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Analog Devices Inc. LTC3784IUFD#TRPBF
- Part No.:
- LTC3784IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784IUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
LTC3784IUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance PolyPhase® synchronous boost controller driving two N-channel MOSFET stages out-of-phase. It supports 4.5V–60V input, delivers up to 60V output, features ±1% 1.200V reference, 28μA quiescent current, and phase-lockable 75kHz–850kHz operation - enabling high-efficiency, low-noise 24V/10A automotive power supplies.
For engineers reviewing the LTC3784IUFD#TRPBF datasheet, LTC3784IUFD#TRPBF pinout, LTC3784IUFD#TRPBF application, or LTC3784IUFD#TRPBF equivalent, key selection criteria include its dual-phase current-mode control architecture, RSENSE/DCR sensing flexibility, 100% duty cycle capability, thermally enhanced 4mm × 5mm QFN package, and support for Burst Mode®, pulse-skipping, and forced continuous light-load operation.
Technical Context
The LTC3784IUFD#TRPBF implements constant-frequency current-mode control with two independent, out-of-phase channels. Each channel uses an internal error amplifier (transconductance = 2 mmho), peak current sensing via SENSE1±/SENSE2±, and dual gate drivers (TG/BG) with matched 20ns rise/fall times and 30ns dead-time control.
Its architecture integrates a programmable VCO (50kHz–900kHz), PLL-based synchronization (75kHz–850kHz), and flexible mode selection via PLLIN/MODE and OVMODE pins. The INTVCC LDO (5.4V ±2%) can be powered from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with automatic switchover at 4.8V and 250mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V; operates down to 2.3V after startup when VBIAS is powered from VOUT - enables wide battery chemistries and cold-crank resilience. |
| Output Voltage Range | Up to 60V; regulated by ±1% 1.200V internal reference - supports high-voltage industrial and automotive loads. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - extends battery life in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - balances efficiency, EMI, and magnetics size. |
| Current Sensing | RSENSE or inductor DCR sensing; peak threshold selectable as 42mV/68mV/90mV via ILIM pin - enables precision overcurrent protection without sense resistors. |
| Package Thermal Performance | 28-pin 4mm × 5mm QFN with exposed pad; θJA = 43°C/W - sustains high-power operation with minimal heatsinking. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial environments. |
Pinout & Package
Thermally enhanced 28-lead plastic QFN (4mm × 5mm), exposed pad (Pin 29) connected to PGND for optimal thermal dissipation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or tie to INTVCC/GND selects fixed 535kHz/350kHz - enables precise EMI tuning. |
| PLLIN/MODE (Pin 4) | Light-load mode & external sync input | Pull to GND → Burst Mode®; tie to INTVCC → forced continuous; apply external clock → PLL sync - critical for multi-phase coordination and efficiency optimization. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense differential input | Common-mode range 2.3V–60V; supports RSENSE or DCR sensing - eliminates need for isolated current transformers in high-side sensing. |
| TG1/BG1 (Pins 17,19) | Top/bottom gate drive outputs | Drives N-channel MOSFET gates with 1.2Ω pull-up/pull-down and 30ns dead-time - ensures robust synchronous rectification without shoot-through. |
| VFB (Pin 13) | Error amplifier feedback input | Compares output divider voltage to 1.200V reference; ±5nA input bias - enables high-impedance feedback networks minimizing load on output rail. |
| PGOOD (Pin 28) | Power-good open-drain output | Asserts low when VFB deviates >±10% for ≥45μs - provides reliable system-level power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitance requirements by ~70% vs single-phase and enables scalable 2-/3-/4-/6-/12-phase configurations - lowers BOM cost and board area. |
| Synchronous boost topology | Eliminates external Schottky diode; achieves >96% efficiency at 12V→24V/10A - reduces heat dissipation and simplifies thermal design. |
| 100% duty cycle capability | Allows seamless transition to pass-through mode during low-VIN conditions - maintains regulation during automotive cold-crank (e.g., 6V input → 24V output). |
| Three light-load operating modes | Burst Mode® (28μA IQ), pulse-skipping, or forced continuous - optimizes efficiency across 100μA–10A load range without compromising transient response. |
| Robust protection suite | Overvoltage protection (OVP) with configurable response, UVLO on INTVCC (3.6V/3.8V), and thermal shutdown - ensures reliability in harsh environments. |
Applications
| Automotive ADAS Power Supply | Industrial 24V Bus Booster |
|---|---|
|
Use Scenario: Powering radar modules and camera systems from 12V battery with strict EMI and cold-crank requirements. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating 24V/10A output with phase interleaving to suppress input ripple. Use Value: PolyPhase® operation cuts input capacitor count by 50%, while 28μA quiescent current meets ISO 16750-2 standby leakage limits. |
Use Scenario: Up-converting factory floor 12V DC bus to stable 24V for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: High-reliability boost controller with –40°C to +125°C operation and integrated OVP/UVLO. Use Value: 60V abs max input withstands 12V bus transients; 100% duty cycle maintains output during brownouts. |
| Medical Imaging Power Rail | Military Portable Radio Transmitter |
|
Use Scenario: Generating clean, low-noise 48V bias for CCD/CMOS image sensors in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-EMI PolyPhase® controller with programmable frequency and soft-start (SS pin). Use Value: Phase interleaving reduces conducted emissions below CISPR 22 Class B limits; ±1% reference ensures sensor accuracy. |
Use Scenario: Boosting 14.4V Li-ion battery to 28V RF power amplifier supply in handheld tactical radios. IC Role / Device Role / Timing Role: Ruggedized boost controller with MIL-STD-810H temperature rating and burst-mode ultra-low IQ. Use Value: 28μA quiescent current extends battery runtime in standby; 150°C max junction temp supports sealed enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3785IUFD#TRPBF | Dual-output version with independent VOUT1/VOUT2 regulation; adds second error amplifier and FB2 pin - no shared current sensing. | Required for dual-rail systems (e.g., ±15V analog supplies); not suitable for single-output high-current designs. | Select LTC3785IUFD#TRPBF only when two independently regulated outputs are needed; LTC3784IUFD#TRPBF remains optimal for single-output >10A applications. |
| MP9942GQ-P | Single-phase, 60V-input, 5A integrated FET boost; lacks PolyPhase®, DCR sensing, and PLL sync - smaller footprint but lower power. | Targeted at space-constrained consumer electronics; cannot scale to 10A+ or meet automotive EMI requirements. | Choose MP9942GQ-P for cost-sensitive, low-power (<5A) applications; LTC3784IUFD#TRPBF is required for high-efficiency, high-current, multi-phase designs. |
Compared with LTC3785IUFD#TRPBF and MP9942GQ-P, the LTC3784IUFD#TRPBF uniquely delivers dual-phase interleaving, 10A+ scalability, and automotive-grade thermal performance in a single-output configuration - making it the only viable option for 24V/10A ADAS power supplies requiring low EMI and cold-crank resilience.
Availability
LTC3784IUFD#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 24V bus boosters, medical imaging bias rails, and military portable radio transmitters requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LTC3784IUFD#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 full product continuity, technical documentation, and manufacturing for all LTC legacy parts including the LTC3784 series.
The LTC3784 belongs to Linear's high-voltage PolyPhase® controller family, designed specifically for high-efficiency, low-EMI, multi-phase DC/DC boost conversion in automotive, industrial, and medical systems demanding wide input ranges and rugged thermal performance.
FAQ
What is the maximum input voltage the LTC3784IUFD#TRPBF can withstand?
The LTC3784IUFD#TRPBF has an absolute maximum input voltage rating of 65V on the VBIAS pin. Its functional operating range is 4.5V to 60V, and it can operate down to 2.3V after startup when biased from the output rail - making it suitable for automotive cold-crank scenarios where input may dip below 6V. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3784IUFD#TRPBF support inductor DCR current sensing?
Yes, the LTC3784IUFD#TRPBF supports both RSENSE and inductor DCR current sensing via its SENSE1± and SENSE2± pins. The common-mode voltage range is 2.3V to 60V, and the differential input range is ±0.3V. DCR sensing eliminates the power loss and board area of discrete sense resistors - a key advantage in high-current, thermally constrained applications like automotive power supplies.
How does the PLLIN/MODE pin configure light-load operation on the LTC3784IUFD#TRPBF?
The PLLIN/MODE pin on the LTC3784IUFD#TRPBF selects light-load behavior: grounded → Burst Mode® (ultra-low IQ); tied to INTVCC → forced continuous conduction; biased between 1.2V and INTVCC–1.3V → pulse-skipping. When driven by an external clock, this pin becomes the PLL input, and OVMODE then determines light-load mode - enabling precise system-level efficiency optimization.
What is the purpose of the EXTVCC pin on the LTC3784IUFD#TRPBF?
The EXTVCC pin on the LTC3784IUFD#TRPBF provides an alternative power source for the internal 5.4V INTVCC LDO. When EXTVCC exceeds 4.8V (with 250mV hysteresis), it disables the VBIAS-powered LDO and supplies INTVCC instead - reducing power dissipation and improving efficiency. This is especially valuable when a clean, low-noise auxiliary supply is available, such as a post-regulated 5V rail.
Can the LTC3784IUFD#TRPBF be used in a single-phase configuration?
Yes, the LTC3784IUFD#TRPBF can operate in single-phase mode by connecting both TG1/TG2 and BG1/BG2 outputs in parallel and tying PHASMD to SGND. However, its full value lies in PolyPhase® operation: dual-phase interleaving reduces input/output ripple, allows smaller magnetics, and improves thermal distribution - so single-phase use forfeits key advantages built into the LTC3784IUFD#TRPBF architecture.
LTC3784IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- 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-QFN (4x5)
LTC3784IUFD#TRPBF FAQ
1.How can I place an order for LTC3784IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784IUFD#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 LTC3784IUFD#TRPBF reliable?
The price and inventory of LTC3784IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784IUFD#TRPBF?
LTC3784IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784IUFD#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 LTC3784IUFD#TRPBF?
For technical support, including LTC3784IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3784IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784IUFD#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 LTC3784IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784IUFD#TRPBF?
All LTC3784IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784IUFD#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 LTC3784IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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