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Analog Devices Inc. DC2456A
- Part No.:
- DC2456A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC2456A.pdf
- Description:
- EVAL BOARD FOR LTC3779
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Product details
Overview
LTC3779 from Analog Devices is a 4-switch synchronous buck-boost controller IC operating from 4.5V to 150V input and delivering regulated output from 1.2V to 150V. It implements constant-frequency current-mode control up to 600kHz, supports input/output average current limiting, and features ±1% 1.2V reference with power-good monitoring - used in high-reliability automotive battery management and telecom rectifier systems.
For engineers reviewing the LTC3779 datasheet, LTC3779 pinout, LTC3779 application, or LTC3779 equivalent, key selection criteria include VIN/VOUT overlap capability, programmable DRVCC (6–10V), phase-lockable oscillator (50–600kHz), 38-pin FE38 TSSOP package with 150V-rated RUN/SENSE pins, and dual current-sense architecture for buck/boost/buck-boost transitions.
Technical Context
The LTC3779 employs a proprietary 4-switch single-inductor topology enabling seamless transition between buck, boost, and buck-boost modes without mode switching artifacts. Its dual current-sense inputs (SENSEP/SENSEN for valley/peak, IAVGSNSP/IAVGSNSN for average) support independent input or output current regulation - critical for battery charging and bidirectional power flow.
Control logic integrates a transconductance error amplifier (gm = 1.5 mmho), internal 20 µA frequency-setting current source, and a fully integrated PLL with on-die compensation. The RUN pin features 1.2 V turn-on threshold with 100 mV hysteresis and 150 V absolute max rating, while the DRVCC LDO supports three sourcing options: internal VIN LDO, external NDRV-driven NMOS LDO, or EXTVCC bypass - enabling robust operation across wide input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 150V - enables direct integration into 48V/72V/110V industrial and automotive battery systems without pre-regulation. |
| VOUT Range | 1.2V to 150V - supports wide-output applications including PoE++ PSE, telecom -48V backup, and HV battery charging. |
| Reference Voltage | ±1% at 1.2V - ensures ≤12mV output voltage error over temperature and line, critical for precision regulation. |
| Switching Frequency | 50kHz to 600kHz, PLL-synchronizable - allows EMI reduction via fixed-frequency noise spreading or external clock alignment. |
| Current Sense Thresholds | Buck valley: 70–110mV; Boost peak: 120–160mV; Avg: 47.5–52.5mV - enables accurate current limiting across all operating regions. |
| DRVCC Programmability | 6V to 10V in 1V steps via DRVSET pin - optimizes gate drive strength and efficiency for different MOSFET RDS(on) and Qg values. |
| Thermal Rating | Junction temp range –40°C to 150°C (H-grade); θJA = 28°C/W - supports high-power density designs with minimal heatsinking. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE38 variant), thermally enhanced with exposed PGND pad (Pin 39) requiring PCB soldering for rated electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1 / BG2 (1, 19) | Bottom gate drivers | Drive low-side N-MOSFET gates referenced to PGND; sink/source capability supports fast turn-off and shoot-through prevention. |
| TG1 / TG2 (37, 21) | Top gate drivers | Floating high-side drivers with BOOST1/BOOST2 supplies; swing = DRVCC + SW node voltage for full N-MOSFET enhancement. |
| SENSEP / SENSEN (11, 12) | Differential current sense inputs | Measure inductor current in valley mode (buck) or peak mode (boost); enable cycle-by-cycle current limiting and slope compensation. |
| IAVGSNSP / IAVGSNSN (26, 28) | Average current sense inputs | Support input or output average current regulation - essential for constant-current battery charging and load current limiting. |
| RUN (24) | Enable control input | 150V-rated input with 1.2V turn-on threshold and 100mV hysteresis; pull-up current increases at threshold for clean startup sequencing. |
| VINOV (2) | Input overvoltage lockout | Disables switching and disconnects VOUT from VIN when >1.28V; soft-start reset ensures graceful recovery after transients. |
| DRVSET (3) | DRVCC voltage programming | Selects DRVCC output: GND=6V, 1/4•V5=7V, float=8V, 3/4•V5=9V, V5=10V - matches gate drive needs to MOSFET characteristics. |
| PGOOD (18) | Open-drain fault indicator | Pulls low when VFB deviates >±10% from setpoint - provides system-level power rail monitoring and sequencing control. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost topology | Enables single-inductor operation with VIN above, below, or equal to VOUT - eliminates need for separate buck/boost converters or complex multiphase designs. |
| Programmable DRVCC (6–10V) | Optimizes gate drive voltage for specific MOSFETs, reducing conduction loss and improving efficiency at light and heavy loads. |
| Input/output average current limit | Provides precise constant-current regulation for battery charging, LED drivers, or overload protection - independent of operating mode. |
| No top-FET refresh noise | Eliminates gate-drive glitches during mode transitions, reducing EMI and simplifying filter design in noise-sensitive telecom and medical applications. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed and ensures true output isolation - required for safety-critical systems and redundant power architectures. |
Applications
| Automotive Battery Management | Telecom Rectifier Systems |
|---|---|
Use Scenario: 12V–48V bidirectional DC-DC converter in 48V mild-hybrid vehicles managing regenerative braking energy and starter/generator interface. IC Role / Device Role / Timing Role: Buck-boost controller managing seamless transitions between buck (battery charge) and boost (load supply) with input/output current regulation. Use Value: ±1% reference and 150V-rated RUN/SENSE pins ensure stable operation across cold-crank (4.5V) and load-dump (120V+) conditions. | Use Scenario: -48V telecom rectifier with hold-up capability, accepting wide-range AC-DC input (e.g., 90–305VAC) and delivering regulated -48V with battery backup switchover. IC Role / Device Role / Timing Role: Primary controller implementing constant-frequency current-mode regulation with programmable frequency synchronization to system clock. Use Value: 600kHz max switching frequency enables compact magnetics; EXTVCC support allows auxiliary bias for reliable startup under brownout. |
| Industrial HV Power Supplies | Medical Equipment Power Rails |
Use Scenario: 24V–110V input industrial power supply powering PLCs, motor drives, and sensors with adjustable 5V/12V/24V outputs. IC Role / Device Role / Timing Role: High-voltage synchronous buck-boost controller supporting wide-input operation and precise output regulation with power-good signaling. Use Value: 38-pin FE38 TSSOP package with exposed PGND pad delivers 28°C/W thermal resistance - sustains 10A+ output without forced air cooling. | Use Scenario: Isolated auxiliary power supply in MRI or CT scanners requiring ultra-stable 3.3V/5V rails with strict EMI limits and zero backfeed risk. IC Role / Device Role / Timing Role: Controller in non-isolated pre-regulator stage, leveraging pulse-skipping mode for low-noise standby operation and forced continuous mode for imaging pulses. Use Value: No top-FET refresh noise and VOUT disconnection during shutdown meet IEC 60601-1 leakage and safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780 | Lower voltage rating (60V max VIN/VOUT); no IAVGSNS inputs; fixed 5V DRVCC; 28-pin SSOP package. | Suitable only for ≤60V systems; lacks average current regulation and high-voltage robustness. | Select LTC3780 only for cost-sensitive, lower-voltage applications where average current control is unnecessary. |
| MPQ4333-AEC1 | Automotive-grade 36V max VIN; integrated MOSFETs; fixed 300kHz frequency; no PLL sync or DRVCC programming. | Targeted at infotainment and ADAS subsystems; not suitable for >36V or programmable-frequency designs. | Choose MPQ4333-AEC1 for AEC-Q100-compliant 12V/24V automotive modules requiring integrated FETs and simplified layout. |
Compared with LTC3780 and MPQ4333-AEC1, the LTC3779 uniquely supports 150V operation, dual current-sense architecture (peak/valley + average), and fully programmable DRVCC/PLL/frequency - making it the only option for high-reliability, wide-input, bidirectional power conversion in industrial and telecom infrastructure.
Availability
LTC3779 is available at Aetrix Electronics and suitable for automotive battery management, telecom rectifier systems, and industrial HV power supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across temperature extremes.
Supply support for LTC3779 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3779 belongs to ADI's Power by Linear™ high-voltage controller family, designed specifically for wide-input, high-efficiency, multi-mode DC-DC conversion in mission-critical infrastructure where reliability, precision, and thermal resilience are non-negotiable.
FAQ
What is the maximum input voltage supported by the LTC3779?
The LTC3779 supports an absolute maximum input voltage of 150V on the VIN pin, with operational range from 4.5V to 150V. This rating is confirmed in the Absolute Maximum Ratings table (Page 2) and enables direct use in 48V, 72V, and 110V battery and rectifier systems without external clamping or pre-regulation - a key differentiator versus lower-voltage controllers like the LTC3780.
Does the LTC3779 support both pulse-skipping and forced continuous conduction modes?
Yes, the LTC3779 supports both modes via the MODE pin: tying MODE to SGND enables forced continuous mode (constant frequency, optimal for EMI-sensitive applications), while tying MODE to V5 enables pulse-skipping mode (higher light-load efficiency). This dual-mode capability is explicitly documented in the FEATURES and PIN FUNCTIONS sections (Pages 1 and 11), and verified in typical performance curves (Figures G09–G14).
How is the DRVCC voltage programmed on the LTC3779?
The LTC3779 DRVCC voltage is programmed in 1V increments from 6V to 10V using the DRVSET pin: grounding DRVSET sets 6V; connecting to 1/4•V5 sets 7V; leaving floating sets 8V; connecting to 3/4•V5 sets 9V; connecting to V5 sets 10V. This is specified in the PIN FUNCTIONS section (Page 11) and validated in the Electrical Characteristics table (Page 4, DRVCC Regulation Voltage rows).
Can the LTC3779 regulate both input and output average current?
Yes, the LTC3779 supports independent input or output average current regulation using the IAVGSNSP and IAVGSNSN pins - a feature highlighted in the FEATURES list (Page 1) and detailed in the PIN FUNCTIONS section (Page 12). This capability is essential for battery charging, LED constant-current drivers, and overload protection, distinguishing it from standard buck-boost controllers lacking average current sensing.
What package type and thermal performance does the LTC3779 use?
The LTC3779 is offered in a 38-lead plastic TSSOP (FE38 variant) with an exposed PGND pad (Pin 39) that must be soldered to the PCB for rated performance. Its thermal resistance is θJA = 28°C/W, and it operates from –40°C to 150°C junction temperature (H-grade). These specifications are confirmed in the ORDER INFORMATION (Page 2) and ABSOLUTE MAXIMUM RATINGS (Page 2) sections.
DC2456A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Up or Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 48V
- Voltage - Input:
- 10A
- Regulator Topology:
- 16V ~ 120V
- Frequency - Switching:
- Buck-Boost
- Contents:
- 200kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LTC3779
DC2456A FAQ
1.How can I place an order for DC2456A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC2456A 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 DC2456A reliable?
The price and inventory of DC2456A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC2456A is usually 5 days.
3.What payment methods are accepted for DC2456A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC2456A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC2456A?
DC2456A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC2456A 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 DC2456A?
For technical support, including DC2456A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC2456A requirements.
6.How does Aetrix verify that DC2456A is sourced from the original manufacturer or authorized distributors?
All DC2456A 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 DC2456A meets industry standards.
7.What is the process for return or replacement of DC2456A?
All DC2456A units undergo pre-shipment inspection (PSI). If there is an issue with DC2456A, 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 DC2456A part is unused and in its original packaging.
Return procedure for DC2456A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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