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Analog Devices Inc. LTC3779IFE#TRPBF
- Part No.:
- LTC3779IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,747
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Product details
Overview
LTC3779IFE#TRPBF from Analog Devices is a 150V-rated 4-switch synchronous buck-boost controller operating in constant-frequency current mode. It supports input and output voltages from 4.5V to 150V, enables seamless buck/boost/buck-boost transitions, delivers ±1% 1.2V reference accuracy, and features programmable 6V–10V DRVCC for gate driver optimization-used in high-reliability automotive power supplies and telecom rectifiers.
For engineers reviewing the LTC3779IFE#TRPBF datasheet, LTC3779IFE#TRPBF pinout, LTC3779IFE#TRPBF application, or LTC3779IFE#TRPBF equivalent, key selection criteria include VIN/VOUT overlap capability, input/output average current limiting, phase-lockable 50–600kHz operation, precision RUN pin threshold (1.2V), and thermally enhanced FE38 TSSOP packaging for high-voltage industrial converters.
Technical Context
The LTC3779IFE#TRPBF implements a proprietary 4-switch single-inductor buck-boost topology with valley-current sensing in buck region and peak-current sensing in boost region. Its dual-loop architecture supports independent input or output average current regulation via IAVGSNSP/IAVGSNSN pins, while the MODE pin selects between forced continuous conduction mode (CCM) or pulse-skipping mode (DCM) for light-load efficiency.
Internal power management includes three configurable LDO paths: VIN-based, NDRV-driven external NMOS, and EXTVCC-bypassed-each supporting DRVCC regulation at 6V–10V. The integrated PLL synchronizes switching frequency to external clocks up to 600kHz, and the RUN pin provides 150V-rated enable control with 100mV hysteresis and 2.5µA pull-up current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 150V - supports wide-input battery systems and industrial HVDC rails without pre-regulation |
| VOUT Range | 1.2V to 150V - enables direct generation of 48V telecom, 12V automotive, or 100V PoE++ outputs |
| Reference Voltage | ±1% @ 1.2V - ensures stable output regulation across temperature and load for precision power rails |
| 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 to optimize MOSFET RDS(on) vs gate drive loss |
| Current Sense Threshold | Buck: 70–110mV; Boost: 120–160mV - sets accurate overcurrent protection with minimal sense resistor loss |
| PGOOD Accuracy | ±10% of VFB setpoint - provides reliable output voltage fault detection for system sequencing |
Pinout & Package
Package: 38-lead plastic TSSOP (FE38), thermally enhanced with exposed PGND pad (Pin 39) soldered to PCB ground for rated thermal performance (θJA = 28°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1 / BG2 (1, 19) | Bottom gate drivers | Drive low-side N-MOSFET gates referenced to PGND; support up to 150V drain-source swing |
| TG1 / TG2 (37, 21) | Top gate drivers | Floating high-side drivers with DRVCC-referenced swing; require bootstrap capacitors on BOOST1/BOOST2 |
| SENSEP / SENSEN (11, 12) | Differential current sense inputs | Measure inductor current via sense resistor; define buck (valley) or boost (peak) current limit thresholds |
| IAVGSNSP / IAVGSNSN (26, 28) | Average current sense inputs | Enable input or output average current regulation loop for battery charging or current-limited sources |
| RUN (24) | Enable control input | 150V-rated logic input with 1.2V turn-on threshold and 100mV hysteresis; internal 2.5µA pull-up |
| DRVSET (3) | DRVCC voltage selector | Configures DRVCC output to 6V (GND), 7V (¼V5), 8V (float), 9V (¾V5), or 10V (V5) for gate drive optimization |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Automatic mode switching between buck, boost, and buck-boost regions without output disturbance or control loop reset |
| Input/output average current limit | Programmable current regulation loop using IAVGSNSP/IAVGSNSN pins for battery charge control or source current limiting |
| No top-FET refresh noise | Eliminates gate drive glitches during mode transitions-critical for low-noise instrumentation and RF power supplies |
| VOUT disconnection during shutdown | Isolates output from input when disabled-prevents backfeed in redundant power systems and safety-critical applications |
| 150V-rated RUN pin | Enables direct connection to high-voltage rails (e.g., 48V, 96V battery stacks) without level-shifting circuitry |
Applications
| Automotive 48V DC/DC Converter | Telecom Rectifier Module |
|---|---|
Use Scenario: Step-down from 60V battery stack to 12V auxiliary rail and step-up to 48V payload bus in mild-hybrid vehicles. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow with seamless transitions across varying battery SOC. Use Value: Eliminates need for separate buck and boost stages; ±1% reference and 150V rating ensure compliance with ISO 16750-2 load dump requirements. | Use Scenario: High-efficiency AC/DC front-end rectifier delivering 48V/10A to telecom base station equipment from 100–120V HVDC distribution. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating output under wide input transients and maintaining tight load regulation. Use Value: 99% synchronous efficiency reduces thermal stress; programmable DRVCC optimizes gate drive for SiC MOSFETs used in high-frequency rectifiers. |
| Industrial Battery Charger | Avionics Power Supply |
Use Scenario: Constant-current/constant-voltage charger for Li-ion battery packs ranging from 24V to 100V nominal voltage. IC Role / Device Role / Timing Role: Controller implementing input average current limit for AC adapter input and output voltage/current regulation for battery termination. Use Value: Dual-loop regulation (IAVGSNSP/IAVGSNSN + VFB) enables precise CC/CV profiles; soft-start prevents inrush into large battery capacitance. | Use Scenario: 28V aircraft bus converter supplying 5V/12V/28V rails to flight control electronics with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: Isolated or non-isolated primary controller synchronized to avionics clock via PLLIN for deterministic switching timing. Use Value: Phase-lockable 50–600kHz operation avoids critical EMI bands; PGOOD output enables safe power sequencing per DO-160G Section 22. |
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 |
|---|---|---|---|
| LTC3780EFE#TRPBF | Lower 60V max VIN/VOUT rating; no IAVGSNSP/IAVGSNSN average current loop; fixed 7.5V DRVCC | Suitable only for ≤60V systems; lacks input/output current regulation required for battery charging | Select LTC3779IFE#TRPBF when >60V operation or programmable average current limiting is required |
| MPQ4333GLED-A | Integrated 100V MOSFETs; fixed 300kHz frequency; no PLL sync or DRVCC programming; 1.5% reference tolerance | Compact solution for space-constrained designs but limited to 100V and no external gate driver flexibility | Select LTC3779IFE#TRPBF when discrete MOSFET selection, 150V rating, or frequency synchronization is needed |
Compared with LTC3780EFE#TRPBF and MPQ4333GLED-A, the LTC3779IFE#TRPBF uniquely combines 150V operation, dual current-sense architecture (peak/valley + average), and fully programmable gate drive voltage-making it the only choice for high-voltage, multi-loop regulated industrial and aerospace converters.
Availability
LTC3779IFE#TRPBF is available at Aetrix Electronics and suitable for automotive power conversion, telecom rectification, and industrial battery charging requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC3779IFE#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 for precision, power, and connectivity applications.
The LTC3779 belongs to ADI's Power by Linear™ controller family, designed specifically for high-voltage, high-efficiency, and high-reliability DC/DC conversion in automotive, industrial, and communications infrastructure.
FAQ
What is the maximum input voltage rating for the LTC3779IFE#TRPBF?
The LTC3779IFE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 150V, with guaranteed operation from 4.5V to 150V. This allows direct interface with 48V, 60V, and 96V battery systems and telecom HVDC distribution without external voltage clamping or pre-regulation stages.
How does the MODE pin affect operation of the LTC3779IFE#TRPBF?
The MODE pin on the LTC3779IFE#TRPBF selects between forced continuous conduction mode (CCM) when tied to SGND or below 0.8V, and pulse-skipping mode (DCM) when tied to V5. CCM ensures constant switching frequency for noise-sensitive applications, while DCM improves light-load efficiency by skipping cycles.
Can the LTC3779IFE#TRPBF regulate both input and output current simultaneously?
No-the LTC3779IFE#TRPBF supports either input average current regulation (via IAVGSNSP/IAVGSNSN) or output average current regulation, but not both simultaneously. The same differential amplifier is shared, and configuration depends on external resistor network placement relative to the input or output side of the power stage.
What is the purpose of the RUN pin on the LTC3779IFE#TRPBF?
The RUN pin on the LTC3779IFE#TRPBF is a 150V-rated enable input with a precise 1.2V turn-on threshold and 100mV hysteresis. It features internal 2.5µA pull-up current and supports direct connection to high-voltage rails-enabling simple, robust enable control in battery-powered and industrial systems without external level shifters.
Does the LTC3779IFE#TRPBF support external clock synchronization?
Yes-the LTC3779IFE#TRPBF supports full phase-lockable operation via the PLLIN pin. When an external clock (50–600kHz) is applied, the internal PLL synchronizes the oscillator while preserving all functional modes-including forced CCM or pulse-skipping-controlled independently by the MODE pin.
LTC3779IFE#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
LTC3779IFE#TRPBF FAQ
1.How can I place an order for LTC3779IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779IFE#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 LTC3779IFE#TRPBF reliable?
The price and inventory of LTC3779IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3779IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779IFE#TRPBF?
LTC3779IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779IFE#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 LTC3779IFE#TRPBF?
For technical support, including LTC3779IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3779IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3779IFE#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 LTC3779IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3779IFE#TRPBF?
All LTC3779IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779IFE#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 LTC3779IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3779IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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