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Analog Devices Inc. LTC3784HUFD#TRPBF
- Part No.:
- LTC3784HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784HUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,167
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Product details
Overview
LTC3784HUFD#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 operates from 4.5V to 60V input, delivers up to 60V output, features ±1% 1.200V reference, RSENSE/DCR current sensing, and 100% duty cycle capability - enabling high-efficiency, low-noise 24V/10A automotive power supplies.
For engineers reviewing the LTC3784HUFD#TRPBF datasheet, LTC3784HUFD#TRPBF pinout, LTC3784HUFD#TRPBF application, or LTC3784HUFD#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 28-pin 4mm × 5mm QFN package with exposed thermal pad, phase-lockable 75kHz–850kHz operation, and dual-channel current-mode control for PolyPhase® input/output capacitor reduction.
Technical Context
The LTC3784HUFD#TRPBF implements constant-frequency current-mode control with two independent, out-of-phase switching channels. Each channel uses peak-current sensing via SENSE1+/– and SENSE2+/– inputs, with programmable current limit thresholds (42mV/75mV/100mV) set by ILIM pin state and matched within ±12mV.
Its architecture integrates a 5.4V internal LDO (INTVCC), supports external biasing via EXTVCC (switchover at 4.8V), and includes a PLL-based synchronization engine (PLLIN/MODE pin) enabling daisy-chained multiphase systems up to 12 phases. Soft-start is controlled by SS pin with 10µA internal charge current.
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 brownout resilience. |
| Output Voltage Range | Up to 60V; regulated feedback voltage = 1.200V ±1% - supports high-voltage industrial and automotive loads. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz - allows EMI optimization and inductor size reduction. |
| Quiescent Current | 28µA in pulse-skipping/forced continuous mode; <4µA in shutdown - extends battery life in always-on systems. |
| Current Sense Threshold | 42mV/75mV/100mV (ILIM = GND/floating/INTVCC); matching ≤±12mV - ensures balanced phase current sharing in PolyPhase® operation. |
| Thermal Rating | Junction temperature range: –40°C to 150°C; θJA = 43°C/W (QFN) - qualified for under-hood automotive and harsh industrial environments. |
| Package | 28-pin 4mm × 5mm plastic QFN with exposed thermal pad (Pin 29 = GND) - enables high-power density and efficient heat dissipation. |
Pinout & Package
28-pin (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), rated for –40°C to 150°C operating junction temperature. Exposed pad must be soldered to PCB ground for specified thermal performance (θJA = 43°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1, 4) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or tie to INTVCC/GND selects fixed frequencies - enables precise EMI management. |
| PLLIN/MODE (Pin 4, 7) | External sync input / light-load mode select | Accepts external clock for phase locking; selects Burst Mode®, pulse-skipping, or forced continuous mode - critical for efficiency vs. noise tradeoffs. |
| SENSE1+/–, SENSE2+/– (Pins 2, 3, 11, 12, 27, 28) | Dual-channel current sense inputs | Support RSENSE or DCR sensing; common-mode range 2.3V–60V - enables accurate per-phase current regulation in multiphase designs. |
| TG1/TG2 (Pins 17, 26) | Top gate drivers | Drive synchronous N-MOSFET gates; 1.2Ω pull-up/down resistance - ensures fast, low-loss switching with 100% duty cycle support. |
| BG1/BG2 (Pins 19, 24) | Bottom gate drivers | Drive main N-MOSFET gates; 30ns switch-on delay - enables precise dead-time control and prevents shoot-through. |
| VBIAS (Pin 20) | Main supply input | 4.5V–60V operating range; powers internal LDO - allows direct connection to VIN or boosted VOUT for ultra-low-input operation. |
| INTVCC (Pin 17) | Internal 5.4V LDO output | Supplies control logic and gate drivers; decoupled with ≥4.7µF ceramic - provides stable bias independent of VBIAS ripple. |
| PGOOD (Pin 25) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45µs - enables system-level fault detection and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitance requirements by ~50% and lowers RMS input current ripple - cuts BOM cost and improves reliability. |
| Synchronous rectification control | Drives both top and bottom N-MOSFETs per phase with matched gate drive timing - eliminates body-diode conduction losses, boosting efficiency >95% at full load. |
| Wide input range with 2.3V post-startup operation | Enables cold-cranking support in 12V automotive systems without auxiliary bias - simplifies power architecture and reduces component count. |
| Programmable current limit with precision matching | Three threshold options (42/75/100mV) with ≤±12mV inter-channel matching - ensures balanced current sharing across phases without external calibration. |
| Thermally enhanced QFN package | 43°C/W junction-to-ambient thermal resistance with exposed pad - sustains 150°C junction temperature in compact layouts without heatsinks. |
Applications
| Automotive ADAS Power Supply | Industrial 24V Bus Booster |
|---|---|
Use Scenario: Powering radar modules and camera systems from 9V–16V vehicle battery with strict EMI limits. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller regulating 24V @ 10A with phase interleaving. Use Value: PolyPhase® operation reduces input capacitor RMS current by 70%, lowering thermal stress and enabling smaller 1210-case MLCCs. |
Use Scenario: Up-converting 12V factory floor supply to stable 24V for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: High-efficiency boost controller with programmable frequency and robust overvoltage protection. Use Value: ±1% reference and 100% duty cycle capability maintain regulation during brownouts, preventing process interruption. |
| Medical Imaging HV Bias Supply | Military Portable Radio Transmitter |
Use Scenario: Generating 48V–60V bias for CCD/CMOS image sensors in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision-controlled boost converter with soft-start and power-good monitoring. Use Value: 10µA SS pin charge current enables linear, jitter-free voltage ramp - avoids sensor reset glitches during power-up. |
Use Scenario: Providing 28V RF amplifier supply from 12V tactical battery with MIL-STD-810H thermal compliance. IC Role / Device Role / Timing Role: High-temp-rated PolyPhase® controller supporting 150°C ambient operation. Use Value: –40°C to 150°C qualification and 43°C/W thermal design eliminate need for derating or forced air cooling. |
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; rated for –40°C to 125°C junction temperature (vs. 150°C for H-grade). | Suitable for commercial/industrial environments without extended thermal stress. | Select when ambient temperature remains below 105°C and cost sensitivity outweighs extended temp margin. |
| LTC3784EGN#TRPBF | SSOP-28 package (θJA = 80°C/W); identical electrical specs but larger footprint and higher thermal resistance. | Preferred where manual assembly, rework, or legacy board compatibility is required. | Choose for prototyping or low-volume production where QFN reflow capability is unavailable. |
Compared with LTC3784IUFD#TRPBF and LTC3784EGN#TRPBF, the LTC3784HUFD#TRPBF uniquely supports 150°C junction operation in the thermally superior 4mm × 5mm QFN package - delivering higher power density and reliability in under-hood or enclosed industrial deployments without thermal derating.
Availability
LTC3784HUFD#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial 24V bus boosters, medical imaging bias generators, and military portable radio transmitters requiring stable component supply across extended temperature ranges.
Supply support for LTC3784HUFD#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. Linear Technology was renowned for precision power management and signal conditioning ICs with rigorous automotive and military qualification.
The LTC3784HUFD#TRPBF belongs to Linear's PolyPhase® synchronous controller product line, designed specifically for high-efficiency, low-noise, multi-phase DC/DC conversion in demanding automotive, industrial, and medical applications.
FAQ
What is the maximum junction temperature rating for the LTC3784HUFD#TRPBF?
The LTC3784HUFD#TRPBF is guaranteed over a junction temperature range of –40°C to 150°C, making it suitable for under-hood automotive and high-ambient industrial environments. Its 4mm × 5mm QFN package achieves θJA = 43°C/W when the exposed pad is properly soldered to PCB ground, enabling sustained operation at full load without thermal derating up to 150°C.
How does the LTC3784HUFD#TRPBF support PolyPhase® operation with multiple controllers?
The LTC3784HUFD#TRPBF supports daisy-chained PolyPhase® configurations via its CLKOUT pin and PHASMD pin, which control phase offset between BG1 and CLKOUT. When synchronized using PLLIN/MODE, multiple LTC3784HUFD#TRPBF units can be configured for 2-, 3-, 4-, 6-, or 12-phase operation - reducing input/output ripple and allowing smaller passive components without increasing switching frequency.
Can the LTC3784HUFD#TRPBF operate with an input voltage below 4.5V?
Yes - the LTC3784HUFD#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output (VOUT) or an auxiliary supply. This "bootstrap" capability enables cold-cranking support in 12V automotive systems where battery voltage dips below 4.5V during engine cranking, maintaining regulation without external bias circuitry.
What current sensing methods does the LTC3784HUFD#TRPBF support?
The LTC3784HUFD#TRPBF supports both RSENSE (shunt resistor) and inductor DCR current sensing on both channels via dedicated SENSE1+/– and SENSE2+/– pins. The common-mode voltage range is 2.3V to 60V, and the current limit threshold is programmable to 42mV, 75mV, or 100mV via the ILIM pin state - enabling flexible, accurate per-phase current monitoring without additional amplifiers.
How is overvoltage protection implemented in the LTC3784HUFD#TRPBF?
Overvoltage protection in the LTC3784HUFD#TRPBF is controlled by the OVMODE pin. When tied to GND, overvoltage protection is enabled: if VFB exceeds 1.32V (110% of 1.200V), TG1/TG2 are forced ON until the condition clears. When tied to INTVCC, OVP is disabled and phase operation follows the selected light-load mode - providing design flexibility for systems requiring graceful degradation versus hard shutdown.
LTC3784HUFD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3784HUFD#TRPBF FAQ
1.How can I place an order for LTC3784HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784HUFD#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 LTC3784HUFD#TRPBF reliable?
The price and inventory of LTC3784HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784HUFD#TRPBF?
LTC3784HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784HUFD#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 LTC3784HUFD#TRPBF?
For technical support, including LTC3784HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3784HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784HUFD#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 LTC3784HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784HUFD#TRPBF?
All LTC3784HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784HUFD#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 LTC3784HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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