to inductor inputs; dual pins per channel reduce parasitic inductance and improve thermal spreading. |
| VC1, VC2, VC3 (Pins 7, 23, 19) | Error amplifier outputs | Control peak switch current; pulling VCx to GND disables corresponding regulator - enables analog shutdown. |
| TRK/SS1–4 (Pins 8, 21, 18, 26) | Tracking/soft-start control | Below 0.8V, forces FBx regulation to TRK/SS voltage - supports ratiometric startup or controlled ramp-up. |
| PGOOD1–3 (Pins 10, 11, 12) | Open-collector status indicators | Assert high (via external pull-up) when FBx reaches 90% of target - enables hardware-based power sequencing. |
| RUN1–3 (Pins 14, 15, 16) | Enable inputs | Logic-high >1.25V activates respective channel; all low disables entire IC with <1µA quiescent draw. |
| RT/SYNC (Pin 13) | Frequency programming | Resistor-to-GND sets fSW (250kHz–2.5MHz); external clock input synchronizes multiple LT3507s to eliminate beat frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching architecture | Channel 1 operates 180° out-of-phase with Channels 2 & 3 - reduces RMS input ripple current by up to 40% vs. in-phase operation. |
| Independent soft-start and tracking | Four TRK/SS pins (including TRK/SS4 for LDO) allow custom ramp timing and voltage-ratio coordination - eliminates sequencing ICs in multi-rail systems. |
| User-programmable OVLO/UVLO | Dual comparator inputs (OVLO/UVLO) with 1.20V ±50mV threshold and 10µA hysteresis - enables adaptive input protection without external circuitry. |
| Thermally robust QFN package | 38-lead 5mm × 7mm QFN with exposed thermal pad (θJA = 34°C/W) - sustains full 2.4A output at 150°C junction without derating. |
| Integrated LDO controller | DRIVE pin drives external NPN pass transistor; FB4 regulates to 0.8V - adds low-noise, low-dropout rail (e.g., 2.5V @ 200mA) without extra IC. |
Applications
| Automotive Infotainment | DSP/FPGA Core Power |
|---|---|
Use Scenario: Powering head-unit SoC with 1.8V core, 3.3V I/O, 5V USB PHY, and 2.5V analog subsystem. IC Role / Device Role / Timing Role: Primary triple-buck + LDO PMIC delivering tightly sequenced, low-noise rails with thermal resilience for under-dash mounting. Use Value: Eliminates four discrete regulators; antiphase switching cuts input capacitor count by 30%; 150°C rating avoids heatsinks. |
Use Scenario: Supplying Xilinx Zynq or TI C66x DSP with dynamic core voltage scaling and auxiliary I/O/memory rails. IC Role / Device Role / Timing Role: Single-chip solution providing independent RUN/PGOOD control per rail and TRK/SS-based voltage ramp coordination. Use Value: Independent soft-start prevents inrush-induced brownout; PGOOD signals enable safe FPGA configuration handshake. |
| DSL/Cable Modem Power | Industrial PLC I/O Module |
Use Scenario: Generating 3.3V, 5V, and 12V (via LDO boost) from 12V or 24V PoE-derived input in space-constrained CPE. IC Role / Device Role / Timing Role: High-density triple-output regulator with wide 4V–36V input range and small 5mm × 7mm footprint. Use Value: Replaces three separate buck ICs; BOOST-driven bipolar switches maintain >90% efficiency at 24V input; RT/SYNC enables noise-sensitive RF section synchronization. |
Use Scenario: Providing isolated 5V logic, 3.3V MCU, and 1.8V sensor interface rails in DIN-rail mounted controllers with ambient temps up to 70°C. IC Role / Device Role / Timing Role: Industrial-grade PMIC with –40°C to 150°C operation, UVLO/OVLO protection, and robust ESD-tolerant pins. Use Value: Guaranteed functionality over full extended temperature range; shutdown current <1µA supports battery-backed sleep modes. |
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 |
|---|---|---|---|
| LT3573EFE#TRPBF | Triple buck (1.5A/1.5A/1.5A), no LDO, 16-Lead TSSOP, max 125°C junction | Lacks LDO channel and antiphase capability; smaller package but lower thermal capacity | Choose for cost-sensitive, lower-current designs where LDO and 150°C operation are unnecessary. |
| MP2451DT-LF-Z | Single 2A buck, 8-Lead SOIC, 4.5V–28V input, no tracking/PGOOD, 125°C max | Requires three separate ICs for triple output; no sequencing support or thermal grade | Select only when board area permits discrete implementation and sequencing is handled externally. |
Compared with LT3507HUHF#TRPBF, LT3573EFE#TRPBF offers reduced integration and thermal margin but lower BOM count in simpler systems, while MP2451DT-LF-Z demands full redesign for triple-rail delivery and lacks critical features like antiphase ripple reduction and hardware sequencing.
Availability
LT3507HUHF#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and telecom equipment requiring stable component supply, extended temperature operation, and high-reliability power management.
Supply support for LT3507HUHF#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT3507HUHF#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for compact, thermally demanding multi-rail power systems in automotive, telecom, and industrial applications.
FAQ
What is the maximum junction temperature rating for LT3507HUHF#TRPBF?
The LT3507HUHF#TRPBF is rated for continuous operation from –40°C to 150°C junction temperature, making it suitable for under-hood automotive and high-ambient industrial environments. This H-grade qualification exceeds the 125°C limit of E/I-grade variants and is verified across all electrical parameters in the datasheet's "Operating Junction Temperature Range" table.
How does antiphase switching reduce input ripple in LT3507HUHF#TRPBF?
In LT3507HUHF#TRPBF, Channel 1 (2.4A) operates 180° out-of-phase with Channels 2 and 3 (1.5A each), causing their input current waveforms to partially cancel at the VIN1 node. This phase relationship reduces RMS input ripple current by up to 40%, allowing smaller input bulk capacitors and lowering EMI filter requirements compared to in-phase operation.
Can LT3507HUHF#TRPBF generate a 2.5V LDO output, and how is it implemented?
Yes - LT3507HUHF#TRPBF includes a dedicated LDO controller (FB4/DRIVE pins) that drives an external NPN pass transistor to generate a low-noise 2.5V rail. The FB4 pin regulates to 0.800V, and the output voltage is set by a resistor divider; typical applications use this for analog or reference supplies requiring <10mV ripple.
What is the purpose of the VINSW pin on LT3507HUHF#TRPBF?
The VINSW pin on LT3507HUHF#TRPBF is a switched version of VIN1, active only when any RUN pin is high. It serves as the sensing node for the user-programmable OVLO and UVLO comparators, enabling accurate input voltage monitoring without loading the main VIN1 rail during shutdown - critical for reliable fault detection in variable-input systems.
Does LT3507HUHF#TRPBF support synchronization with an external clock source?
Yes - the RT/SYNC pin on LT3507HUHF#TRPBF accepts an external clock signal (1.8V–5V CMOS/TTL) to synchronize switching across multiple devices. This eliminates beat frequencies in multi-phase or stacked power systems and is fully supported across the 250kHz–2.5MHz operating range, with minimum pulse widths of 100ns required.
LT3507HUHF#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) (1), Linear (LDO) (1)
- Number of Outputs:
- 4
- Frequency - Switching:
- 900kHz ~ 1.1MHz
- Voltage/Current - Output 1:
- 0.8V ~ 32.4V, 2.4A
- Voltage/Current - Output 2:
- 0.8V ~ 32.4V, 1.5A
- Voltage/Current - Output 3:
- 0.8V ~ 32.4V, 1.5A
- 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-QFN (5x7)
LT3507HUHF#TRPBF FAQ
1.How can I place an order for LT3507HUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3507HUHF#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 LT3507HUHF#TRPBF reliable?
The price and inventory of LT3507HUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3507HUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3507HUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3507HUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3507HUHF#TRPBF?
LT3507HUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3507HUHF#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 LT3507HUHF#TRPBF?
For technical support, including LT3507HUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3507HUHF#TRPBF requirements.
6.How does Aetrix verify that LT3507HUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3507HUHF#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 LT3507HUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3507HUHF#TRPBF?
All LT3507HUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3507HUHF#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 LT3507HUHF#TRPBF part is unused and in its original packaging.
Return procedure for LT3507HUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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