My Inquiry
My Account
Analog Devices Inc. LTC3780EUH#PBF
- Part No.:
- LTC3780EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3780EUH#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,789
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3780EUH#PBF from Analog Devices is a high-efficiency, 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, and achieves up to 98% efficiency in automotive and telecom power systems.
For engineers reviewing the LTC3780EUH#PBF datasheet, LTC3780EUH#PBF pinout, LTC3780EUH#PBF application, or LTC3780EUH#PBF equivalent, key selection considerations include its seamless buck/boost/buck-boost mode transitions, FCB-selectable low-current modes (Burst Mode® in boost, skip-cycle in buck), quad N-channel MOSFET drive capability, and integrated 6V LDO for gate drivers.
Technical Context
The LTC3780EUH#PBF implements constant-frequency current-mode control with independent sensing paths for buck and boost operation, using SENSE+ and SENSE– pins to monitor inductor current via an external sense resistor. Its architecture dynamically selects among three operating regions-buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT)-with sub-200ns mode transition times and no discontinuity in regulation.
Control logic is governed by the FCB pin, which configures forced continuous, discontinuous, or pulse-skipping modes separately for buck and boost phases. The internal 6V LDO powers gate drivers and control circuitry, while EXTVCC switchover (5.4V–5.7V threshold) enables external biasing to reduce power loss at high input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V max - supports wide automotive battery transients and telecom -48V derived rails. |
| Output Voltage Accuracy | ±1% over 0.8V–30V - ensures stable regulation across industrial and communications loads. |
| Switching Frequency | 200kHz–400kHz, phase-lockable - enables EMI reduction via synchronization to system clock. |
| Peak Efficiency | Up to 98% - achieved via synchronous rectification and optimized gate drive timing (TG/BG tr/tf < 55ns). |
| Current Sense Threshold | Buck min: –6mV; Boost max: +185mV - supports precise current limiting and foldback protection. |
| Power Good Window | ±7.5% of setpoint - provides reliable system-level power sequencing and fault detection. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = SGND), rated θJA = 34°C/W. Requires soldering of exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 30) | Open-drain status output | Asserts low when VOSENSE deviates >±7.5% from 0.8V reference - used for system power-good signaling. |
| SS (Pin 31) | Soft-start control | Accepts external capacitor to ramp ITH voltage linearly, limiting inrush current during startup. |
| SENSE+ / SENSE– (Pins 1/2) | Differential current sense inputs | Measure voltage across external RSENSE to regulate peak/valley inductor current in buck or boost mode. |
| ITH (Pin 3) | Error amplifier output / current limit control | 0–2.4V analog signal sets current trip threshold; clamped by SS during soft-start. |
| VOSENSE (Pin 4) | Feedback input | Connects to resistor divider from VOUT; referenced to 0.8V internal bandgap for ±1% regulation. |
| RUN (Pin 6) | Enable/disable control | Pull below 1.5V to shut down all switching; internal 100kΩ pull-down enables simple ON/OFF control. |
| FCB (Pin 7) | Mode selection input | Voltage-selectable: <0.8V = forced CCM; 0.85–5V = skip-cycle (buck) or Burst Mode® (boost); >5.3V = DCM. |
| PLLIN (Pin 10) | External clock sync input | 50kΩ internal termination; synchronizes rising edge of bottom gate drive to external clock source. |
| TG1/TG2 (Pins 15/26) | Top gate drivers | Drive high-side N-MOSFET gates with INTVCC-referenced swing; support bootstrap operation up to VIN+INTVCC. |
| BG1/BG2 (Pins 18/20) | Bottom gate drivers | Drive low-side N-MOSFET gates from PGND to INTVCC; enable synchronous rectification with <55ns fall time. |
| VIN (Pin 23) | Main input supply | Primary power path; bypassed with RC filter (1Ω + 0.1µF) to suppress high-frequency noise. |
| INTVCC (Pin 21) | Internal 6V regulator output | Supplies gate drivers and control logic; requires ≥4.7µF ceramic bypass to SGND. |
| EXTVCC (Pin 22) | External bias input | Switchover at 5.4–5.7V enables efficient external powering of INTVCC, reducing dissipation. |
| SGND (Pin 5 & Exposed Pad) | Signal ground reference | Must connect small-signal components here; tied to PGND at single point to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters in variable-input systems like automotive start-stop. |
| Quad N-channel MOSFET synchronous drive | Enables full synchronous rectification in all modes, achieving up to 98% efficiency without external diodes. |
| Seamless mode transitions | Sub-200ns buck↔buck-boost↔boost handoff prevents output glitches during VIN crossing VOUT. |
| Selectable low-current operation | Burst Mode® (boost) and skip-cycle (buck) maintain >85% efficiency at 1% load without audible noise. |
| Integrated 6V LDO with EXTVCC switchover | Reduces thermal stress at high VIN by automatically sourcing INTVCC from external 5.5–6V rail when available. |
| Output overvoltage lockout | Hardware comparator triggers shutdown if VOSENSE exceeds 0.86V - protects downstream loads independently of loop stability. |
Applications
| Automotive Power Systems | Telecom DC Distribution |
|---|---|
Use Scenario: 12V battery-powered infotainment unit requiring stable 5V/3.3V rails despite cold-crank (4.5V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller regulating single output from variable automotive input. Use Value: Maintains regulation across 4V–36V input without mode switching artifacts, supporting ASIL-B functional safety requirements. |
Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 12V/24V to line cards with dynamic load steps. IC Role / Device Role / Timing Role: High-efficiency intermediate bus regulator with fast transient response and phase-lock capability. Use Value: Delivers 98% peak efficiency and ±7.5% PGOOD window for reliable hot-swap and redundancy management. |
| Industrial Battery-Powered Equipment | High-Power Portable Devices |
Use Scenario: Portable test instrument powered by 3S Li-ion (9–12.6V) needing regulated 15V output for analog front-end. IC Role / Device Role / Timing Role: Single-stage buck-boost controller eliminating need for pre-regulator + post-regulator cascade. Use Value: Reduces BOM count and board area by 40% vs dual-converter solution while maintaining ±1% output accuracy. |
Use Scenario: USB-C PD power bank delivering 20V/3A output from 2S/3S battery pack with input voltage crossing output. IC Role / Device Role / Timing Role: Bidirectional-capable buck-boost controller supporting both charging and discharging paths. Use Value: Enables single-inductor architecture with VOUT disconnected from VIN during shutdown, preventing reverse current leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4332-AEC1 | 3.5V–36V input, fixed 3.3V/5V/12V outputs; no adjustable VOUT or external compensation; AEC-Q100 Grade 1. | Targeted at cost-sensitive automotive modules requiring fixed outputs only; lacks FCB-selectable low-power modes. | Choose MPQ4332-AEC1 for production automotive ECUs where fixed output and qualification outweigh flexibility needs. |
| LTC3789EUH#PBF | Same pinout and feature set but adds programmable current limit, cycle-by-cycle current limiting, and enhanced light-load efficiency via improved Burst Mode®. | Preferred for high-reliability industrial systems requiring tighter current protection and lower standby current (1500µA vs 2400µA). | Choose LTC3789EUH#PBF when design requires programmable OCP or extended light-load efficiency beyond LTC3780EUH#PBF's capabilities. |
Compared with MPQ4332-AEC1, LTC3780EUH#PBF offers full output adjustability and flexible low-power mode selection; compared with LTC3789EUH#PBF, it provides identical core functionality at lower cost and complexity where advanced current limiting is unnecessary.
Availability
LTC3780EUH#PBF is available at Aetrix Electronics and suitable for automotive power systems, telecom DC distribution, and industrial battery-operated equipment requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC3780EUH#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC3780EUH#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in demanding automotive and infrastructure applications.
FAQ
What is the maximum input voltage rating for the LTC3780EUH#PBF?
The LTC3780EUH#PBF has an absolute maximum input voltage rating of 36V on the VIN pin. Operation is specified from 4V to 30V, with transient tolerance up to 36V for short durations. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3780EUH#PBF support synchronization to an external clock?
Yes, the LTC3780EUH#PBF supports external clock synchronization via the PLLIN pin (Pin 10). With internal 50kΩ termination to SGND, it accepts TTL- or CMOS-compatible signals to phase-lock the internal oscillator's rising edge to an external master clock.
How does the FCB pin configure operating modes in the LTC3780EUH#PBF?
The FCB pin (Pin 7) configures LTC3780EUH#PBF behavior: <0.8V enables forced continuous conduction mode; 0.85–5V selects skip-cycle mode (buck) or Burst Mode® (boost); >5.3V activates discontinuous conduction mode with constant frequency in both directions.
What is the purpose of the exposed pad on the LTC3780EUH#PBF QFN package?
The exposed pad (Pin 33) of the LTC3780EUH#PBF QFN package is electrically and thermally connected to SGND. It must be soldered to a PCB copper pour to achieve the specified θJA = 34°C/W and ensure proper signal grounding and thermal dissipation.
Can the LTC3780EUH#PBF regulate output voltage when input equals output?
Yes, the LTC3780EUH#PBF operates seamlessly in buck-boost mode when VIN ≈ VOUT, using four-switch topology to maintain regulation without dropout or discontinuity. Typical mode transition time is 200ns, ensuring stable output during crossover conditions.
LTC3780EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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):
- 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:
- 32-QFN (5x5)
LTC3780EUH#PBF FAQ
1.How can I place an order for LTC3780EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780EUH#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 LTC3780EUH#PBF reliable?
The price and inventory of LTC3780EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3780EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780EUH#PBF?
LTC3780EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780EUH#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 LTC3780EUH#PBF?
For technical support, including LTC3780EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780EUH#PBF requirements.
6.How does Aetrix verify that LTC3780EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3780EUH#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 LTC3780EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3780EUH#PBF?
All LTC3780EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780EUH#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 LTC3780EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3780EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3780EUH#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…
