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Analog Devices Inc. LTC3784EUFD#PBF
- Part No.:
- LTC3784EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784EUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:249
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Product details
Overview
LTC3784EUFD#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 deliver up to 60V output from 4.5V–60V input (down to 2.3V after startup), with ±1% 1.200V reference, RSENSE/DCR current sensing, and 100% duty cycle capability - used in high-efficiency 24V/10A industrial power supplies.
For engineers reviewing the LTC3784EUFD#PBF datasheet, LTC3784EUFD#PBF pinout, LTC3784EUFD#PBF application, or LTC3784EUFD#PBF equivalent, key selection criteria include phase-lockable frequency (75–850 kHz), dual-channel current-mode control, thermally enhanced 4mm × 5mm QFN package, and support for Burst Mode®, pulse-skipping, and forced continuous operation at light loads.
Technical Context
The LTC3784EUFD#PBF implements constant-frequency current-mode control across two independent channels operating 180° out-of-phase, using separate SENSE1+/– and SENSE2+/– inputs for per-phase inductor current monitoring and peak-current limiting via ITH voltage. Its dual-stage architecture reduces input/output ripple and capacitor requirements versus single-phase designs.
It integrates a phase-locked loop (PLLIN/MODE pin) for external clock synchronization, programmable oscillator (50–900 kHz via FREQ pin resistor), internal 5.4V LDO (INTVCC), EXTVCC switchover at 4.8V, and overvoltage protection selectable via OVMODE pin - all supporting robust operation in automotive and industrial environments with –40°C to 125°C junction temperature range.
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 powered from VOUT - enables wide battery and bus voltage compatibility. |
| Output Voltage Range | Up to 60V - supports high-voltage industrial and automotive auxiliary rails. |
| Reference Voltage Accuracy | ±1% at 1.200V - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - critical for always-on systems. |
| Switching Frequency Range | Programmable 50kHz–900kHz or PLL-synchronized 75kHz–850kHz - balances efficiency, size, and EMI performance. |
| Current Sensing | RSENSE or inductor DCR - enables flexible, low-loss sensing without dedicated shunt resistors. |
| Package | 28-pin 4mm × 5mm QFN (UFD) with exposed pad - θJA = 43°C/W for high-power density thermal management. |
Pinout & Package
28-pin (4mm × 5mm) plastic QFN package with exposed ground pad (Pin 29), rated for –40°C to 125°C operating junction temperature and optimized for low thermal resistance (θJA = 43°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50–900 kHz; DC voltage or tie to INTVCC/GND selects fixed frequencies - enables precise EMI tuning. |
| PLLIN/MODE (Pin 4) | External sync input / light-load mode selector | Accepts external clock for phase locking; configures Burst Mode®, pulse-skipping, or forced continuous operation - critical for dynamic efficiency optimization. |
| SENSE1+, SENSE1– (Pins 2, 3) | Channel 1 current sense differential input | Supports RSENSE or DCR sensing with 2.3V–60V common-mode range - allows placement on high-side or low-side of inductor. |
| VFB (Pin 13) | Error amplifier feedback input | Compares output voltage (via external divider) to 1.200V reference - defines regulated output setpoint. |
| ITH (Pin 14) | Error amplifier output / current limit threshold | Voltage sets peak inductor current per phase - directly links output regulation to current-mode stability. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from 1.200V for ≥45μs - provides system-level fault signaling. |
| VBIAS (Pin 23) | Main bias supply input | 4.5V–60V input powering internal LDO; can be tied to VIN or VOUT - enables bootstrap operation below 4.5V post-startup. |
| INTVCC (Pin 20) | Internal 5.4V LDO output | Powers gate drivers and control circuitry; bypassed with ≥4.7μF ceramic capacitor - ensures stable core logic supply. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitance by ~50% and lowers RMS inductor current vs. single-phase - cuts BOM cost and board area. |
| Synchronous rectification control | Drives both top and bottom N-MOSFETs with matched 1.2Ω pull-up/pull-down and <30ns dead-time - eliminates body-diode conduction loss. |
| 100% duty cycle capability | Enables VOUT ≥ VIN operation without dropout - essential for battery backup and hold-up applications. |
| Three light-load operating modes | Burst Mode® (low IQ), pulse-skipping (medium IQ), or forced continuous (low noise) - selectable per application requirement. |
| Robust protection suite | Includes overvoltage protection (OVMODE-selectable), undervoltage lockout (3.6V/3.8V), thermal shutdown, and current-limit matching (±12mV) - ensures field reliability. |
Applications
| Industrial Motor Drives | Automotive ADAS Power Rails |
|---|---|
|
Use Scenario: Boosting 12V vehicle battery to 24V/10A for radar and camera modules requiring clean, stable supply. IC Role / Device Role: Dual-phase synchronous boost controller managing two parallel N-MOSFET stages with out-of-phase switching. Use Value: Reduces input ripple current by 70%, enabling smaller input capacitors and meeting CISPR-25 Class 5 EMI limits. |
Use Scenario: Generating 48V intermediate rail from 12V battery in next-gen ADAS domain controllers. IC Role / Device Role: High-voltage boost controller with 60V output capability and 2.3V startup support for cold-crank conditions. Use Value: 28μA quiescent current extends battery life during vehicle sleep mode; 125°C rating supports under-hood placement. |
| Medical Imaging Power Supplies | Military Portable Radios |
|
Use Scenario: Providing regulated 60V output from 24V input for X-ray detector bias supplies with strict noise and stability requirements. IC Role / Device Role: Precision current-mode controller with ±1% reference and programmable soft-start (SS pin) for controlled ramp-up. Use Value: Low 45μs PGOOD delay and ±10% trip threshold ensure rapid fault detection without false triggering during transient events. |
Use Scenario: High-reliability boost converter in manpack radios operating across –40°C to +85°C ambient with wide input variation. IC Role / Device Role: Dual-phase controller with MIL-STD-883 qualified temperature grade (E-grade: –40°C to 125°C) and 150°C max junction rating. Use Value: Exposed-pad QFN package delivers 43°C/W thermal resistance - maintains safe junction temperature under full 240W load. |
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; same 4.5V–60V input, 60V output, but no PolyPhase® or CLKOUT daisy-chaining. | Limited to ≤12A output; higher input/output ripple; unsuitable for >200W systems requiring phase interleaving. | Select when cost-sensitive, lower-power (<150W), or space-constrained designs eliminate need for multiphase benefits. |
| TPS40210DGQ | Single-phase, 4.5V–52V input, 60V output; no integrated PLL, no Burst Mode®, higher 1.5mA IQ. | No phase synchronization or light-load efficiency optimization; requires external compensation; less robust OVP. | Choose for TI ecosystem integration or where fixed-frequency operation without sync is sufficient and thermal budget allows higher IQ. |
Compared with LTC3784EUFD#PBF, LTC3781IUFD#PBF sacrifices phase interleaving and daisy-chain capability for lower cost and footprint, while TPS40210DGQ trades advanced light-load modes and precision reference for broader vendor support and simpler layout - neither offers identical PolyPhase® efficiency or thermal performance at 240W.
Availability
LTC3784EUFD#PBF is available at Aetrix Electronics and suitable for industrial motor drives, automotive ADAS subsystems, medical imaging power supplies, and military portable radios requiring stable component supply, extended temperature operation, and high-efficiency boost conversion.
Supply support for LTC3784EUFD#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 and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3784EUFD#PBF belongs to Linear's PolyPhase® controller family, designed specifically for high-power, high-efficiency DC/DC boost conversion in space- and thermal-constrained applications demanding multi-phase ripple cancellation and ultra-low quiescent current.
FAQ
What is the minimum input voltage for LTC3784EUFD#PBF after startup?
The LTC3784EUFD#PBF operates down to 2.3V after startup when VBIAS is powered from the output rail (e.g., VOUT). This enables continued regulation during brownout or cold-crank conditions where input voltage dips below the nominal 4.5V minimum. The device must first start from ≥4.5V to initialize internal circuitry before sustaining operation at 2.3V.
How does the LTC3784EUFD#PBF support multiphase synchronization across multiple ICs?
The LTC3784EUFD#PBF uses its CLKOUT pin (Pin 3) and PHASMD pin (Pin 2) to enable daisy-chained multiphase operation. CLKOUT outputs a digital signal synchronized to BG1, and PHASMD selects the phase offset (0°, 90°, 180°, or 270°) between BG1 and CLKOUT - allowing up to 12-phase configurations when cascading multiple LTC3784EUFD#PBF units.
Can LTC3784EUFD#PBF operate with inductor DCR current sensing only?
Yes, the LTC3784EUFD#PBF supports both RSENSE and inductor DCR current sensing via the SENSE1+/– and SENSE2+/– pins. DCR sensing eliminates shunt resistor losses and improves efficiency, especially at high currents. The common-mode voltage range (2.3V–60V) and internal filtering allow direct connection to the inductor's DCR network without additional amplification.
What is the purpose of the ILIM pin on LTC3784EUFD#PBF?
The ILIM pin (Pin 1) sets the peak current sense threshold for both channels: tying to GND selects 50mV, floating selects 75mV, and connecting to INTVCC selects 100mV. This adjusts the current limit point without changing external sense components - simplifying design reuse across different power levels while maintaining ±12mV matching between channels.
Does LTC3784EUFD#PBF require external compensation components?
Yes, the LTC3784EUFD#PBF requires external compensation on the ITH pin (Pin 14) to stabilize the current-mode control loop. A Type II or Type III network (resistor + capacitor + optional second capacitor) is typically used, with values determined by output voltage, inductance, and desired crossover frequency - detailed in the datasheet's "Compensation Design" section.
LTC3784EUFD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3784EUFD#PBF FAQ
1.How can I place an order for LTC3784EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784EUFD#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 LTC3784EUFD#PBF reliable?
The price and inventory of LTC3784EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784EUFD#PBF?
LTC3784EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784EUFD#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 LTC3784EUFD#PBF?
For technical support, including LTC3784EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784EUFD#PBF requirements.
6.How does Aetrix verify that LTC3784EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784EUFD#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 LTC3784EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784EUFD#PBF?
All LTC3784EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784EUFD#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 LTC3784EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3784EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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