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Analog Devices Inc. LTC3787EUFD#TRPBF
- Part No.:
- LTC3787EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3787EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,426
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Product details
Overview
LTC3787EUFD#TRPBF 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 delivers up to 60V output from 4.5V–38V input (operating down to 2.5V post-startup), supports RSENSE or DCR current sensing, and features ±1% 1.200V reference accuracy with 135μA quiescent current.
For engineers reviewing the LTC3787EUFD#TRPBF datasheet, LTC3787EUFD#TRPBF pinout, LTC3787EUFD#TRPBF application, or LTC3787EUFD#TRPBF equivalent, key selection criteria include phase-lockable frequency (75–850kHz), 28-pin 4mm × 5mm QFN package thermal performance (θJA = 43°C/W), PolyPhase® 2-/3-/4-/6-/12-phase scalability, and support for Burst Mode®, pulse-skipping, or forced continuous operation at light loads.
Technical Context
The LTC3787EUFD#TRPBF implements constant-frequency current-mode control across two out-of-phase N-channel MOSFET stages, using an internal error amplifier (gm = 2 mmho) and dual independent current comparators with matched sense thresholds (±12 mV matching). Its architecture enables precise peak-current regulation via the ITH pin while maintaining stable servo-loop feedback through the VFB pin referenced to a trimmed 1.200V bandgap.
It integrates a programmable oscillator (50–900kHz fixed or 75–850kHz PLL-synchronized), dual gate drivers with 1.2Ω pull-up/pull-down resistance and 70ns dead-time control, and a thermally enhanced 5.4V INTVCC LDO powered either from VBIAS (4.5–38V) or EXTVCC (4.8–6V), enabling efficient gate drive under wide input conditions.
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 compatibility with 12V/24V battery systems and transient-tolerant industrial rails. |
| Output Voltage Range | Up to 60V - supports high-voltage LED strings, industrial sensors, and HV bias supplies without external level-shifting. |
| Reference Voltage Accuracy | ±1% (1.188V to 1.212V) - ensures tight output regulation across temperature and load for precision power rails. |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode - minimizes standby power loss in always-on systems. |
| Shutdown Current | <8μA - enables ultra-low-power system sleep states with minimal battery drain. |
| Switching Frequency Range | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - balances efficiency, EMI, and magnetics size across applications. |
| Package Thermal Resistance | θJA = 43°C/W (QFN UFD) - enables high-power operation without forced air cooling in compact layouts. |
Pinout & Package
Thermally enhanced 28-pin 4mm × 5mm plastic QFN (UFD) package with exposed GND pad (Pin 29) requiring PCB solder connection for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2 | Switch Node | Connects to source of synchronous NMOS and drain of main NMOS - defines high-side switching node for each phase. |
| TG1, TG2 | Top Gate Driver Output | Drives gate of synchronous rectifier NMOS - supports 100% duty cycle operation for low-VIN boost scenarios. |
| BG1, BG2 | Bottom Gate Driver Output | Drives gate of main power NMOS - includes 70ns dead-time control to prevent shoot-through. |
| SENSE1+, SENSE1− SENSE2+, SENSE2− | Dual Differential Current Sense Inputs | Accepts RSENSE or DCR-based sensing with 2.5V–38V common-mode range - enables accurate per-phase current limiting and sharing. |
| VFB | Error Amplifier Feedback Input | Compares output voltage (via external resistor divider) to 1.200V reference - sets regulated output voltage with ±1% accuracy. |
| ITH | Error Amplifier Output / Current Limit Threshold | Sets peak inductor current per phase - directly controls output current capability and loop stability via compensation network. |
| PLLIN/MODE | Light-Load Mode Control & External Sync Input | Selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC); accepts external clock for phase synchronization. |
| PGOOD | Open-Drain Power Good Monitor | Asserts low when VOUT deviates >±10% from regulation - provides system-level fault signaling with 25μs delay to avoid false trips. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® 2-/3-/4-/6-/12-phase configuration | Reduces input/output ripple current by up to 90% vs single-phase - allows smaller capacitors and lower ESR requirements. |
| Synchronous rectification with 100% duty cycle support | Eliminates body-diode conduction losses - enables high efficiency (>95%) even at very low input voltages (2.5V). |
| RSENSE or inductor DCR current sensing | Enables flexible, cost-optimized current monitoring without dedicated sense resistors - reduces BOM count and board space. |
| Internal 5.4V LDO with EXTVCC switchover | Reduces power dissipation by bypassing VBIAS LDO when external 4.8–6V supply is available - improves thermal margin in high-current designs. |
| Soft-start via SS pin with 10μA internal current source | Provides linear, controlled VOUT ramp using single external capacitor - prevents inrush current and output overshoot during startup. |
| Three selectable light-load modes | Burst Mode® (135μA IQ), pulse-skipping, or forced continuous - optimizes efficiency across full load range without external circuitry. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Supplies |
|---|---|
Use Scenario: Boosting 12V vehicle battery to 24V/48V for radar modules and camera ISPs in autonomous driving systems. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing high-current, low-noise power delivery with phase interleaving to suppress EMI. Use Value: 2-phase operation cuts input ripple current by 70%, reducing required bulk capacitance and easing EMC compliance for ISO 11452-2/ISO 7637-2 testing. |
Use Scenario: Generating stable 40V bias for high-resolution LiDAR avalanche photodiode (APD) arrays in harsh automotive environments. IC Role / Device Role / Timing Role: High-accuracy, high-voltage boost controller with ±1% reference and 60V output capability operating from cold-cranked 2.5V input. Use Value: 135μA quiescent current and <8μA shutdown current extend battery life during vehicle sleep mode; thermal QFN package sustains 125°C junction temperature. |
| Medical Imaging Power Modules | Military Portable Radios |
Use Scenario: Providing tightly regulated 50V supply for X-ray detector biasing in portable ultrasound and digital radiography equipment. IC Role / Device Role / Timing Role: Precision boost controller with 1.200V ±1% reference and programmable soft-start ensuring repeatable, glitch-free startup under varying load conditions. Use Value: PGOOD output with ±10% trip threshold and 25μs delay enables reliable system-level power sequencing and fault detection per IEC 62304 Class C requirements. |
Use Scenario: Converting 28V aircraft bus to 60V for RF power amplifiers in manpack radios operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Wide-temperature-grade boost controller (E-grade: –40°C to +125°C) with robust overvoltage protection and phase-lockable frequency for EMI reduction. Use Value: PLL synchronization allows multiple LTC3787EUFD#TRPBF units to operate at harmonically aligned frequencies - minimizing beat frequencies in multi-rail RF subsystems. |
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 only; 4.5V–38V input; 60V max output; no PLL sync; 135μA IQ | Lacks PolyPhase® capability and phase synchronization - suitable only for lower-power, non-interleaved designs | Select when total output current ≤ 8A and EMI constraints permit higher input ripple. |
| MP24894GQ-Z | Single-phase; 4.5V–40V input; 60V max output; fixed 300kHz fSW; 100μA IQ; no DCR sensing | No multi-phase support, no programmable frequency, no Burst Mode® - limited light-load optimization | Choose for cost-sensitive, lower-complexity applications where thermal headroom and EMI are less critical. |
Compared with LTC3781IUFD#TRPBF and MP24894GQ-Z, the LTC3787EUFD#TRPBF uniquely delivers scalable PolyPhase® operation, precise 75–850kHz PLL synchronization, and three configurable light-load modes - making it the only option capable of meeting stringent EMI, thermal, and efficiency requirements in >10A high-voltage boost systems.
Availability
LTC3787EUFD#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS power supplies, and medical imaging power modules requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle continuity.
Supply support for LTC3787EUFD#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 and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3787EUFD#TRPBF belongs to Linear's PolyPhase® synchronous controller product line, engineered specifically for high-efficiency, high-power DC/DC boost conversion in noise-sensitive, thermally constrained applications such as radar, LiDAR, and portable medical equipment.
FAQ
What is the absolute maximum input voltage rating for the LTC3787EUFD#TRPBF?
The LTC3787EUFD#TRPBF has an absolute maximum VBIAS rating of 40V, with recommended operating range of 4.5V to 38V. The SENSE pins tolerate up to 40V common-mode voltage, and BOOST1/BOOST2 pins withstand up to 76V. Exceeding 40V on VBIAS risks permanent damage per Absolute Maximum Ratings table.
Does the LTC3787EUFD#TRPBF support inductor DCR current sensing?
Yes, the LTC3787EUFD#TRPBF supports both RSENSE and inductor DCR current sensing. Its SENSE+ and SENSE− inputs feature a 2.5V–38V common-mode range and internal filtering optimized for DCR-based sensing, eliminating the need for discrete sense resistors and reducing power loss.
What is the thermal performance difference between the UFD and GN packages of the LTC3787EUFD#TRPBF?
The LTC3787EUFD#TRPBF uses the 28-pin 4mm × 5mm QFN (UFD) package with θJA = 43°C/W, while the SSOP (GN) variant has θJA = 90°C/W. This 2× lower thermal resistance enables the UFD package to sustain ~2.1× higher power dissipation at the same ambient temperature - critical for high-current boost applications.
How does the PLLIN/MODE pin configure light-load operation on the LTC3787EUFD#TRPBF?
The LTC3787EUFD#TRPBF uses the PLLIN/MODE pin to select light-load behavior: tie to SGND for Burst Mode® (135μA IQ), to INTVCC for forced continuous conduction, or to a 1.2V–(INTVCC−1.3V) voltage for pulse-skipping. An internal 100kΩ pull-down also defaults to Burst Mode® when the pin is floating.
Can the LTC3787EUFD#TRPBF be configured for single-phase operation?
Yes, the LTC3787EUFD#TRPBF can operate in single-phase mode by connecting both TG/BOOST/SW/BG/SENSE channels in parallel and disabling one phase via PHASMD pin configuration. However, its full value is realized in dual-phase or PolyPhase® configurations where ripple cancellation and thermal spreading provide measurable system-level benefits.
LTC3787EUFD#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)
LTC3787EUFD#TRPBF FAQ
1.How can I place an order for LTC3787EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787EUFD#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 LTC3787EUFD#TRPBF reliable?
The price and inventory of LTC3787EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3787EUFD#TRPBF?
LTC3787EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787EUFD#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 LTC3787EUFD#TRPBF?
For technical support, including LTC3787EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3787EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787EUFD#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 LTC3787EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787EUFD#TRPBF?
All LTC3787EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787EUFD#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 LTC3787EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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