My Inquiry
My Account
Analog Devices Inc. LTC3779HFE#PBF
- Part No.:
- LTC3779HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LTC3779HFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 38-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3779HFE#PBF from Analog Devices is a high-performance 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 automotive battery systems requiring seamless VIN-to-VOUT transitions.
For engineers reviewing the LTC3779HFE#PBF datasheet, LTC3779HFE#PBF pinout, LTC3779HFE#PBF application, or LTC3779HFE#PBF equivalent, key selection criteria include its 150V absolute maximum input rating, programmable DRVCC (6V–10V), thermal grade (–40°C to 150°C junction), and dual current-sense architecture supporting both valley (buck) and peak (boost) modes.
Technical Context
The LTC3779HFE#PBF uses a proprietary 4-switch single-inductor buck-boost topology with independent valley-current sensing in buck mode and peak-current sensing in boost mode, enabling stable regulation across all VIN/VOUT relationships. Its dual-loop architecture integrates an input/output average current sense amplifier (IAVGSNSP/IAVGSNSN) alongside the main ITH-controlled current loop.
Control logic includes a buck-boost transition detector that monitors VINSNS and VOUTSNS to dynamically select operating region, while the MODE pin selects between forced continuous conduction mode (CCM) or pulse-skipping mode (DCM) - the latter improving light-load efficiency without compromising startup behavior or reverse-current blocking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 150V - supports wide-input industrial and automotive battery systems including 48V, 72V, and 100V nominal rails. |
| VOUT Range | 1.2V to 150V - enables direct regulation of telecom 48V, PoE++, or high-voltage LED strings without intermediate stages. |
| Reference Voltage | 1.2V ±1% - provides tight output voltage accuracy over temperature and line/load, critical for precision power rails. |
| Switching Frequency | 50kHz to 600kHz (phase-lockable) - allows EMI optimization via external sync or fixed-frequency design with minimal filter size. |
| DRVCC Range | 6V to 10V (programmable via DRVSET) - optimizes gate drive strength and MOSFET RDS(on) utilization across input voltage range. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Current Sense Thresholds | Buck valley: 70–110mV; Boost peak: 120–160mV; Avg I/O: 47.5–52.5mV - enables accurate current limiting in all operating regions. |
Pinout & Package
Package: 38-lead thermally enhanced FE38 TSSOP with exposed PGND pad (Pin 39), rated for high-voltage operation and 28°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG1 / BG2 (1, 19) | Bottom gate drivers | Drive N-channel MOSFET sources to PGND; support synchronous rectification with low RDS(on) FETs. |
| TG1 / TG2 (37, 21) | Top gate drivers | Floating high-side drivers referenced to SW nodes; swing up to VIN + DRVCC for full enhancement. |
| BOOST1 / BOOST2 (36, 22) | Bootstrap supplies | Provide floating bias for top gate drivers; require external bootstrap capacitors tied between BOOSTx and SWx. |
| SENSEP / SENSEN (11, 12) | Main current sense inputs | Differential pair measuring inductor current; set trip thresholds via ITH voltage and RSENSE. |
| IAVGSNSP / IAVGSNSN (26, 28) | Average current sense inputs | Enable input or output average current regulation - e.g., battery charge current limiting or source current capping. |
| RUN (24) | Enable control | 150V-rated enable pin with 1.2V turn-on threshold and 100mV hysteresis; supports direct connection to high-voltage rails. |
| VINOV (2) | Input overvoltage monitor | Disables switching and disconnects VOUT from VIN when input exceeds programmed threshold (e.g., 1.28V = ~150V via divider). |
| PGOOD (18) | Output fault indicator | Open-drain signal asserting low when VFB deviates >±10% from 1.2V reference - used for system sequencing and safety interlocks. |
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 PCB area in bidirectional or wide-VIN applications. |
| Programmable DRVCC (6V–10V) | Optimizes gate drive voltage per MOSFET selection: lower DRVCC reduces switching loss in low-RDS(on) FETs; higher DRVCC improves conduction loss in high-voltage FETs. |
| No reverse current at startup | Prevents backfeeding during cold start - essential for battery-powered systems where load capacitance must be charged without drawing from source. |
| VOUT disconnected from VIN during shutdown | Ensures true output isolation when disabled - meets functional safety requirements for rail separation in automotive and medical equipment. |
| Thermally enhanced FE38 package | Exposed PGND pad soldered to PCB plane delivers 28°C/W θJA, enabling 10A+ output capability without heatsinks in compact layouts. |
Applications
| Automotive Battery Management | Telecom 48V Power Distribution |
|---|---|
Use Scenario: Regulating 12V/24V/48V battery stacks to supply infotainment, ADAS, or gateway ECUs across cold-crank (4.5V) and load-dump (150V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing bidirectional energy flow and maintaining stable 5V/3.3V rails despite wide input variation. Use Value: Seamless transition between buck, boost, and pass-through modes ensures uninterrupted operation during engine start-stop cycles and alternator voltage spikes. | Use Scenario: Converting -48V telecom rectifier output to +48V or +12V for optical modules, baseband units, or PoE++ injectors. IC Role / Device Role / Timing Role: High-efficiency (>96%) synchronous controller driving discrete SiC or GaN FETs in isolated or non-isolated 48V distribution networks. Use Value: 150V input rating and programmable current limits allow direct interface with legacy -48V infrastructure without pre-regulation stages. |
| Industrial HV DC Power Supplies | Medical Equipment Power Conversion |
Use Scenario: Generating adjustable 24V–100V outputs from unregulated 72V or 100V DC bus in factory automation or test equipment. IC Role / Device Role / Timing Role: Precision voltage regulator with ±1% reference and soft-start ramp control for sensitive analog subsystems and motor drives. Use Value: Programmable soft-start (via SS pin) prevents inrush current into large capacitor banks, reducing stress on upstream fuses and connectors. | Use Scenario: Powering imaging sensors, X-ray detectors, or patient monitoring circuits requiring ultra-stable, low-noise 3.3V/5V rails from high-voltage battery packs. IC Role / Device Role / Timing Role: Current-mode controller with forced CCM mode (via MODE pin) ensuring constant-frequency operation for EMI-sensitive diagnostic electronics. Use Value: Phase-lockable oscillator synchronizes switching to system clock domain - eliminating beat frequencies and simplifying conducted EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789HFE#PBF | Lower max VIN (60V), no IAVGSNS inputs, fixed 7.5V DRVCC, same 38-pin TSSOP package. | Suitable only for ≤60V systems; lacks input/output average current regulation required for battery charging or source current limiting. | Select LTC3779HFE#PBF when 150V operation, programmable DRVCC, or dual current-sense capability is mandatory. |
| MPQ4333HG-AEC1-P | Integrated 100V FETs, 3.5A max output, fixed 500kHz frequency, AEC-Q100 Grade 1, QFN-20 package. | Monolithic solution for lower-power automotive applications; lacks programmability, wide VOUT range, and external FET flexibility. | Select LTC3779HFE#PBF for >10A designs, >100V input, or custom FET selection (SiC/GaN) in harsh thermal environments. |
Compared with LTC3789HFE#PBF and MPQ4333HG-AEC1-P, the LTC3779HFE#PBF uniquely combines 150V operation, dual current-sense architecture, and programmable DRVCC - making it the only option for high-power, high-voltage, and functionally safe buck-boost systems requiring precise current regulation and thermal robustness.
Availability
LTC3779HFE#PBF is available at Aetrix Electronics and suitable for automotive battery management, telecom 48V distribution, and industrial HV DC power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3779HFE#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 LTC3779HFE#PBF belongs to ADI's Power by Linear™ high-voltage controller family, designed specifically for rugged, wide-input-range DC/DC conversion in mission-critical automotive, avionics, and industrial systems.
FAQ
What is the maximum input voltage rating for the LTC3779HFE#PBF?
The LTC3779HFE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V, with operational range from 4.5V to 150V. This rating applies to both the VIN pin and associated high-voltage pins including RUN, VINOV, IAVGSNSP, IAVGSNSN, VINSNS, and VOUTSNS - enabling direct interface with 48V, 72V, and 100V battery systems and telecom rectifiers.
How does the LTC3779HFE#PBF handle buck-boost mode transitions?
The LTC3779HFE#PBF uses dedicated VINSNS and VOUTSNS pins to monitor input and output side switch node voltages. Its internal buck-boost transition detector automatically selects buck, boost, or pass-through operation based on real-time VIN/VOUT relationship - ensuring seamless, glitch-free transitions without output droop or overshoot during dynamic load or input changes.
Can the LTC3779HFE#PBF regulate both input and output average current?
Yes. The LTC3779HFE#PBF includes dedicated IAVGSNSP and IAVGSNSN pins that implement an input/output average current sense amplifier. When configured, this loop regulates either input current (e.g., battery charge current) or output current (e.g., LED string current) independently of the main VFB voltage loop - providing dual-loop control for safety-critical or battery-limited applications.
What is the purpose of the DRVSET pin on the LTC3779HFE#PBF?
The DRVSET pin on the LTC3779HFE#PBF sets the regulated output voltage of the internal DRVCC LDO in 1V increments from 6V to 10V. Connection options include SGND (6V), 1/4•V5 (7V), floating (8V), 3/4•V5 (9V), or V5 (10V). This programmability allows optimization of gate drive strength versus MOSFET RDS(on) and switching losses across wide input voltage ranges.
Does the LTC3779HFE#PBF support synchronization to an external clock?
Yes. The LTC3779HFE#PBF features a PLLIN pin that accepts an external clock signal (50kHz–600kHz) to synchronize its internal oscillator. The integrated phase detector and compensation network eliminate need for external loop filters. Synchronization maintains forced CCM or pulse-skipping operation depending on MODE pin setting - critical for noise-sensitive systems requiring deterministic EMI profiles.
LTC3779HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3779HFE#PBF FAQ
1.How can I place an order for LTC3779HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3779HFE#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 LTC3779HFE#PBF reliable?
The price and inventory of LTC3779HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3779HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3779HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3779HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3779HFE#PBF?
LTC3779HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3779HFE#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 LTC3779HFE#PBF?
For technical support, including LTC3779HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3779HFE#PBF requirements.
6.How does Aetrix verify that LTC3779HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3779HFE#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 LTC3779HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3779HFE#PBF?
All LTC3779HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3779HFE#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 LTC3779HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3779HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3779HFE#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
