My Inquiry
My Account
Analog Devices Inc. LTC3780EG#TRPBF
- Part No.:
- LTC3780EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3780EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,222
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3780EG#TRPBF from Analog Devices is a high-performance, synchronous 4-switch buck-boost controller enabling single-inductor DC/DC conversion where input voltage may be above, below, or equal to output voltage. It delivers ±1% output voltage accuracy over 0.8V–30V range, supports up to 400kHz phase-lockable switching frequency, and achieves up to 98% efficiency in automotive and telecom power systems.
For engineers reviewing the LTC3780EG#TRPBF datasheet, LTC3780EG#TRPBF pinout, LTC3780EG#TRPBF application, or LTC3780EG#TRPBF equivalent, key selection considerations include seamless buck/boost/buck-boost mode transitions, FCB-selectable low-current modes (Burst Mode® in boost, skip-cycle in buck), internal 6V LDO for gate drive, and quad N-channel MOSFET synchronous drive capability with validated 24-pin SSOP package.
Technical Context
The LTC3780EG#TRPBF implements constant-frequency current-mode control with dual-loop architecture: an outer voltage loop (error amplifier comparing VOSENSE to 0.8V reference) and inner current loop (ITH-controlled peak/valley current sensing via SENSE+/SENSE–). Its proprietary 4-switch topology enables continuous conduction across VIN/VOUT crossover without discontinuity or regulation loss.
Operating mode is determined by VIN/VOUT ratio and FCB pin voltage: forced continuous mode (<0.8V), skip-cycle (buck) or Burst Mode® (boost) at 0.85–5V, and discontinuous mode with constant frequency (>5.3V). Internal timing includes 200ns minimum on-time in boost and 180ns in buck, with 250ns mode-transition delays ensuring smooth transfer between buck, buck-boost, and boost regions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V max - supports wide automotive battery transients and telecom -48V systems with robust UVLO at 4V. |
| Output Voltage Accuracy | ±1% over 0.8V–30V - ensures stable regulation for precision analog rails and FPGA core supplies. |
| Switching Frequency | 200kHz–400kHz, phase-lockable - enables EMI reduction via synchronization and optimal inductor sizing. |
| Efficiency | Up to 98% - achieved via synchronous rectification and low-loss gate drivers (TG/BG rise/fall times ≤55ns). |
| Current Sense Threshold | Buck min: –6mV; Boost max: +185mV - supports accurate current limiting and foldback protection across load conditions. |
| Power Good Threshold | ±7.5% of setpoint - provides reliable system-level power sequencing and fault detection. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood applications. |
Pinout & Package
Package: 24-Lead Plastic SSOP (G package), 5.0mm × 7.5mm, exposed pad not present. Thermal resistance θJA = 130°C/W. Compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain status output | Asserts low when VOUT deviates >±7.5% - enables safe power sequencing and system reset coordination. |
| SS (Pin 2) | Soft-start control | Accepts external capacitor to ramp ITH voltage gradually - prevents inrush current into input capacitors during startup. |
| SENSE+ / SENSE– (Pins 3–4) | Differential current sense inputs | Measure voltage across external RSENSE to regulate peak/valley inductor current - critical for stability and overcurrent protection. |
| ITH (Pin 5) | Error amplifier output & current threshold | 0–2.4V control voltage sets current limit; also used for compensation - directly links voltage error to current command. |
| VOSENSE (Pin 6) | Voltage feedback input | Connects to resistor divider from VOUT - compares against 0.8V internal reference to maintain regulation accuracy. |
| RUN (Pin 8) | Enable/disable control | Pull <1.5V to shut down all switching and gate drivers - supports low-quiescent standby with 55µA shutdown current. |
| FCB (Pin 9) | Mode selection input | Voltage-selectable operation: <0.8V = forced CCM; 0.85–5V = skip-cycle (buck) or Burst Mode® (boost); >5.3V = DCM. |
| BOOST1 / BOOST2 (Pins 13, 24) | Floating gate drive supplies | Provide bootstrapped voltage for TG1/TG2 high-side drivers - enable full N-MOSFET implementation without P-ch devices. |
| TG1 / TG2 (Pins 14, 23) | Top gate drivers | Drive high-side N-MOSFET gates with INTVCC-referenced swing - support fast switching with 50ns rise time (CLOAD = 3300pF). |
| BG1 / BG2 (Pins 16, 18) | Bottom gate drivers | Drive low-side N-MOSFET gates from PGND to INTVCC - ensure synchronous rectification and minimize conduction loss. |
| VIN (Pin 21) | Main input supply | Accepts 4–36V input; powers internal circuits and charges bootstrap caps - requires RC filter (1Ω + 0.1µF) for noise immunity. |
| INTVCC (Pin 19) | Internal 6V LDO output | Supplies gate drivers and control logic; regulated to 5.7–6.3V - bypass with ≥4.7µF ceramic for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters - reduces BOM count, PCB area, and design complexity in multi-rail systems. |
| Quad N-channel MOSFET synchronous drive | Enables highest efficiency with discrete FET selection - avoids P-MOS limitations and supports optimized RDS(on) trade-offs per switch position. |
| VOUT disconnected from VIN during shutdown | Prevents backfeed through power path - essential for safety-critical systems and hot-swap applications. |
| Adjustable soft-start current ramping | External capacitor on SS pin controls startup dI/dt - prevents input voltage sag and protects upstream converters or batteries. |
| Output overvoltage protection | Hardware comparator triggers immediate shutdown if VOSENSE exceeds 0.86V - safeguards downstream loads independent of control loop. |
| Internal foldback current limiting | Reduces peak current at overload - maintains thermal stability and enables graceful degradation instead of hard latch-off. |
Applications
| Automotive Infotainment Power Supply | Telecom DC Power Distribution |
|---|---|
Use Scenario: Regulating 12V battery input to stable 5V/3.3V rails for head unit processors, displays, and audio codecs under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck-boost controller managing seamless mode transitions as battery voltage crosses 5V/3.3V output thresholds. Use Value: Maintains uninterrupted operation during engine start-stop cycles and eliminates need for pre-regulator stages. |
Use Scenario: Converting -48V telecom supply to +12V intermediate bus for PoE injectors, line cards, and optical modules. IC Role / Device Role / Timing Role: High-efficiency 4-switch controller delivering up to 98% efficiency at full load while supporting phase synchronization to system clock. Use Value: Reduces heat sink requirements and improves power density in space-constrained NEBS-compliant chassis. |
| Industrial Battery-Operated Test Equipment | High-Power USB-C PD Adapters |
Use Scenario: Powering portable oscilloscopes and multimeters from 2S–4S Li-ion packs (6–16.8V) to fixed 3.3V/15V rails with minimal dropout loss. IC Role / Device Role / Timing Role: Adaptive buck-boost regulator dynamically selecting optimal mode based on cell voltage and load demand. Use Value: Extends runtime by >12% vs fixed-buck solutions and enables full battery utilization down to 3.0V/cell. |
Use Scenario: Implementing programmable 5–20V output in compact 65W USB-C PD adapters using single inductor and discrete GaN FETs. IC Role / Device Role / Timing Role: Controller enabling high-frequency (400kHz) operation with precise VBUS regulation and fast transient response. Use Value: Achieves >94% average efficiency across 5–20V range while meeting strict EMI limits via PLL synchronization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8705EFE#PBF | Wider VIN range (2.8V–80V), integrated gate drivers, but no FCB-selectable low-power modes. | Better suited for high-voltage industrial solar or battery storage; lacks Burst Mode® for ultra-low-IQ battery apps. | Select LT8705 when input exceeds 36V or when integrated drivers reduce layout complexity. |
| MPQ4323GR-AEC1 | Automotive-grade 3.5–36V buck-boost with 2.5A integrated FETs; fixed 2.2MHz frequency, no phase-lock capability. | Targeted at cost-sensitive infotainment displays; limited to 2.5A output and no external FET flexibility. | Choose MPQ4323 for volume automotive designs needing AEC-Q100 qualification and simplified BOM. |
Compared with LT8705EFE#PBF and MPQ4323GR-AEC1, the LTC3780EG#TRPBF uniquely balances wide input range, external FET control, selectable light-load efficiency modes, and phase-lockable frequency - making it optimal for high-flexibility, high-efficiency industrial and telecom power designs requiring thermal and EMI optimization.
Availability
LTC3780EG#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom DC distribution, and industrial battery-operated equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3780EG#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3780EG#TRPBF belongs to Analog Devices' Power by Linear™ high-efficiency DC/DC controller family, designed specifically for demanding multi-input/multi-output power systems requiring seamless buck-boost operation and superior light-load efficiency.
FAQ
What is the maximum supported switching frequency for the LTC3780EG#TRPBF?
The LTC3780EG#TRPBF supports a phase-lockable fixed-frequency range from 200kHz to 400kHz. At VPLLFLTR = 2.4V, the typical maximum frequency is 400kHz, with absolute maximum specified at 440kHz. This allows designers to optimize efficiency versus size and EMI performance while enabling synchronization to system clocks for noise reduction in sensitive applications.
Does the LTC3780EG#TRPBF support true zero-current switching or only PWM control?
The LTC3780EG#TRPBF operates exclusively in current-mode PWM control and does not implement zero-current switching (ZCS) or resonant topologies. Its architecture relies on precise peak/valley current sensing via SENSE+/SENSE– and fixed-frequency or Burst Mode® operation - delivering predictable timing, stable loop response, and compatibility with standard magnetics, unlike quasi-resonant or LLC controllers.
Can the LTC3780EG#TRPBF be used with GaN or SiC FETs?
Yes, the LTC3780EG#TRPBF is fully compatible with GaN and SiC FETs. Its gate drivers deliver fast rise/fall times (≤55ns), low propagation delay (≤80ns), and robust 3A peak drive capability - meeting the stringent gate drive requirements of enhancement-mode GaN HEMTs and SiC MOSFETs. Layout best practices for high-speed switching must be followed to realize full benefits.
How does the FCB pin affect operation in buck versus boost mode?
The FCB pin selects operating mode independently for buck and boost regions: voltages <0.8V force continuous conduction mode in both; 0.85–5V enable skip-cycle mode in buck and Burst Mode® in boost; >5.3V activate discontinuous mode with constant frequency in both. This dual-context behavior is intrinsic to the LTC3780EG#TRPBF's control architecture and documented in the Rev G datasheet Figure 6.
Is the LTC3780EG#TRPBF pin-compatible with other members of the LTC3780 family?
Yes, the LTC3780EG#TRPBF shares identical pinout and functionality with all 24-lead SSOP variants (e.g., LTC3780IG#TRPBF, LTC3780MPG#TRPBF), differing only in temperature grade and part marking. Electrical characteristics, timing, and interface behavior are fully consistent across the SSOP package family - enabling drop-in replacement for thermal grade upgrades without layout changes.
LTC3780EG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- 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):
- 4V ~ 30V
- Frequency - Switching:
- 200kHz ~ 400kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3780EG#TRPBF FAQ
1.How can I place an order for LTC3780EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780EG#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 LTC3780EG#TRPBF reliable?
The price and inventory of LTC3780EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3780EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780EG#TRPBF?
LTC3780EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780EG#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 LTC3780EG#TRPBF?
For technical support, including LTC3780EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780EG#TRPBF requirements.
6.How does Aetrix verify that LTC3780EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3780EG#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 LTC3780EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3780EG#TRPBF?
All LTC3780EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780EG#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 LTC3780EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3780EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3780EG#TRPBF 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…
