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Analog Devices Inc. LTC3787EGN#TRPBF
- Part No.:
- LTC3787EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3787EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,370
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Product details
Overview
LTC3787EGN#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 supports 4.5V–38V input, up to 60V output, ±1% 1.200V reference, and operates down to 2.5V after start-up - ideal for high-power industrial DC-DC boost conversion in battery-powered or wide-input systems.
For engineers reviewing the LTC3787EGN#TRPBF datasheet, LTC3787EGN#TRPBF pinout, LTC3787EGN#TRPBF application, or LTC3787EGN#TRPBF equivalent, key selection criteria include phase-lockable frequency (75–850 kHz), RSENSE/DCR current sensing, 100% duty cycle capability, low 135μA quiescent current, and thermally enhanced 28-pin SSOP package with –40°C to 125°C operation.
Technical Context
The LTC3787EGN#TRPBF implements constant-frequency current-mode control with two independent, out-of-phase channels using external N-MOSFETs. Its error amplifier compares VFB against a precise 1.200V reference, modulating ITH voltage to regulate peak inductor current per phase. The internal 5.4V LDO (INTVCC) powers gate drivers and logic, optionally bypassed via EXTVCC ≥4.8V to reduce thermal load.
Phase relationship between BG1/BG2 and CLKOUT is programmable via PHASMD; PLLIN/MODE selects Burst Mode®, pulse-skipping, or forced continuous conduction at light loads. Current sensing supports both sense-resistor (RSENSE) and inductor DCR configurations, with matched ±12mV VSENSE threshold matching across channels and 2.5V–38V common-mode range on SENSE+/- pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V (abs max 40V); operates down to 2.5V after start-up - enables compatibility with 12V/24V industrial buses and Li-ion/LiFePO₄ battery stacks. |
| Output Voltage Range | Up to 60V - supports high-voltage rail generation for LED drivers, industrial sensors, and telecom interfaces. |
| Reference Voltage Accuracy | ±1% at 1.200V - ensures tight output regulation over temperature and line/load variations. |
| Quiescent Current | 135μA in pulse-skipping/forced continuous mode - extends battery life in always-on systems. |
| Switching Frequency Range | 50kHz to 900kHz programmable; 75kHz to 850kHz phase-lockable - allows EMI optimization and inductor size reduction. |
| Current Sense Threshold | 42mV/68mV/90mV selectable via ILIM pin (GND/float/INTVCC) - enables flexible trade-off between sensing accuracy and power loss in RSENSE or DCR designs. |
| Shutdown Current | <8μA - minimizes standby drain in safety-critical or energy-harvesting applications. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), thermally enhanced with θJA = 90°C/W; operating junction temperature range –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50–900kHz; direct DC voltage or tie to INTVCC/GND for fixed frequencies - enables precise EMI tuning and layout-driven frequency selection. |
| PLLIN/MODE (Pin 4) | Light-load mode & sync input | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock = synchronization - critical for efficiency vs. noise trade-offs in variable-load systems. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense inputs | Accept 2.5V–38V common-mode voltage; support RSENSE or DCR sensing - allows placement at input side of boost stage without level-shifting. |
| VFB (Pin 10) | Error amplifier feedback input | Compares remote output voltage (via resistor divider) to 1.200V reference - enables accurate regulation despite PCB trace IR drop. |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Voltage sets peak inductor current per phase; compensation network connects here - central node for loop stability and current limiting design. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VOUT deviates >±10% for ≥25μs - provides system-level fault signaling for sequencers or microcontrollers. |
| ILIM (Pin 26) | Current sense threshold select | GND/float/INTVCC configures 50mV/75mV/100mV trip point - matches sense element value and optimizes SNR vs. conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase PolyPhase® operation | Reduces RMS input/output capacitor currents by ~70% vs. single-phase, enabling smaller bulk capacitors and lower EMI filter cost. |
| Synchronous rectification | Eliminates external Schottky diode losses, increasing full-load efficiency by 3–5% and reducing thermal stress on main MOSFETs. |
| 100% duty cycle capability | Allows seamless transition to dropout conditions (e.g., VIN ≈ VOUT), maintaining regulation during brownouts or cold cranking. |
| Internal 5.4V LDO with EXTVCC switchover | Reduces power dissipation by bypassing VBIAS LDO when external 5V rail is available - improves thermal margin in high-current designs. |
| Programmable soft-start via SS pin | 10μA internal current charges external capacitor, linearly ramping VOUT - prevents inrush current and output overshoot during power-up. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Supplies |
|---|---|
Use Scenario: Boosting 12V vehicle battery to 24V/48V for radar modules and camera ISPs under cold-crank transients. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating high-current output while maintaining operation down to 2.5V input during engine start. Use Value: Enables reliable power delivery during 12V bus dips; phase interleaving reduces input ripple current, easing EMI filtering requirements for ISO 11452-2 compliance. | Use Scenario: Generating stable 36V rail from 12V automotive battery for high-brightness LED headlights with PWM dimming. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering up to 10A with Burst Mode® operation to maintain >90% efficiency at 100mA standby load. Use Value: Low 135μA quiescent current extends battery life during parking mode; ±1% reference ensures consistent LED brightness across temperature. |
| Medical Portable Imaging Systems | Military Communications Radios |
Use Scenario: Providing regulated 48V/3A output from 14.4V Li-ion battery pack for portable X-ray detector bias supplies. IC Role / Device Role / Timing Role: Wide-input boost controller supporting 4.5V–38V operation with programmable frequency to avoid sensitive RF bands. Use Value: Phase-lockable oscillator allows synchronization to system clock, eliminating beat frequencies that could interfere with image sensor readout timing. | Use Scenario: Generating 28V/5A from 24V MIL-STD-704E aircraft bus for HF transceiver PA stages requiring low-noise, high-reliability power. IC Role / Device Role / Timing Role: Dual-phase controller with –40°C to 125°C rated SSOP package and robust current sensing for harsh-environment deployment. Use Value: Matched VSENSE thresholds (±12mV) ensure balanced phase current sharing; 40V abs max ratings withstand load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781EGN#TRPBF | Single-phase, same pinout but no CLKOUT/PHASMD; 50kHz–900kHz freq; 135μA IQ; 4.5V–38V VIN | Lacks multiphase capability and synchronization features - suitable only for lower-power (<5A) or space-constrained designs where interleaving is unnecessary. | Select when phase count and daisy-chaining are not required; saves board area and BOM cost for simpler boost needs. |
| LM5122MMX/NOPB | Single-phase controller; 3V–65V VIN; 100kHz–1MHz freq; 100μA IQ; integrated gate drivers; no DCR sensing | Higher input voltage range and lower quiescent current, but lacks PolyPhase® architecture, phase sync, and DCR current sensing support. | Prefer for ultra-wide input (e.g., 3–65V) or where integrated drivers simplify layout; avoid when interleaved current sharing or DCR sensing is mandatory. |
Compared with LTC3781EGN#TRPBF and LM5122MMX/NOPB, the LTC3787EGN#TRPBF uniquely delivers dual-phase interleaving, programmable phase offset, and robust DCR/RSENSE flexibility - essential for high-current, low-EMI, and thermally constrained industrial and automotive boost converters.
Availability
LTC3787EGN#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS subsystems, medical imaging equipment, and military communications radios requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LTC3787EGN#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 legacy of high-performance analog and power management ICs with rigorous automotive, industrial, and military qualification standards.
The LTC3787EGN#TRPBF belongs to Linear's PolyPhase® synchronous controller product line, designed specifically for high-efficiency, high-current DC-DC boost conversion where input/output ripple reduction, thermal management, and EMI control are critical.
FAQ
What is the maximum output voltage supported by the LTC3787EGN#TRPBF?
The LTC3787EGN#TRPBF supports output voltages up to 60V. This is enabled by its high-voltage gate driver architecture and 76V absolute maximum rating on BOOST1/BOOST2 pins. The actual achievable output depends on external MOSFET voltage ratings, inductor saturation current, and output capacitor voltage derating - but the controller itself regulates stably within this 60V ceiling.
Does the LTC3787EGN#TRPBF support inductor DCR current sensing?
Yes, the LTC3787EGN#TRPBF explicitly supports both RSENSE and inductor DCR current sensing. Its SENSE+/- pins feature a 2.5V–38V common-mode range and internal filtering optimized for DCR-based sensing, eliminating the need for external amplifiers or RC networks in many designs. The ILIM pin selects full-scale sense thresholds compatible with typical DCR values.
What package type and temperature grade does the LTC3787EGN#TRPBF use?
The LTC3787EGN#TRPBF uses a 28-lead plastic SSOP (GN) package and is rated for operation from –40°C to +125°C junction temperature. This industrial-grade temperature range, combined with its exposed-pad-compatible SSOP thermal design, makes it suitable for demanding environments including automotive under-hood and industrial control cabinets.
How does the LTC3787EGN#TRPBF achieve low quiescent current in light-load conditions?
The LTC3787EGN#TRPBF achieves 135μA quiescent current in pulse-skipping or forced continuous mode, and <8μA in shutdown, via adaptive circuitry that disables non-essential blocks during low-power states. In Burst Mode®, internal sleep logic turns off gate drivers and oscillator sections between bursts, while retaining fast wake-up response - all without compromising regulation accuracy or transient performance.
Can the LTC3787EGN#TRPBF be synchronized to an external clock source?
Yes, the LTC3787EGN#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–850kHz) is applied, its internal phase-locked loop locks the rising edge of BG1 to the external clock's rising edge. This enables deterministic timing across multiple converters in stacked or parallel power systems, reducing beat frequencies and simplifying EMI filter design.
LTC3787EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3787EGN#TRPBF FAQ
1.How can I place an order for LTC3787EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3787EGN#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 LTC3787EGN#TRPBF reliable?
The price and inventory of LTC3787EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3787EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3787EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3787EGN#TRPBF transactions.
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4.How is shipping managed for LTC3787EGN#TRPBF?
LTC3787EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3787EGN#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 LTC3787EGN#TRPBF?
For technical support, including LTC3787EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3787EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3787EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3787EGN#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 LTC3787EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3787EGN#TRPBF?
All LTC3787EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3787EGN#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 LTC3787EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3787EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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