My Inquiry
My Account
Analog Devices Inc. LTC3784MPUFD#PBF
- Part No.:
- LTC3784MPUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC3784MPUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3784MPUFD#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 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 - used in high-efficiency 24V/10A industrial boost converters.
For engineers reviewing the LTC3784MPUFD#PBF datasheet, LTC3784MPUFD#PBF pinout, LTC3784MPUFD#PBF application, or LTC3784MPUFD#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, 28-pin 4mm × 5mm QFN package with exposed thermal pad, phase-lockable 75kHz–850kHz frequency range, and dual-channel current-mode control for PolyPhase® operation.
Technical Context
The LTC3784MPUFD#PBF implements constant-frequency current-mode control with two independent PWM channels operating 180° out-of-phase. Its error amplifier compares VFB against a precision 1.200V reference, while ITH sets peak inductor current via external compensation. The internal 5.4V LDO powers gate drivers from either VBIAS (4.5V–60V) or EXTVCC (4.5V–14V), with automatic switchover at ~4.8V.
It supports three light-load modes selected via PLLIN/MODE: Burst Mode® (pin grounded), pulse-skipping (1.2V < voltage < INTVCC–1.3V), or forced continuous conduction (pin tied to INTVCC). Overvoltage protection behavior is configured by OVMODE, and phase alignment across multiple controllers is managed via PHASMD and CLKOUT pins.
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 wide battery and industrial bus compatibility. |
| Output Voltage Range | Up to 60V; regulated via external resistive divider on VFB - supports high-voltage industrial and medical power rails. |
| Reference Voltage Accuracy | ±1% (1.188V–1.212V) over –55°C to 150°C - ensures stable output regulation across full military-grade temperature range. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode; <4μA in shutdown - critical for low-power standby in remote or battery-backed systems. |
| Switching Frequency Range | Programmable 50kHz–900kHz or phase-locked 75kHz–850kHz - allows EMI optimization and inductor size reduction in space-constrained designs. |
| Current Sense Threshold | Selectable 42mV/68mV/90mV via ILIM pin (GND/floating/INTVCC) - enables precise peak-current limiting with RSENSE or DCR sensing. |
| Thermal Performance | θJA = 43°C/W (QFN package); exposed pad must be soldered to GND - supports high-power operation without external heatsink in compact layouts. |
Pinout & Package
28-lead (4mm × 5mm) plastic QFN package with exposed thermal pad (Pin 29 = GND), rated for –55°C to 150°C junction temperature. Thermally enhanced layout requires direct PCB ground connection to the exposed pad for rated θJA = 43°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; DC voltage or tie to INTVCC/GND selects fixed frequencies - enables EMI tuning and layout-driven frequency selection. |
| PLLIN/MODE (Pin 4) | Light-load mode & sync input | Ground = Burst Mode®; INTVCC = forced continuous; mid-voltage = pulse-skipping; external clock = PLL sync - determines efficiency vs. noise trade-off at light loads. |
| SENSE1+/SENSE1– (Pins 2,3) | Channel 1 current sense inputs | Differential inputs with 2.3V–60V common-mode range - supports high-side RSENSE or inductor DCR sensing without level-shifting. |
| VFB (Pin 13) | Feedback voltage input | Compares output voltage (via resistor divider) to 1.200V reference - closed-loop regulation point for output accuracy and stability. |
| ITH (Pin 14) | Error amplifier output & current limit threshold | Voltage sets peak inductor current; also serves as compensation node - integrates loop dynamics and current protection in one node. |
| PGOOD (Pin 28) | Power-good open-drain output | Asserts low when VFB deviates >±10% for ≥45μs - provides system-level fault signaling for downstream logic or sequencing. |
| Exposed Pad (Pin 29) | Thermal & electrical ground | Mandatory GND connection for thermal dissipation and signal integrity - failure to solder causes thermal derating and potential instability. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitor requirements by ~50% and lowers RMS ripple current - enables smaller, cooler, lower-cost power stages. |
| Synchronous rectification support | Drives both top and bottom N-MOSFETs with matched gate drive timing (30ns dead-time) - eliminates body-diode conduction loss for >95% efficiency at full load. |
| Wide VIN with ultra-low IQ | 28μA quiescent current over full –55°C to 150°C range - extends battery life in always-on industrial sensors and avionics monitoring systems. |
| Robust overvoltage handling | OVMODE-selectable response: TG1/TG2 forced-on (OVMODE = GND) or normal regulation (OVMODE = INTVCC) - prevents catastrophic overvoltage in fault conditions. |
| Flexible bias architecture | Auto-switching between VBIAS and EXTVCC LDOs (switchover at 4.8V) - reduces heat generation when auxiliary 5V rail is available, improving system thermal margin. |
Applications
| Industrial Motor Drives | Avionics Power Conversion |
|---|---|
Use Scenario: Boosting 24V aircraft bus to 48V for actuator control electronics in fly-by-wire systems. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing 2× parallel inductor paths with phase interleaving to suppress conducted EMI. Use Value: 43°C/W thermal resistance and –55°C to 150°C rating ensure reliable operation in uncooled avionics enclosures under vibration and thermal cycling. | Use Scenario: Generating isolated 60V bias for high-side gate drivers in industrial servo inverters. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated 60V output with ±1% reference accuracy and programmable soft-start. Use Value: 100% duty cycle capability and RSENSE/DCR sensing enable precise current limiting during motor stall conditions without external op-amps. |
| Medical Imaging Power Supplies | Military Radar Transmitter Bias |
Use Scenario: Providing stable 40V/5A power to X-ray detector front-end ASICs requiring low-noise, low-ripple supply. IC Role / Device Role / Timing Role: PolyPhase® controller operating at 500kHz with synchronized clocks to minimize beat-frequency noise in analog signal chains. Use Value: Burst Mode® operation achieves <10mW no-load loss, preserving battery runtime during standby in portable imaging devices. | Use Scenario: Generating 55V bias for GaN HEMT gate drivers in pulsed radar transmitters with strict thermal constraints. IC Role / Device Role / Timing Role: Synchronous boost controller with EXTVCC-powered INTVCC to eliminate VBIAS LDO losses during high-duty-cycle pulses. Use Value: 75kHz–850kHz PLL synchronization allows precise timing alignment with radar master clock, reducing jitter-induced spectral spreading. |
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#PBF | Same functionality and pinout; rated for –40°C to 150°C (vs. –55°C to 150°C) | Lacks extended low-temperature qualification for cryogenic or arctic-deployed systems | Select when full military-grade cold start is not required and cost optimization is prioritized. |
| LTC3784MPGN#PBF | Identical electrical specs and temperature range; uses 28-lead SSOP package (80°C/W θJA vs. 43°C/W) | Higher thermal resistance limits power density; larger footprint increases PCB area | Select only if QFN assembly is unavailable or legacy SSOP footprint must be maintained. |
Compared with LTC3784HUFD#PBF, the LTC3784MPUFD#PBF adds guaranteed operation at –55°C for extreme-environment deployments; compared with LTC3784MPGN#PBF, it delivers 46% lower thermal resistance in the same pin count, enabling higher output power in compact enclosures.
Availability
LTC3784MPUFD#PBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power conversion, medical imaging supplies, military radar transmitters, and high-reliability embedded systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3784MPUFD#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, reliability, and ruggedized design for demanding applications.
The LTC3784 product line delivers PolyPhase® synchronous boost controllers optimized for high-efficiency, high-voltage DC-DC conversion in aerospace, defense, industrial automation, and medical equipment where thermal resilience and long-term parametric stability are critical.
FAQ
What is the minimum input voltage for LTC3784MPUFD#PBF after startup?
The LTC3784MPUFD#PBF operates down to 2.3V after startup when VBIAS is powered from the output of the boost converter or another auxiliary supply. This enables brownout recovery and operation from partially discharged batteries. During initial startup, however, the minimum input remains 4.5V to ensure proper VBIAS LDO regulation and gate driver functionality.
How does the ILIM pin configure current sensing thresholds on LTC3784MPUFD#PBF?
The ILIM pin on LTC3784MPUFD#PBF selects the maximum current sense threshold: tying to GND sets 42mV, leaving floating sets 68mV, and connecting to INTVCC sets 90mV. These values correspond to peak inductor current limits when using RSENSE or DCR sensing, and matching between SENSE1 and SENSE2 channels is within ±9mV across the full temperature range.
Can LTC3784MPUFD#PBF synchronize to an external clock, and what is the valid frequency range?
Yes, LTC3784MPUFD#PBF supports external synchronization via the PLLIN/MODE pin, with a valid input clock range of 75kHz to 850kHz. The internal PLL locks the rising edge of BG1 to the external clock's rising edge, enabling precise phase alignment across multiple controllers in multiphase systems without requiring additional timing circuitry.
What is the purpose of the EXTVCC pin on LTC3784MPUFD#PBF, and how should it be used?
The EXTVCC pin on LTC3784MPUFD#PBF provides an alternative input to the internal 5.4V LDO that powers gate drivers and control circuits. When EXTVCC exceeds ~4.8V, it disables the VBIAS LDO and powers INTVCC directly - reducing power dissipation and heat generation when a clean 5V auxiliary supply is available, especially beneficial in thermally constrained high-power designs.
Does LTC3784MPUFD#PBF support both RSENSE and inductor DCR current sensing?
Yes, LTC3784MPUFD#PBF supports both methods: RSENSE sensing uses dedicated SENSE+ and SENSE– pins with 2.3V–60V common-mode range, while DCR sensing leverages the same pins with optional RC network filtering. The current comparator's ±9mV matching and 42mV/68mV/90mV selectable thresholds accommodate both approaches without external amplification.
LTC3784MPUFD#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC3784MPUFD#PBF FAQ
1.How can I place an order for LTC3784MPUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784MPUFD#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 LTC3784MPUFD#PBF reliable?
The price and inventory of LTC3784MPUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784MPUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784MPUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784MPUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784MPUFD#PBF?
LTC3784MPUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784MPUFD#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 LTC3784MPUFD#PBF?
For technical support, including LTC3784MPUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784MPUFD#PBF requirements.
6.How does Aetrix verify that LTC3784MPUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784MPUFD#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 LTC3784MPUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784MPUFD#PBF?
All LTC3784MPUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784MPUFD#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 LTC3784MPUFD#PBF part is unused and in its original packaging.
Return procedure for LTC3784MPUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3784MPUFD#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
