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Analog Devices Inc. LTC3787HUFD#TRPBF
- Part No.:
- LTC3787HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787HUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,813
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Product details
Overview
LTC3787HUFD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller driving two N-channel MOSFET stages out-of-phase to reduce input/output capacitance and power supply noise. It operates from 4.5V–38V input (down to 2.5V post-startup), delivers up to 60V output, features ±1% 1.200V reference, and supports RSENSE or DCR current sensing in industrial and automotive high-power boost applications.
For engineers reviewing the LTC3787HUFD#TRPBF datasheet, LTC3787HUFD#TRPBF pinout, LTC3787HUFD#TRPBF application, or LTC3787HUFD#TRPBF equivalent, key selection considerations include its 2–12-phase PolyPhase® capability, 75kHz–850kHz phase-lockable frequency, 135μA quiescent current in pulse-skipping mode, thermally enhanced 4mm × 5mm QFN package rated for –40°C to 150°C junction temperature, and dual independent current-sense channels with matched thresholds.
Technical Context
The LTC3787HUFD#TRPBF implements constant-frequency current-mode control with two independent PWM channels operating 180° out-of-phase. Its error amplifier compares VFB against a precision 1.200V reference, modulating ITH voltage to regulate peak inductor current per channel. The internal 5.4V LDO powers gate drivers from either VBIAS (via INTVCC) or EXTVCC (switchover at 4.8V), enabling efficient biasing across wide input ranges.
Phase synchronization is achieved via PLLIN/MODE pin, supporting external clock locking (75kHz–850kHz), Burst Mode®, pulse-skipping, or forced continuous operation. Current sensing uses differential SENSE+ and SENSE– inputs with common-mode range of 2.5V–38V and programmable trip thresholds (42mV/68mV/90mV) set by ILIM pin state (GND/floating/INTVCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (40V abs max); operates down to 2.5V after startup - enables compatibility with 12V/24V battery systems and transient-tolerant designs. |
| Output Voltage Range | Up to 60V - supports high-voltage industrial bus generation and LED driver supplies. |
| Reference Voltage Accuracy | ±1% at 1.200V - ensures tight output regulation across temperature and load. |
| Quiescent Current | 135μA in pulse-skipping mode - minimizes standby power loss in always-on systems. |
| Switching Frequency Range | 50kHz to 900kHz programmable; 75kHz to 850kHz synchronizable - allows EMI optimization and inductor size reduction. |
| Current Sense Thresholds | 42mV / 68mV / 90mV (ILIM = GND / float / INTVCC) - provides design flexibility for RSENSE or DCR sensing with matched channel tolerance ≤ ±12mV. |
| Thermal Rating | Junction temperature range –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed pad (Pin 29 = GND), θJA = 43°C/W. Requires soldered thermal pad for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or tie to INTVCC/GND selects fixed frequencies - enables precise EMI management. |
| PLLIN/MODE (Pin 4) | Sync input / light-load mode select | Accepts external clock (75kHz–850kHz) for phase locking; configures Burst Mode® (GND), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC). |
| SENSE1+/SENSE1– (Pins 2,3) | Differential current sense inputs (Channel 1) | Supports RSENSE or DCR sensing with 2.5V–38V common-mode range; matched to SENSE2± within ±12mV - critical for balanced multiphase current sharing. |
| VFB (Pin 10) | Error amplifier feedback input | Compares remote output voltage (via resistor divider) to 1.200V reference - determines output regulation accuracy and loop stability. |
| ITH (Pin 11) | Error amplifier output / current limit threshold | Directly sets peak inductor current per phase; voltage range 0.425V–2V defines minimum/maximum current limits - core of current-mode control loop. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% from regulation for ≥25μs - enables system-level fault detection and sequencing. |
| EXPOSED PAD (Pin 29) | Thermal ground | Mandatory PCB connection to GND plane - essential for achieving θJA = 43°C/W and reliable 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2–12-phase operation | Reduces input/output capacitor requirements by √N and enables scalable high-current designs without paralleling controllers. |
| Synchronous rectification support | Drives both top and bottom N-MOSFETs with 100% duty cycle capability - eliminates body-diode conduction losses and improves efficiency >90% at full load. |
| Programmable current sense thresholds | Three discrete levels (42/68/90mV) selected via ILIM pin - simplifies layout for RSENSE or DCR while maintaining channel matching. |
| Low IQ sleep mode | 135μA quiescent current in pulse-skipping mode - extends battery life in portable or backup power systems. |
| Robust thermal packaging | 4mm × 5mm QFN with exposed thermal pad and 43°C/W θJA - sustains 150°C junction temperature in compact, high-power-density layouts. |
Applications
| Automotive ADAS Power Supply | Industrial 48V Bus Generator |
|---|---|
Use Scenario: Generating stable 48V rail from 12V vehicle battery for radar/LiDAR modules requiring low-noise, high-reliability power. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two interleaved 24V→48V stages with phase offset to suppress input ripple. Use Value: 2-phase operation cuts input capacitor requirements by 50% and reduces EMI emissions below CISPR-25 Class 5 limits. |
Use Scenario: Converting 24V factory floor supply to regulated 48V for PoE++ switches and servo drives in harsh industrial settings. IC Role / Device Role / Timing Role: High-voltage boost controller operating at 300kHz with EXTVCC bias to minimize thermal stress during continuous 10A output. Use Value: 150°C-rated QFN package and 2.5V–38V VIN range ensure uninterrupted operation during brownouts and ambient temperature excursions. |
| Medical Imaging HV Bias Supply | Military Portable Radio Transmitter |
Use Scenario: Providing tightly regulated 60V bias for CCD/CMOS image sensor arrays in portable ultrasound devices with strict leakage and noise constraints. IC Role / Device Role / Timing Role: Precision boost controller using ±1% 1.200V reference and soft-start (SS pin) to prevent inrush-induced sensor damage. Use Value: Low 135μA quiescent current and programmable burst mode extend battery runtime between scans without compromising startup repeatability. |
Use Scenario: Powering RF power amplifiers in manpack radios requiring 28V output from 12V Li-ion battery with MIL-STD-810G shock/vibe resilience. IC Role / Device Role / Timing Role: Dual-NMOS controller with 100% duty cycle support and robust 40V abs-max SW/BOOST pins for transient survivability. Use Value: Matched current-sense thresholds (≤±12mV) ensure balanced phase current sharing under vibration-induced parasitic impedance shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3787IUFD#TRPBF | Same silicon, rated for –40°C to 125°C junction temperature (vs. 150°C for H-grade) | Lower thermal margin; unsuitable for under-hood or sealed high-ambient enclosures | Select when cost sensitivity outweighs extended temperature requirement and board-level derating is acceptable. |
| LTC3787MPUFD#TRPBF | Same silicon, tested and guaranteed over –55°C to 150°C with enhanced screening | Required for space, defense, or extreme-cold industrial deployments with full-spec lifetime validation | Choose for mission-critical systems where extended temperature qualification and lot traceability are mandatory. |
Compared with LTC3787HUFD#TRPBF, the I-grade offers lower cost but reduced thermal headroom, while the MP-grade adds military-grade screening and cold-start assurance at higher unit price - all share identical pinout, electrical specs, and feature set.
Availability
LTC3787HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 48V bus generators, medical imaging HV bias supplies, and military portable radio transmitters requiring stable component supply across extended temperature ranges.
Supply support for LTC3787HUFD#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 analog IC portfolio, emphasizing precision, reliability, and ruggedized operation for demanding applications.
The LTC3787HUFD#TRPBF belongs to Linear's PolyPhase® synchronous controller product line, designed specifically for high-efficiency, multi-phase DC/DC conversion in automotive, industrial, and medical systems where thermal resilience and output accuracy are critical.
FAQ
What is the maximum output voltage supported by the LTC3787HUFD#TRPBF?
The LTC3787HUFD#TRPBF supports output voltages up to 60V. This capability is enabled by its high-voltage gate drivers and robust 70V absolute maximum ratings on SW1/SW2 pins, making it suitable for high-bus applications such as 48V industrial systems and medical imaging bias supplies. The actual achievable output depends on external MOSFET selection, inductor rating, and loop compensation stability.
How does the LTC3787HUFD#TRPBF achieve thermal resilience in automotive under-hood environments?
The LTC3787HUFD#TRPBF achieves thermal resilience through its H-grade qualification (–40°C to 150°C junction temperature), 4mm × 5mm QFN package with exposed thermal pad (Pin 29), and low 43°C/W θJA. When properly soldered to a 4-layer PCB with thermal vias to inner ground planes, the LTC3787HUFD#TRPBF sustains continuous operation at full load in ambient temperatures exceeding 105°C - meeting AEC-Q100 Grade 0 requirements with margin.
Can the LTC3787HUFD#TRPBF operate with only one phase enabled?
Yes, the LTC3787HUFD#TRPBF can be configured for single-phase operation by grounding PHASMD and disabling one channel's gate drive signals externally. However, its architecture is optimized for 2-phase interleaving; single-phase use forfeits input/output ripple reduction and requires larger magnetics and capacitors. For dedicated single-phase designs, Linear's LTC3781 is a more appropriate alternative.
What is the role of the EXTVCC pin on the LTC3787HUFD#TRPBF, and when should it be used?
The EXTVCC pin on the LTC3787HUFD#TRPBF provides an auxiliary 4.8V–6V input to bypass the internal VBIAS LDO and directly power INTVCC. It should be used when system-level efficiency is critical and a clean, low-noise 5V supply is available - reducing thermal dissipation in the controller and improving PSRR. Leaving EXTVCC unconnected defaults to VBIAS-powered operation.
How does the LTC3787HUFD#TRPBF handle current sensing mismatch between its two phases?
The LTC3787HUFD#TRPBF guarantees current sense threshold matching of ≤±12mV between Channel 1 and Channel 2 when ILIM is tied to the same reference (e.g., INTVCC). This matching, combined with independent ITH control per phase, ensures balanced current sharing across temperature and load. External layout symmetry (matched trace lengths, Kelvin connections) remains essential to preserve this matching in production.
LTC3787HUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 105kHz ~ 760kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3787HUFD#TRPBF FAQ
1.How can I place an order for LTC3787HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787HUFD#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 LTC3787HUFD#TRPBF reliable?
The price and inventory of LTC3787HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787HUFD#TRPBF?
LTC3787HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787HUFD#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 LTC3787HUFD#TRPBF?
For technical support, including LTC3787HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3787HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787HUFD#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 LTC3787HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787HUFD#TRPBF?
All LTC3787HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787HUFD#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 LTC3787HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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