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Analog Devices Inc. LTC3784EGN#TRPBF
- Part No.:
- LTC3784EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,267
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Product details
Overview
LTC3784EGN#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 12V-to-24V/10A 2-phase boost converters.
For engineers reviewing the LTC3784EGN#TRPBF datasheet, LTC3784EGN#TRPBF pinout, LTC3784EGN#TRPBF application, or LTC3784EGN#TRPBF equivalent, key selection criteria include wide VIN range (4.5V–60V), phase-lockable frequency (75kHz–850kHz), programmable fixed frequency (50kHz–900kHz), low quiescent current (28μA), and dual-channel gate drive with independent SENSE+/– inputs for precision current monitoring.
Technical Context
The LTC3784EGN#TRPBF implements constant-frequency current-mode control with two independent out-of-phase channels, each using an error amplifier (EA) comparing VFB to a 1.200V reference and generating ITH to set peak inductor current. Its dual-stage architecture supports 2-, 3-, 4-, 6-, and 12-phase configurations via CLKOUT daisy-chaining and PHASMD pin programming.
It integrates a 5.4V internal LDO (INTVCC) powered from VBIAS or EXTVCC (switchover at 4.8V), thermally enhanced 28-pin SSOP package (θJA = 80°C/W), and robust protection including overvoltage mode selection (OVMODE), power-good monitoring (PGOOD), and UVLO on INTVCC (3.6V rising, 3.8V falling).
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 | Up to 60V regulated output - supports high-voltage LED drivers, telecom power, and industrial bus supplies. |
| Reference Voltage | ±1% accurate 1.200V internal reference - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping or forced continuous mode - extends runtime in always-on industrial sensors. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - balances efficiency, size, and EMI in space-constrained designs. |
| Current Sensing | RSENSE or inductor DCR sensing with ±12mV matching between channels - enables precise per-phase current balancing in PolyPhase operation. |
| Gate Drive | Two independent top/bottom gate drivers with 1.2Ω pull-up/pull-down and 30ns switch-on delay - ensures fast, low-loss MOSFET switching with controlled shoot-through prevention. |
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 (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or external clock also accepted - enables flexible frequency tuning and synchronization. |
| PLLIN/MODE (Pin 4) | Light-load mode & external sync input | Selects Burst Mode®, pulse-skipping, or forced continuous; accepts external clock for phase-locking - critical for EMI-sensitive or multi-controller systems. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense differential input | Supports RSENSE or DCR sensing with 2.3V–60V common-mode range - allows placement at input or output side of inductor. |
| VFB (Pin 10) | Error amplifier feedback input | Compares remote-sensed output voltage to 1.200V reference - enables precision regulation with external resistor divider. |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Sets peak inductor current per channel; voltage directly controls current trip point - core of current-mode loop stability. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% for ≥45μs - provides system-level fault signaling without external logic. |
| ILIM (Pin 26) | Peak current sense voltage select | GND/float/INTVCC sets VSENSE threshold to 50/75/100mV - simplifies current limit calibration across variants. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® operation | Reduces required input/output capacitance by up to 75% and lowers RMS current stress in magnetics versus single-phase - cuts BOM cost and board area. |
| Synchronous rectification | Drives both top and bottom N-MOSFETs per phase - eliminates body-diode conduction losses, enabling >95% efficiency at full load. |
| 100% duty cycle capability | Enables boost operation with VIN close to VOUT (e.g., 24V→24.5V) - supports hold-up, battery backup, and seamless switchover applications. |
| Low shutdown current | IQ < 4µA when RUN < 0.7V - preserves battery life in standby modes for portable or remote industrial equipment. |
| Thermally enhanced SSOP | 28-pin GN package with optimized thermal pad layout - sustains 125°C ambient operation without heatsink in 24W+ boost designs. |
Applications
| Industrial Power Supplies | Automotive DC-DC Conversion |
|---|---|
Use Scenario: 12V vehicle battery powering 24V/10A auxiliary systems (e.g., ADAS cameras, infotainment displays). IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating output while rejecting engine cranking transients. Use Value: PolyPhase operation reduces input ripple current by 50%, minimizing bulk capacitor size and extending lifetime under high-temp under-hood conditions. | Use Scenario: Boosting 12V starter battery to 48V for mild-hybrid motor control during regenerative braking. IC Role / Device Role / Timing Role: High-efficiency, high-reliability boost controller managing bidirectional energy flow with precise current limiting. Use Value: RSENSE/DCR sensing + ±12mV inter-channel matching ensures balanced phase current sharing, preventing MOSFET thermal runaway. |
| Medical Imaging Power | Military Portable Radios |
Use Scenario: Generating stable 60V bias for X-ray detector arrays from 24V nominal input with strict EMI limits. IC Role / Device Role / Timing Role: Phase-lockable boost controller synchronized to system clock to avoid spectral interference in sensitive analog front-ends. Use Value: 75kHz–850kHz PLL range enables deterministic noise placement outside imaging bandwidth, eliminating image artifacts. | Use Scenario: Compact 28V-to-48V boost converter in manpack radios requiring MIL-STD-810G shock/vibe tolerance and extended battery life. IC Role / Device Role / Timing Role: Low-quiescent-current (28μA) boost controller supporting burst-mode operation during receive intervals. Use Value: 4μA shutdown current extends shelf life of sealed battery packs; SS pin soft-start prevents inrush-induced voltage droop on shared power rails. |
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 functionality and pinout; QFN package (4mm × 5mm), θJA = 43°C/W vs SSOP's 80°C/W - higher thermal performance. | Better suited for high-power density or convection-cooled PCBs where thermal resistance must be minimized. | Select when board space is constrained and thermal management prioritizes low θJA over legacy SSOP footprint compatibility. |
| LTC3784HUFD#TRPBF | Same silicon; extended temperature grade (–40°C to 150°C) and QFN package - qualified for under-hood automotive or avionics use. | Required for applications exceeding 125°C ambient, such as engine control modules or airborne power systems. | Choose only when full military or AEC-Q200-grade operation is mandated - not needed for standard industrial environments. |
Compared with LTC3784EGN#TRPBF, the IUFD variant offers superior thermal dissipation in compact layouts, while the HUFD variant adds extended temperature qualification - neither provides pin-compatible drop-in replacement for GN-package designs without PCB revision.
Availability
LTC3784EGN#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC conversion, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3784EGN#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 power management portfolio with rigorous testing and reliability standards.
The LTC3784 belongs to Linear's PolyPhase® synchronous controller family, designed specifically for high-efficiency, multi-phase DC-DC boost conversion in industrial, automotive, and medical systems demanding low noise and precise regulation.
FAQ
What is the minimum input voltage for LTC3784EGN#TRPBF after startup?
The LTC3784EGN#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output (VOUT) or another auxiliary supply. This enables brownout recovery and operation from partially discharged batteries. The absolute minimum VIN before startup remains 4.5V, as specified in the Absolute Maximum Ratings table.
How does the ILIM pin affect current sensing in LTC3784EGN#TRPBF?
The ILIM pin on the LTC3784EGN#TRPBF selects the peak current sense threshold: grounding sets it to 50mV, floating to 75mV, and connecting to INTVCC to 100mV. This directly configures the VSENSE1/2(MAX) value used by the current comparators, allowing hardware-based current limit adjustment without changing external sense resistors.
Can LTC3784EGN#TRPBF synchronize to an external clock, and what pins are involved?
Yes, the LTC3784EGN#TRPBF supports external clock synchronization via the PLLIN/MODE pin (Pin 4). When an external clock is applied, the internal PLL locks the rising edge of BG1 to that clock. The OVMODE pin (Pin 12) then determines light-load behavior during sync - grounded for forced continuous mode, tied to INTVCC for pulse-skipping mode.
What is the purpose of the SS pin on LTC3784EGN#TRPBF, and how is it configured?
The SS (soft-start) pin on the LTC3784EGN#TRPBF controls output voltage ramp rate during startup. An external capacitor from SS to SGND is charged by an internal 10μA current source, creating a linear voltage ramp. As SS rises from 0V to 1.2V, the regulator servo targets SS instead of the internal reference - ensuring controlled, inrush-limited start-up.
Does LTC3784EGN#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3784EGN#TRPBF supports both RSENSE and inductor DCR current sensing through dedicated SENSE1+/– and SENSE2+/– differential inputs. The common-mode voltage range is 2.3V to 60V, and the IC includes internal filtering and offset compensation to maintain accuracy with either method - enabling flexibility in layout and cost optimization.
LTC3784EGN#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
LTC3784EGN#TRPBF FAQ
1.How can I place an order for LTC3784EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784EGN#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 LTC3784EGN#TRPBF reliable?
The price and inventory of LTC3784EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784EGN#TRPBF?
LTC3784EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784EGN#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 LTC3784EGN#TRPBF?
For technical support, including LTC3784EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3784EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784EGN#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 LTC3784EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784EGN#TRPBF?
All LTC3784EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784EGN#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 LTC3784EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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