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Analog Devices Inc. LTC3784IGN#TRPBF
- Part No.:
- LTC3784IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
LTC3784IGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance PolyPhase® 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–60V input (down to 2.3V post-startup), delivers up to 60V output, features ±1% 1.200V reference, RSENSE/DCR current sensing, and 100% duty cycle capability - used in industrial 24V-to-48V telecom power supplies.
For engineers reviewing the LTC3784IGN#TRPBF datasheet, LTC3784IGN#TRPBF pinout, LTC3784IGN#TRPBF application, or LTC3784IGN#TRPBF equivalent, key selection criteria include its 2-phase PolyPhase operation, programmable 50kHz–900kHz switching frequency, low 28μA quiescent current, phase-lockable PLL interface, and dual-current-sense architecture for high-efficiency boost conversion in space-constrained industrial and automotive systems.
Technical Context
The LTC3784IGN#TRPBF implements constant-frequency current-mode control with two independent, out-of-phase channels. Each channel uses peak current limiting via ITH voltage feedback and reverse-current detection (IREV) to terminate top-FET conduction, enabling precise regulation across wide VIN/VOUT ratios.
Its dual-stage architecture supports 2-, 3-, 4-, 6-, and 12-phase configurations via CLKOUT daisy-chaining and PHASMD pin programming. The internal 5.4V LDO powers gate drivers from either VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with automatic switchover at 4.8V and thermal derating for SSOP package (θJA = 80°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 60V input; operates down to 2.3V after startup when VBIAS is powered from VOUT - enables battery-backed or wide-input industrial systems. |
| VOUT Max | 60V regulated output - supports high-voltage LED drivers, telecom DC-DC stages, and industrial sensor excitation. |
| Reference Voltage | ±1% accuracy at 1.200V - ensures tight output regulation over temperature and line/load conditions. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode - extends runtime in always-on industrial monitoring systems. |
| Switching Frequency | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - balances efficiency, EMI, and magnetics size in compact designs. |
| Current Sensing | RSENSE or inductor DCR sensing with selectable 42mV/68mV/90mV thresholds via ILIM pin - enables flexible loss vs. noise trade-offs. |
| Duty Cycle | 100% capability for synchronous MOSFET - maintains regulation during deep dropout (e.g., 12V→24V at high load). |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), thermally enhanced, rated for –40°C to 125°C operating junction temperature (θJA = 80°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz fixed frequency; DC voltage or external clock enables fine tuning or synchronization. |
| PLLIN/MODE | Light-load mode & PLL sync input | Selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC−1.3V), or forced continuous (INTVCC); enables external clock lock for EMI reduction. |
| SENSE1+/SENSE1− SENSE2+/SENSE2− | Dual differential current sense inputs | Supports independent per-phase current monitoring with 2.3V–60V common-mode range - critical for balanced PolyPhase operation. |
| TG1/TG2 BG1/BG2 | Top/bottom gate drive outputs | Drive synchronous N-MOSFETs with 1.2Ω pull-up/pull-down and <30ns dead-time - ensures efficient zero-voltage switching transitions. |
| VFB | Feedback voltage input | Compares output divider voltage against 1.200V reference; ±5nA input bias minimizes divider error in precision applications. |
| PGOOD | Open-drain power-good indicator | Asserts low when VFB deviates >±10% for ≥45μs - provides reliable system-level fault signaling without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® operation | Reduces input/output capacitor requirements by up to 50% and lowers RMS inductor current - enables smaller, cooler 24V→48V telecom boost converters. |
| Synchronous rectification | Eliminates external Schottky losses, increasing efficiency >95% at 10A (12V→24V) and reducing thermal design burden in enclosed enclosures. |
| Wide VIN with ultra-low IQ | 28μA operating current and 4μA shutdown enable direct connection to 12V vehicle batteries or industrial 24V rails without auxiliary LDOs. |
| Flexible current sensing | Configurable 42/68/90mV current limit thresholds via ILIM pin - accommodates 1mΩ–10mΩ sense resistors or DCR-based sensing for cost/PCB area optimization. |
| Thermally robust SSOP | Exposed pad not present, but 80°C/W θJA allows 1.5W dissipation at 75°C ambient - suitable for convection-cooled industrial power modules. |
Applications
| Industrial Telecom Power | Automotive 12V-to-48V Conversion |
|---|---|
Use Scenario: Boosting 24V DC distribution bus to 48V for PoE++ switches and remote radio units in outdoor cabinets. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing interleaved switching to minimize input ripple and EMI filter size. Use Value: PolyPhase operation cuts required input capacitance by 40% versus single-phase, reducing board area and improving reliability under thermal cycling. | Use Scenario: Generating stable 48V rail from vehicle 12V battery for ADAS camera modules and radar processors. IC Role / Device Role / Timing Role: High-efficiency boost controller with 2.3V startup capability and 100% duty cycle - sustains output during cold-crank events down to 6V battery. Use Value: 28μA quiescent current prevents parasitic drain on starter battery during extended parking; PGOOD enables safe processor wake-up sequencing. |
| Medical Imaging Power Supply | Military Portable Equipment |
Use Scenario: Providing isolated 60V bias for X-ray detector sensor arrays requiring ultra-low noise and tight regulation. IC Role / Device Role / Timing Role: Precision 1.200V reference and ±1% FB accuracy ensure consistent sensor bias across temperature; RSENSE/DCR flexibility supports low-noise layouts. Use Value: Low 45μs PGOOD delay and ±10% trip threshold enable rapid fault isolation in safety-critical imaging chains without false triggers. | Use Scenario: Compact 28-pin SSOP boost stage in handheld radios converting 14.4V Li-ion to 28V RF amplifier supply. IC Role / Device Role / Timing Role: Military-grade (-40°C to 125°C) PolyPhase controller with phase-lockable frequency for synchronized multi-rail EMI management. Use Value: PHASMD pin configuration enables deterministic 180° phase shift between channels - suppresses conducted emissions in narrow-band military comms bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3784IUFD#TRPBF | Same die, 28-pin 4mm×5mm QFN package with θJA = 43°C/W - lower thermal resistance but requires different PCB land pattern. | Preferred for high-power density designs where board space is constrained and forced-air cooling is unavailable. | Select when thermal performance is prioritized over legacy SSOP footprint compatibility. |
| LT8337EDD#TRPBF | Single-phase 60V boost controller with integrated 2.5A MOSFETs; no PolyPhase support; 2.5μA IQ; fixed 2MHz or syncable 1.2–2.5MHz. | Suitable for lower-current (<3A), space-limited applications where discrete FET layout complexity must be avoided. | Choose for simplified BOM and layout in sub-100W applications - not a drop-in replacement for LTC3784IGN#TRPBF's dual-phase capability. |
Compared with LTC3784IUFD#TRPBF, the LTC3784IGN#TRPBF offers identical electrical performance but higher thermal resistance due to SSOP packaging - making it preferable for cost-sensitive, medium-power industrial systems with adequate airflow. Versus LT8337EDD#TRPBF, the LTC3784IGN#TRPBF delivers scalable multi-phase power and higher peak current handling, at the expense of integration and ultra-low IQ.
Availability
LTC3784IGN#TRPBF is available at Aetrix Electronics and suitable for industrial telecom power, automotive 12V-to-48V conversion, medical imaging bias supplies, and military portable equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3784IGN#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-reliability analog IC portfolio, emphasizing precision power management, signal conditioning, and timing solutions for demanding environments.
The LTC3784IGN#TRPBF belongs to Linear's PolyPhase® synchronous controller family, designed specifically for high-efficiency, low-noise, multi-phase DC-DC boost conversion in industrial, automotive, and medical systems where input voltage range, thermal robustness, and EMI control are critical.
FAQ
What is the minimum input voltage for LTC3784IGN#TRPBF after startup?
The LTC3784IGN#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output rail (e.g., VOUT). This enables sustained regulation during brownout conditions in automotive or battery-powered systems. Startup itself still requires ≥4.5V on VBIAS unless an auxiliary supply is used. The 2.3V capability is confirmed in the Electrical Characteristics table under "SENSE Pins Common Mode Range".
Does LTC3784IGN#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3784IGN#TRPBF supports both methods. Its SENSE+ and SENSE− pins accept differential signals from either a discrete sense resistor or the voltage drop across inductor DCR. The ILIM pin selects full-scale thresholds of 42mV, 68mV, or 90mV - allowing optimization for accuracy (RSENSE) or cost/PCB area (DCR). This dual-mode capability is explicitly documented in the Features and Pin Functions sections.
What package type and temperature grade does LTC3784IGN#TRPBF use?
The LTC3784IGN#TRPBF uses a 28-lead plastic SSOP (GN) package and is rated for –40°C to 125°C operating junction temperature. This is confirmed in the Order Information table, where "LTC3784IGN#TRPBF" maps to "28-Lead Plastic SSOP" and "I" grade. The SSOP variant has θJA = 80°C/W, distinguishing it from the QFN (UFD) version's 43°C/W.
How does the PGOOD output of LTC3784IGN#TRPBF behave during overvoltage events?
The PGOOD output of LTC3784IGN#TRPBF goes low when VFB deviates more than ±10% from the 1.200V reference for ≥45μs. During overvoltage, PGOOD asserts low independently of OVMODE pin state - however, OVMODE determines whether TG1/TG2 are forced on (OVMODE = GND) or follow normal control (OVMODE = INTVCC). This behavior is specified in the Electrical Characteristics table under "PGOOD Trip Level" and "PGOOD Delay".
Can LTC3784IGN#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3784IGN#TRPBF supports external synchronization via the PLLIN/MODE pin. When driven by an external clock, it locks the rising edge of BG1 to the external clock's rising edge across a 75kHz to 850kHz range. This is verified in the Electrical Characteristics table under "Synchronizable Frequency" and the Pin Functions description for PLLIN/MODE. No additional components are required beyond AC-coupling if DC levels differ.
LTC3784IGN#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 ~ 60V
- 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
LTC3784IGN#TRPBF FAQ
1.How can I place an order for LTC3784IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784IGN#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 LTC3784IGN#TRPBF reliable?
The price and inventory of LTC3784IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784IGN#TRPBF?
LTC3784IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784IGN#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 LTC3784IGN#TRPBF?
For technical support, including LTC3784IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3784IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784IGN#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 LTC3784IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784IGN#TRPBF?
All LTC3784IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784IGN#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 LTC3784IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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