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Analog Devices Inc. LTC3784HGN#PBF
- Part No.:
- LTC3784HGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784HGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
LTC3784HGN#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–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 LTC3784HGN#PBF datasheet, LTC3784HGN#PBF pinout, LTC3784HGN#PBF application, or LTC3784HGN#PBF equivalent, key selection criteria include its –40°C to 150°C extended temperature rating, dual-phase operation for thermal distribution, programmable 50kHz–900kHz switching frequency, and integrated 5.4V INTVCC LDO powered from VBIAS or EXTVCC.
Technical Context
The LTC3784HGN#PBF implements constant-frequency current-mode control with two independent channels operating 180° out-of-phase. Its error amplifier compares VFB against a precision 1.200V reference, modulating ITH to regulate peak inductor current per phase. The internal VCO supports fixed-frequency programming (via FREQ pin resistor) or PLL synchronization (75kHz–850kHz) through PLLIN/MODE.
It integrates dual gate drivers with matched rise/fall times (20ns), top/bottom gate delay control (30ns), and BOOST charge pumps enabling high-side N-MOSFET drive. Overvoltage protection (OVMODE-selectable), soft-start (SS pin), and three light-load modes (Burst Mode®, pulse-skipping, forced continuous) are implemented via dedicated pins with defined voltage thresholds and hysteresis.
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 bus voltage compatibility. |
| Output Voltage Range | Up to 60V - supports high-voltage industrial and telecom applications such as 24V-to-48V boost conversion. |
| Reference Voltage | ±1% 1.200V (1.188V–1.212V) - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - critical for low-power standby operation. |
| Switching Frequency | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - allows EMI optimization and inductor size reduction. |
| Current Sensing | RSENSE or inductor DCR sensing with selectable 42mV/68mV/90mV thresholds (ILIM pin config) - supports flexible, low-loss current monitoring. |
| Operating Temperature | –40°C to +150°C junction - qualified for harsh environments including automotive under-hood and industrial motor drives. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), thermally enhanced, rated θJA = 80°C/W. Exposed pad not present (SSOP).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; GND = 350kHz, INTVCC = 535kHz - enables precise EMI tuning without external clock. |
| PLLIN/MODE (Pin 4) | Light-load mode & sync input | GND = Burst Mode®, INTVCC = forced continuous, mid-voltage = pulse-skipping; external clock syncs BG1 rising edge - selects efficiency vs. ripple trade-off. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense inputs | Accept 2.3V–60V common-mode voltage; differential threshold configurable via ILIM - supports high-side or low-side RSENSE placement. |
| VFB (Pin 10) | Feedback voltage input | Compares output divider voltage to 1.200V reference; ±5nA input bias - enables stable regulation with high-resistance dividers. |
| ITH (Pin 11) | Error amplifier output & current limit threshold | Directly sets peak inductor current; transconductance = 2mmho - forms inner current loop for fast transient response. |
| PGOOD (Pin 25) | Power-good open-drain output | Asserts low when VFB deviates >±10% for ≥45μs - provides system-level fault signaling with built-in debounce. |
| RUN (Pin 6) | Enable/shutdown control | 1.28V threshold with 100mV hysteresis; <0.7V = ultra-low-IQ shutdown (<4μA) - enables sequenced power-up and brownout protection. |
| SS (Pin 7) | Soft-start ramp control | 10μA internal pull-up charges external capacitor; regulates VFB to SS voltage until 1.2V reached - prevents inrush current and output overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces RMS input/output ripple current by ~70% vs. single-phase, allowing smaller capacitors and lower ESR requirements. |
| Synchronous rectification support | Integrated high-side gate drivers with BOOST charge pumps enable efficient N-MOSFET use - eliminates body-diode conduction losses. |
| 100% duty cycle capability | Enables dropout operation at VIN ≈ VOUT - essential for battery-powered systems transitioning between charge/discharge states. |
| Three selectable light-load modes | Burst Mode® (high efficiency at µA loads), pulse-skipping (low noise), forced continuous (lowest ripple) - user-configurable per application need. |
| Robust overvoltage protection | OVMODE-selectable: ground = active clamp (TG1/TG2 forced on), INTVCC = disable clamp - prevents damage during feedback fault conditions. |
Applications
| Industrial Telecom Power | Automotive ADAS Power |
|---|---|
Use Scenario: Boosting 24V vehicle battery to 48V for radar/LiDAR modules in ADAS systems requiring clean, regulated power under wide temperature swings. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two parallel power stages with out-of-phase switching to minimize input ripple and thermal stress. Use Value: –40°C to +150°C rating ensures reliability in engine bay mounting; 28μA quiescent current extends battery life during vehicle sleep mode. | Use Scenario: Generating stable 48V rail from 12V/24V industrial bus for PoE++ switches, optical line terminals, or remote radio units in outdoor cabinets. IC Role / Device Role / Timing Role: High-voltage PolyPhase® controller delivering up to 60V output with programmable frequency to avoid sensitive RF bands. Use Value: RSENSE/DCR sensing flexibility reduces BOM cost; EXTVCC option lowers thermal dissipation by bypassing VBIAS LDO during high-current operation. |
| Medical Imaging Supply | Military Vehicle Power |
Use Scenario: Providing tightly regulated high-voltage bias for X-ray detector arrays where output stability and low noise are critical for image fidelity. IC Role / Device Role / Timing Role: Precision 1.200V ±1% reference and low-noise current-mode control ensure sub-0.1% output regulation across load and temperature. Use Value: Soft-start (SS pin) prevents mechanical stress on piezoelectric components; PGOOD output enables system-level safety interlocks. | Use Scenario: Converting 28V aircraft/military vehicle bus to 42V for avionics subsystems requiring MIL-STD-704 compliance and extreme temperature resilience. IC Role / Device Role / Timing Role: Dual-channel controller with phase-lockable frequency (75kHz–850kHz) enables synchronization to master clock for EMI reduction in multi-rack systems. Use Value: –40°C to +150°C operation meets MIL-PRF-38535 Class H requirements; OVMODE-configurable protection handles feedback loop faults in mission-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3784HUFD#PBF | Same die, 4mm × 5mm QFN package (θJA = 43°C/W), exposed pad GND connection required | Better thermal performance for high-power density designs; requires PCB thermal pad layout | Select when board space is constrained and thermal management via PCB copper is feasible. |
| LTC3784IGD#TRPBF | Industrial-grade (–40°C to +125°C), same SSOP package, identical electrical specs | Lower temperature rating; suitable for non-extreme ambient environments | Select when full H-grade temperature range is unnecessary and cost optimization is prioritized. |
Compared with LTC3784HUFD#PBF, the LTC3784HGN#PBF offers higher thermal resistance (80°C/W vs. 43°C/W) but avoids QFN assembly complexity; compared with LTC3784IGD#TRPBF, it adds 25°C junction margin for sustained operation in sealed enclosures or high-ambient settings.
Availability
LTC3784HGN#PBF is available at Aetrix Electronics and suitable for industrial telecom power, automotive ADAS systems, medical imaging supplies, and military vehicle power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3784HGN#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 its high-performance analog IC portfolio, emphasizing precision, power efficiency, and ruggedness for demanding applications.
The LTC3784 product line delivers PolyPhase® synchronous boost controllers optimized for high-voltage, high-efficiency DC/DC conversion in industrial, automotive, and aerospace systems where thermal management and reliability are critical.
FAQ
What is the maximum input voltage the LTC3784HGN#PBF can withstand?
The LTC3784HGN#PBF has an absolute maximum VBIAS rating of 65V. Its operational input range is 4.5V to 60V, and it can sustain operation down to 2.3V after startup if VBIAS is powered from the output rail. This makes the LTC3784HGN#PBF suitable for transient-heavy 48V industrial buses and automotive cold-crank scenarios where input may dip below nominal.
How does the LTC3784HGN#PBF achieve 100% duty cycle operation?
The LTC3784HGN#PBF achieves 100% duty cycle by disabling the bottom gate driver (BG) while keeping the top gate driver (TG) active, allowing the output to track the input when VIN approaches VOUT. This behavior is inherent to its synchronous boost architecture and requires no external circuitry - enabling seamless operation during battery discharge or input voltage sags.
Can the LTC3784HGN#PBF be synchronized to an external clock?
Yes, the LTC3784HGN#PBF supports external synchronization via the PLLIN/MODE pin, accepting clocks from 75kHz to 850kHz. When an external signal is applied, the internal PLL locks the rising edge of BG1 to the external clock's rising edge, enabling deterministic timing across multiple phases or systems - critical for EMI-sensitive and multi-rail applications.
What is the purpose of the OVMODE pin on the LTC3784HGN#PBF?
The OVMODE pin on the LTC3784HGN#PBF selects overvoltage protection behavior: grounded = active clamp (TG1/TG2 forced on to discharge output), tied to INTVCC = disable clamp (normal regulation continues). It also determines light-load mode during external sync. This dual function allows safe handling of feedback faults while preserving design flexibility.
Does the LTC3784HGN#PBF support both RSENSE and DCR current sensing?
Yes, the LTC3784HGN#PBF supports both methods. Its SENSE+ and SENSE– pins accept 2.3V–60V common-mode voltage and feature programmable current sense thresholds (42mV/68mV/90mV via ILIM pin) - enabling accurate current measurement using either discrete shunt resistors or inductor DCR, reducing component count and power loss.
LTC3784HGN#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3784HGN#PBF FAQ
1.How can I place an order for LTC3784HGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784HGN#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 LTC3784HGN#PBF reliable?
The price and inventory of LTC3784HGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784HGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784HGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784HGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784HGN#PBF?
LTC3784HGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784HGN#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 LTC3784HGN#PBF?
For technical support, including LTC3784HGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784HGN#PBF requirements.
6.How does Aetrix verify that LTC3784HGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784HGN#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 LTC3784HGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784HGN#PBF?
All LTC3784HGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784HGN#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 LTC3784HGN#PBF part is unused and in its original packaging.
Return procedure for LTC3784HGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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