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Analog Devices Inc. LTC3784IGN#PBF
- Part No.:
- LTC3784IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3784IGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
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Product details
Overview
LTC3784IGN#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 industrial 24V-to-48V telecom power supplies.
For engineers reviewing the LTC3784IGN#PBF datasheet, LTC3784IGN#PBF pinout, LTC3784IGN#PBF application, or LTC3784IGN#PBF equivalent, key selection criteria include its dual-phase synchronous boost architecture, programmable 50kHz–900kHz switching frequency, phase-lockable PLL interface, low 28μA quiescent current, and support for both RSENSE and inductor DCR current sensing in high-efficiency DC-DC conversion designs.
Technical Context
The LTC3784IGN#PBF implements constant-frequency current-mode control with two independent out-of-phase channels, each using peak-current limiting via ITH voltage feedback and reverse-current detection to prevent inductor current reversal. Its error amplifier compares VFB against a precision 1.200V reference, while the internal 5.4V INTVCC LDO powers gate drivers and logic either from VBIAS (4.5V–60V) or EXTVCC (4.5V–14V).
Phase synchronization is achieved through the PLLIN/MODE pin, enabling external clock locking from 75kHz–850kHz, while PHASMD selects inter-channel phase offset (0°, 90°, or 180°). The controller supports three light-load modes - Burst Mode®, pulse-skipping, or forced continuous - selected via PLLIN/MODE and OVMODE pin states, with soft-start controlled by SS pin ramping.
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 bus voltage compatibility. |
| Output Voltage Range | Up to 60V; regulated by external resistor divider on VFB - supports high-voltage industrial and telecom applications. |
| Reference Voltage | ±1% 1.200V at VFB - ensures tight output regulation across temperature and load. |
| Quiescent Current | 28μA in pulse-skipping/forced continuous mode - minimizes standby power loss in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - balances efficiency, size, and EMI in multi-phase designs. |
| Current Sensing | RSENSE or inductor DCR sensing with selectable 42mV/68mV/90mV thresholds via ILIM pin - enables flexible, low-loss current monitoring. |
| Duty Cycle | 100% capability for synchronous MOSFET - allows dropout operation near VIN = VOUT for improved light-load efficiency. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), thermally enhanced, rated for –40°C to 125°C operating junction temperature (θJA = 80°C/W).
| 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 precise EMI tuning. |
| PLLIN/MODE (Pin 4) | External sync input / light-load mode selector | Accepts external clock for PLL lock; configures Burst Mode®, pulse-skipping, or forced continuous operation - critical for system-level timing coordination. |
| SENSE1+/SENSE1– (Pins 2, 3) | Channel 1 current sense differential inputs | Supports RSENSE or DCR sensing with 2.3V–60V common-mode range - enables accurate peak-current control in high-side sensing configurations. |
| VFB (Pin 10) | Error amplifier feedback input | Compares output voltage (via resistive divider) to 1.200V reference - determines output regulation setpoint and loop stability. |
| ITH (Pin 11) | Error amplifier output / current limit threshold | Sets peak inductor current trip point; integrates compensation network - directly controls current-loop gain and transient response. |
| PGOOD (Pin 25) | Power good open-drain output | Asserts low when VFB deviates >±10% from 1.200V for ≥45μs - provides reliable system power sequencing and fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase® dual-channel operation | Reduces input/output capacitor requirements by ~50% and lowers RMS ripple current vs single-phase - enables smaller, cooler, lower-cost power stages. |
| Synchronous rectification control | Drives both top and bottom N-MOSFETs per phase with matched gate drive timing - eliminates diode losses and improves full-load efficiency beyond 95%. |
| 100% duty cycle capability | Allows TG1/TG2 to remain on continuously when needed - supports seamless transition into dropout and maintains regulation during low-VIN conditions. |
| Low IQ shutdown | Draws <4μA when RUN <0.7V - preserves battery life in standby or sleep modes of portable and remote equipment. |
| Flexible current sensing | Configurable 42/68/90mV current sense thresholds via ILIM pin state - accommodates diverse RSENSE values or DCR-based designs without external amplifiers. |
Applications
| Industrial Telecom Power Supply | Automotive ADAS Camera Power |
|---|---|
Use Scenario: Generating stable 48V rail from 12V vehicle battery for PoE-powered IP cameras and radar modules. IC Role / Device Role / Timing Role: Dual-phase synchronous boost controller managing interleaved switching, current sharing, and overvoltage protection. Use Value: Reduces input capacitance by 40% and thermal stress on MOSFETs versus single-phase solutions, meeting AEC-Q100 Grade 2 temperature requirements. | Use Scenario: Providing regulated 24V output from 9V–16V automotive battery for high-resolution camera image sensors. IC Role / Device Role / Timing Role: PolyPhase® boost controller with Burst Mode® operation to maintain efficiency at microamp-level standby currents. Use Value: Achieves >90% efficiency at 10mA load and <28μA quiescent current - extends battery runtime during parking surveillance mode. |
| Medical Imaging Power Module | Military Portable Radio Transmitter |
Use Scenario: Delivering low-noise 36V bias for CCD/CMOS sensor arrays in handheld ultrasound devices. IC Role / Device Role / Timing Role: Synchronous boost controller with phase-locked frequency and soft-start (SS pin) for EMI-controlled startup. Use Value: Interleaved operation cuts conducted EMI by 15dB and enables compact 4mm × 5mm QFN or SSOP layout - meets IEC 60601-1 EMC limits. | Use Scenario: Generating 28V RF power rail from 24V tactical battery in manpack radios with strict MIL-STD-810H shock/vibe tolerance. IC Role / Device Role / Timing Role: Robust boost controller with –40°C to 125°C rating, 65V abs max input, and overvoltage latch-off (OVMODE = GND). Use Value: Survives cold-cranking transients and sustains operation during 2.3V brownouts - ensures uninterrupted comms during field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781IGN#PBF | Single-phase only; 4.5V–60V input; no PLL sync; 100kHz–1MHz fixed frequency; lacks PHASMD/CLKOUT pins | Lower channel count reduces component count but increases input/output ripple and capacitor sizing | Select when cost-sensitive, space-constrained, or single-phase topology suffices - not suitable for PolyPhase® scaling. |
| MPQ4332GJ-AEC1-Z | Monolithic dual-phase 60V boost IC; integrated MOSFETs; 100kHz–600kHz; AEC-Q100 Grade 1; no RSENSE/DCR flexibility | Eliminates external FETs but fixes current limit and thermal design; limited to automotive temp range | Choose for automotive production where board area and qualification speed outweigh configurability needs. |
Compared with LTC3781IGN#PBF, the LTC3784IGN#PBF adds true PolyPhase® interleaving, PLL synchronization, and flexible current sensing - essential for high-power, low-EMI, and multi-rail systems. Versus MPQ4332GJ-AEC1-Z, it offers superior design adaptability across industrial, medical, and military environments due to external FET control and extended temperature support.
Availability
LTC3784IGN#PBF is available at Aetrix Electronics and suitable for industrial telecom power supplies, automotive ADAS camera modules, medical imaging subsystems, and military portable radio transmitters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3784IGN#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 reliability testing and long-term product support.
The LTC3784IGN#PBF belongs to Linear's PolyPhase® controller family, designed specifically for high-efficiency, multi-phase DC-DC boost conversion in demanding industrial, automotive, and medical applications where thermal performance, EMI control, and input voltage resilience are critical.
FAQ
What is the maximum input voltage rating for the LTC3784IGN#PBF?
The LTC3784IGN#PBF has an absolute maximum input voltage rating of 65V on the VBIAS pin, with recommended operating range of 4.5V to 60V. After startup, it can operate down to 2.3V if VBIAS is powered from the output rail - making it suitable for wide-input applications including automotive cold-crank and industrial 24V/48V systems. This rating is confirmed in the Absolute Maximum Ratings table on page 2 of the official datasheet.
Does the LTC3784IGN#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC3784IGN#PBF supports both RSENSE and inductor DCR current sensing through dedicated SENSE1+/SENSE1– and SENSE2+/SENSE2– pins with 2.3V–60V common-mode range. The peak current threshold is configurable to 42mV, 68mV, or 90mV via the ILIM pin state (GND/floating/INTVCC), enabling direct use of low-value sense resistors or copper traces without signal conditioning - a key feature verified in the Electrical Characteristics table (page 3).
What package type and temperature grade does the LTC3784IGN#PBF use?
The LTC3784IGN#PBF uses the 28-Lead Plastic SSOP (GN) package and is rated for –40°C to 125°C operating junction temperature. This is explicitly stated in the Order Information table (page 2) and confirmed by the "IGN" suffix per Linear/Analog Devices part numbering convention - distinguishing it from E-grade (0°C–70°C), H-grade (–40°C–150°C), and MP-grade (–55°C–150°C) variants.
How does the LTC3784IGN#PBF achieve phase synchronization across multiple controllers?
The LTC3784IGN#PBF achieves phase synchronization using the PLLIN/MODE pin to accept an external clock (75kHz–850kHz), which locks the rising edge of BG1 to the external clock via its internal phase-locked loop. The PHASMD pin then sets relative phase offsets (0°, 90°, or 180°) between BG1/BG2 and CLKOUT, enabling precise daisy-chaining of multiple LTC3784IGN#PBF units in 2-, 3-, 4-, 6-, or 12-phase configurations - as detailed in the Pin Functions section (page 8).
What is the purpose of the OVMODE pin on the LTC3784IGN#PBF?
The OVMODE pin on the LTC3784IGN#PBF selects overvoltage protection behavior and light-load mode during external synchronization. When tied to GND, it enables overvoltage protection (TG1/TG2 forced on until fault clears) and forces continuous conduction mode when PLL-synced. When tied to INTVCC, it disables overvoltage latching and enables pulse-skipping under sync - providing configurable safety and efficiency trade-offs validated in the Applications Information section (page 9).
LTC3784IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- 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-SSOP
LTC3784IGN#PBF FAQ
1.How can I place an order for LTC3784IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3784IGN#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 LTC3784IGN#PBF reliable?
The price and inventory of LTC3784IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3784IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3784IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3784IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3784IGN#PBF?
LTC3784IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3784IGN#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 LTC3784IGN#PBF?
For technical support, including LTC3784IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3784IGN#PBF requirements.
6.How does Aetrix verify that LTC3784IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3784IGN#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 LTC3784IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3784IGN#PBF?
All LTC3784IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3784IGN#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 LTC3784IGN#PBF part is unused and in its original packaging.
Return procedure for LTC3784IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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