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Analog Devices Inc. LTC3779EFE#PBF
- Part No.:
- LTC3779EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779EFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
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Product details
Overview
LTC3779EFE#PBF from Analog Devices is a 4-switch synchronous buck-boost DC/DC 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 with phase-lockable switching up to 600kHz, supports input/output average current limiting, and features a precision ±1% 1.2V reference and power-good indicator - ideal for high-voltage automotive battery systems and telecom power supplies.
For engineers reviewing the LTC3779EFE#PBF datasheet, LTC3779EFE#PBF pinout, LTC3779EFE#PBF application, or LTC3779EFE#PBF equivalent, key selection criteria include its 150V absolute maximum VIN/VOUT rating, programmable DRVCC (6–10V), dual current-sense architecture (peak/valley + average), seamless buck-boost transition, and thermally enhanced FE38 TSSOP package rated for –40°C to 125°C operation.
Technical Context
The LTC3779EFE#PBF uses a proprietary 4-switch single-inductor buck-boost topology with valley-current mode in buck region and peak-current mode in boost region, enabling continuous conduction across VIN = VOUT crossover. Its dual-loop architecture integrates an inner current loop (via ITH) and outer voltage loop (via VFB), with independent input/output average current sensing via IAVGSNSP/IAVGSNSN pins.
Control logic includes programmable MODE pin selection between forced continuous conduction (fixed frequency, noise-sensitive) and pulse-skipping (light-load efficiency), PLLIN synchronization (50–600kHz), and robust protection: VIN overvoltage lockout (1.28V threshold), RUN pin enable with hysteresis, current foldback, and VOUT disconnection during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 150V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| VOUT Range | 1.2V to 150V - enables single-stage conversion from 12V/24V/48V batteries to 48V/96V/120V bus rails. |
| Reference Voltage | 1.2V ±1% - ensures tight output regulation accuracy across temperature and load. |
| Switching Frequency | 50kHz to 600kHz, phase-lockable - allows EMI control and layout optimization for high-density designs. |
| DRVCC Programmability | 6V to 10V in 1V steps via DRVSET pin - optimizes gate drive strength and MOSFET RDS(on) trade-off. |
| Current Sensing | Dual-path: valley/peak (SENSEP/SENSEN) + average (IAVGSNSP/IAVGSNSN) - enables precise charge/discharge control in bidirectional applications. |
| Package | 38-lead FE38 TSSOP with exposed PGND pad - provides 28°C/W θJA thermal resistance for high-power density layouts. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE38), 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 N-channel MOSFET sources to PGND; support synchronous rectification for up to 99% efficiency. |
| TG1, TG2 (37, 21) | Top gate drivers | Floating high-side outputs referenced to SW1/SW2; swing up to VIN + DRVCC for full N-MOSFET utilization. |
| SENSEP, SENSEN (11, 12) | Current sense differential inputs | Set peak/valley current limit (70–160mV range); enable cycle-by-cycle current protection in buck/boost modes. |
| IAVGSNSP, IAVGSNSN (26, 28) | Average current sense inputs | Enable input/output average current regulation - critical for battery charging and bidirectional power flow. |
| DRVSET (3) | DRVCC voltage programming | Selects DRVCC output: 6V (GND), 7V (¼V5), 8V (float), 9V (¾V5), or 10V (V5) - tailors gate drive for low-RDS(on) or low-Qg MOSFETs. |
| RUN (24) | Enable control input | 1.2V turn-on threshold with 100mV hysteresis; 150V-rated for direct connection to high-voltage rails. |
| PGOOD (18) | Open-drain fault indicator | Pulls low when VFB deviates >±10% from 1.2V - provides system-level power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost topology | Single-inductor architecture eliminates need for separate buck and boost converters - reduces BOM count and board area. |
| Seamless buck-boost transition | No discontinuity or regulation loss at VIN = VOUT crossover - essential for stable operation in variable-input battery systems. |
| Programmable DRVCC (6–10V) | Optimizes gate drive voltage for specific MOSFETs - balances switching losses, conduction losses, and driver efficiency. |
| Input/output average current sensing | Enables precise constant-current regulation for battery charging, LED drivers, and regenerative energy recovery. |
| Thermally enhanced FE38 package | Exposed PGND pad and 28°C/W θJA allow sustained 10A+ output current in compact industrial layouts. |
| VIN overvoltage lockout | 1.28V threshold on VINOV pin with 50mV hysteresis - protects downstream circuitry during transients without external components. |
Applications
| Automotive Battery Management | Telecom 48V Intermediate Bus |
|---|---|
|
Use Scenario: Regulating 12V–60V lead-acid or LiFePO₄ battery packs to stable 48V for vehicle infotainment and ADAS modules. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow and maintaining output during engine cranking dips. Use Value: 150V absolute max rating withstands load-dump transients; average current sensing enables accurate state-of-charge monitoring. |
Use Scenario: Converting 36V–75V telecom rectified input to tightly regulated 48V for distributed power architecture. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller supporting phase-locked operation to reduce EMI in dense rack-mounted systems. Use Value: 99% peak efficiency minimizes thermal stress; ±1% reference ensures compliance with ITU-T L.1200 voltage tolerance specs. |
| Industrial HV Power Supplies | Medical Equipment Power Conversion |
|
Use Scenario: Generating isolated 24V/48V rails from unregulated 100V–120V AC-derived DC bus in factory automation controllers. IC Role / Device Role / Timing Role: Primary non-isolated regulator preceding isolation stage; handles wide input variation without derating. Use Value: 4.5V–150V input range eliminates need for auxiliary bias supplies; soft-start (SS pin) prevents inrush into large capacitive loads. |
Use Scenario: Providing stable, low-noise 5V/12V/24V outputs from 24V–48V hospital-grade battery backup systems. IC Role / Device Role / Timing Role: Critical power controller with PGOOD signaling for system health monitoring and fail-safe shutdown. Use Value: Forced continuous mode eliminates light-load frequency modulation; power-good delay (125µs) ensures reliable sequencing with FPGA/CPU power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-switch buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#PBF | Lower 60V max VIN/VOUT rating; no IAVGSNSP/IAVGSNSN average current sense; fixed 7.5V DRVCC. | Suitable only for ≤60V systems; lacks bidirectional current control capability. | Select when cost sensitivity outweighs high-voltage and average-current requirements. |
| MPQ4333GLED-AEC1-Z | Automotive-grade 65V max rating; integrated MOSFETs; no average current sensing; 2.5A max output. | Targeted at lower-power automotive infotainment; not suitable for >65V or programmable DRVCC needs. | Choose for AEC-Q100-compliant, space-constrained designs where integration trumps flexibility. |
Compared with LTC3779EFE#PBF, LTC3789EFE#PBF sacrifices 150V capability and average current sensing for lower cost, while MPQ4333GLED-AEC1-Z trades programmability and voltage range for AEC-Q100 qualification and monolithic integration - making LTC3779EFE#PBF uniquely suited for high-reliability, wide-input, bidirectional power applications.
Availability
LTC3779EFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, telecom intermediate bus, and industrial HV power supply designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3779EFE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3779EFE#PBF belongs to ADI's Power by Linear™ high-voltage controller family, designed specifically for robust, efficient, and flexible DC/DC conversion in harsh environments with extreme input/output voltage ranges.
FAQ
What is the maximum input voltage rating for the LTC3779EFE#PBF?
The LTC3779EFE#PBF has an absolute maximum input voltage rating of 150V on the VIN pin, and its BOOST1/BOOST2, SW1/SW2, and RUN pins are also rated to 150V. This enables direct interface with high-voltage battery stacks and telecom rectified inputs without external clamping or pre-regulation stages - a key differentiator versus lower-voltage controllers like the LTC3789EFE#PBF.
Does the LTC3779EFE#PBF support bidirectional current control?
Yes, the LTC3779EFE#PBF supports bidirectional current control via its dedicated IAVGSNSP and IAVGSNSN pins, which implement an input/output average current regulation loop. This feature enables precise constant-current operation for battery charging, regenerative braking, and LED driver applications - unlike standard buck-boost controllers that only provide voltage regulation.
How is the switching frequency programmed on the LTC3779EFE#PBF?
The LTC3779EFE#PBF switching frequency is set using a resistor between the FREQ pin and SGND, leveraging an internal 20µA current source. With RFREQ = 68.5kΩ, the nominal frequency is 250kHz; values from 20kΩ (50kHz) to 135kΩ (550kHz) yield the full 50–600kHz range. The PLLIN pin also allows external clock synchronization for EMI reduction in noise-sensitive systems.
What is the purpose of the DRVSET pin on the LTC3779EFE#PBF?
The DRVSET pin on the LTC3779EFE#PBF programs the DRVCC LDO output voltage in 1V increments from 6V to 10V - by tying it to SGND (6V), ¼V5 (7V), floating (8V), ¾V5 (9V), or V5 (10V). This allows designers to optimize gate drive strength for specific MOSFETs, balancing switching speed, conduction losses, and driver efficiency without external components.
Can the LTC3779EFE#PBF operate in forced continuous conduction mode?
Yes, the LTC3779EFE#PBF supports forced continuous conduction mode (CCM) by pulling the MODE pin to SGND or below 0.8V. In this mode, the controller maintains a fixed switching frequency regardless of load, eliminating audible noise and frequency modulation artifacts - critical for EMC-sensitive applications such as medical imaging equipment and precision instrumentation.
LTC3779EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 150V
- Frequency - Switching:
- 50kHz ~ 600kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3779EFE#PBF FAQ
1.How can I place an order for LTC3779EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779EFE#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 LTC3779EFE#PBF reliable?
The price and inventory of LTC3779EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3779EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779EFE#PBF?
LTC3779EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779EFE#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 LTC3779EFE#PBF?
For technical support, including LTC3779EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779EFE#PBF requirements.
6.How does Aetrix verify that LTC3779EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3779EFE#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 LTC3779EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3779EFE#PBF?
All LTC3779EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779EFE#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 LTC3779EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3779EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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