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Analog Devices Inc. LTC3779EFE#TRPBF
- Part No.:
- LTC3779EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
LTC3779EFE#TRPBF from Analog Devices is a 4-switch synchronous buck-boost DC/DC controller supporting input and output voltages from 4.5V to 150V, operating in continuous conduction mode with ±1% 1.2V reference accuracy and phase-lockable switching frequency up to 600kHz. It enables seamless VIN-above/VIN-below/VIN-equal-to-VOUT conversion for high-voltage battery systems and telecom power supplies.
For engineers reviewing the LTC3779EFE#TRPBF datasheet, LTC3779EFE#TRPBF pinout, LTC3779EFE#TRPBF application, or LTC3779EFE#TRPBF equivalent, key selection criteria include its 150V absolute maximum input rating, programmable DRVCC (6V–10V), dual current-sense architecture (peak/valley + average), forced continuous/pulse-skipping mode control, and thermally enhanced FE38 TSSOP package with exposed PGND pad.
Technical Context
The LTC3779EFE#TRPBF implements a constant-frequency current-mode control architecture with independent peak/valley current sensing in buck/boost regions and an auxiliary input/output average current loop via IAVGSNSP/IAVGSNSN pins. Its proprietary 4-switch single-inductor topology eliminates reverse current at startup and disconnects VOUT from VIN during shutdown.
Control logic integrates a phase-locked loop (PLLIN), programmable oscillator (FREQ pin with 20µA current source), MODE-selectable operation (forced CCM or pulse-skipping), and dual LDO power paths: internal VIN/NDRV LDOs and external EXTVCC switchover. The RUN pin features 150V-rated enable with 100mV hysteresis and accurate 1.2V turn-on threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 150V - supports wide-input industrial, automotive, and telecom power rails without pre-regulation. |
| VOUT Range | 1.2V to 150V - enables flexible output regulation across buck, boost, and buck-boost transitions. |
| Reference Voltage | 1.2V ±1% - ensures precise output voltage setting with low load/line regulation (0.01–0.2%). |
| Switching Frequency | 50kHz to 600kHz - programmable via FREQ resistor or PLL-synchronized for EMI control. |
| DRVCC Range | 6V to 10V - selectable in 1V steps via DRVSET pin to optimize gate drive efficiency and MOSFET RDS(on) utilization. |
| Current Sensing | Three independent loops: valley (buck), peak (boost), and average (input/output) - enables robust overcurrent protection and battery charge control. |
| Package | 38-lead FE38 TSSOP with exposed PGND pad - rated for 150°C junction temperature and optimized for high-voltage isolation and thermal dissipation. |
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. Operating junction temperature range: –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (24) | Enable control input | 150V-rated enable with 1.2V turn-on threshold and 100mV hysteresis; 2.5µA pull-up; ties directly to VIN for always-on operation. |
| VIN (34) | Main supply input | Primary high-voltage input rail (4.5V–150V); bypass capacitor required between VIN and PGND. |
| PGND (39) | Driver power ground | Exposed pad; must be soldered to PCB ground plane for thermal management and low-impedance return path for gate drivers and sense resistors. |
| TG1/TG2 (37/21) | Top gate drivers | Floating high-side N-channel MOSFET drivers with swing = DRVCC + SW node voltage; no refresh noise in buck/boost modes. |
| BG1/BG2 (1/19) | Bottom gate drivers | Low-side N-channel MOSFET drivers referenced to PGND; integrated pull-down for safe shutdown state. |
| SENSEP/SENSEN (11/12) | Differential current sense inputs | Valley current sensing in buck region (70–110mV threshold), peak current sensing in boost region (120–160mV), enabling cycle-by-cycle protection. |
| IAVGSNSP/IAVGSNSN (26/28) | Average current sense inputs | Input/output average current monitoring (47.5–52.5mV threshold); shorted together and tied to V5 if unused. |
| VFB (10) | Feedback input | Connects to resistive divider from VOUT; error amplifier compares to 1.2V reference for output regulation. |
| ITH (13) | Error amplifier output | Controls current limit threshold and serves as compensation node for loop stability. |
| MODE (15) | Operating mode select | SGND = forced continuous mode (fixed frequency); V5 = pulse-skipping mode (light-load efficiency). |
| PLLIN (16) | External clock sync input | Accepts 50kHz–600kHz external clock; internal PLL locks oscillator without external components. |
| FREQ (17) | Oscillator programming | Resistor-to-SGND sets frequency via 20µA internal current source (e.g., 68.5kΩ = 250kHz typical). |
| PGOOD (18) | Power-good indicator | Open-drain output asserting low when VFB deviates >±10% from setpoint; 125µs delay ensures stable detection. |
| DRVSET (3) | DRVCC voltage programming | Selects DRVCC output: SGND=6V, 1/4•V5=7V, float=8V, 3/4•V5=9V, V5=10V - optimizes gate drive strength vs. MOSFET losses. |
| VINOV (2) | Input overvoltage lockout | Resistor-divider input; >1.28V disables switching, holds top FETs low/bottom FETs high, and maintains DRVCC/V5 regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor buck-boost topology | Enables seamless transition between buck, boost, and buck-boost modes without discontinuity or reverse current at startup. |
| Programmable DRVCC (6V–10V) | Optimizes gate drive voltage for diverse MOSFET RDS(on) and Qg requirements while minimizing driver losses. |
| Dual LDO power architecture | Supports three DRVCC sources: internal VIN LDO, external NDRV NMOS LDO (with charge pump), or EXTVCC switchover - critical for high-VIN efficiency. |
| Triple current-sense capability | Independent valley (buck), peak (boost), and average (IO/II) current loops provide comprehensive protection and battery charging control. |
| 150V-rated RUN and sense pins | Eliminates need for level-shifting circuitry in high-voltage applications such as 48V/96V/110V battery systems and PoH infrastructure. |
| No top-FET refresh noise | Eliminates gate-drive glitches during mode transitions, reducing EMI and improving signal integrity in noise-sensitive applications. |
Applications
| Automotive 48V Mild Hybrid Systems | Telecom 48V/54V Backup Power |
|---|---|
Use Scenario: Bidirectional power conversion between 48V battery and 12V subsystems during regenerative braking and engine start-stop cycles. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional energy flow with seamless mode transitions and reverse-current blocking. Use Value: Enables >96% efficiency across 20V–60V input range and 12V–56V output range while meeting ASIL-B functional safety requirements via precise current limiting and PGOOD monitoring. |
Use Scenario: Maintaining stable 48V output from fluctuating -48V telecom rectifier inputs during AC mains failure or brownouts. IC Role / Device Role / Timing Role: High-voltage buck-boost controller regulating output under wide input transients (20V–120V) with programmable OVP and soft-start ramp control. Use Value: Delivers 10A continuous output with <125µs PGOOD response and VINOV-triggered graceful recovery, ensuring uninterrupted network equipment operation. |
| Industrial Battery Energy Storage | Medical Imaging Power Supplies |
Use Scenario: Charging/discharging Li-ion or LFP battery stacks (24V–100V) in grid-tied storage inverters with active balancing and state-of-charge control. IC Role / Device Role / Timing Role: Current-mode controller implementing input/output average current limiting and precision 1.2V reference for battery voltage regulation. Use Value: Supports ±1% output accuracy and programmable current foldback (via ITH) to prevent MOSFET thermal runaway during short-circuit events. |
Use Scenario: Generating isolated high-current bias rails (e.g., ±15V, +48V) for CT/MRI detector arrays requiring ultra-low noise and fast transient response. IC Role / Device Role / Timing Role: Synchronous buck-boost controller operating in forced continuous mode synchronized to system clock via PLLIN pin. Use Value: Achieves <600kHz fixed-frequency operation with <200ns gate driver delays and no top-FET refresh noise, minimizing conducted EMI in sensitive analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#TRPBF | Lower 60V max VIN/VOUT rating; no IAVGSNSP/IAVGSNSN average current sense; fixed 5V DRVCC; 32-pin TSSOP package. | Suitable for ≤60V systems only; lacks input/output average current loop needed for battery charge control. | Select LTC3779EFE#TRPBF when 150V operation, average current monitoring, or programmable DRVCC is required. |
| MPQ4333AGL-AEC1-P | Automotive-grade 60V buck-boost controller; integrated MOSFETs; no PLL sync; 12V max DRVCC; QFN-24 package. | Integrated solution for space-constrained automotive modules; not suitable for discrete high-power designs or >60V inputs. | Choose LTC3779EFE#TRPBF for discrete high-voltage (>60V), high-current (>10A), or PLL-synchronized applications. |
Compared with LTC3780EFE#TRPBF and MPQ4333AGL-AEC1-P, the LTC3779EFE#TRPBF uniquely delivers 150V operation, triple current-sense architecture, and programmable DRVCC-making it the only option for high-voltage battery chargers, telecom rectifiers, and industrial UPS systems requiring full design flexibility.
Availability
LTC3779EFE#TRPBF is available at Aetrix Electronics and suitable for automotive 48V mild hybrid systems, telecom backup power supplies, and industrial battery energy storage requiring stable component supply and long-term lifecycle support.
Supply support for LTC3779EFE#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, 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 LTC3779EFE#TRPBF belongs to ADI's Power by Linear™ high-voltage controller product line, designed specifically for demanding applications requiring wide VIN/VOUT ranges, precise regulation, and robust fault protection in harsh environments.
FAQ
What is the maximum input voltage rating for the LTC3779EFE#TRPBF?
The LTC3779EFE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 150V, with operational range from 4.5V to 150V. This allows direct interface with high-voltage battery stacks, telecom rectifiers, and industrial power rails without external pre-regulation. The RUN, VINOV, and sense pins are all rated to 150V, ensuring robustness across the entire input range.
How does the LTC3779EFE#TRPBF handle buck-boost mode transitions?
The LTC3779EFE#TRPBF uses a proprietary control architecture that monitors VINSNS and VOUTSNS to detect buck-boost boundary conditions and seamlessly transitions between modes without output discontinuity or reverse current. Its dual current-sense paths (valley for buck, peak for boost) and dedicated buck-boost transition comparator ensure stable regulation during VIN ≈ VOUT operation.
Can the LTC3779EFE#TRPBF be synchronized to an external clock?
Yes, the LTC3779EFE#TRPBF supports external synchronization via the PLLIN pin, accepting clock signals from 50kHz to 600kHz. When enabled, the internal PLL locks the oscillator to the external clock without requiring external compensation components. This feature is fully compatible with both forced continuous and pulse-skipping modes selected via the MODE pin.
What is the purpose of the IAVGSNSP and IAVGSNSN pins on the LTC3779EFE#TRPBF?
The IAVGSNSP and IAVGSNSN pins implement an input/output average current sense loop with a 47.5–52.5mV threshold, enabling precise average current regulation for battery charging, current-limited power supplies, or redundant power system balancing. If unused, these pins must be shorted together and tied to V5 to disable the function safely.
Does the LTC3779EFE#TRPBF support programmable gate drive voltage?
Yes, the LTC3779EFE#TRPBF supports programmable DRVCC voltage from 6V to 10V in 1V increments using the DRVSET pin. Configurations include SGND = 6V, 1/4•V5 = 7V, floating = 8V, 3/4•V5 = 9V, and V5 = 10V. This allows optimization of gate drive strength for specific MOSFETs, balancing switching losses, conduction losses, and driver efficiency.
LTC3779EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3779EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779EFE#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 LTC3779EFE#TRPBF reliable?
The price and inventory of LTC3779EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3779EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779EFE#TRPBF?
LTC3779EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779EFE#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 LTC3779EFE#TRPBF?
For technical support, including LTC3779EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3779EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3779EFE#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 LTC3779EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3779EFE#TRPBF?
All LTC3779EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779EFE#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 LTC3779EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3779EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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