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Analog Devices Inc. LTC3784EGN#PBF
- Part No.:
- LTC3784EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784EGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:503
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Product details
Overview
LTC3784EGN#PBF 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 to 60V input (down to 2.3V after 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#PBF datasheet, LTC3784EGN#PBF pinout, LTC3784EGN#PBF application, or LTC3784EGN#PBF equivalent, key selection criteria include its dual-phase synchronous control architecture, programmable 50kHz–900kHz switching frequency, low 28μA quiescent current, phase-lockable PLL interface, and thermally enhanced 28-pin SSOP package with –40°C to 125°C operation.
Technical Context
The LTC3784EGN#PBF implements constant-frequency current-mode control with two independent out-of-phase channels, each using an internal error amplifier (transconductance = 2 mmho) and peak-current sensing via SENSE1+/– and SENSE2+/– pins. Its dual-stage architecture enables 2-, 3-, 4-, 6-, or 12-phase configurations through daisy-chained CLKOUT and PHASMD pin programming.
It integrates a 5.4V internal LDO (INTVCC) powered either from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), supports Burst Mode®, pulse-skipping, or forced continuous operation via PLLIN/MODE pin logic, and includes overvoltage protection (OVMODE-selectable), power-good monitoring (PGOOD), and soft-start ramping via SS pin capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V (65V abs max); operates down to 2.3V after startup when VBIAS is powered from VOUT - enables wide battery and industrial supply compatibility. |
| Output Voltage Range | Up to 60V - supports high-voltage boost applications such as LED drivers and industrial power rails. |
| Reference Voltage Accuracy | ±1% at 1.200V (1.188V–1.212V) - ensures precise output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - critical for always-on or energy-sensitive systems. |
| Switching Frequency Range | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz - balances efficiency, EMI, and magnetics size. |
| Current Sense Threshold | Selectable 42mV/68mV/90mV via ILIM pin (GND/floating/INTVCC) - enables flexible RSENSE or DCR sensing with matched channel accuracy (±12mV). |
| Package | 28-lead plastic SSOP (GN), θJA = 80°C/W - standard surface-mount footprint with verified thermal performance for industrial PCB layouts. |
Pinout & Package
28-lead plastic SSOP (GN) package with exposed pad not present - designed for standard reflow assembly and thermal management via PCB copper area under body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or INTVCC/GND selects fixed frequencies - enables precise EMI tuning and layout optimization. |
| PLLIN/MODE (Pin 4) | External sync input / light-load mode selector | Accepts external clock for phase-locking; configures Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC) - adapts efficiency behavior to dynamic load profiles. |
| SENSE1+/–, SENSE2+/– (Pins 2,3,11,28) | Dual-channel current sense inputs | Support RSENSE or inductor DCR sensing with 2.3V–60V common-mode range - enables accurate per-phase current limiting and balanced multiphase operation. |
| TG1/TG2 (Pins 17,26) | Top gate drive outputs | Drive synchronous N-MOSFET gates with 1.2Ω pull-up/down and 20ns rise/fall - ensures fast, low-loss switching with minimal shoot-through risk. |
| BG1/BG2 (Pins 19,24) | Bottom gate drive outputs | Drive main N-MOSFET gates with same drive strength and timing as TG pins - maintains symmetrical channel timing for optimal phase interleaving. |
| VFB (Pin 13) | Error amplifier feedback input | Compares remote output voltage against 1.200V reference; ±50nA input bias - allows high-impedance resistive divider without gain error. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% for ≥45μs - provides reliable system-level power sequencing and fault signaling. |
| RUN (Pin 9) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; 4.5μA sourced current enables resistor-divider hysteresis - supports controlled start-up and brown-out recovery. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel control | Enables 2-phase interleaved operation reducing input/output ripple by ~70% vs single-phase - cuts capacitor count and EMI filter size. |
| Synchronous rectification support | Drives both top and bottom N-MOSFETs with matched gate timing and 100% duty cycle capability - eliminates diode losses and improves full-load efficiency >95%. |
| Flexible current sensing | Configurable 42/68/90mV thresholds via ILIM pin and dual SENSE+/- pairs - accommodates low-value sense resistors or DCR-based lossless sensing. |
| Low IQ and shutdown modes | 28μA operating IQ and <4μA shutdown current - extends battery life in portable or backup power systems. |
| Thermally optimized SSOP package | 28-pin GN package with θJA = 80°C/W - delivers proven thermal performance in convection-cooled industrial environments without heatsinks. |
Applications
| Industrial Power Supply | Automotive DC-DC Boost |
|---|---|
Use Scenario: 12V vehicle battery powering 24V auxiliary systems (e.g., camera modules, radar units) in commercial vehicles. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing interleaved switching, current sharing, and OVP response. Use Value: Reduces input capacitor requirements by 50% and lowers thermal stress on MOSFETs versus single-phase designs - improves reliability in under-hood environments. |
Use Scenario: Upgrading legacy 12V automotive infotainment head units to support 24V display backlights and USB-C PD ports. IC Role / Device Role / Timing Role: High-efficiency boost controller with Burst Mode® for ultra-low standby power and fast transient response during ignition cycles. Use Value: Achieves >92% efficiency at 100mA load and <4μA shutdown current - meets OEM cold-cranking and parking-mode current budgets. |
| Medical Imaging Power | Military Portable Equipment |
Use Scenario: Portable X-ray generator requiring stable 60V output from 24V Li-ion battery pack with strict EMI limits. IC Role / Device Role / Timing Role: Phase-locked PolyPhase® controller synchronized to system clock to suppress switching noise in analog signal chains. Use Value: Enables deterministic 75kHz–850kHz synchronization - eliminates beat frequencies and simplifies EMI compliance testing. |
Use Scenario: Ruggedized handheld radio operating from 18–36V military battery, needing 28V regulated rail with extended temperature support. IC Role / Device Role / Timing Role: Wide-input boost controller rated for –40°C to 125°C junction, with robust UVLO (3.6V/3.8V) and overvoltage protection. Use Value: Guaranteed operation across full military temp range without derating - eliminates need for external thermal monitoring circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3784EUFD#PBF | Same die, 4mm × 5mm QFN package (θJA = 43°C/W), identical electrical specs and pinout mapping. | Better thermal performance in space-constrained layouts; requires different land pattern and reflow profile. | Select when board real estate or thermal resistance is critical; verify PCB stack-up and solder mask clearance for exposed pad. |
| LTC3781EGN#PBF | Single-phase version, same 28-pin SSOP package, 4.5V–60V input, but no PolyPhase® or second channel - lacks CLKOUT, PHASMD, SENSE2, TG2/BG2/BOOST2 pins. | Lower cost and simpler design for <10A applications; cannot scale to multiphase for higher power. | Choose only for lower-power boost needs where interleaving benefits are unnecessary; not a drop-in replacement. |
Compared with LTC3784EUFD#PBF, the LTC3784EGN#PBF trades thermal performance for established SSOP assembly infrastructure; compared with LTC3781EGN#PBF, it adds dual-phase control and scalability at higher component count and layout complexity.
Availability
LTC3784EGN#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC conversion, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3784EGN#PBF 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 full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC3784 series.
The LTC3784EGN#PBF belongs to Linear's high-voltage PolyPhase® controller family, engineered specifically for high-efficiency, multi-phase synchronous boost conversion in demanding industrial and automotive environments.
FAQ
What is the maximum input voltage rating for the LTC3784EGN#PBF?
The LTC3784EGN#PBF has an absolute maximum input voltage of 65V on VBIAS, with recommended operating range of 4.5V to 60V. After startup, it can operate down to 2.3V if VBIAS is powered from the output rail - enabling brownout resilience in battery-powered systems where input sags during peak load.
Does the LTC3784EGN#PBF support phase interleaving with other controllers?
Yes, the LTC3784EGN#PBF supports daisy-chained PolyPhase® operation via its CLKOUT pin and PHASMD pin configuration. When multiple LTC3784EGN#PBF devices are connected, CLKOUT from one drives PLLIN/MODE of the next, enabling precise 180° (2-phase), 120° (3-phase), or custom phase offsets without external timing components.
How does the ILIM pin affect current sensing on the LTC3784EGN#PBF?
The ILIM pin on the LTC3784EGN#PBF selects the peak current sense threshold: grounded = 42mV, floating = 68mV, tied to INTVCC = 90mV. This directly sets the trip point for both SENSE1 and SENSE2 comparators, allowing optimization for RSENSE value or DCR coefficient while maintaining matched channel accuracy within ±12mV.
Can the LTC3784EGN#PBF operate without an external oscillator or clock source?
Yes, the LTC3784EGN#PBF operates autonomously using its internal VCO. The FREQ pin can be tied to GND (350kHz), INTVCC (535kHz), or a resistor-to-GND to set any frequency from 50kHz to 900kHz - eliminating need for external clock sources unless phase synchronization across multiple converters is required.
What thermal considerations apply to the LTC3784EGN#PBF in SSOP package?
The LTC3784EGN#PBF in 28-pin SSOP (GN) package has a junction-to-ambient thermal resistance (θJA) of 80°C/W under standard JEDEC conditions. To maintain ≤125°C junction temperature at full load, ambient must stay ≤85°C with adequate PCB copper area (≥2 in²) connected to PGND and VBIAS traces - no exposed pad required unlike QFN variants.
LTC3784EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3784EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784EGN#PBF 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#PBF reliable?
The price and inventory of LTC3784EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784EGN#PBF?
LTC3784EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784EGN#PBF 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#PBF?
For technical support, including LTC3784EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784EGN#PBF requirements.
6.How does Aetrix verify that LTC3784EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784EGN#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784EGN#PBF?
All LTC3784EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784EGN#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3784EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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