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Analog Devices Inc. LTC3787HUFD#PBF
- Part No.:
- LTC3787HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787HUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
LTC3787HUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC designed for high-efficiency, high-power DC/DC conversion in demanding industrial and automotive systems. It supports 4.5V–38V input, delivers up to 60V output, operates down to 2.5V after startup, features ±1% 1.200V reference accuracy, and enables 2-/3-/4-/6-/12-phase configurations via PolyPhase® architecture.
For engineers reviewing the LTC3787HUFD#PBF datasheet, LTC3787HUFD#PBF pinout, LTC3787HUFD#PBF application, or LTC3787HUFD#PBF equivalent, key selection criteria include its 28-pin 4mm × 5mm QFN package with exposed thermal pad, phase-lockable 75kHz–850kHz frequency range, RSENSE/DCR current sensing, 100% duty cycle capability, and –40°C to +150°C junction temperature rating.
Technical Context
The LTC3787HUFD#PBF implements constant-frequency current-mode control across two out-of-phase N-channel MOSFET stages, reducing input/output capacitor requirements and system noise. Its dual-channel architecture supports programmable phase relationships via PHASMD and daisy-chain synchronization via CLKOUT for multi-phase scalability.
It integrates an internal 5.4V LDO (INTVCC) powered from VBIAS or EXTVCC, low-quiescent-current sleep mode (135μA), and three light-load operation modes-Burst Mode®, pulse-skipping, and forced continuous-selected via the PLLIN/MODE pin. The controller maintains regulation during transients down to 2.5V VIN and supports both sense-resistor and inductor DCR current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (operates down to 2.5V after startup - enables brownout resilience in battery-fed systems) |
| Output Voltage Range | Up to 60V (supports wide-range industrial bus and LED driver applications) |
| Reference Voltage Accuracy | ±1% at 1.200V (ensures tight output regulation over temperature and load) |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode (minimizes standby power loss) |
| Switching Frequency Range | 50kHz to 900kHz programmable or 75kHz to 850kHz PLL-synchronizable (enables EMI optimization and magnetics size reduction) |
| Max Junction Temperature | 150°C (H-grade qualification - suitable for under-hood automotive and high-ambient industrial environments) |
| Package Thermal Resistance | θJA = 43°C/W (28-pin 4mm × 5mm QFN with exposed pad - enables high-power density without heatsink) |
Pinout & Package
28-pin plastic QFN (4mm × 5mm) with exposed thermal pad (Pin 29 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator control input | Resistor-to-GND sets 50–900kHz fixed frequency; voltage bias or external clock enables fine tuning or synchronization |
| PLLIN/MODE (Pin 4) | Mode selection & sync input | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC−1.3V) = pulse-skipping; external clock = PLL sync |
| SENSE1+/SENSE1− (Pins 2,3) | Channel 1 current sense inputs | Differential pair accepting 2.5V–38V common-mode voltage - supports RSENSE or DCR sensing with 42–110mV threshold range |
| VFB (Pin 10) | Error amplifier feedback input | Compares resistive divider output against 1.200V reference to regulate output voltage with ±1% accuracy |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Directly sets peak inductor current trip point; voltage range determines current limit scaling |
| TG1/TG2 (Pins 14,23 / 17,26) | Top gate drivers | Drive synchronous N-MOSFET gates with 1.2Ω pull-up/pull-down and 20ns rise/fall times |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% from regulation - 25μs delay prevents false triggering during transients |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® multi-phase support | Configurable for 2-, 3-, 4-, 6-, or 12-phase operation - reduces ripple current, capacitor stress, and EMI vs single-phase designs |
| Synchronous rectification | Drives both top and bottom N-MOSFETs per phase - eliminates body-diode conduction losses and improves efficiency at high loads |
| 100% duty cycle capability | Enables boost operation with VIN approaching VOUT - critical for low-dropout boost applications like battery backup systems |
| Low IQ sleep mode | 135μA quiescent current in light-load operation - extends battery life in always-on industrial sensors and telematics |
| Robust thermal grade | H-grade (–40°C to +150°C TJ) - qualified for under-hood automotive, motor drives, and high-ambient factory automation |
Applications
| Automotive ADAS Power Supply | Industrial 24V-to-48V Bus Converter |
|---|---|
Use Scenario: Powering radar modules and camera systems from 12V vehicle battery with strict EMI and transient immunity requirements. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing 12V→24V/10A conversion with phase interleaving to suppress input ripple and conducted emissions. Use Value: 2-phase operation cuts input capacitor count by 50% and reduces peak inductor current stress versus single-phase, enabling compact, AEC-Q200-compliant layout. |
Use Scenario: Up-converting 24V factory floor supply to 48V for servo drive logic and communication interfaces. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated 48V output with 150°C junction rating for continuous operation in enclosed control cabinets. Use Value: 150°C H-grade qualification and 43°C/W θJA enable reliable 10A+ output without forced air cooling in space-constrained industrial enclosures. |
| Medical Imaging LED Driver | Military Portable Radio Transmitter |
Use Scenario: Driving high-intensity X-ray detector backlight arrays requiring stable 60V bias with minimal output noise. IC Role / Device Role / Timing Role: Precision boost controller regulating up to 60V output with ±1% reference and soft-start (SS pin) to prevent inrush-induced sensor saturation. Use Value: ±1% VREF and programmable soft-start ensure repeatable, low-noise illumination pulses essential for diagnostic image fidelity. |
Use Scenario: Generating 28V PA supply from 12V tactical battery in manpack radios operating in extreme desert or arctic conditions. IC Role / Device Role / Timing Role: Wide-input, high-temp boost controller supporting 12V→28V conversion with Burst Mode® for ultra-low standby drain and cold-start capability down to 2.5V VIN. Use Value: 2.5V minimum operating voltage after startup and 8μA shutdown current extend operational time between battery swaps in field-deployed equipment. |
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#PBF | Same functionality and pinout; rated for –40°C to +125°C TJ (vs. +150°C for H-grade) | Not qualified for extended high-temp environments such as engine compartments or sealed industrial enclosures | Select when ambient temperature remains below 105°C and cost sensitivity outweighs thermal margin needs. |
| LTC3787MPUFD#PBF | Same functionality and pinout; rated for –55°C to +150°C TJ with full military screening | Includes extended temperature testing, enhanced reliability screening, and controlled manufacturing per MIL-PRF-38535 | Select for aerospace, defense, or critical infrastructure where extended low-temp start-up and long-term reliability validation are mandatory. |
Compared with LTC3787IUFD#PBF, the LTC3787HUFD#PBF provides 25°C higher maximum junction temperature for sustained high-power operation in thermally constrained spaces; compared with LTC3787MPUFD#PBF, it omits military screening but retains identical H-grade thermal specs at lower cost and lead time.
Availability
LTC3787HUFD#PBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 24V-to-48V bus converters, and medical imaging LED drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3787HUFD#PBF 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, documentation, and manufacturing continuity for all Linear ICs including the LTC3787 series.
The LTC3787 belongs to Linear's high-performance PolyPhase® controller family, engineered specifically for high-efficiency, multi-phase DC/DC boost conversion in automotive, industrial, and medical systems demanding wide input range, precise regulation, and rugged thermal performance.
FAQ
What is the maximum output voltage supported by the LTC3787HUFD#PBF?
The LTC3787HUFD#PBF supports output voltages up to 60V. This is enabled by its robust gate drivers and high-voltage-compatible internal circuitry, allowing it to drive external N-channel MOSFETs in boost configurations where VOUT significantly exceeds VIN. The absolute maximum ratings confirm BOOST1/BOOST2 pins tolerate up to 76V, ensuring safe operation within this range.
How does the LTC3787HUFD#PBF achieve thermal robustness in high-temperature environments?
The LTC3787HUFD#PBF achieves thermal robustness through H-grade qualification (–40°C to +150°C junction temperature), a 4mm × 5mm QFN package with exposed thermal pad (Pin 29 = GND), and low thermal resistance (θJA = 43°C/W). Proper PCB layout-soldering the exposed pad to a large copper area-ensures efficient heat transfer, enabling continuous 10A+ operation in sealed enclosures or under-hood locations.
Can the LTC3787HUFD#PBF operate with input voltage below 4.5V?
Yes - the LTC3787HUFD#PBF can operate with input voltage as low as 2.5V after startup, though its specified input range is 4.5V to 38V. This brownout recovery capability allows continued regulation during severe line sags or battery depletion, provided the device has already started and is biased from VOUT or an auxiliary supply (VBIAS).
What current sensing methods does the LTC3787HUFD#PBF support?
The LTC3787HUFD#PBF supports both RSENSE (shunt resistor) and inductor DCR current sensing. Its SENSE1+/SENSE1− and SENSE2+/SENSE2− inputs accept a 2.5V–38V common-mode voltage range and offer three selectable peak sense thresholds (42mV, 75mV, 100mV) via the ILIM pin connection, enabling flexible, accurate current monitoring across diverse power stage designs.
Is the LTC3787HUFD#PBF pin-compatible with other variants in the LTC3787 family?
Yes - the LTC3787HUFD#PBF is fully pin-compatible with all UFD-package variants (e.g., LTC3787EUFD#PBF, LTC3787IUFD#PBF, LTC3787MPUFD#PBF). All share identical 28-pin 4mm × 5mm QFN footprints, pin assignments, and electrical behavior; only the temperature grade and screening level differ, enabling drop-in replacement based on environmental requirements.
LTC3787HUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3787HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787HUFD#PBF 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#PBF reliable?
The price and inventory of LTC3787HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3787HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787HUFD#PBF?
LTC3787HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787HUFD#PBF 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#PBF?
For technical support, including LTC3787HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787HUFD#PBF requirements.
6.How does Aetrix verify that LTC3787HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3787HUFD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3787HUFD#PBF?
All LTC3787HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787HUFD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3787HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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