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Analog Devices Inc. LTC3784IUFD#PBF
- Part No.:
- LTC3784IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784IUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:425
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Product details
Overview
LTC3784IUFD#PBF from Analog Devices (formerly Linear Technology) is a high-performance 60V 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 24V-to-48V telecom power supplies.
For engineers reviewing the LTC3784IUFD#PBF datasheet, LTC3784IUFD#PBF pinout, LTC3784IUFD#PBF application, or LTC3784IUFD#PBF equivalent, key selection criteria include its dual-phase current-mode control architecture, programmable 50kHz–900kHz switching frequency, RSENSE/DCR sensing flexibility, 100% duty cycle capability, and thermally enhanced 4mm × 5mm QFN package with exposed ground pad.
Technical Context
The LTC3784IUFD#PBF implements constant-frequency current-mode control with two independent channels operating 180° out-of-phase to reduce input/output ripple and capacitor stress. Its dual-stage gate drivers support synchronous rectification with top-gate rise/fall times of 20ns and bottom-gate delay control enabling precise dead-time management.
It integrates a phase-lockable PLL (75kHz–850kHz), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and overvoltage protection configurable via OVMODE pin. The internal 5.4V LDO powers control circuitry from either VBIAS or EXTVCC, with automatic switchover at 4.8V.
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 brownout resilience in battery-backed systems. |
| Output Voltage Range | Up to 60V; regulated by ±1% 1.200V internal reference - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - extends battery life in always-on industrial sensors. |
| 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 - supports low-loss, cost-effective current monitoring. |
| Package | 28-pin 4mm × 5mm plastic QFN with exposed GND pad (θJA = 43°C/W) - provides superior thermal performance for high-power boost designs. |
| Operating Temp | –40°C to +125°C junction - qualified for extended industrial and automotive under-hood applications. |
Pinout & Package
Thermally enhanced 28-pin (4mm × 5mm) plastic QFN package with exposed ground pad (Pin 29), rated θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | 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) | External sync input / light-load mode selector | Accepts external clock for phase-locking; configures Burst Mode®/pulse-skipping/forced continuous - critical for multi-phase synchronization and efficiency optimization. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense differential inputs | Supports 2.3V–60V common-mode range; accepts RSENSE or DCR sensing - enables accurate current limiting across wide VIN/VOUT ratios. |
| VFB (Pin 13) | Error amplifier feedback input | Compares output divider voltage to 1.200V reference; ±5nA input bias - allows high-impedance feedback networks without gain error. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% for ≥45μs - provides reliable system-level power sequencing and fault reporting. |
| INTVCC (Pin 20) | Internal 5.4V LDO output | Powers gate drivers and analog circuitry; requires ≥4.7μF low-ESR ceramic decoupling - ensures stable operation during transient load steps. |
| GND (Pin 29, Exposed Pad) | Power and thermal ground reference | Must be connected to PCB ground plane; primary thermal path - essential for maintaining TJ ≤ 125°C at full load. |
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. |
| Synchronous N-MOSFET control | 100% duty cycle capability and matched top/bottom gate drive timing minimize conduction losses and body-diode conduction. |
| Flexible current sensing | Configurable 42/68/90mV current limit thresholds via ILIM pin - accommodates diverse RSENSE values and DCR tolerances. |
| Low IQ and shutdown modes | 28μA operating IQ and <4μA shutdown current - meets stringent energy budget requirements in IoT edge nodes. |
| Robust protection suite | Overvoltage protection (OVP), undervoltage lockout (UVLO), thermal shutdown, and PGOOD monitoring - ensures safe operation in unattended industrial equipment. |
Applications
| Industrial Telecom Power | Automotive ADAS Power |
|---|---|
Use Scenario: 12V vehicle battery boosted to 48V for radar/LiDAR modules in ADAS systems requiring clean, regulated supply with fast transient response. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing two parallel N-MOSFET stages with out-of-phase switching to suppress EMI and reduce input ripple. Use Value: Enables 240W (12V→24V/10A) operation with >96% efficiency at full load and <4μA shutdown current - extends battery runtime during parking mode. | Use Scenario: 24V industrial switchgear powered from 48V DC distribution bus, requiring isolated 60V auxiliary rail for high-side gate drivers. IC Role / Device Role / Timing Role: High-voltage PolyPhase® controller delivering regulated 60V output with ±1% accuracy and programmable soft-start via SS pin. Use Value: Supports 4.5V–60V input range and 2.3V post-startup operation - maintains functionality during severe brownouts in factory automation environments. |
| Medical Imaging Supply | Military Portable Radio |
Use Scenario: Portable ultrasound device requiring low-noise 36V rail from 12V Li-ion battery pack, with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: Synchronous boost controller using DCR current sensing and phase-locked frequency to meet CISPR-11 Class B emissions. Use Value: 28μA quiescent current and Burst Mode® operation extend battery life; 4mm × 5mm QFN package fits space-constrained handheld enclosures. | Use Scenario: Tactical radio with MIL-STD-1275E compliance needing 28V-to-42V boost conversion under cold-crank (6V) and surge (100V) conditions. IC Role / Device Role / Timing Role: Robust boost controller with 65V absolute max SW/BOOST ratings, UVLO hysteresis, and thermal shutdown. Use Value: –40°C to +125°C operating range and 150°C TJMAX rating ensure reliability in extreme field environments. |
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; no PLL sync; lower max frequency (600kHz); same QFN package | Lacks PolyPhase® current sharing and phase synchronization - unsuitable for >150W or low-EMI multi-phase designs | Select when cost-sensitive, lower-power (<100W), or single-phase simplicity is prioritized over ripple reduction. |
| LM5122MMX/NOPB | Single-phase; 3V–65V input; 600kHz max; no DCR sensing; different pinout; SOIC-20 package | No phase-locking, no soft-start programming, higher IQ (1.5mA), lacks OVMODE configuration | Choose for legacy designs requiring SOIC footprint or TI ecosystem compatibility, accepting trade-offs in efficiency and feature set. |
Compared with LTC3781IUFD#PBF and LM5122MMX/NOPB, the LTC3784IUFD#PBF uniquely delivers dual-phase PolyPhase® operation, programmable light-load modes, and integrated EXTVCC switchover - making it the only option among the three capable of scalable multi-phase architectures with sub-30μA quiescent current.
Availability
LTC3784IUFD#PBF is available at Aetrix Electronics and suitable for industrial telecom power, automotive ADAS, medical imaging, and military portable radio applications requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3784IUFD#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 industrial and aerospace applications.
The LTC3784IUFD#PBF belongs to Linear's PolyPhase® synchronous controller product line, designed specifically for high-efficiency, low-EMI, multi-phase DC/DC boost conversion in space- and thermal-constrained systems.
FAQ
What is the maximum input voltage rating for the LTC3784IUFD#PBF?
The LTC3784IUFD#PBF has an absolute maximum input voltage rating of 65V on the VBIAS pin, with normal operation specified from 4.5V to 60V. This 65V abs max rating allows safe handling of transients such as load dump in automotive applications, provided external clamping is used per design guidelines in the datasheet.
How does the LTC3784IUFD#PBF achieve 100% duty cycle operation?
The LTC3784IUFD#PBF achieves 100% duty cycle by disabling the top MOSFET gate driver (TG) and holding the bottom MOSFET (BG) continuously on when required - enabling seamless transition to dropout operation. This behavior is inherent to its synchronous boost architecture and is confirmed in the "Operation" section of the LTC3784 datasheet.
Can the LTC3784IUFD#PBF be configured for single-phase operation?
Yes, the LTC3784IUFD#PBF can be configured for single-phase operation by connecting both TG1/BG1 and TG2/BG2 outputs in parallel and disabling one channel via PHASMD pin configuration. However, this forfeits PolyPhase® benefits like reduced ripple and shared current stress - the device remains fully functional but operates as a single-channel controller.
What is the purpose of the EXTVCC pin on the LTC3784IUFD#PBF?
The EXTVCC pin on the LTC3784IUFD#PBF provides an alternative power source for the internal 5.4V LDO (INTVCC). When EXTVCC exceeds 4.8V, it automatically disables the VBIAS-powered LDO and supplies INTVCC instead - reducing power dissipation and improving efficiency in high-VIN applications where VBIAS would otherwise drop significant voltage across the internal regulator.
Does the LTC3784IUFD#PBF support DCR current sensing on both phases?
Yes, the LTC3784IUFD#PBF supports DCR current sensing on both phases via dedicated SENSE1+/– and SENSE2+/– pins, each with 2.3V–60V common-mode range and matched offset characteristics. The datasheet confirms identical electrical specifications and layout guidance for both channels, ensuring balanced current sharing in PolyPhase® configurations.
LTC3784IUFD#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)
LTC3784IUFD#PBF FAQ
1.How can I place an order for LTC3784IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784IUFD#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 LTC3784IUFD#PBF reliable?
The price and inventory of LTC3784IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784IUFD#PBF?
LTC3784IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784IUFD#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 LTC3784IUFD#PBF?
For technical support, including LTC3784IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784IUFD#PBF requirements.
6.How does Aetrix verify that LTC3784IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784IUFD#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 LTC3784IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784IUFD#PBF?
All LTC3784IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784IUFD#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 LTC3784IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3784IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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