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Analog Devices Inc. LTC3784MPUFD#TRPBF
- Part No.:
- LTC3784MPUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784MPUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,005
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Product details
Overview
LTC3784MPUFD#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance PolyPhase® synchronous boost controller driving two N-channel MOSFET stages out-of-phase to reduce input/output capacitance and power supply noise. It operates from 4.5V–60V input (down to 2.3V post-startup), delivers up to 60V output, features ±1% 1.200V reference, RSENSE/DCR current sensing, and 100% duty cycle capability - deployed in rugged industrial and military DC-DC power conversion systems.
For engineers reviewing the LTC3784MPUFD#TRPBF datasheet, LTC3784MPUFD#TRPBF pinout, LTC3784MPUFD#TRPBF application, or LTC3784MPUFD#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, phase-lockable 75kHz–850kHz frequency range, dual-channel current-mode control with independent SENSE+/- inputs, and thermally enhanced 4mm × 5mm QFN package with exposed ground pad.
Technical Context
The LTC3784MPUFD#TRPBF implements constant-frequency current-mode control across two out-of-phase channels, each using independent peak-current sensing via dedicated SENSE1+/– and SENSE2+/– pins with programmable thresholds (42–110mV). Its internal PLL enables synchronization to external clocks while maintaining precise phase relationships between BG1/BG2 and CLKOUT outputs for scalable multiphase operation (2-/3-/4-/6-/12-phase).
Control logic integrates a 5.4V INTVCC LDO powered either from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with automatic switchover at ~4.8V. The RUN pin provides dual-threshold shutdown (1.28V for control loop disable, 0.7V for full quiescent reduction to <4µA), and SS pin enables linear soft-start via external capacitor charging at 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V continuous; operates down to 2.3V after startup when VBIAS is powered from VOUT - supports wide battery chemistries and legacy industrial rails. |
| Output Voltage Range | Up to 60V - enables high-voltage bus generation for LED drivers, RF amplifiers, and test equipment. |
| Reference Voltage Accuracy | ±1% (1.188V–1.212V) over –55°C to 150°C - ensures stable regulation under extreme thermal stress without external trimming. |
| Quiescent Current | 28µA typical in pulse-skipping mode; <4µA in shutdown - critical for always-on systems with standby power budgets. |
| Switching Frequency Range | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - balances efficiency, EMI, and magnetics size across diverse load profiles. |
| Current Sense Threshold | Configurable 42mV/75mV/100mV via ILIM pin - allows optimization of sense resistor power loss vs. noise immunity in high-current designs. |
| Package Thermal Resistance | θJA = 43°C/W (QFN UFD) - enables >200W operation with moderate heatsinking in compact layouts. |
Pinout & Package
Thermally enhanced 28-pin 4mm × 5mm plastic QFN (UFD) with exposed ground pad (Pin 29), rated for –55°C to 150°C junction temperature. Exposed pad must be soldered to PCB ground plane for specified thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1, 4) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or GND/INTVCC selects fixed frequencies - enables EMI tuning and layout-driven frequency selection. |
| PLLIN/MODE (Pin 4, 7) | External sync input / light-load mode selector | Accepts external clock for phase locking; configures Burst Mode®, pulse-skipping, or forced continuous conduction - adapts efficiency strategy to dynamic load demands. |
| SENSE1+/–, SENSE2+/– (Pins 2, 3, 11, 12, 27, 28) | Dual independent current sense inputs | Supports RSENSE or DCR sensing per channel with 2.3V–60V common-mode range - eliminates need for level-shifting in high-side sensing topologies. |
| TG1/TG2, BG1/BG2 (Pins 17, 19, 26, 24) | Top/bottom gate drive outputs | Drives N-channel MOSFET gates with 1.2Ω pull-up/down and <30ns dead-time - ensures robust synchronous rectification without external drivers. |
| VBIAS (Pin 20) | Main bias supply input | Accepts 4.5V–60V input; powers internal LDO generating INTVCC - enables direct connection to input rail or boosted output for self-biasing. |
| PGND (Pin 19) | Power ground return | Low-impedance return path for bottom MOSFET sources and bulk capacitors - separates high-di/dt power currents from signal ground to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® multiphase operation | Reduces RMS input/output ripple current by √N, enabling smaller capacitors and inductors - cuts BOM cost and board area in high-power boost converters. |
| Synchronous rectification control | 100% duty cycle capability and precise gate timing eliminate body diode conduction losses - improves full-load efficiency by 3–5% versus diode-based designs. |
| Wide-input, ultra-low-IQ operation | 28µA quiescent current with 4.5V–60V input range - sustains regulation in battery-powered systems during deep sleep without auxiliary regulators. |
| Robust thermal and environmental rating | –55°C to 150°C operating junction temperature, qualified per MIL-STD-883 - meets requirements for avionics, downhole tools, and defense electronics. |
| Flexible current sensing architecture | RSENSE or inductor DCR sensing with matched 12mV threshold tolerance between channels - simplifies design across varying current ranges and accuracy needs. |
Applications
| Industrial Motor Drives | Military Radar Power Supplies |
|---|---|
Use Scenario: Boosting 24V/48V battery or bus voltage to 60V for gate drivers and analog front-ends in servo motor controllers. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing 200W+ power delivery with tight output regulation and low EMI. Use Value: PolyPhase operation reduces input capacitor RMS current by 70%, allowing use of smaller 1210-case ceramic arrays instead of bulky electrolytics. | Use Scenario: Generating stable 48V and 60V rails from 28V aircraft bus in radar transceiver modules requiring operation from –55°C to +125°C. IC Role / Device Role / Timing Role: High-reliability boost controller with extended temperature qualification and phase-lockable frequency for synchronized multi-module power systems. Use Value: –55°C to 150°C rating and 43°C/W θJA enable conduction-cooled operation without derating in sealed enclosures. |
| Medical Imaging X-Ray Generators | Automotive ADAS ECUs |
Use Scenario: Stepping up 12V vehicle battery to 60V for high-voltage bias supplies in portable ultrasound and digital radiography detectors. IC Role / Device Role / Timing Role: Precision boost controller delivering ±1% output stability with fast transient response to pulsed X-ray loads. Use Value: ±1% 1.200V reference and 45µs PGOOD delay ensure consistent detector biasing across temperature and line variations. | Use Scenario: Providing isolated 24V/48V rails for LiDAR laser diodes and radar MMICs in autonomous driving ECUs subject to automotive transients. IC Role / Device Role / Timing Role: Robust boost controller with 65V absolute max input and integrated OVP protection for harsh automotive environments. Use Value: 65V abs max on BOOST/SW pins and OVMODE-configurable overvoltage response prevent latch-up during load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3784HUFD#TRPBF | Same silicon, rated for –40°C to 150°C (vs. –55°C to 150°C); lower cold-temperature guarantee | Not suitable for cryogenic industrial or aerospace deployments requiring sub–40°C startup | Select LTC3784MPUFD#TRPBF when guaranteed operation below –40°C is required. |
| LTC3784IUFD#TRPBF | Same silicon, rated for –40°C to 125°C; higher production volume, lower cost | Insufficient for military or extended-temperature industrial applications | Choose LTC3784IUFD#TRPBF only for commercial/industrial designs within –40°C to 125°C ambient. |
Compared with LTC3784HUFD#TRPBF and LTC3784IUFD#TRPBF, the LTC3784MPUFD#TRPBF uniquely guarantees full functionality at –55°C - essential for arctic instrumentation, space-qualified subsystems, and high-reliability defense platforms where cold-start reliability is non-negotiable.
Availability
LTC3784MPUFD#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, military radar power supplies, medical imaging generators, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3784MPUFD#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 backward compatibility and technical support for all Linear power products.
The LTC3784MPUFD#TRPBF belongs to Linear's high-reliability PolyPhase® controller family, designed specifically for high-efficiency, high-power-density synchronous boost conversion in mission-critical industrial, military, and medical systems.
FAQ
What is the minimum input voltage for LTC3784MPUFD#TRPBF after startup?
The LTC3784MPUFD#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output rail (VOUT) rather than the input supply (VIN). This feature enables brownout recovery and operation from partially discharged batteries. Startup itself still requires ≥4.5V on VBIAS unless an auxiliary bias source is used.
How does the ILIM pin configure current sense thresholds on LTC3784MPUFD#TRPBF?
The ILIM pin on LTC3784MPUFD#TRPBF selects peak current sense voltage thresholds: grounded = 50mV, floating = 75mV, tied to INTVCC = 100mV. This directly scales the current limit setpoint for both channels without external resistors, enabling rapid adaptation to different MOSFET RDS(on) or sense resistor values while maintaining matched channel behavior.
Can LTC3784MPUFD#TRPBF synchronize to an external clock, and what is the supported frequency range?
Yes, LTC3784MPUFD#TRPBF supports external synchronization via the PLLIN/MODE pin across 75kHz to 850kHz. The internal PLL locks the rising edge of BG1 to the external clock's rising edge, enabling precise phase alignment in multi-controller systems. Frequency tolerance is ±10% of target; jitter performance is optimized for clean switching in noise-sensitive applications like radar and medical imaging.
What is the purpose of the EXTVCC pin on LTC3784MPUFD#TRPBF, and how should it be used?
The EXTVCC pin on LTC3784MPUFD#TRPBF provides an alternative power path for the 5.4V INTVCC LDO, activating automatically when voltage exceeds ~4.8V. This bypasses the VBIAS LDO, reducing power dissipation and heat generation - especially valuable in high-input-voltage applications (e.g., 48V systems) where VBIAS-to-INTVCC dropout would otherwise waste >1W. Leave unconnected or tie to GND if unused.
Does LTC3784MPUFD#TRPBF support multiphase configurations beyond two phases?
Yes, LTC3784MPUFD#TRPBF supports 2-, 3-, 4-, 6-, and 12-phase operation via daisy-chained CLKOUT outputs and PHASMD pin configuration. Each LTC3784MPUFD#TRPBF controls two phases; multiple units are synchronized using PLLIN/MODE and CLKOUT signals to distribute switching evenly - reducing input/output ripple and thermal stress in >500W boost converters.
LTC3784MPUFD#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3784MPUFD#TRPBF FAQ
1.How can I place an order for LTC3784MPUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784MPUFD#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 LTC3784MPUFD#TRPBF reliable?
The price and inventory of LTC3784MPUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784MPUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784MPUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784MPUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784MPUFD#TRPBF?
LTC3784MPUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784MPUFD#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 LTC3784MPUFD#TRPBF?
For technical support, including LTC3784MPUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784MPUFD#TRPBF requirements.
6.How does Aetrix verify that LTC3784MPUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784MPUFD#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 LTC3784MPUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784MPUFD#TRPBF?
All LTC3784MPUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784MPUFD#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 LTC3784MPUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784MPUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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