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Analog Devices Inc. LTC3779HFE#TRPBF
- Part No.:
- LTC3779HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,712
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Product details
Overview
LTC3779HFE#TRPBF from Analog Devices is a high-voltage 4-switch synchronous buck-boost controller supporting input and output voltages from 4.5V to 150V, operating in constant-frequency current mode up to 600kHz, with ±1% 1.2V reference, programmable DRVCC (6–10V), and integrated input/output average current limiting - used in automotive battery management and telecom power systems.
For engineers reviewing the LTC3779HFE#TRPBF datasheet, LTC3779HFE#TRPBF pinout, LTC3779HFE#TRPBF application, or LTC3779HFE#TRPBF equivalent, key selection considerations include VIN/VOUT overlap capability, phase-lockable frequency range (50–600kHz), thermal rating (–40°C to 150°C), gate driver strength (TG pull-up: 3.1Ω), and 38-lead FE38 TSSOP package with exposed PGND pad.
Technical Context
The LTC3779HFE#TRPBF implements a 4-switch single-inductor buck-boost topology with seamless transition between buck, boost, and buck-boost regions using dual current-sense paths: valley current sensing (SENSEP/SENSEN) for buck-mode control and peak current sensing for boost-mode control. Its transconductance error amplifier (gm = 1.5 mmho) drives the ITH node to regulate output voltage or input/output average current.
It integrates three independent LDOs: V5 (5.5V, ±1% regulation), DRVCC (6–10V programmable via DRVSET), and EXTVCC switchover (36V max), plus internal charge pump for NDRV-driven external NMOS pass device. The RUN pin features 150V rating with 1.2V turn-on threshold and 100mV hysteresis, enabling direct connection to high-voltage rails.
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 flexible output setting across buck, boost, and buck-boost modes. |
| Switching Frequency | 50kHz to 600kHz (PLL-sync capable) - allows EMI optimization and inductor size reduction. |
| Reference Voltage | ±1% at 1.2V - ensures precise output regulation over temperature and line/load conditions. |
| DRVCC Programmability | 6V to 10V in 1V steps via DRVSET pin - optimizes gate drive efficiency for different MOSFET RDS(on) and switching losses. |
| Operating Temp | –40°C to +150°C junction - qualified for under-hood automotive and high-reliability industrial environments. |
| Current Sense Thresholds | Buck valley: 70–110mV; Boost peak: 120–160mV; Avg current: 47.5–52.5mV - enables accurate current limiting in all operating modes. |
Pinout & Package
Package: 38-lead FE38 TSSOP with thermally enhanced exposed PGND pad (Pin 39), rated for 150°C junction operation and optimized for high-voltage isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (24) | Enable control input | 150V-rated enable with 1.2V turn-on threshold and 100mV hysteresis - allows direct connection to high-side supply rails. |
| DRVSET (3) | DRVCC voltage programming | Selects DRVCC output: GND=6V, 1/4•V5=7V, float=8V, 3/4•V5=9V, V5=10V - tailors gate drive for MOSFET optimization. |
| IAVGSNSP/IAVGSNSN (26/28) | Average current sense inputs | Differential pair for input/output average current regulation - supports battery charging and source/sink current limiting. |
| TG1/TG2 (37/21) | Top gate drivers | Floating high-side drivers with 3.1Ω pull-up (VDRVCC=9V) - directly drive N-channel MOSFET gates referenced to SW nodes. |
| BOOST1/BOOST2 (36/22) | Bootstrap supplies | Swing from ~DRVCC–0.7V to VIN+DRVCC - sustains top-FET gate drive during continuous conduction. |
| PGND (39) | Driver power ground | Exposed thermal pad tied to PCB ground - mandatory for rated electrical performance and 28°C/W θJA thermal resistance. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost architecture | Single-inductor topology enabling VIN above, below, or equal to VOUT - eliminates need for separate buck/boost converters. |
| Programmable DRVCC (6–10V) | Five-step adjustment via DRVSET pin - balances gate drive strength, switching loss, and MOSFET safe operating area. |
| Input/output average current limit | Dual-path current sensing (IAVGSNSP/IAVGSNSN) - supports bidirectional current regulation for battery charge/discharge applications. |
| No top-FET refresh noise | Control logic prevents gate drive glitches during mode transitions - reduces EMI in noise-sensitive telecom and avionics systems. |
| VOUT disconnected from VIN during shutdown | Internal FET isolation activated on RUN low - prevents backfeed and ensures true output disable in safety-critical systems. |
Applications
| Automotive Battery Management | Telecom 48V Intermediate Bus |
|---|---|
|
Use Scenario: Regulating 12V/24V/48V battery stacks in start-stop systems and EV auxiliary power units. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow between battery and load with seamless mode transitions. Use Value: Enables stable 48V output from variable 12–60V battery input while maintaining >96% efficiency at 10A load per datasheet TA01b. |
Use Scenario: Generating isolated 48V intermediate bus from 36–72V telecom rectifier outputs. IC Role / Device Role / Timing Role: High-voltage synchronous controller delivering regulated 48V at up to 10A with phase-lockable 250kHz operation. Use Value: Supports tight output regulation (±1%) and fast transient response (<125µs PGOOD delay) required for distributed power architectures. |
| Industrial HV DC Power Supply | Avionics Power Conversion |
|
Use Scenario: Converting 100–120VDC industrial mains to adjustable 24–48VDC for PLC and motor control systems. IC Role / Device Role / Timing Role: 150V-rated controller operating in forced continuous mode to suppress switching noise in EMI-sensitive factory environments. Use Value: Delivers 98% peak efficiency at 72V input/48V output per Figure G01, with thermal rating up to 150°C junction. |
Use Scenario: Power conditioning in airborne systems requiring MIL-STD-704 compliance and extended temperature operation. IC Role / Device Role / Timing Role: High-reliability buck-boost controller with 150V absolute max ratings and –40°C to +150°C guaranteed operation. Use Value: Meets avionics thermal and voltage stress requirements with robust RUN pin (150V), UVLO hysteresis, and current foldback protection. |
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#TRPBF | Lower max VIN/VOUT (40V), no IAVG current sense, 125°C temp grade only | Suitable for lower-voltage industrial DC-DC but lacks battery charging support | Choose LTC3779HFE#TRPBF when 150V operation, average current regulation, or 150°C ambient is required. |
| MPQ4332GJ-AEC1-Z | Automotive-grade 4-switch buck-boost, 36V max, integrated MOSFETs, no DRVCC programmability | Targeted at cost-sensitive automotive infotainment with fixed 5V/3.3V outputs | Choose LTC3779HFE#TRPBF for high-voltage flexibility, external MOSFET control, and programmable gate drive. |
Compared with LTC3789EFE#TRPBF and MPQ4332GJ-AEC1-Z, the LTC3779HFE#TRPBF uniquely combines 150V operation, bidirectional average current sensing, and 6–10V DRVCC programmability - making it the only option for high-reliability, wide-input battery backup and telecom power systems requiring full design control.
Availability
LTC3779HFE#TRPBF is available at Aetrix Electronics and suitable for automotive battery management, telecom 48V intermediate bus, and industrial HV DC power supply applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC3779HFE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and aerospace markets.
The LTC3779 belongs to ADI's high-voltage power management controller product line, designed specifically for wide-input-range, high-efficiency buck-boost conversion in harsh environments including automotive, telecom, and avionics.
FAQ
What is the maximum operating junction temperature for the LTC3779HFE#TRPBF?
The LTC3779HFE#TRPBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C, as confirmed by its H-grade qualification and thermal data (θJA = 28°C/W). This exceeds the 125°C rating of standard E/I-grade variants and supports under-hood automotive deployment where ambient temperatures exceed 105°C.
How does the DRVSET pin affect gate driver performance in the LTC3779HFE#TRPBF?
The DRVSET pin on the LTC3779HFE#TRPBF selects the DRVCC output voltage in 1V increments from 6V to 10V, directly impacting top/bottom gate driver strength. At 10V DRVCC, TG pull-up resistance drops to 3.1Ω (vs 6.4Ω at 6V), reducing MOSFET switching time and conduction loss - critical for optimizing efficiency with low-RDS(on) FETs in high-current designs.
Can the LTC3779HFE#TRPBF regulate both input and output average current simultaneously?
No - the LTC3779HFE#TRPBF supports either input average current limiting or output average current limiting, selected via external resistor configuration on IAVGSNSP/IAVGSNSN, but not both simultaneously. The datasheet specifies "Input or Output Average Current Limit" as a feature, and the block diagram shows a single IAVG comparator path feeding into the control loop.
What is the purpose of the RUN pin's 150V absolute maximum rating in the LTC3779HFE#TRPBF?
The 150V absolute maximum rating on the RUN pin of the LTC3779HFE#TRPBF enables direct connection to high-voltage input rails (e.g., 96V battery packs or 48V telecom buses) without external level-shifting circuitry. Its 1.2V turn-on threshold and 100mV hysteresis ensure reliable enable/disable control even under noisy or fluctuating supply conditions.
Does the LTC3779HFE#TRPBF support synchronization to an external clock source?
Yes - the LTC3779HFE#TRPBF supports external clock synchronization via the PLLIN pin, accepting input frequencies from 50kHz to 600kHz. When synchronized, the internal oscillator locks to the external clock while preserving the selected operating mode (forced continuous or pulse-skipping) determined by the MODE pin state.
LTC3779HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3779HFE#TRPBF FAQ
1.How can I place an order for LTC3779HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779HFE#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 LTC3779HFE#TRPBF reliable?
The price and inventory of LTC3779HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3779HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779HFE#TRPBF?
LTC3779HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779HFE#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 LTC3779HFE#TRPBF?
For technical support, including LTC3779HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3779HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3779HFE#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 LTC3779HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3779HFE#TRPBF?
All LTC3779HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779HFE#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 LTC3779HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3779HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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