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Analog Devices Inc. LTC3780EUH#TRPBF
- Part No.:
- LTC3780EUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3780EUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
LTC3780EUH#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 (0.8V–30V), supports 200kHz–400kHz phase-lockable fixed-frequency operation, and achieves up to 98% efficiency with quad N-channel MOSFET drive in automotive and telecom power systems.
For engineers reviewing the LTC3780EUH#TRPBF datasheet, LTC3780EUH#TRPBF pinout, LTC3780EUH#TRPBF application, or LTC3780EUH#TRPBF equivalent, this controller provides seamless buck/boost/buck-boost mode transitions, integrated current-mode control, programmable low-current modes (Burst, Skip-Cycle, Forced CCM), and robust fault protection including output overvoltage lockout and foldback current limiting.
Technical Context
The LTC3780EUH#TRPBF implements a proprietary current-mode architecture with dual independent gate drivers (TG1/BG1 for buck path, TG2/BG2 for boost path) and dynamic mode transition logic that ensures continuous regulation across VIN/VOUT crossover. Its error amplifier features 0.6MHz GBW and 0.32mS transconductance, while the ITH pin serves as both current threshold control and compensation node.
Operating mode selection is determined by the FCB pin voltage: <0.8V enables forced continuous conduction mode (CCM); 0.85–5V selects skip-cycle (buck) or Burst Mode® (boost); >5.3V activates constant-frequency discontinuous conduction mode (DCM). The internal 6V LDO powers gate drivers and control circuitry, with automatic switchover to EXTVCC when >5.7V is applied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V operating, 36V absolute max - supports wide-range battery and industrial bus inputs without external pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable regulation for precision analog or digital loads without post-conversion trimming. |
| Switching Frequency | 200kHz to 400kHz, phase-lockable via PLLIN - enables EMI reduction through synchronization and predictable thermal design. |
| Peak Efficiency | Up to 98% - achieved via synchronous rectification and low-loss gate drive, reducing thermal load in high-power density designs. |
| Current Sense Threshold | –150mV to +185mV range - supports bidirectional current sensing and reverse-current detection for battery backup and regenerative applications. |
| Power Good Window | ±7.5% output voltage monitoring - provides reliable system-level power sequencing and fault signaling without external comparators. |
| Thermal Performance | θJA = 34°C/W (QFN package) - enables high-current operation at elevated ambient temperatures with minimal heatsinking. |
Pinout & Package
The LTC3780EUH#TRPBF is housed in a 32-lead (5mm × 5mm) plastic QFN package with exposed pad (Pin 33 = SGND), optimized for thermal dissipation and high-density PCB layouts. The exposed pad must be soldered to PCB ground for electrical integrity and rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 30) | Open-drain power-good indicator | Asserts low when VOUT deviates >±7.5% from setpoint - used for system enable/disable sequencing and fault reporting. |
| SS (Pin 31) | Soft-start timing capacitor connection | Controls inrush current ramp rate during startup; minimum 6.8nF required to limit peak input surge. |
| SENSE+ / SENSE– (Pins 1/2) | Differential current sense inputs | Monitor bidirectional inductor current via external shunt; enable reverse-current detection and cycle-by-cycle current limiting. |
| ITH (Pin 3) | Error amplifier output & current threshold control | 0–2.4V voltage sets peak/valley current limits; also serves as compensation node for loop stability tuning. |
| VOSENSE (Pin 4) | Feedback voltage input | Connects to resistor divider from VOUT; referenced to 0.800V internal bandgap for ±1% regulation accuracy. |
| RUN (Pin 6) | Enable/shutdown control | Pull below 1.5V to disable switching; internal 100kΩ pull-down allows simple ON/OFF control with open-drain logic. |
| FCB (Pin 7) | Low-current mode selector | Voltage level selects operating mode: <0.8V = forced CCM, 0.85–5V = skip/Burst, >5.3V = constant-freq DCM. |
| PLLFLTR / PLLIN (Pins 8/10) | Frequency programming & sync inputs | PLLFLTR sets oscillator frequency (170–440kHz); PLLIN accepts external clock for EMI-sensitive or multi-rail synchronized systems. |
| TG1/TG2, BG1/BG2 (Pins 15/26, 17/24, 18/20, 20/22) | Quad N-MOSFET gate drivers | Drive four external switches with 50ns rise/fall times and <80ns dead-time delays - eliminates need for external driver ICs. |
| VIN / INTVCC / EXTVCC (Pins 23/21/22) | Main input, internal LDO, external bias supply | INTVCC = 6V regulated output (5.7–6.3V); EXTVCC switchover at 5.7V reduces power loss in high-input-voltage applications. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck and boost converters - reduces BOM count, board area, and magnetic component cost in wide-input-range systems. |
| Seamless mode transition | Sub-200ns buck ↔ buck-boost ↔ boost transitions prevent output glitches or regulation loss when VIN crosses VOUT - critical for automotive cold-crank and battery discharge scenarios. |
| Programmable low-load efficiency modes | Burst Mode® (boost) and skip-cycle (buck) reduce light-load quiescent current to 1.5mA - extends runtime in always-on telecom or IoT edge devices. |
| Integrated fault protection | Output overvoltage lockout (0.84–0.88V at VOSENSE), foldback current limiting, and undervoltage reset (3.8–4.0V) provide self-contained safety without external supervision circuits. |
| Robust gate drive architecture | Quad 3A peak gate drivers with matched propagation delays and built-in shoot-through prevention - supports high-side and low-side N-MOSFETs without external level shifters. |
Applications
| Automotive Power Systems | Telecom DC Distribution |
|---|---|
|
Use Scenario: 12V battery-powered infotainment head unit requiring stable 5V/3.3V rails during cold-crank (4.5V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Primary buck-boost controller managing single-inductor conversion from variable battery to regulated outputs. Use Value: Maintains regulation across full automotive voltage range without input pre-regulator or post-regulator stages, reducing system complexity and cost. |
Use Scenario: 48V telecom shelf supplying 12V intermediate bus to downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter delivering up to 5A with tight output tolerance and fast transient response. Use Value: 98% peak efficiency minimizes heat generation in densely packed chassis; ±7.5% PGOOD window enables reliable hot-swap sequencing. |
| Industrial Battery Backup | High-Power Portable Equipment |
|
Use Scenario: Uninterruptible power supply (UPS) maintaining 24V output from Li-ion battery (25–32V) or AC adapter (18–28V) with seamless switchover. IC Role / Device Role / Timing Role: Bidirectional-capable controller supporting both charging (buck) and discharging (boost) paths via shared inductor. Use Value: Reverse-current detection and bidirectional current sensing enable safe battery isolation and charge termination without additional sense amplifiers. |
Use Scenario: Portable medical monitor powered by 3-cell Li-ion (9–12.6V) requiring stable 3.3V/5V/12V rails for display, sensors, and wireless comms. IC Role / Device Role / Timing Role: Single-chip solution replacing multiple discrete regulators to meet size, weight, and battery life targets. Use Value: Forced CCM mode ensures low-noise output for sensitive analog front-ends; Burst Mode® extends standby time to >72 hours on single charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3782IUH#TRPBF | Higher 125°C junction rating, identical pinout and feature set - direct drop-in replacement for extended temperature environments. | Suitable for under-hood automotive or industrial control cabinets where ambient exceeds 85°C. | Select when operating junction temperature must exceed 85°C; no layout or firmware changes required. |
| MP2918GL-Z | Lower 2.5A gate drive capability, fixed 300kHz frequency, no PLL sync or Burst Mode - reduced feature set but lower cost. | Applicable in cost-sensitive consumer electronics where wide VIN range and advanced low-load modes are not required. | Choose for simplified designs with fixed frequency and moderate current demands; verify thermal margin due to lower drive strength. |
Compared with LTC3780EUH#TRPBF, the LTC3782IUH#TRPBF offers identical functionality with extended temperature support, while the MP2918GL-Z trades programmability and efficiency features for lower BOM cost - making the LTC3780EUH#TRPBF optimal for high-reliability, thermally constrained, or EMI-sensitive applications demanding full feature control.
Availability
LTC3780EUH#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, telecom DC distribution, and industrial battery backup applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3780EUH#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 LTC3780EUH#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for wide-input-range, high-reliability power conversion in mission-critical systems where seamless mode transitions and robust fault protection are essential.
FAQ
What is the maximum input voltage rating for the LTC3780EUH#TRPBF?
The LTC3780EUH#TRPBF has an absolute maximum input voltage rating of 36V. It operates continuously from 4V to 30V, making it suitable for 12V and 24V automotive and industrial systems with transient overvoltage margins. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3780EUH#TRPBF support synchronization to an external clock?
Yes, the LTC3780EUH#TRPBF supports external clock synchronization via the PLLIN pin (Pin 10). When driven with a clean CMOS or LVDS clock signal, the internal oscillator locks to the external frequency, enabling EMI reduction and multi-rail timing coordination in complex power architectures.
How does the FCB pin configure low-current operation modes in the LTC3780EUH#TRPBF?
The FCB pin (Pin 7) configures three distinct low-current modes: <0.8V enables forced continuous conduction mode; 0.85–5V selects skip-cycle (buck) or Burst Mode® (boost); >5.3V activates constant-frequency discontinuous conduction mode. Each setting directly determines gate drive behavior and light-load efficiency strategy.
What is the purpose of the SENSE+ and SENSE– pins on the LTC3780EUH#TRPBF?
The SENSE+ and SENSE– pins (Pins 1 and 2) form a differential current sense interface for the external shunt resistor. They enable precise cycle-by-cycle current limiting, bidirectional current monitoring, and reverse-current detection - critical for battery backup, regenerative braking, and fault-safe operation in the LTC3780EUH#TRPBF.
Can the LTC3780EUH#TRPBF operate with input voltage equal to output voltage?
Yes, the LTC3780EUH#TRPBF is explicitly designed for buck-boost operation where VIN equals VOUT. Its proprietary control architecture ensures seamless, glitch-free transitions between buck, buck-boost, and boost regions - maintaining regulation even during VIN/VOUT crossover in applications like automotive start-stop systems.
LTC3780EUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3780EUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780EUH#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 LTC3780EUH#TRPBF reliable?
The price and inventory of LTC3780EUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780EUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3780EUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780EUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780EUH#TRPBF?
LTC3780EUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780EUH#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 LTC3780EUH#TRPBF?
For technical support, including LTC3780EUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780EUH#TRPBF requirements.
6.How does Aetrix verify that LTC3780EUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3780EUH#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 LTC3780EUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3780EUH#TRPBF?
All LTC3780EUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780EUH#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 LTC3780EUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3780EUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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