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Analog Devices Inc. LTC3787IUFD#TRPBF
- Part No.:
- LTC3787IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787IUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
LTC3787IUFD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase synchronous boost controller IC 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 LTC3787IUFD#TRPBF datasheet, LTC3787IUFD#TRPBF pinout, LTC3787IUFD#TRPBF application, or LTC3787IUFD#TRPBF equivalent, key selection criteria include its 2-phase PolyPhase® architecture, programmable 50kHz–900kHz switching frequency, 135μA quiescent current in pulse-skipping mode, and thermally enhanced 4mm × 5mm QFN package with exposed ground pad.
Technical Context
The LTC3787IUFD#TRPBF implements constant-frequency current-mode control with two independent channels operating 180° out-of-phase. Its error amplifier compares VFB against a precision 1.200V reference, while ITH sets peak inductor current threshold across both phases. The internal 5.4V LDO powers gate drivers from either VBIAS or EXTVCC, with automatic switchover at 4.8V.
Phase synchronization is achieved via PLLIN/MODE pin-accepting external clocks (75kHz–850kHz) for forced continuous mode or selecting Burst Mode®, pulse-skipping, or continuous conduction based on DC voltage level. Soft-start is controlled by SS pin with 10μA internal charge current, and PGOOD monitors output regulation with ±10% trip threshold and 25μs delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (abs max 40V); operates down to 2.5V after startup-enables wide battery and system rail compatibility. |
| Output Voltage Range | Up to 60V-supports high-voltage industrial and automotive loads such as LED strings or auxiliary supplies. |
| Reference Voltage | ±1% 1.200V-ensures tight output regulation accuracy over temperature and line/load conditions. |
| Quiescent Current | 135μA in pulse-skipping mode-minimizes standby power loss in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or syncable 75kHz–850kHz-allows EMI optimization and inductor size reduction. |
| Current Sensing | RSENSE or inductor DCR-enables flexible, low-loss sensing without additional resistors in high-current designs. |
| Package | 28-pin 4mm × 5mm QFN with exposed thermal pad-provides θJA = 43°C/W for high-power density thermal management. |
Pinout & Package
Package: 28-lead plastic QFN (4mm × 5mm), exposed pad (Pin 29) connected to PGND for thermal and electrical integrity. θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator control input | Sets switching frequency via resistor-to-GND (50–900kHz) or DC voltage; GND = 350kHz, INTVCC = 535kHz. |
| PLLIN/MODE (Pin 4) | Sync input / light-load mode select | Accepts external clock (75–850kHz) or selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC). |
| SENSE1+/SENSE1− (Pins 2,3) | Channel 1 current sense inputs | Differential inputs for RSENSE or DCR sensing; common-mode range 2.5V–38V; supports 42–110mV threshold depending on ILIM setting. |
| VFB (Pin 13) | Error amplifier feedback input | Compares output divider voltage against 1.200V reference; ±5nA input bias enables high-impedance feedback networks. |
| ITH (Pin 14) | Error amplifier output / current limit threshold | DC voltage sets peak inductor current per phase; 0.425V minimum disables switching in Burst Mode®. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% from regulation; 25μs debounce prevents false trips during transients. |
| PGND (Pin 22) | Power ground return | Low-impedance return path for bottom MOSFET sources and input/output capacitors; must be star-connected to SGND. |
| Exposed Pad (Pin 29) | Thermal & electrical ground | Must be soldered to PCB copper pour for rated thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2-phase operation | Reduces RMS input/output capacitor ripple current by ~70%, enabling smaller bulk capacitance and lower ESR requirements. |
| Synchronous rectification | Eliminates body-diode conduction losses in both high-side and low-side paths, increasing efficiency >3% at 10A output vs. diode-based designs. |
| 100% duty cycle capability | Enables boost operation with VIN approaching VOUT-critical for cold-crank automotive scenarios where input dips to 2.5V. |
| Internal 5.4V LDO with EXTVCC switchover | Reduces thermal load on VBIAS supply; bypasses internal regulator when EXTVCC ≥4.8V, improving system efficiency in multi-rail designs. |
| Three light-load operating modes | Burst Mode® (135μA IQ), pulse-skipping, or forced continuous-lets designers optimize efficiency vs. output ripple trade-offs per application. |
Applications
| Automotive LED Headlamp Supply | Industrial 24V-to-48V Boost Converter |
|---|---|
Use Scenario: Driving high-brightness LED arrays requiring stable 48V from a 12V vehicle battery with cold-crank tolerance down to 2.5V. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two parallel power stages with interleaved timing to minimize input ripple and EMI. Use Value: Enables compact 2-layer PCB design using 3.3μH inductors and 220μF total output capacitance while maintaining >94% efficiency at 10A load. | Use Scenario: Generating regulated 48V bus from 24V industrial PLC backplane for PoE++ or servo drive interfaces. IC Role / Device Role / Timing Role: High-efficiency PolyPhase® controller delivering up to 60V output with precise voltage regulation and robust transient response. Use Value: Achieves <8mW no-load power loss and maintains ±1% output accuracy across –40°C to 125°C ambient, meeting IEC 61000-4-5 surge immunity requirements. |
| Medical Imaging Power Module | Military Radar Bias Supply |
Use Scenario: Providing low-noise, tightly regulated 60V bias for CCD/CMOS sensor arrays in portable ultrasound equipment. IC Role / Device Role / Timing Role: Synchronous boost controller with programmable soft-start (SS pin) and PGOOD monitoring for safe power sequencing. Use Value: Delivers <10mVpp output ripple at full load and supports seamless transition between battery and AC adapter inputs without output droop. | Use Scenario: Generating 50V @ 5A for GaN RF amplifier bias in airborne radar systems requiring MIL-STD-810H environmental compliance. IC Role / Device Role / Timing Role: Radiation-tolerant (I-grade) dual-phase controller with extended temperature range (–40°C to 125°C) and robust overvoltage protection. Use Value: Maintains stable operation under 10g vibration and 5000m altitude conditions while supporting phase-locking to system master clock for coherent signal generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781IUFD#TRPBF | Single-phase architecture; identical 4.5V–38V input, 60V output, and 1.200V reference-but lacks PolyPhase® capability and phase synchronization. | Suitable for lower-power (<5A) or space-constrained designs where interleaving benefits are unnecessary. | Select LTC3781IUFD#TRPBF only when dual-phase operation and reduced input ripple are not required. |
| LM5122MMX/NOPB | Single-phase controller with 3V–65V input, 100V abs max; supports DCR sensing but no Burst Mode®; higher 250μA quiescent current. | Better suited for ultra-wide VIN applications (e.g., 12V–48V telecom) where 65V input range exceeds LTC3787IUFD#TRPBF's 38V rating. | Choose LM5122MMX/NOPB when input voltage may exceed 38V or when TI ecosystem support is preferred. |
Compared with LTC3781IUFD#TRPBF and LM5122MMX/NOPB, the LTC3787IUFD#TRPBF uniquely delivers dual-phase interleaving, 135μA light-load IQ, and seamless 2.5V dropout operation-making it optimal for high-efficiency, high-current boost designs where thermal density and EMI are critical constraints.
Availability
LTC3787IUFD#TRPBF is available at Aetrix Electronics and suitable for automotive LED lighting, industrial 24V-to-48V conversion, and medical imaging power modules requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3787IUFD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3787IUFD#TRPBF belongs to ADI's Power by Linear™ polyphase controller family, engineered specifically for high-efficiency, high-current DC/DC boost conversion in demanding industrial, automotive, and medical systems where thermal performance and reliability are paramount.
FAQ
What is the maximum output voltage supported by the LTC3787IUFD#TRPBF?
The LTC3787IUFD#TRPBF supports an output voltage up to 60V. This is enabled by its high-voltage gate drivers and robust internal circuitry rated for BOOST1/BOOST2 pins up to 76V and SW1/SW2 pins up to 70V. The actual achievable output depends on external MOSFET ratings, inductor saturation current, and output capacitor voltage rating-designers must ensure all external components meet or exceed these stress limits when targeting 60V operation.
How does the LTC3787IUFD#TRPBF achieve 100% duty cycle operation?
The LTC3787IUFD#TRPBF achieves 100% duty cycle by disabling the top MOSFET (TG) driver while keeping the bottom MOSFET (BG) continuously on-effectively acting as a pass-through switch. This mode activates when the input voltage approaches the regulated output voltage, allowing operation down to 2.5V input after startup. It is implemented via internal logic that monitors ITH and VFB, and requires proper layout of the BG driver path to sustain continuous conduction without shoot-through risk.
Can the LTC3787IUFD#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LTC3787IUFD#TRPBF can synchronize to an external clock applied to the PLLIN/MODE pin. The valid synchronization frequency range is 75kHz to 850kHz. When synchronized, the controller enters forced continuous conduction mode and locks the rising edge of BG1 to the rising edge of the external clock. The internal PLL ensures low jitter and stable phase alignment, making it suitable for noise-sensitive systems requiring deterministic switching timing.
What is the purpose of the ILIM pin on the LTC3787IUFD#TRPBF, and how does it affect current sensing?
The ILIM pin on the LTC3787IUFD#TRPBF selects the peak current sense voltage threshold for both channels: tying ILIM to GND sets 50mV, floating sets 75mV, and tying to INTVCC sets 100mV. This directly scales the current limit without changing external sense resistor values. For example, with a 4mΩ sense resistor, ILIM = INTVCC yields 25A peak current per phase (100mV / 4mΩ), while ILIM = GND yields 12.5A-enabling flexible overcurrent protection tuning across different power levels using the same PCB layout.
Does the LTC3787IUFD#TRPBF require external compensation components, and where are they connected?
Yes, the LTC3787IUFD#TRPBF requires external compensation components connected to the ITH pin. A Type II or Type III compensation network-typically consisting of a series RC from ITH to SGND and a capacitor from ITH to VFB-is used to stabilize the current-mode control loop. The exact values depend on inductor value, output capacitance, and desired crossover frequency; Linear Technology Application Note AN140 provides design equations and example values for common configurations using the LTC3787IUFD#TRPBF.
LTC3787IUFD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3787IUFD#TRPBF FAQ
1.How can I place an order for LTC3787IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787IUFD#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 LTC3787IUFD#TRPBF reliable?
The price and inventory of LTC3787IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787IUFD#TRPBF?
LTC3787IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787IUFD#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 LTC3787IUFD#TRPBF?
For technical support, including LTC3787IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3787IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787IUFD#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 LTC3787IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787IUFD#TRPBF?
All LTC3787IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787IUFD#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 LTC3787IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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