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Analog Devices Inc. LTC3784MPGN#TRPBF
- Part No.:
- LTC3784MPGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784MPGN#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,463
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Product details
Overview
LTC3784MPGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-reliability, dual-phase synchronous boost controller for industrial and military power systems. It delivers up to 60V output from 4.5V–60V input (down to 2.3V post-startup), supports ±1% 1.200V reference accuracy, 75kHz–850kHz phase-lockable frequency, and RSENSE/DCR current sensing - enabling robust 24V/10A polyphase boost conversion in harsh environments.
For engineers reviewing the LTC3784MPGN#TRPBF datasheet, LTC3784MPGN#TRPBF pinout, LTC3784MPGN#TRPBF application, or LTC3784MPGN#TRPBF equivalent, this page provides verified specifications, thermal-grade package details (–55°C to 150°C), PolyPhase® timing architecture, and real-world design constraints including ILIM-selectable current sense thresholds (42/68/90 mV) and EXTVCC switchover at 4.8V.
Technical Context
The LTC3784MPGN#TRPBF implements constant-frequency current-mode control with two out-of-phase N-channel MOSFET drive channels. Its dual-stage architecture uses independent SENSE1+/– and SENSE2+/– inputs with matched ±12 mV threshold tolerance, and integrates a 5.4V INTVCC LDO powered either from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with automatic switchover at 4.8V.
It features three light-load operating modes selected via PLLIN/MODE: Burst Mode® (pin grounded), pulse-skipping (1.2V < V < INTVCC–1.3V), or forced continuous conduction (pin tied to INTVCC). Overvoltage protection behavior is configured by OVMODE pin state, and phase alignment across multiple controllers is managed through PHASMD and CLKOUT pins.
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 is powered from VOUT - enables battery-backed or wide-range industrial supply designs. |
| Output Voltage Range | Up to 60V regulated - supports high-voltage rail generation for industrial sensors, medical imaging subsystems, and avionics power conditioning. |
| Reference Voltage Accuracy | ±1% over –55°C to 150°C - ensures stable feedback loop performance across full military temperature range without external trimming. |
| Quiescent Current | 28µA in pulse-skipping/forced continuous mode; <4µA in shutdown - critical for low-power standby operation in remote or battery-powered systems. |
| Switching Frequency Range | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz - allows EMI optimization and inductor size reduction while maintaining tight synchronization in multi-controller stacks. |
| Current Sense Threshold Options | Selectable 42mV / 68mV / 90mV via ILIM pin (GND/FLOAT/INTVCC) - enables precise peak-current limiting with minimal I²R loss across diverse MOSFET RDS(on) values. |
| Package Thermal Resistance | θJA = 80°C/W (SSOP); exposed pad connected to PGND - validated for sustained operation at TJ = 150°C in convection-cooled industrial PCB layouts. |
Pinout & Package
Thermally enhanced 28-pin plastic SSOP package (LTC3784MPGN#TRPBF) with exposed pad connected to PGND. Rated for –55°C to 150°C junction temperature and qualified per MIL-PRF-38535 Class K requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 9) | Enable/Shutdown Control Input | Pulling below 1.28V disables control loops; below 0.7V reduces IQ to <4µA - enables system-level power sequencing with programmable hysteresis via external resistor divider. |
| SS (Pin 10) | Soft-Start Ramp Input | Internal 10µA current charges external capacitor to linearly ramp VFB reference from 0V to 1.2V - prevents inrush current and output overshoot during cold start. |
| VFB (Pin 13) | Error Amplifier Feedback Input | Compares resistive-divider-sensed output voltage against 1.200V reference - sets regulation point; ±5nA input bias minimizes divider error in high-impedance networks. |
| ITH (Pin 14) | Error Amplifier Output / Current Limit Threshold | Voltage sets peak inductor current trip point; transconductance of 2mmho enables stable Type II/III compensation with standard RC networks. |
| SENSE1+/–, SENSE2+/– (Pins 2,3,11,12,27,28) | Dual Independent Current Sense Inputs | Support RSENSE or DCR sensing with 2.3V–60V common-mode range; matching ≤±12mV ensures balanced phase current sharing in PolyPhase® operation. |
| ILIM (Pin 1) | Current Sense Threshold Selection | GND/FLOAT/INTVCC selects 42/68/90mV VSENSE(MAX) - configures current limit without external components, critical for fault tolerance in redundant power systems. |
| PLLIN/MODE (Pin 7) | Light-Load Mode & External Clock Input | Configures Burst Mode®, pulse-skipping, or forced continuous conduction; accepts external clock for phase synchronization across multiple LTC3784MPGN#TRPBF controllers. |
| OVMODE (Pin 15) | Overvoltage Protection Mode Select | GND enables OV latch-up (TG1/TG2 forced on); INTVCC disables OV latch and follows light-load mode - allows safe fail-safe or graceful degradation response. |
| PGOOD (Pin 28) | Open-Drain Power Good Indicator | Asserts low when VFB deviates >±10% for ≥45µs - provides reliable system monitoring without requiring external comparators or timers. |
| EXTVCC (Pin 21) | External Bias Supply Input | Switchover at 4.8V bypasses VBIAS LDO to reduce thermal load; must be decoupled and never floated - improves efficiency in high-input-voltage applications. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitance by ~50% and lowers RMS input ripple current vs single-phase - extends capacitor lifetime in 10+ year industrial deployments. |
| 100% duty cycle capability | Enables direct pass-through operation when VIN ≥ VOUT, eliminating switching losses and improving efficiency in variable-input applications like automotive battery systems. |
| Thermally rugged SSOP package | Qualified for –55°C to 150°C operation with θJA = 80°C/W - meets MIL-STD-883 screening requirements for aerospace and defense electronics. |
| Multi-mode light-load control | Burst Mode® achieves >85% efficiency at 10mA load; pulse-skipping maintains regulation without audible noise - essential for always-on sensor nodes and telemetry systems. |
| Robust gate driver architecture | 20ns rise/fall times with 1.2Ω pull-up/pull-down and 30ns dead-time control - ensures clean switching transitions with fast-recovery SiC and GaN MOSFETs. |
Applications
| Avionics Power Distribution | Industrial Motor Drive Bias Supply |
|---|---|
|
Use Scenario: Generating isolated 28V DC from 18–32V aircraft bus for flight control actuators and inertial measurement units. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing 24V/10A output with phase interleaving to suppress conducted EMI below DO-160 Section 20 Level A limits. Use Value: PolyPhase® operation cuts input capacitor RMS current by 70%, reducing size/weight while meeting MIL-STD-704F transient ride-through requirements. |
Use Scenario: Providing regulated 48V gate drive supply for IGBT modules in CNC machine spindle inverters operating in dusty, high-temperature factory environments. IC Role / Device Role / Timing Role: High-temperature-rated boost controller delivering stable 48V from fluctuating 24V DC bus, with EXTVCC bypass to minimize thermal stress on internal LDO. Use Value: –55°C to 150°C rating and 4.5V–60V input range ensure uninterrupted operation during ambient spikes and cold-soak startups. |
| Military Vehicle Battery Management | Medical Imaging X-Ray Generator |
|
Use Scenario: Stepping up 24V vehicle battery to 60V for radar transceiver RF amplifiers in tracked armored vehicles subjected to shock/vibration and extreme temperature cycling. IC Role / Device Role / Timing Role: Radiation-tolerant (per MIL-PRF-38535 Class K) boost controller with Burst Mode® enabling ultra-low standby power during vehicle sleep mode. Use Value: <4µA shutdown current extends battery life during 30-day patrol cycles; 100% duty cycle avoids dropout during engine cranking dips to 6V. |
Use Scenario: Generating precisely regulated 50V high-current supply for kV-level X-ray tube filament heating circuits in portable ultrasound and CT scanners. IC Role / Device Role / Timing Role: Precision reference (±1%) boost controller with RSENSE/DCR sensing ensuring accurate current delivery despite PCB trace resistance drift over time. Use Value: ±12mV matched current sense thresholds guarantee balanced phase current sharing, preventing thermal runaway in sealed medical 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 |
|---|---|---|---|
| LTC3784HUFD#TRPBF | Same die, 4mm × 5mm QFN package with θJA = 43°C/W; rated –40°C to 150°C (not –55°C). | Preferred where board space is constrained and thermal mass permits lower θJA; unsuitable for cryogenic storage or cold-start military platforms. | Select when PCB layout allows QFN mounting and ambient extremes do not reach –55°C. |
| LTC3784MPUFD#TRPBF | Same die, QFN package, identical –55°C to 150°C rating; differs only in package type and marking. | Offers same military-grade reliability with superior thermal performance (θJA = 43°C/W) but requires rework of land pattern and stencil. | Choose for new designs prioritizing thermal headroom over legacy SSOP compatibility. |
Compared with LTC3784MPGN#TRPBF, the HUFD variant trades wider cold-temperature capability for better thermal dissipation in compact layouts, while the MPUFD offers identical spec compliance with improved θJA - making SSOP selection optimal only when backward compatibility with existing 28-lead SSOP footprints is mandatory.
Availability
LTC3784MPGN#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power distribution, and military vehicle battery management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3784MPGN#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 product support, qualification, and manufacturing continuity for all LTC precision power ICs.
The LTC3784MPGN#TRPBF belongs to Linear's high-reliability PolyPhase® controller family, engineered specifically for demanding industrial, aerospace, and defense applications requiring wide input range, multi-phase efficiency, and extended temperature operation.
FAQ
What is the minimum input voltage for LTC3784MPGN#TRPBF after startup?
The LTC3784MPGN#TRPBF can operate down to 2.3V after startup when VBIAS is powered from the output rail (VOUT) or an auxiliary supply. This enables brownout recovery and operation from partially discharged batteries. The 4.5V–60V primary input range applies during initial startup and normal operation.
How does the ILIM pin affect current limiting in LTC3784MPGN#TRPBF?
The ILIM pin on LTC3784MPGN#TRPBF selects the peak current sense threshold: GND = 42mV, FLOAT = 68mV, INTVCC = 90mV. This directly sets the maximum allowable inductor current per phase, enabling precise overcurrent protection tailored to MOSFET RDS(on) and application fault margins without external components.
Can LTC3784MPGN#TRPBF synchronize to an external clock?
Yes, LTC3784MPGN#TRPBF supports external synchronization via the PLLIN/MODE pin. When driven with a clean CMOS clock signal, its internal PLL locks the rising edge of BG1 to the external clock's rising edge, enabling deterministic phase alignment across multiple LTC3784MPGN#TRPBF controllers in stacked PolyPhase® configurations.
What is the purpose of the OVMODE pin on LTC3784MPGN#TRPBF?
The OVMODE pin on LTC3784MPGN#TRPBF determines overvoltage protection behavior: GND enables latch-up (TG1/TG2 forced on until fault clears), while INTVCC disables latch-up and follows light-load mode. It also defines light-load operation when synchronized - grounding OVMODE forces continuous conduction during sync.
Does LTC3784MPGN#TRPBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3784MPGN#TRPBF supports both methods. Its SENSE+ pins provide bias current for DCR sensing networks, and the 2.3V–60V common-mode range accommodates high-side or low-side RSENSE placement. Matching ≤±12mV between SENSE1 and SENSE2 ensures balanced current sharing in dual-phase operation.
LTC3784MPGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3784MPGN#TRPBF FAQ
1.How can I place an order for LTC3784MPGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784MPGN#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 LTC3784MPGN#TRPBF reliable?
The price and inventory of LTC3784MPGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784MPGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3784MPGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784MPGN#TRPBF transactions.
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4.How is shipping managed for LTC3784MPGN#TRPBF?
LTC3784MPGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784MPGN#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 LTC3784MPGN#TRPBF?
For technical support, including LTC3784MPGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784MPGN#TRPBF requirements.
6.How does Aetrix verify that LTC3784MPGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3784MPGN#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 LTC3784MPGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3784MPGN#TRPBF?
All LTC3784MPGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784MPGN#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 LTC3784MPGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3784MPGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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