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Analog Devices Inc. LTC3779IFE#PBF
- Part No.:
- LTC3779IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
LTC3779IFE#PBF from Analog Devices is a 4-switch synchronous buck-boost DC/DC controller IC operating from 4.5V to 150V input and delivering 1.2V to 150V output with ±1% reference accuracy, phase-lockable 50–600kHz switching, and input/output average current limiting - used in high-voltage automotive battery management and telecom power systems.
For engineers reviewing the LTC3779IFE#PBF datasheet, LTC3779IFE#PBF pinout, LTC3779IFE#PBF application, or LTC3779IFE#PBF equivalent, key selection criteria include its 150V absolute max VIN/VOUT rating, programmable DRVCC (6–10V), 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 LTC3779IFE#PBF implements a constant-frequency current-mode control architecture with independent peak/valley current sensing in buck/boost regions and a dedicated input/output average current loop via IAVGSNSP/IAVGSNSN pins. Its proprietary 4-switch single-inductor topology enables seamless transitions between buck, buck-boost, and boost modes without discontinuity.
It integrates three LDOs: a 5.5V V5 regulator for control logic, a programmable 6–10V DRVCC regulator for gate drivers (set by DRVSET), and switchover-capable EXTVCC/VIN/NDRV LDO paths. The RUN pin supports 150V-rated enable with 1.2V turn-on threshold and hysteresis, while PLLIN enables synchronization to external clocks up to 600kHz.
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 direct regulation from 12V/24V/48V batteries to 48V/96V/120V bus rails. |
| Reference Voltage | 1.2V ±1% - ensures precise output voltage setting across temperature and load for stable system power rails. |
| Switching Frequency | 50kHz to 600kHz, phase-lockable - allows EMI optimization and noise-sensitive system coexistence. |
| Current Sensing | Dual-path: valley/peak (SENSEP/SENSEN) + average (IAVGSNSP/IAVGSNSN) - enables robust overcurrent protection and battery charge control. |
| DRVCC Programmability | 6V to 10V in 1V steps via DRVSET pin - optimizes MOSFET gate drive efficiency and switching loss trade-off. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE38 variant), thermally enhanced with exposed PGND pad (Pin 39) requiring PCB soldering for rated thermal performance (θJA = 28°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1, BG2 (1, 19) | Bottom gate driver outputs | Drive N-channel MOSFET sources to PGND; support synchronous rectification with low RDS(on) FETs. |
| TG1, TG2 (37, 21) | Top gate driver outputs | Floating high-side drivers referenced to SW1/SW2; swing up to VIN + DRVCC for full N-FET utilization. |
| SENSEP, SENSEN (11, 12) | Differential current sense inputs | Set peak/valley current limit in buck/boost modes; resolution supports <10mΩ sense resistors. |
| IAVGSNSP, IAVGSNSN (26, 28) | Average current sense inputs | Enable input/output current regulation - critical for battery charging and source/sink applications. |
| RUN (24) | Enable control input | 150V-rated enable with 1.2V threshold and 100mV hysteresis; internal 2.5µA pull-up avoids floating. |
| PLLIN (16) | External clock sync input | Accepts 50–600kHz square wave; internal PLL locks oscillator without external loop filter components. |
| PGND (39) | Driver power ground | Exposed thermal pad - must be soldered to PCB ground plane for electrical integrity and 28°C/W θJA. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost topology | Single-inductor architecture enables VIN > VOUT, VIN < VOUT, and VIN = VOUT operation without mode switching artifacts. |
| Programmable DRVCC (6–10V) | DRVSET pin selects gate drive voltage in 1V steps - balances MOSFET switching loss vs. conduction loss across wide VDS range. |
| Input/output average current limit | IAVGSNSP/IAVGSNSN pins provide bidirectional current regulation - essential for battery charge/discharge and regenerative systems. |
| No top-FET refresh noise | Eliminates gate-drive glitches during buck/boost transitions - reduces EMI in noise-sensitive RF and sensor subsystems. |
| VOUT disconnect at shutdown | Internal switches isolate output from input when RUN = 0 - prevents backfeed and meets safety requirements in redundant supplies. |
Applications
| Automotive Battery Management | Telecom 48V Backup Supply |
|---|---|
|
Use Scenario: Regulating 12V–150V vehicle battery to stable 48V rail for ADAS cameras and radar modules. IC Role / Device Role / Timing Role: 4-switch buck-boost controller managing bidirectional power flow and seamless transition across engine start-stop cycles. Use Value: Maintains regulated 48V output during cranking dips (VIN = 6V) and alternator surges (VIN = 150V) without dropout or reset. |
Use Scenario: Converting 48V telecom battery to 12V/24V auxiliary rails during AC mains failure. IC Role / Device Role / Timing Role: High-efficiency synchronous controller enabling >96% conversion at 10A load with programmable frequency for EMI compliance. Use Value: Dual current-sense capability supports both output overcurrent protection and input battery discharge current limiting. |
| Industrial HV DC Power Distribution | Medical Imaging Power Supply |
|
Use Scenario: Stepping down 120VDC factory bus to 24V/48V for PLC I/O and motor drives. IC Role / Device Role / Timing Role: High-voltage controller with 150V absolute max ratings and thermal pad for reliable operation in enclosed cabinets. Use Value: Phase-lockable oscillator synchronizes multiple converters to avoid beat frequencies in multi-rail systems. |
Use Scenario: Generating isolated ±15V and 5V rails from 48V battery in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision 1.2V reference and soft-start (SS pin) ensure controlled ramp-up of sensitive analog front-end supplies. Use Value: Pulse-skipping mode delivers >92% efficiency at light loads (<100mA), extending battery runtime. |
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#PBF | Lower 60V max VIN/VOUT rating; no average current sense; fixed 5V DRVCC. | Suitable only for ≤60V systems; lacks IAVGSNSP/IAVGSNSN for battery charge control. | Select LTC3779IFE#PBF when 150V rating, average current regulation, or programmable DRVCC are required. |
| MPQ4333GLED-AEC1-Z | Automotive-grade 60V buck-boost; integrated MOSFETs; no PLL sync; no average current loop. | Targeted at cost-sensitive automotive infotainment; not suitable for >60V or precision current regulation. | Choose LTC3779IFE#PBF for high-voltage industrial/telecom use cases demanding design flexibility and extended voltage range. |
Compared with LTC3780EFE#PBF and MPQ4333GLED-AEC1-Z, the LTC3779IFE#PBF uniquely combines 150V operation, dual current-sensing (peak/valley + average), and programmable DRVCC - making it the only option for high-reliability, wide-range battery-backed systems requiring precise input/output current control.
Availability
LTC3779IFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, telecom backup power, and industrial HV DC distribution requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3779IFE#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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3779IFE#PBF belongs to ADI's high-voltage power controller product line, designed specifically for wide-input, wide-output, bidirectional power conversion in harsh environments where reliability and precision are critical.
FAQ
What is the maximum input voltage rating for the LTC3779IFE#PBF?
The LTC3779IFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V, with corresponding 150V ratings on SW1, SW2, BOOST1, BOOST2, RUN, and sense pins (IAVGSNSP/IAVGSNSN, VINSNS, VOUTSNS). This enables direct connection to high-voltage battery stacks and telecom rectified buses without external clamping.
How does the LTC3779IFE#PBF support battery charging applications?
The LTC3779IFE#PBF supports battery charging via its input/output average current sense inputs (IAVGSNSP/IAVGSNSN), which enable precise regulation of charge current regardless of whether the converter operates in buck, boost, or buck-boost mode - a capability confirmed in the datasheet's "Input or Output Average Current Limit" feature and electrical characteristics table.
Can the LTC3779IFE#PBF operate in forced continuous conduction mode (CCM)?
Yes, the LTC3779IFE#PBF can operate in forced continuous conduction mode by tying the MODE pin to SGND or below 0.8V. This ensures constant switching frequency for EMI-sensitive applications, unlike pulse-skipping mode which improves light-load efficiency but introduces variable frequency operation.
What is the purpose of the DRVSET pin on the LTC3779IFE#PBF?
The DRVSET pin on the LTC3779IFE#PBF programs the DRVCC LDO output voltage in 1V increments from 6V to 10V - allowing optimization of gate drive strength versus MOSFET switching losses across diverse high-voltage FET selections, as specified in the Electrical Characteristics table under "DRVCC Regulation Voltage".
Does the LTC3779IFE#PBF include thermal protection?
The LTC3779IFE#PBF includes overtemperature protection that activates above its maximum rated junction temperature (150°C for H-grade, 125°C for I-grade), but this is intended only for momentary overload conditions. Continuous operation above the specified junction temperature may impair reliability - proper thermal design using the exposed PGND pad is required to maintain TJ ≤ 125°C.
LTC3779IFE#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
LTC3779IFE#PBF FAQ
1.How can I place an order for LTC3779IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779IFE#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 LTC3779IFE#PBF reliable?
The price and inventory of LTC3779IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3779IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779IFE#PBF?
LTC3779IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779IFE#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 LTC3779IFE#PBF?
For technical support, including LTC3779IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779IFE#PBF requirements.
6.How does Aetrix verify that LTC3779IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3779IFE#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 LTC3779IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3779IFE#PBF?
All LTC3779IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779IFE#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 LTC3779IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3779IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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