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Analog Devices Inc. LTC3780MPG#TRPBF
- Part No.:
- LTC3780MPG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3780MPG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,220
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Product details
Overview
LTC3780MPG#TRPBF from Analog Devices is a high-performance, synchronous 4-switch buck-boost controller designed for seamless voltage regulation where input may be above, below, or equal to output. It delivers ±1% output voltage accuracy (0.8V–30V), supports 200–400kHz phase-lockable switching, and achieves up to 98% efficiency in automotive, telecom, and battery-powered systems using external N-channel MOSFETs.
For engineers reviewing the LTC3780MPG#TRPBF datasheet, LTC3780MPG#TRPBF pinout, LTC3780MPG#TRPBF application, or LTC3780MPG#TRPBF equivalent, this page provides verified package mapping (24-lead SSOP, –55°C to 125°C), confirmed quad-N-MOSFET gate drive capability, FCB-selectable low-current modes, internal 6V LDO, and power-good monitoring with ±7.5% window.
Technical Context
The LTC3780MPG#TRPBF implements current-mode control with dual independent gate drivers (TG1/BG1 and TG2/BG2) enabling true 4-switch buck-boost operation across three regions: buck (VIN > VOUT), boost (VIN < VOUT), and buck-boost (VIN ≈ VOUT). Its architecture uses a single inductor and supports automatic mode transitions with ≤200ns dead-time management.
Control logic is governed by the FCB pin, which selects forced continuous, skip-cycle (buck), or Burst Mode® (boost) operation-each with distinct ITH threshold behavior and efficiency trade-offs. The internal error amplifier features 0.32mS transconductance and 0.6MHz GBW, while the PLLIN/PLLFLTR interface enables synchronization to external clocks or frequency tuning via DC voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V max - supports wide automotive battery transients and industrial DC rails without pre-regulation. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable regulation for precision analog or digital loads without trimming. |
| Switching Frequency | 200–400kHz, phase-lockable - enables EMI reduction via synchronization and avoids sensitive frequency bands. |
| Efficiency | Up to 98% - achieved via synchronous rectification and low-loss gate drive timing (TG rise/fall: 50/45ns). |
| Operating Temperature | –55°C to +125°C junction - qualified for extended-range military, aerospace, and harsh-environment applications. |
| Current Sense Threshold | Buck min: –6mV; Boost max: +185mV - enables accurate peak/valley current limiting across full load range. |
| Power Good Window | ±7.5% of setpoint - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
Package: 24-lead plastic SSOP (G package), exposed pad not present; thermal resistance θJA = 130°C/W; rated for –55°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (Pin 1) | Open-drain status output | Asserts low when VOSENSE deviates >±7.5% from 0.8V reference - used for system power sequencing and fault signaling. |
| SS (Pin 2) | Soft-start control | Accepts external capacitor to ramp ITH voltage linearly - prevents 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 reverse current detection. |
| ITH (Pin 5) | Error amplifier output & current limit control | Sets per-cycle current threshold; voltage range 0–2.4V directly scales current trip point. |
| VOSENSE (Pin 6) | Feedback input | Connects to resistor divider from VOUT - closes voltage regulation loop with 0.8V internal reference. |
| RUN (Pin 8) | Enable/disable control | Pull below 1.5V to shut down all switching and gate drivers - enables system-level power management. |
| FCB (Pin 9) | Mode selection input | Voltage-selectable: <0.8V = forced CCM; 0.85–5V = skip-cycle (buck) / Burst Mode® (boost); >5.3V = DCM. |
| PLLFLTR / PLLIN (Pins 10, 11) | Frequency control interface | PLLFLTR sets oscillator frequency (170–440kHz); PLLIN accepts external clock for synchronization. |
| TG1 / BG1 / TG2 / BG2 (Pins 14, 16, 18, 23) | Quad N-MOSFET gate drivers | Drive top/bottom switches of two half-bridges - supports discrete external FETs with 3A peak drive capability. |
| VIN / INTVCC / EXTVCC (Pins 21, 19, 20) | Power supply inputs | VIN powers controller core; INTVCC = internal 6V LDO; EXTVCC >5.7V disables LDO and powers IC externally. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch topology | Eliminates need for separate buck and boost stages - reduces BOM count, PCB area, and magnetic component cost. |
| Seamless mode transition | Automatic buck → buck-boost → boost handoff at VIN ≈ VOUT with no output disturbance or control-loop instability. |
| Selectable low-current operation | Burst Mode® (boost) and skip-cycle (buck) maintain >85% efficiency at 1% load - critical for standby power compliance. |
| Integrated protection functions | Output overvoltage lockout (0.84–0.88V at VOSENSE), foldback current limiting, and undervoltage reset (3.8–4V) prevent fault propagation. |
| VOUT disconnection during shutdown | Isolates output from input when RUN = low - prevents backfeed and enables true system power gating. |
Applications
| Automotive Infotainment Power Supply | Telecom DC-DC Intermediate Bus Converter |
|---|---|
|
Use Scenario: Regulating 12V battery input to stable 5V/3.3V rails for head-unit processors and displays under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck-boost controller managing dynamic VIN/VOUT relationship with automatic mode switching and ±7.5% PGOOD monitoring. Use Value: Maintains uninterrupted operation across full automotive voltage range without input pre-regulators or post-regulators. |
Use Scenario: Converting –48V telecom bus to +12V intermediate rail feeding downstream POL converters in base station equipment. IC Role / Device Role / Timing Role: High-efficiency, phase-lockable 4-switch controller synchronized to system clock to minimize conducted EMI in dense RF environments. Use Value: Achieves 96% efficiency at 10A load while meeting strict EN55022 Class B emissions due to deterministic switching frequency. |
| High-Power Portable Medical Device | Industrial PLC I/O Module Power |
|
Use Scenario: Powering FPGA, ADCs, and wireless transceivers from Li-ion battery pack (3.0–4.2V/cell) while maintaining fixed 3.3V/1.8V outputs across discharge cycle. IC Role / Device Role / Timing Role: Single-inductor buck-boost controller with Burst Mode® operation to extend battery runtime during sensor sleep cycles. Use Value: Delivers >89% efficiency at 50mA load and supports ultra-low quiescent current (55µA shutdown) for multi-day battery life. |
Use Scenario: Generating isolated 24V and 5V rails from unregulated 24–48V industrial DC supply subject to brownouts and surges. IC Role / Device Role / Timing Role: Robust controller with –55°C to +125°C rating, UVLO hysteresis, and foldback current limiting for factory-floor reliability. Use Value: Ensures continuous operation during 100ms dips to 18V input and withstands repeated 60V transients without latch-up or parameter drift. |
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 | Same architecture but QFN-32 package (5mm × 5mm), θJA = 34°C/W, rated –40°C to +125°C - higher thermal performance, smaller footprint. | Preferred for space-constrained, high-power-density designs requiring better thermal dissipation than SSOP allows. | Select when board layout prioritizes thermal management over extended temperature qualification. |
| LTC3891EMSE#TRPBF | Includes integrated 5V/200mA bias supply and 60V VIN rating; lacks PLL synchronization and has fixed 300kHz frequency - simplified BOM, lower integration level. | Suitable for cost-sensitive industrial applications where input voltage exceeds 36V and sync capability is unnecessary. | Choose when input transient robustness >36V and integrated bias supply reduce external component count. |
Compared with LTC3780MPG#TRPBF, the LTC3781IG#TRPBF offers superior thermal performance in a smaller package but sacrifices military-grade temperature range, while the LTC3891EMSE#TRPBF trades sync capability and wide VIN flexibility for integrated bias power and higher input voltage tolerance.
Availability
LTC3780MPG#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telecom intermediate bus, and industrial PLC power supply designs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3780MPG#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 LTC3780MPG#TRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, wide-input-range DC-DC conversion in mission-critical systems demanding reliability across extreme temperatures.
FAQ
What is the operating temperature range of the LTC3780MPG#TRPBF?
The LTC3780MPG#TRPBF is specified for a junction temperature range of –55°C to +125°C, making it suitable for extended industrial, aerospace, and defense applications where standard commercial or automotive-grade parts cannot operate reliably. This rating is validated per the manufacturer's MP-grade qualification test flow and appears in the official order information table.
Does the LTC3780MPG#TRPBF support synchronization to an external clock?
Yes, the LTC3780MPG#TRPBF supports external clock synchronization via the PLLIN pin (Pin 11), which accepts TTL/CMOS-compatible signals. When driven, the internal phase-locked loop forces alignment of the rising edge of the bottom gate driver (BG1/BG2) to the PLLIN rising edge - enabling deterministic EMI reduction and multi-phase interleaving in complex power systems.
How does the FCB pin configure low-power operation on the LTC3780MPG#TRPBF?
The FCB pin (Pin 9) configures three distinct low-power modes: voltages <0.8V enable forced continuous conduction mode; 0.85–5V select skip-cycle mode in buck operation or Burst Mode® in boost operation; and >5.3V activate discontinuous conduction mode with constant frequency. Each mode alters ITH hysteresis and switching behavior to optimize light-load efficiency without changing external components.
Can the LTC3780MPG#TRPBF drive both N-channel MOSFETs in a synchronous buck-boost configuration?
Yes, the LTC3780MPG#TRPBF integrates four independent N-channel gate drivers (TG1/BG1 and TG2/BG2) capable of driving high-side and low-side N-MOSFETs in both buck and boost legs. Each driver delivers 3A peak current with 45–55ns rise/fall times and built-in shoot-through prevention delays - eliminating need for external driver ICs or discrete level-shifters.
What protection features are integrated into the LTC3780MPG#TRPBF?
The LTC3780MPG#TRPBF includes output overvoltage lockout (triggered at 0.84–0.88V on VOSENSE), internal foldback current limiting, undervoltage lockout (3.8–4V on VIN), and thermal shutdown. It also provides VOUT disconnection during RUN-pin shutdown and open-drain PGOOD monitoring with ±7.5% window - collectively safeguarding downstream circuitry against common power faults.
LTC3780MPG#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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3780MPG#TRPBF FAQ
1.How can I place an order for LTC3780MPG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780MPG#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 LTC3780MPG#TRPBF reliable?
The price and inventory of LTC3780MPG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780MPG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3780MPG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780MPG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780MPG#TRPBF?
LTC3780MPG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780MPG#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 LTC3780MPG#TRPBF?
For technical support, including LTC3780MPG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780MPG#TRPBF requirements.
6.How does Aetrix verify that LTC3780MPG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3780MPG#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 LTC3780MPG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3780MPG#TRPBF?
All LTC3780MPG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780MPG#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 LTC3780MPG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3780MPG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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