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Analog Devices Inc. LTC3784HUFD#PBF
- Part No.:
- LTC3784HUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784HUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,161
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Product details
Overview
LTC3784HUFD#PBF 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 operates down to 2.3V after startup when biased from VOUT - ideal for industrial 12V-to-24V/10A polyphase boost power supplies.
For engineers reviewing the LTC3784HUFD#PBF datasheet, LTC3784HUFD#PBF pinout, LTC3784HUFD#PBF application, or LTC3784HUFD#PBF equivalent, key selection criteria include its 28-pin 4mm × 5mm QFN package with exposed thermal pad, phase-lockable 75kHz–850kHz operation, dual-channel current sensing (RSENSE or DCR), 100% duty cycle capability, and –40°C to +150°C junction temperature rating.
Technical Context
The LTC3784HUFD#PBF implements constant-frequency current-mode control with two independent, interleaved channels operating 180° out-of-phase. Its dual-stage architecture reduces input/output ripple, capacitor stress, and EMI while enabling scalable 2-, 3-, 4-, 6-, or 12-phase configurations via daisy-chained CLKOUT signals.
It integrates a precision 1.200V ±1% reference, programmable current limit (42mV/68mV/90mV via ILIM), internal 5.4V LDO (INTVCC), EXTVCC switchover at 4.8V, and three light-load modes - Burst Mode®, pulse-skipping, or forced continuous - selected via PLLIN/MODE and OVMODE pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V; operates down to 2.3V after startup if VBIAS powered from VOUT - enables wide battery and industrial supply compatibility. |
| Output Voltage Range | Up to 60V; regulated by external resistive divider at VFB - supports high-voltage LED drivers, telecom, and industrial bus systems. |
| Reference Voltage Accuracy | ±1% at 1.200V (1.188V–1.212V); specified over –40°C to +150°C - ensures stable output regulation across extended temperature range. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - critical for always-on or low-power standby applications. |
| Switching Frequency Range | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz - balances efficiency, size, and EMI for compact high-power designs. |
| Package & Thermal Rating | 28-pin 4mm × 5mm QFN with exposed GND pad; θJA = 43°C/W; rated for –40°C to +150°C junction temperature - optimized for thermally demanding environments. |
| Current Sensing Options | RSENSE or inductor DCR sensing; peak sense threshold selectable as 42mV/68mV/90mV via ILIM pin - supports high-efficiency, low-loss sensing without dedicated shunts. |
Pinout & Package
Thermally enhanced 28-pin (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), rated for –40°C to +150°C junction temperature. Exposed pad must be soldered to PCB ground for specified thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1, 4) | 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, 7) | External sync input / light-load mode select | Accepts external clock for phase-locking; selects Burst Mode®, pulse-skipping, or forced continuous based on voltage level - essential for multi-phase synchronization and efficiency optimization. |
| SENSE1+/SENSE1– (Pins 2, 3, 12, 27) | Channel 1 current sense differential inputs | Supports RSENSE or DCR sensing with 2.3V–60V common-mode range - allows placement on high-side or low-side of inductor without level-shifting. |
| TG1/TG2 (Pins 17, 26, 14, 23) | Top gate drivers | Drive synchronous N-MOSFET gates; support 100% duty cycle - enables zero-voltage switching and ultra-high step-up ratios. |
| BG1/BG2 (Pins 19, 24, 16, 21) | Bottom gate drivers | Drive main N-MOSFET gates with 30ns dead-time control - prevents shoot-through and ensures robust gate drive timing. |
| VBIAS (Pin 20, 23) | Main bias supply input | Accepts 4.5V–60V; powers internal circuits and charge pumps - enables self-biasing from output for ultra-low VIN operation after startup. |
| PGOOD (Pin 25, 28) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45μs - provides reliable system-level fault signaling without external comparators. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® interleaving | Reduces input/output RMS current by up to 70% vs single-phase, cutting capacitor count and size while lowering EMI peaks. |
| Synchronous rectification | Eliminates external Schottky diode losses, increasing efficiency >3% at full load and reducing thermal design burden. |
| 100% duty cycle capability | Enables seamless transition to pass-through mode during low-VIN conditions, supporting wide-input-range battery systems. |
| Three light-load operating modes | Burst Mode® achieves >85% efficiency at 10mA load; pulse-skipping maintains regulation with low noise; forced continuous avoids subharmonics. |
| Robust thermal grade | H-grade qualification (–40°C to +150°C TJ) with 43°C/W θJA enables deployment in under-hood automotive, industrial motor drives, and military enclosures. |
Applications
| Industrial Power Supply | Automotive DC-DC Boost |
|---|---|
Use Scenario: 12V battery-powered industrial PLC requiring stable 24V/10A output with low EMI and high reliability in harsh ambient temperatures. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing interleaved gate drive, current sensing, and soft-start sequencing. Use Value: PolyPhase® operation cuts input capacitor requirements by 50% and reduces thermal stress on MOSFETs versus single-phase alternatives. | Use Scenario: Automotive infotainment head unit needing 24V rail from 9V–16V battery with cold-crank immunity (VIN down to 2.3V after startup). IC Role / Device Role / Timing Role: High-voltage boost controller providing regulated output with Burst Mode® for low-quiescent operation during vehicle sleep mode. Use Value: 28μA IQ and 4μA shutdown current extend battery life; H-grade temp rating ensures operation at 150°C junction under hood. |
| Medical Imaging Power | Military Radar Bias Supply |
Use Scenario: Portable X-ray generator requiring tightly regulated 60V output from 24V input with minimal output ripple and fast transient response. IC Role / Device Role / Timing Role: Precision feedback-controlled boost controller using ±1% 1.200V reference and dual-channel current mode loop compensation. Use Value: 1.200V reference stability over temperature ensures <±0.1% output drift, critical for consistent X-ray tube performance. | Use Scenario: Active electronically scanned array (AESA) radar subsystem needing 48V bias from 28V aircraft bus with MIL-STD-810H environmental compliance. IC Role / Device Role / Timing Role: High-reliability polyphase controller with phase-lockable frequency and daisy-chain CLKOUT for synchronized multi-module operation. Use Value: Phase-locking eliminates beat frequencies between modules; exposed-pad QFN ensures thermal survivability in sealed radar enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781IUFD#PBF | Single-phase only; 4.5V–60V input; 28μA IQ; same 28-pin QFN but no CLKOUT or PHASMD pins - lacks polyphase capability. | Lower power (<100W), cost-sensitive designs where interleaving is unnecessary. | Select when polyphase operation is not required and board space is constrained - simpler BOM but higher input/output ripple. |
| LM5122MH/NOPB | Single-phase; 3V–65V input; 1.215V ref (±1.5%); 50μA IQ; 28-pin HTSSOP - no phase-locking, no daisy-chain, lower accuracy reference. | General-purpose boost for telecom or test equipment where extended temp range is not mandatory. | Choose for TI ecosystem compatibility and lower cost; avoid for H-grade or multi-phase systems requiring tight regulation. |
Compared with LTC3781IUFD#PBF and LM5122MH/NOPB, the LTC3784HUFD#PBF uniquely delivers true 2-phase interleaving, phase-locking, and –40°C to +150°C operation - making it the only option for high-reliability, high-power, thermally constrained polyphase boost applications.
Availability
LTC3784HUFD#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC boost converters, and medical imaging systems requiring stable component supply with guaranteed long-term availability and extended temperature performance.
Supply support for LTC3784HUFD#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 LTC3784 belongs to Linear's high-voltage PolyPhase® controller family, designed specifically for high-efficiency, high-power, multi-phase synchronous boost conversion in thermally demanding industrial, automotive, and military applications.
FAQ
What is the maximum junction temperature rating for the LTC3784HUFD#PBF?
The LTC3784HUFD#PBF is rated for a maximum junction temperature of +150°C and is guaranteed over the –40°C to +150°C operating junction temperature range. This H-grade qualification distinguishes it from E- and I-grade variants and enables use in under-hood automotive, industrial motor drives, and military systems where ambient temperatures exceed 125°C.
How does the LTC3784HUFD#PBF achieve operation down to 2.3V input after startup?
The LTC3784HUFD#PBF achieves 2.3V minimum operating input by biasing VBIAS from the boost output (VOUT) rather than the input rail (VIN). Once started, the internal charge pump and INTVCC LDO sustain operation even as VIN drops below 4.5V - a critical feature for cold-crank automotive scenarios and brownout recovery in industrial systems.
Can the LTC3784HUFD#PBF be configured for single-phase operation?
Yes, the LTC3784HUFD#PBF can be configured for single-phase operation by connecting both TG/BOOST/SW/BG pins in parallel and disabling one channel via SENSEx+ and SENSEx– open-circuit or grounding. However, doing so forfeits PolyPhase® benefits - for dedicated single-phase designs, the pin-compatible LTC3781IUFD#PBF is recommended.
What is the purpose of the ILIM pin on the LTC3784HUFD#PBF?
The ILIM pin on the LTC3784HUFD#PBF selects the peak current sense threshold: grounded = 42mV, floating = 68mV, tied to INTVCC = 90mV. This allows designers to optimize current-sense resistor value and power loss trade-offs across varying load ranges and MOSFET RDS(on) values without changing external components.
Does the LTC3784HUFD#PBF support external synchronization across multiple units?
Yes, the LTC3784HUFD#PBF supports daisy-chained multiphase operation via the CLKOUT pin and phase alignment control through the PHASMD pin. When PLLIN/MODE receives an external clock, the internal PLL synchronizes BG1 to that clock edge, and CLKOUT propagates timing to subsequent LTC3784HUFD#PBF units - enabling precise N-phase interleaving up to 12 phases.
LTC3784HUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-WFQFN Exposed Pad
- 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-QFN (4x5)
LTC3784HUFD#PBF FAQ
1.How can I place an order for LTC3784HUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784HUFD#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 LTC3784HUFD#PBF reliable?
The price and inventory of LTC3784HUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784HUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784HUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784HUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784HUFD#PBF?
LTC3784HUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784HUFD#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 LTC3784HUFD#PBF?
For technical support, including LTC3784HUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784HUFD#PBF requirements.
6.How does Aetrix verify that LTC3784HUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784HUFD#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 LTC3784HUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784HUFD#PBF?
All LTC3784HUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784HUFD#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 LTC3784HUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3784HUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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