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Analog Devices Inc. LTC3780IG#TRPBF
- Part No.:
- LTC3780IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3780IG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
LTC3780IG#TRPBF from Analog Devices is a high-performance, synchronous 4-switch buck-boost DC/DC controller IC designed for seamless VIN-to-VOUT conversion across input voltages from 4V to 30V and output voltages from 0.8V to 30V. It delivers up to 98% efficiency using current-mode control, supports phase-lockable switching frequencies from 200kHz to 400kHz, and features quad N-channel MOSFET gate drivers with <80ns dead-time control-enabling automotive power systems, telecom DC distribution, and battery-powered industrial equipment.
For engineers reviewing the LTC3780IG#TRPBF datasheet, LTC3780IG#TRPBF pinout, LTC3780IG#TRPBF application, or LTC3780IG#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst Mode®, skip-cycle, forced continuous), real-world efficiency curves at 5A load, and precise thermal and protection behavior per Rev G specification.
Technical Context
The LTC3780IG#TRPBF implements a proprietary four-switch buck-boost topology with dual current-sense paths (SENSE+/SENSE–) and independent ITH-controlled peak/valley thresholds for buck and boost operation. Its constant-frequency current-mode architecture uses internal slope compensation and supports seamless mode transitions within ~200ns when VIN approaches VOUT.
It integrates an internal 6V LDO (INTVCC) with ±2% regulation, EXTVCC switchover at 5.7V, and programmable oscillator via PLLFLTR voltage (170–440kHz range). Fault protection includes output overvoltage lockout (0.84–0.88V at VOSENSE), foldback current limiting, and PGOOD monitoring with ±7.5% window and 2.5% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V continuous operation; absolute max 36V - supports wide automotive battery transients and telecom -48V derived rails. |
| Output Voltage Range | 0.8V to 30V adjustable via external resistor divider - enables single-controller solutions for 3.3V, 5V, 12V, 24V, or custom intermediate bus voltages. |
| Switching Frequency | 200kHz to 400kHz fixed or phase-locked; programmable via PLLFLTR voltage - allows EMI optimization and synchronization to system clocks. |
| Efficiency | Up to 98% at full load - achieved via synchronous rectification, low gate drive losses, and optimized dead-time control of TG/BG outputs. |
| Output Accuracy | ±1% over temperature (–40°C to 125°C) - ensures stable regulation in harsh environments without external trimming. |
| Protection Features | Output overvoltage lockout (VOVL), foldback current limiting, undervoltage reset (UVLO = 3.8–4.0V), and PGOOD with ±7.5% window - enables robust fault recovery in mission-critical systems. |
| Thermal Rating | Junction temperature range –40°C to +125°C (I-grade) - qualified for under-hood automotive and industrial control applications. |
Pinout & Package
Package: 24-Lead Plastic SSOP (G package), 5mm × 5mm exposed-pad QFN also available; LTC3780IG#TRPBF is the SSOP variant rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain power-good monitor | Asserts low when VOSENSE deviates >±7.5% from 0.8V reference - used for system sequencing and fault signaling. |
| SS (Pin 2) | Soft-start timing capacitor node | Controls ramp rate of ITH during startup; minimum 6.8nF required - prevents input surge current and inrush into output capacitors. |
| SENSE+ / SENSE– (Pins 3, 4) | Differential current sense inputs | Measure voltage across external RSENSE to set peak/valley current limits - enables accurate cycle-by-cycle current control in buck, boost, and buck-boost modes. |
| ITH (Pin 5) | Error amplifier output & current threshold control | 0–2.4V analog control of current limit; sets both peak (boost) and valley (buck) thresholds - central to mode transition and light-load behavior. |
| VOSENSE (Pin 6) | Feedback voltage input | Connects to resistor divider from VOUT; compared to 0.800V internal reference - determines regulated output voltage with ±1% accuracy. |
| RUN (Pin 8) | Enable/disable control input | Pulled down internally via 100kΩ; <1.5V disables switching, >2V enables - provides clean ON/OFF control with built-in hysteresis. |
| FCB (Pin 9) | Mode selection logic input | Voltage-selectable: <0.8V → forced continuous; 0.85–5V → skip-cycle (buck) / Burst Mode® (boost); >5.3V → DCM - enables dynamic efficiency optimization. |
| PLLFLTR / PLLIN (Pins 10, 11) | Frequency programming & sync inputs | PLLFLTR sets oscillator frequency (170–440kHz); PLLIN accepts external clock up to 400kHz - supports EMI reduction and multi-rail synchronization. |
| TG1/TG2, BG1/BG2 (Pins 13–16, 18, 22–24) | Quad N-MOS gate drivers | Drive top/bottom switches with <80ns propagation delay and matched rise/fall times - ensures precise dead-time control and minimizes shoot-through risk. |
| VIN / INTVCC / EXTVCC (Pins 21, 19, 20) | Main input, internal LDO, external bias supply | INTVCC = 6V ±2% regulated output; EXTVCC switchover at 5.7V - reduces power loss and heat generation when external bias is available. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch architecture | Enables bidirectional VIN/VOUT relationship (VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT) without transformer or multiple inductors - reduces BOM count and board area. |
| Seamless mode transition | Sub-200ns transition between buck, buck-boost, and boost regions - eliminates output glitches and maintains regulation during input transients (e.g., cold crank). |
| Selectable low-current modes | Burst Mode® (boost), skip-cycle (buck), and forced continuous modes selectable via FCB pin - achieves >85% efficiency at 10mA load without compromising transient response. |
| Integrated 6V LDO with EXTVCC switchover | Reduces power dissipation by disabling internal regulator when EXTVCC ≥5.7V - improves thermal performance in high-current designs. |
| Quad synchronous gate drive with dead-time control | Drives four external N-channel MOSFETs with matched timing and <80ns interlock delays - eliminates need for external gate driver ICs or discrete logic. |
| Robust protection suite | Includes output overvoltage lockout (0.84–0.88V), foldback current limiting, UVLO, and PGOOD with hysteresis - meets functional safety requirements for automotive and industrial use. |
Applications
| Automotive Power Systems | Telecom DC Distribution |
|---|---|
Use Scenario: Regulating 12V battery-derived rail to stable 5V/3.3V for infotainment, ADAS sensors, or body control modules during cold-crank (4.5V) or load-dump (36V) events. IC Role / Device Role: Primary buck-boost controller managing bidirectional voltage conversion with seamless mode transitions and ±7.5% PGOOD monitoring. Use Value: Eliminates need for pre-regulator stages or backup supplies - sustains operation across full automotive voltage range without brownouts or resets. |
Use Scenario: Converting –48V telecom supply to +12V intermediate bus for PoE switches, baseband units, or optical line cards requiring tight regulation and high efficiency. IC Role / Device Role: High-efficiency synchronous controller driving discrete MOSFETs in isolated or non-isolated buck-boost configuration. Use Value: Achieves >95% efficiency at 5A while supporting phase-locking to system clock - reduces thermal load and EMI in dense telecom chassis. |
| Industrial Battery-Powered Equipment | High-Power Portable Devices |
Use Scenario: Powering 24V motor drives or PLC I/O modules from 12–36V Li-ion battery packs with variable state-of-charge and load steps. IC Role / Device Role: Four-switch buck-boost controller with adjustable soft-start, current foldback, and thermal-aware shutdown. Use Value: Maintains regulated output during deep discharge (down to 4V) and handles 0→5A load steps with <100mV overshoot - extends runtime and improves reliability. |
Use Scenario: Supplying 12V/5A to portable test equipment, medical handhelds, or ruggedized tablets powered by multi-cell Li-ion batteries (10–28V range). IC Role / Device Role: Efficiency-optimized controller selecting Burst Mode® at light loads and forced continuous at full load via FCB pin. Use Value: Delivers >88% efficiency at 10mA and >96% at 5A - maximizes battery life while meeting fast transient requirements of digital loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3781IG#TRPBF | Pin-compatible upgrade with enhanced light-load efficiency, improved current-sense accuracy (±0.5%), and integrated MOSFET drivers for two-phase operation. | Preferred for new designs requiring tighter current regulation and lower standby current (<10µA vs 55µA). | Choose LTC3781IG#TRPBF if upgrading legacy LTC3780 designs or targeting sub-1% output current tolerance. |
| MPQ4332GSD-A-Z | Monolithic 4-switch buck-boost converter (integrated MOSFETs), 3.3–40V input, 0.8–24V output, fixed 350kHz frequency, no PLL or EXTVCC support. | Suitable for space-constrained, medium-power (≤3A) applications where integration outweighs flexibility. | Choose MPQ4332GSD-A-Z only when board area is critical and external MOSFET selection is unnecessary. |
Compared with LTC3780IG#TRPBF, LTC3781IG#TRPBF offers higher precision and lower quiescent current but same pinout and feature set; MPQ4332GSD-A-Z trades configurability for integration and reduced component count at lower current levels.
Availability
LTC3780IG#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, telecom DC distribution, and industrial battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC3780IG#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3780IG#TRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, wide-input-range DC/DC conversion in demanding environments where reliability, thermal resilience, and seamless mode transitions are critical.
FAQ
What is the maximum input voltage rating for the LTC3780IG#TRPBF?
The LTC3780IG#TRPBF has an absolute maximum input voltage rating of 36V. Continuous operation is specified from 4V to 30V. Exceeding 36V on the VIN pin may cause permanent damage, and operation above 30V should be limited to transient conditions such as automotive load dump, with appropriate clamping circuitry external to the LTC3780IG#TRPBF.
Does the LTC3780IG#TRPBF support synchronization to an external clock?
Yes, the LTC3780IG#TRPBF supports external clock synchronization via the PLLIN pin (Pin 11). When driven with a clean CMOS-level square wave up to 400kHz, the internal oscillator locks to the rising edge of the PLLIN signal. This capability enables EMI reduction through frequency dithering and coordinated switching across multiple power rails in complex systems using the LTC3780IG#TRPBF.
How does the FCB pin affect operating mode in buck versus boost configurations?
The FCB pin selects operating mode differently in buck and boost: below 0.8V it forces continuous conduction mode in both; between 0.85V and 5V it enables skip-cycle mode in buck and Burst Mode® in boost; above 5.3V it selects discontinuous conduction mode with constant frequency in both. This dual-context behavior is explicitly defined in the LTC3780IG#TRPBF datasheet Rev G and verified in typical performance curves.
What is the purpose of the STBYMD pin on the LTC3780IG#TRPBF?
The STBYMD pin controls whether the internal 6V LDO remains active during RUN-pin shutdown. When pulled to ground, it disables the LDO and pulls SS low - providing a single-point disable function. When biased between 2V and 5V (e.g., via resistor divider from VIN), it keeps INTVCC active to power external wake-up circuitry, enabling controlled restart sequences without recharging soft-start capacitors. This behavior is confirmed in the LTC3780IG#TRPBF pin function table.
Can the LTC3780IG#TRPBF operate with output voltages below 1V?
No, the LTC3780IG#TRPBF is not specified for output voltages below 0.8V. Its internal reference is trimmed to 0.800V ±1%, and the VOSENSE pin is designed to regulate based on that threshold. Attempting to set VOUT < 0.8V violates the feedback loop's operating range and results in loss of regulation accuracy and potential instability. For sub-1V applications, alternative controllers with lower reference voltages must be selected instead of the LTC3780IG#TRPBF.
LTC3780IG#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3780IG#TRPBF FAQ
1.How can I place an order for LTC3780IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780IG#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 LTC3780IG#TRPBF reliable?
The price and inventory of LTC3780IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3780IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780IG#TRPBF?
LTC3780IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780IG#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 LTC3780IG#TRPBF?
For technical support, including LTC3780IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780IG#TRPBF requirements.
6.How does Aetrix verify that LTC3780IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3780IG#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 LTC3780IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3780IG#TRPBF?
All LTC3780IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780IG#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 LTC3780IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3780IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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