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Analog Devices Inc. LTC3780IUH#TRPBF
- Part No.:
- LTC3780IUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3780IUH#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
LTC3780IUH#TRPBF from Analog Devices is a high-efficiency, synchronous 4-switch buck-boost controller supporting input voltages from 4V to 36V and output voltages from 0.8V to 30V. It operates in buck, boost, or buck-boost modes with seamless transitions, delivers up to 98% efficiency via quad N-channel MOSFET drive, and features ±1% output voltage accuracy and phase-lockable 200–400kHz switching frequency. It is used in automotive power systems where VIN may dip below or surge above VOUT.
For engineers reviewing the LTC3780IUH#TRPBF datasheet, LTC3780IUH#TRPBF pinout, LTC3780IUH#TRPBF application, or LTC3780IUH#TRPBF equivalent, key selection criteria include its single-inductor architecture, FCB-selectable low-current modes (Burst Mode® in boost, skip-cycle in buck), internal 6V LDO for gate drive, and robust fault protection including output overvoltage lockout and foldback current limiting.
Technical Context
The LTC3780IUH#TRPBF implements a constant-frequency current-mode control architecture with dual independent gate drivers (TG1/BG1 and TG2/BG2) enabling precise timing of four external N-channel MOSFETs. Its mode selection-buck, boost, or buck-boost-is determined dynamically by input-to-output voltage ratio and controlled via the FCB pin, with transition times under 250ns between operating regions.
It integrates an error amplifier with 0.32mS transconductance and 0.6MHz GBW, a programmable oscillator (200–400kHz) synchronized via PLLIN, and dedicated current sense comparators with adjustable thresholds (±150mV typical). The device supports both internal INTVCC regulation (5.7–6.3V) and external EXTVCC switchover at 5.4–5.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide automotive battery transients and telecom DC distribution rails. |
| VOUT Range | 0.8V to 30V - enables flexible system-level voltage generation without external DAC or reference scaling. |
| Efficiency | Up to 98% - achieved via synchronous rectification and optimized gate drive timing, reducing conduction and switching losses. |
| Output Accuracy | ±1% - ensures stable regulation across temperature and load, critical for sensitive analog or digital loads. |
| Switching Frequency | 200–400kHz (phase-lockable) - balances EMI performance, inductor size, and thermal management in space-constrained designs. |
| Current Sense Threshold | ±150mV (boost/buck) - sets precise peak/valley current limits for reliable foldback protection and accurate load monitoring. |
| PGOOD Threshold | ±7.5% of VOUT - provides deterministic power-good signaling for downstream sequencers and microcontrollers. |
Pinout & Package
The LTC3780IUH#TRPBF is housed in a 32-lead (5mm × 5mm) plastic QFN package with exposed pad (Pin 33 = SGND), rated for –40°C to +125°C operation and offering θJA = 34°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain status output | Asserts low when VOSENSE deviates >±7.5% from 0.8V reference - enables safe power sequencing and fault reporting. |
| SS (Pin 2) | Soft-start control | Accepts external capacitor to ramp ITH voltage linearly, limiting inrush current during startup. |
| SENSE+ / SENSE– (Pins 3, 4) | Differential current sense inputs | Monitor voltage across external RSENSE to regulate peak/valley inductor current - supports bidirectional sensing for reverse-current detection. |
| ITH (Pin 3) | Error amplifier output & current threshold | Controls PWM duty cycle via current comparator; voltage range 0–2.4V directly scales current limit. |
| VOSENSE (Pin 4) | Feedback input | Connects to resistor divider from VOUT; referenced to 0.8V internal bandgap - determines regulated output voltage. |
| SGND (Pin 5, Exposed Pad 33) | Signal ground reference | Reference for all small-signal pins; must be connected to PGND at single point to avoid noise coupling into feedback loop. |
| RUN (Pin 6) | Enable/disable control | Pulling below 1.5V shuts down all switching and gate drivers - enables system-level power management. |
| FCB (Pin 7) | Mode selection input | Voltage level selects operating mode: <0.8V = forced CCM, 0.85–5V = skip-cycle (buck)/Burst Mode® (boost), >5.3V = DCM. |
| PLLFLTR / PLLIN (Pins 8, 10) | Frequency programming & sync inputs | PLLFLTR sets oscillator frequency (200–400kHz); PLLIN accepts external clock for synchronization to system master clock. |
| STBYMD (Pin 11) | LDO keep-alive control | When pulled high, maintains INTVCC during RUN shutdown - powers wake-up circuitry without full restart. |
| BOOST1 / BOOST2 (Pins 14, 27) | Floating gate drive supplies | Provide boosted voltage for top-gate drivers TG1/TG2 - enable high-side N-MOSFET operation without external charge pumps. |
| TG1 / TG2 (Pins 15, 26) | Top gate drivers | Drive gates of high-side N-MOSFETs with rail-to-rail swing referenced to SW1/SW2 - ensure fast turn-on and low RDS(on) conduction. |
| SW1 / SW2 (Pins 17, 24) | Switch node connections | Interface to inductor and external MOSFET sources - require low-inductance layout and Schottky catch diodes for dead-time optimization. |
| BG1 / BG2 (Pins 18, 20) | Bottom gate drivers | Drive gates of low-side N-MOSFETs from SGND to INTVCC - support synchronous rectification and zero-voltage switching in buck-boost region. |
| PGND (Pin 19) | Power ground return | Return path for high-current MOSFET sources and input/output capacitors - must be low-impedance and separate from SGND except at single-point tie. |
| INTVCC (Pin 21) | Internal 6V LDO output | Supplies gate drivers and control logic; bypassed with ≥4.7µF ceramic capacitor - eliminates need for external bias supply in most applications. |
| EXTVCC (Pin 22) | External bias input | Switchover at 5.4–5.7V disables internal LDO - improves efficiency at high input voltages by sourcing gate drive from external rail. |
| VIN (Pin 23) | Main input supply | Primary power source (4–36V); requires RC filter (1Ω + 0.1µF) to suppress high-frequency noise coupling into control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch topology | Enables buck, boost, and buck-boost operation without mode-switching discontinuities - eliminates output voltage glitches during VIN transients. |
| Quad N-channel MOSFET synchronous drive | Supports optimal efficiency across full VIN/VOUT range by eliminating body-diode conduction losses - reduces heat sink requirements in high-power designs. |
| FCB-selectable low-current modes | Allows trade-off between light-load efficiency (Burst/skip-cycle) and output ripple/noise (forced CCM) - configurable per application without hardware change. |
| Internal 6V LDO with EXTVCC switchover | Reduces BOM count and improves system efficiency at high VIN - automatically selects lowest-loss bias source without external control logic. |
| Seamless mode transitions | Sub-250ns transition between buck, buck-boost, and boost regions - maintains regulation during rapid VIN changes (e.g., cold-crank to load-dump in automotive). |
| Integrated foldback current limiting & OVP | Protects downstream loads and MOSFETs during short-circuit or overvoltage events - latches off or auto-retries depending on fault duration and configuration. |
Applications
| Automotive Power Management | Telecom DC Distribution |
|---|---|
Use Scenario: Regulating 12V battery-derived supply to stable 5V/3.3V for infotainment ECUs during cranking (VIN = 5.5V) and load dump (VIN = 36V). IC Role / Device Role / Timing Role: 4-switch buck-boost controller maintaining continuous regulation across extreme automotive transients. Use Value: Eliminates need for pre-regulator stages or multiple converters - reduces board area and improves system reliability under ISO 16750 stress conditions. | Use Scenario: Converting -48V telecom rectifier output to +12V for optical line cards with variable load profiles. IC Role / Device Role / Timing Role: High-efficiency synchronous controller operating in boost mode with Burst Mode® for standby power reduction. Use Value: Achieves >95% efficiency at 10% load and >97% at full load - lowers cooling requirements and extends system uptime in dense rack environments. |
| Industrial Battery Systems | High-Power Portable Equipment |
Use Scenario: Managing Li-ion pack (10–28V) to deliver regulated 24V for motor drives and sensors in mobile robotics. IC Role / Device Role / Timing Role: Buck-boost controller with FCB-configured forced CCM to ensure low-noise, ripple-free supply during dynamic torque changes. Use Value: Maintains tight output regulation (<±1%) and fast transient response (<200µs) - prevents sensor drift and motor commutation errors. | Use Scenario: Powering 12V subsystems (cameras, displays) from variable 2–3S LiPo input (6–12.6V) in drones and handheld test equipment. IC Role / Device Role / Timing Role: Single-inductor buck-boost controller with soft-start and PGOOD signaling for safe power-up sequencing. Use Value: Enables compact, high-density power design with no external PMIC required - simplifies firmware boot sequence and reduces bill-of-materials cost. |
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 600kHz max frequency, integrated MOSFET drivers with enhanced shoot-through protection, improved light-load efficiency via Pulse Frequency Modulation (PFM). | Targeted at higher-frequency, lower-inductance designs requiring tighter EMI control and faster transient response. | Select when operating frequency >400kHz is needed or when optimizing for ultra-low quiescent current in battery-critical systems. |
| MPQ4333AGL-A-Z | Monolithic 4-switch buck-boost IC (integrated MOSFETs), fixed 3.5A current limit, 2.5–24V input, 0.8–24V output, no PLL sync or EXTVCC option. | Suitable for cost-sensitive, medium-power applications where board space is constrained and discrete MOSFET selection is undesirable. | Select when BOM simplification and smaller footprint outweigh need for external MOSFET flexibility, high-temperature operation, or precision sync capability. |
Compared with LTC3782IUH#TRPBF, the LTC3780IUH#TRPBF offers broader input range (4–36V vs 2.5–24V) and superior thermal performance in QFN (θJA = 34°C/W), while MPQ4333AGL-A-Z trades configurability for integration - making LTC3780IUH#TRPBF optimal for high-reliability, wide-input industrial and automotive systems requiring discrete FET control.
Availability
LTC3780IUH#TRPBF is available at Aetrix Electronics and suitable for automotive power management, telecom DC distribution, and industrial battery systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3780IUH#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 LTC3780IUH#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input-range DC/DC conversion in harsh environments where reliability, thermal performance, and seamless mode transitions are critical.
FAQ
What is the maximum input voltage rating for the LTC3780IUH#TRPBF?
The LTC3780IUH#TRPBF has an absolute maximum input voltage rating of 36V. Operation is specified from 4V to 30V, with transient tolerance up to 36V - making it suitable for 24V automotive and industrial systems experiencing load dump or surge events. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3780IUH#TRPBF support synchronization to an external clock?
Yes, the LTC3780IUH#TRPBF supports external clock synchronization via the PLLIN pin (Pin 10). When driven with a clean CMOS-compatible square wave, the internal oscillator locks to the external frequency with phase alignment of the bottom gate signals. This enables EMI reduction through frequency dithering or system-level timing coordination in multi-rail power architectures.
How does the FCB pin affect operating mode in buck versus boost configurations?
The FCB pin configures low-current behavior differently in each region: below 0.8V enables forced continuous conduction mode (CCM) in both buck and boost; 0.85–5V selects skip-cycle mode in buck and Burst Mode® in boost; above 5.3V activates discontinuous conduction mode (DCM) with constant frequency in both. This allows independent optimization of efficiency and noise per operational quadrant.
What thermal considerations apply to the LTC3780IUH#TRPBF in its QFN package?
The LTC3780IUH#TRPBF in the 32-lead QFN (UH) package has θJA = 34°C/W when mounted on a standard 4-layer PCB with full thermal pad soldering. The exposed pad (Pin 33) must be connected to SGND and thermally coupled to a large copper pour. Junction temperature must remain ≤125°C - derating is required above 85°C ambient unless additional heatsinking or airflow is provided.
Can the LTC3780IUH#TRPBF regulate output voltage when input equals output?
Yes, the LTC3780IUH#TRPBF operates seamlessly in buck-boost mode when VIN ≈ VOUT, using a unique four-switch topology that avoids the inefficiency and instability of traditional SEPIC or Ćuk converters. During this region, switches A/D and B/C alternate in precise timing sequences (transition time <250ns), maintaining regulation without dropout or discontinuity - ideal for applications like 12V-to-12V "pass-through" with active current limiting.
LTC3780IUH#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3780IUH#TRPBF FAQ
1.How can I place an order for LTC3780IUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780IUH#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 LTC3780IUH#TRPBF reliable?
The price and inventory of LTC3780IUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780IUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3780IUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780IUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780IUH#TRPBF?
LTC3780IUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780IUH#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 LTC3780IUH#TRPBF?
For technical support, including LTC3780IUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780IUH#TRPBF requirements.
6.How does Aetrix verify that LTC3780IUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3780IUH#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 LTC3780IUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3780IUH#TRPBF?
All LTC3780IUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780IUH#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 LTC3780IUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3780IUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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