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Analog Devices Inc. LT3507AHUHF#TRPBF
- Part No.:
- LT3507AHUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LT3507AHUHF#TRPBF.pdf
- Description:
- IC REG QD BUCK/LINEAR 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,083
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Product details
Overview
LT3507AHUHF#TRPBF from Analog Devices (formerly Linear Technology) is a triple monolithic step-down DC/DC converter with integrated 2.7A and dual 1.8A 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/microcontroller supply sequencing in automotive and industrial systems.
For engineers reviewing the LT3507AHUHF#TRPBF datasheet, LT3507AHUHF#TRPBF pinout, LT3507AHUHF#TRPBF application, or LT3507AHUHF#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, confirmed thermal rating (–40°C to 150°C), real-world ripple reduction behavior via antiphase operation, and two validated alternative parts with documented functional trade-offs.
Technical Context
The LT3507AHUHF#TRPBF implements three independent current-mode step-down regulators sharing a master oscillator, with Channel 1 operating 180° out-of-phase with Channels 2 and 3 to reduce input ripple current. Each channel features dedicated VC error amplifier output, TRK/SS pin for tracking/soft-start, and PGOOD open-collector indicator.
It integrates internal bipolar NPN power switches, uses BOOST pins to generate gate drive above VIN, and includes user-programmable OVLO/UVLO thresholds (1.20V ±50mV) with hysteresis. The LDO section employs an external NPN transistor driven by the DRIVE pin and regulated via FB4 to 800mV ±12mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide-range industrial and automotive battery inputs without pre-regulation |
| Output Current Capability | 2.7A (Channel 1), 1.8A (Channels 2 & 3) - enables single-chip triple-rail power for multi-core DSPs or FPGAs |
| Switching Frequency Range | 250kHz to 2.5MHz - adjustable via RT resistor; allows optimization of size (high-freq) vs efficiency (low-freq) |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments |
| Feedback Reference Voltage | 800mV ±12mV - precise regulation point enabling accurate output setting with standard resistor dividers |
| Power Good Threshold Accuracy | ±58mV to ±105mV - ensures reliable sequencing margin before microcontroller release |
| Shutdown Current | 1µA - enables ultra-low-power standby in battery-backed systems |
Pinout & Package
LT3507AHUHF#TRPBF is housed in a thermally enhanced 38-lead (5mm × 7mm) plastic QFN package with exposed GND pad (Pin 39) requiring PCB soldering for thermal and electrical integrity. θJA = 34°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; requires local bypassing; powers startup logic |
| SW1/SW2/SW3 | Switch node outputs for each buck converter | Connect directly to inductor/diode; high dV/dt nodes requiring careful layout |
| BOOST1/BOOST2/BOOST3 | Charge pump drive for internal NPN switch saturation | Requires external diode + capacitor; minimum boost voltage above SW is 2.5V |
| FB1/FB2/FB3/FB4 | Negative inputs of error amplifiers | Regulated to 800mV; sets output voltage via resistor divider; bias current ≤ –500nA |
| VC1/VC2/VC3 | Error amplifier outputs controlling peak switch current | Clamped at 1.8V; >0.9V required to enable switching; used for loop compensation |
| PGOOD1/PGOOD2/PGOOD3 | Open-collector status indicators | Pull-up required; assert high when respective FB reaches 90% of regulation; valid only if VIN > 3.8V and RUN active |
| RUN1/RUN2/RUN3 | Individual enable inputs for each buck channel | Logic-high >1.25V enables; all low disables entire IC and reduces current to <1µA |
| TRK/SS1–TRK/SS4 | Tracking/soft-start control inputs | Sourcing 1.25µA; below 0.8V overrides FB reference for coordinated start-up or ramp control |
| DRIVE | Base drive output for external LDO NPN transistor | Current-limited to 22.5mA; dropout from BIAS is 0.5–0.8V; enables high-current linear regulation |
| RT/SYNC | Oscillator frequency programming or external clock input | Accepts 1.8–5V CMOS/TTL sync signal or resistor to ground (40.2kΩ = 1MHz typical) |
| GND (Pin 39) | Power and signal ground reference | Exposed thermal pad must be soldered to PCB ground plane for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Antiphase switching architecture | Reduces RMS input ripple current by canceling harmonic components between Channel 1 and Channels 2+3 |
| Independent soft-start and tracking | Four TRK/SS pins enable programmable ramp rates and ratiometric sequencing across all four outputs |
| Programmable over/undervoltage lockout | OVLO/UVLO pins accept resistor dividers to set custom input fault thresholds with 10µA hysteresis current |
| Thermal protection with foldback | Frequency foldback activates below 50% FB voltage during overload, limiting peak switch current without shutdown |
| High-temperature qualification | Rated for continuous operation up to 150°C junction temperature - exceeds AEC-Q100 Grade 1 requirements |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supplying 1.8V core, 3.3V I/O, 5V analog, and 2.5V DDR rails for a head-unit SoC with strict sequencing and thermal constraints. IC Role / Device Role / Timing Role: Triple synchronous buck + LDO controller providing four precisely tracked outputs with antiphase ripple cancellation and PGOOD coordination. Use Value: Eliminates need for discrete sequencing ICs; reduces input capacitor count by 40% due to phase cancellation; meets ASIL-B thermal derating requirements. | Use Scenario: Generating isolated 5V, 3.3V, and 1.8V supplies for FPGA, ADC, and microcontroller in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Centralized multi-rail DC/DC controller managing rail ordering, fault reporting, and thermal margin via RUN/PGOOD interface. Use Value: Enables single-board power architecture with <150°C max junction temp; simplifies BOM by integrating three bucks and LDO driver in one QFN. |
| DSP-Based Motor Control | Medical Imaging Sensor Interface |
Use Scenario: Powering TI C6000 DSP, gate drivers, and op-amps in servo drive electronics where EMI and thermal density are critical. IC Role / Device Role / Timing Role: High-efficiency triple-output regulator delivering 2.7A @ 1.2V, 1.8A @ 3.3V, and 1.8A @ 5V with synchronized clocks and low-noise LDO for analog front-end. Use Value: Achieves <85% full-load efficiency at 12V input; antiphase operation lowers conducted EMI baseline by 12dB; supports 150°C ambient via thermal pad soldering. | Use Scenario: Providing clean, sequenced power to CCD/CMOS image sensors, precision ADCs, and low-noise amplifiers in portable ultrasound equipment. IC Role / Device Role / Timing Role: Multi-rail controller generating 2.5V sensor bias, 3.3V digital, 1.8V core, and 5V analog with independent soft-start and PGOOD feedback to FPGA supervisor. Use Value: Ensures sub-10mV output ripple on analog rails using ceramic caps; eliminates external sequencing logic; meets IEC 60601 leakage and thermal safety limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3776EUF#PBF | Triple synchronous buck controller (no integrated switches); supports up to 10A per channel; requires external MOSFETs; no integrated LDO driver | Better suited for high-current (>3A/channel), high-efficiency (>95%) designs with layout flexibility; lacks antiphase ripple reduction | Select when higher output current, lower conduction loss, or discrete MOSFET selection is required - not a drop-in replacement |
| TPS544B20RJRT | Single 4A buck converter with PMBus interface; no multi-channel integration; no LDO section; 1.2V reference; smaller 20-pin QFN | Targeted at digitally controlled point-of-load applications; requires three separate ICs for equivalent functionality | Choose for systems needing telemetry, margining, or dynamic voltage scaling - adds complexity and board area versus LT3507AHUHF#TRPBF's integrated solution |
Compared with LTC3776EUF#PBF and TPS544B20RJRT, the LT3507AHUHF#TRPBF uniquely integrates three buck channels with antiphase operation, an LDO driver, and 150°C operation in one QFN - reducing component count, layout area, and thermal management effort for compact multi-rail systems.
Availability
LT3507AHUHF#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and DSP-based motor control requiring stable component supply, extended temperature support, and multi-rail integration.
Supply support for LT3507AHUHF#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.
The LT3507A product line was designed specifically for space-constrained, high-reliability applications demanding multiple regulated outputs with precise sequencing, thermal robustness, and minimal external components - targeting automotive, industrial, and medical power systems.
FAQ
What is the maximum junction temperature rating for LT3507AHUHF#TRPBF?
The LT3507AHUHF#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 –40°C to 125°C range of the E/I-grade variants and is verified per Linear Technology's characterization and statistical process controls.
How does antiphase switching reduce input ripple in LT3507AHUHF#TRPBF?
The LT3507AHUHF#TRPBF configures Channel 1 (2.7A) 180° out-of-phase with Channels 2 and 3 (1.8A each), causing their input current harmonics to partially cancel at the VIN1 node. This reduces RMS input ripple current by up to 40% compared to in-phase operation, allowing smaller input bulk capacitors and lowering EMI filter requirements - a key advantage in dense automotive and industrial layouts.
Can LT3507AHUHF#TRPBF drive an external PNP transistor for the LDO section?
No - the LT3507AHUHF#TRPBF DRIVE pin is designed exclusively to source base current for an external NPN transistor in emitter-follower configuration. Its 22.5mA current limit, 0.5–0.8V dropout from BIAS, and internal clamp structure are optimized for NPN drive; using a PNP would invert polarity and violate the error amplifier's feedback topology, preventing regulation.
What is the purpose of the VINSW pin on LT3507AHUHF#TRPBF?
The VINSW pin on LT3507AHUHF#TRPBF provides a switched version of VIN1 that connects to the internal UVLO/OVLO comparators only when any RUN pin is asserted. It isolates undervoltage/overvoltage detection from the main input during shutdown, preventing false trips. When all RUN pins are low, VINSW goes high-impedance - ensuring accurate fault detection only during active operation.
Does LT3507AHUHF#TRPBF support synchronization to an external clock?
Yes - the RT/SYNC pin on LT3507AHUHF#TRPBF accepts an external CMOS or TTL clock signal (1.8V–5V logic levels, min 100ns pulse width) to synchronize switching across multiple LT3507AHUHF#TRPBF devices or with system clocks. This eliminates beat frequencies, eases EMI compliance, and enables deterministic timing in multi-rail systems - while retaining full frequency foldback protection during faults.
LT3507AHUHF#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LT3507AHUHF#TRPBF FAQ
1.How can I place an order for LT3507AHUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3507AHUHF#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 LT3507AHUHF#TRPBF reliable?
The price and inventory of LT3507AHUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3507AHUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3507AHUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3507AHUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3507AHUHF#TRPBF?
LT3507AHUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3507AHUHF#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 LT3507AHUHF#TRPBF?
For technical support, including LT3507AHUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3507AHUHF#TRPBF requirements.
6.How does Aetrix verify that LT3507AHUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3507AHUHF#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 LT3507AHUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3507AHUHF#TRPBF?
All LT3507AHUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3507AHUHF#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 LT3507AHUHF#TRPBF part is unused and in its original packaging.
Return procedure for LT3507AHUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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