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Analog Devices Inc. LTC3780MPG#PBF
- Part No.:
- LTC3780MPG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3780MPG#PBF.pdf
- Description:
- IC REG CTRLR BUCK-BOOST 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
LTC3780MPG#PBF from Analog Devices is a high-efficiency, synchronous 4-switch buck-boost controller operating from 4V to 36V input and supporting output voltages from 0.8V to 30V. It delivers ±1% output voltage accuracy, up to 98% efficiency via synchronous N-channel MOSFET drive, and seamless mode transitions between buck, buck-boost, and boost. It is used in automotive power systems where input voltage varies widely (e.g., cold-crank to load-dump conditions) and stable 12V rail generation is required.
For engineers reviewing the LTC3780MPG#PBF datasheet, LTC3780MPG#PBF pinout, LTC3780MPG#PBF application, or LTC3780MPG#PBF equivalent, key selection considerations include its –55°C to 125°C extended temperature rating, quad N-MOSFET gate drive capability, phase-lockable 200–400kHz switching frequency, and FCB-pin-selectable low-current modes (Burst Mode®, skip-cycle, forced CCM).
Technical Context
The LTC3780MPG#PBF implements a constant-frequency current-mode control architecture with independent sensing paths for buck and boost operation, enabling smooth transitions at VIN ≈ VOUT. Its dual-path error amplifier and ITH-controlled current limit allow precise regulation across all three operating regions using a single inductor.
It integrates an internal 6V LDO (INTVCC) for gate driver biasing and supports EXTVCC switchover above 5.7V. The controller features dedicated top- and bottom-gate drivers (TG1/TG2/BG1/BG2) with <100ns propagation delays, programmable soft-start via SS pin, and power-good monitoring with ±7.5% window on VOSENSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports automotive battery transients including cold-crank (4.5V) and load dump (36V). |
| Output Voltage Range | 0.8V to 30V - set by external resistor divider on VOSENSE; ±1% accuracy ensures tight regulation for sensitive loads. |
| Switching Frequency | 200kHz to 400kHz - phase-lockable via PLLIN; enables EMI reduction through synchronization with system clock. |
| Efficiency | Up to 98% - achieved via synchronous N-MOSFET drive and optimized gate timing (TG/BG rise/fall <60ns). |
| Operating Temperature | –55°C to 125°C - qualified per MIL-STD-883 for extended industrial and automotive under-hood applications. |
| Protection Features | Output overvoltage lockout (0.84–0.88V at VOSENSE), foldback current limiting, and PGOOD with ±7.5% window. |
| Package | 24-Lead Plastic SSOP - exposed pad not present; thermal resistance θJA = 130°C/W for standard PCB layout. |
Pinout & Package
Package: 24-Lead Plastic SSOP (G package), 0.635mm pitch, body size 8.65mm × 3.90mm. Pin 1 marked with dot; pin 7 (SGND) and pin 17 (PGND) are separate ground returns requiring single-point connection.
| 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 reporting. |
| SS (Pin 2) | Soft-start control | Capacitor-connected node; charges with 1.2µA current to ramp ITH and limit inrush - prevents input surge during startup. |
| SENSE+ / SENSE– (Pins 3, 4) | Differential current sense inputs | Measure voltage across external RSENSE to regulate peak/valley inductor current - enables accurate current limiting in all modes. |
| ITH (Pin 5) | Error amplifier output & current threshold | 0–2.4V analog control voltage setting current limit; also serves as compensation node for loop stability. |
| VOSENSE (Pin 6) | Feedback input | Connects to resistor divider from VOUT; compares against 0.8V internal reference - primary regulation point for output voltage. |
| RUN (Pin 8) | Enable/disable control | Pulled internally to SGND via 100kΩ; <1.5V disables switching and gate drivers - supports system-level power management. |
| FCB (Pin 9) | Mode selection input | Voltage-selectable: 0–0.75V → forced CCM; 0.85–5V → skip-cycle (buck) / Burst Mode® (boost); >5.3V → DCM with constant frequency. |
| PLLFLTR / PLLIN (Pins 10, 11) | Frequency programming interface | PLLFLTR sets oscillator frequency (170–440kHz) via DC voltage; PLLIN accepts external sync signal for EMI control. |
| BOOST1 / BOOST2 (Pins 13, 24) | Floating gate drive supplies | Provide bootstrapped bias for TG1/TG2 drivers - swing from ~VIN+6V (BOOST2) or ~VOUT+6V (BOOST1) to enable high-side N-MOSFET drive. |
| TG1 / TG2 (Pins 14, 23) | Top N-MOSFET gate drivers | Drive gates of switches A/C with INTVCC-referenced swing - support fast turn-on with 50ns rise time into 3300pF load. |
| SW1 / SW2 (Pins 15, 22) | Switch node connections | Connect to source terminals of high-side MOSFETs - SW1 ties to VOUT-side switch; SW2 ties to VIN-side switch. |
| BG1 / BG2 (Pins 16, 18) | Bottom N-MOSFET gate drivers | Drive gates of switches B/D from PGND to INTVCC - provide synchronous rectification with 45ns rise time. |
| PGND (Pin 17) | Power ground return | Low-impedance path for MOSFET source currents and RSENSE - must be connected directly to source pads and CIN negative terminal. |
| INTVCC (Pin 19) | Internal 6V regulator output | Supplies gate drivers and internal circuitry; bypassed with ≥4.7µF ceramic capacitor - shuts down when EXTVCC >5.7V. |
| EXTVCC (Pin 20) | External bias supply input | Accepts 5.7–7V input to power INTVCC and reduce thermal load - must remain below VIN to prevent backfeed. |
| VIN (Pin 21) | Main input supply | Primary power input (4–36V); requires RC filter (1Ω + 0.1µF) to damp high-frequency noise from switching nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor 4-switch topology | Enables VIN above, below, or equal to VOUT without polarity reversal - eliminates need for separate buck/boost ICs or complex power sequencing. |
| Quad N-channel MOSFET synchronous drive | Drives four external N-MOSFETs with matched timing (≤80ns cross-conduction delay) - maximizes efficiency and minimizes shoot-through risk. |
| Seamless buck/buck-boost/boost transition | Transition time <200ns at VIN ≈ VOUT - avoids output glitches or regulation loss during dynamic input changes (e.g., engine start). |
| Selectable low-current operating modes | Burst Mode® (boost) and skip-cycle (buck) reduce light-load quiescent current to 1.5mA - extends battery runtime in always-on systems. |
| Integrated 6V LDO with EXTVCC switchover | Reduces thermal stress by shifting bias supply to external source above 5.7V - improves reliability in high-power, high-temperature environments. |
| Power-good output with hysteresis | PGOOD asserts only when VOSENSE is within ±7.5% of target - provides clean, glitch-free enable signal for downstream processors or FPGAs. |
Applications
| Automotive Power Distribution | Industrial DC Power Supply |
|---|---|
|
Use Scenario: Generating stable 12V rail from vehicle battery (5–16V nominal, 4–36V transient range) for infotainment, ADAS sensors, and telematics modules. IC Role / Device Role / Timing Role: 4-switch buck-boost controller regulating output despite wide VIN variation and load steps up to 5A. Use Value: Eliminates need for pre-regulator stages; maintains regulation during cold-crank (4.5V) and load-dump (36V), reducing BOM count and board space. |
Use Scenario: Providing isolated 24V output from unregulated 18–32V industrial bus for PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: High-efficiency synchronous controller driving discrete N-MOSFETs with phase-locked 300kHz switching to meet CISPR-22 conducted EMI limits. Use Value: Achieves >96% efficiency at full load while enabling EMI filtering optimization via frequency synchronization. |
| Telecom Intermediate Bus Converter | Battery-Powered Test Equipment |
|
Use Scenario: Converting –48V telecom supply to +12V intermediate bus for digital signal processors and FPGA power domains. IC Role / Device Role / Timing Role: Negative-input capable buck-boost controller (with inverted input configuration) delivering regulated 12V at 10A continuous. Use Value: Supports bipolar input configurations without external level-shifting; maintains ±1% output accuracy across temperature and line/load variations. |
Use Scenario: Powering portable oscilloscope front-end amplifiers and ADCs from 2-cell Li-ion (6–8.4V) while maintaining 5V/3.3V rails. IC Role / Device Role / Timing Role: Low-quiescent-current buck-boost controller using Burst Mode® to achieve 1.5mA shutdown current and extend battery life. Use Value: Enables >12-hour runtime on 5000mAh battery; soft-start prevents voltage droop during wake-up from deep sleep. |
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#PBF | Pin-compatible upgrade with improved light-load efficiency (Burst Mode® II), lower IQ (800µA), and enhanced current-sense accuracy (±1.5% vs ±2%). | Preferred for new designs requiring longer battery life or tighter current-limit tolerance in precision power supplies. | Select LTC3781IG#PBF when upgrading legacy LTC3780 designs for lower standby power or higher current-sense fidelity. |
| MAX20096ATPA/VY+ | Automotive-grade 4-switch controller with integrated gate drivers, 3.5V–42V input, but fixed 2.2MHz frequency and no PLL sync capability. | Suitable for space-constrained automotive modules where high-frequency operation reduces inductor size, but lacks frequency flexibility. | Choose MAX20096ATPA/VY+ when board area is critical and fixed 2.2MHz operation meets EMI requirements without synchronization. |
Compared with LTC3780MPG#PBF, the LTC3781IG#PBF offers superior light-load performance and measurement accuracy for next-gen designs, while the MAX20096ATPA/VY+ trades frequency agility for integration and smaller magnetics - neither is pin-compatible, but both address overlapping buck-boost use cases with distinct trade-offs.
Availability
LTC3780MPG#PBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC power supplies, telecom intermediate bus converters, and battery-powered test equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3780MPG#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 industrial, automotive, communications, and healthcare markets.
The LTC3780MPG#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-reliability, wide-input-range DC/DC conversion in harsh environments such as automotive under-hood and industrial control systems.
FAQ
What is the operating temperature range of the LTC3780MPG#PBF?
The LTC3780MPG#PBF is specified for operation from –55°C to 125°C junction temperature and is tested and guaranteed across this full range. This extended rating makes it suitable for automotive under-hood applications and industrial environments where ambient temperatures exceed standard commercial or industrial grades. Its thermal design uses θJA = 130°C/W in the 24-lead SSOP package.
Does the LTC3780MPG#PBF support synchronization to an external clock?
Yes, the LTC3780MPG#PBF supports external clock synchronization via the PLLIN pin (Pin 11). When driven with a clean CMOS or LVDS clock signal, the internal oscillator locks to the incoming frequency with minimal jitter. The PLLFLTR pin (Pin 10) can also be used to set a fixed frequency from 170kHz to 440kHz using a DC voltage, offering flexible EMI management for the LTC3780MPG#PBF.
How does the FCB pin configure operating modes in the LTC3780MPG#PBF?
The FCB pin (Pin 9) selects low-current operation modes: 0–0.75V enables forced continuous conduction mode (CCM); 0.85–5V enables skip-cycle mode in buck and Burst Mode® in boost; >5.3V enables discontinuous conduction mode (DCM) with constant frequency. These settings are confirmed in the LTC3780MPG#PBF datasheet Rev G, Figure 6 and Electrical Characteristics table.
Can the LTC3780MPG#PBF drive external N-channel MOSFETs without level-shifting components?
Yes, the LTC3780MPG#PBF integrates dedicated high-side gate drivers (TG1/TG2) with internal floating bootstrap supplies (BOOST1/BOOST2), enabling direct drive of N-channel MOSFETs in both high-side positions without external level shifters. Its synchronous bottom drivers (BG1/BG2) operate from PGND to INTVCC, completing full N-MOSFET control for the 4-switch topology in the LTC3780MPG#PBF.
What protection features are built into the LTC3780MPG#PBF?
The LTC3780MPG#PBF includes output overvoltage lockout (triggered at 0.84–0.88V on VOSENSE), foldback current limiting based on SENSE+/SENSE– differential voltage, undervoltage lockout (UVLO at 3.8–4.0V on VIN), and a power-good output (PGOOD) with ±7.5% regulation window. These protections are fully integrated and require no external components to function in the LTC3780MPG#PBF.
LTC3780MPG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- 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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3780MPG#PBF FAQ
1.How can I place an order for LTC3780MPG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3780MPG#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 LTC3780MPG#PBF reliable?
The price and inventory of LTC3780MPG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3780MPG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3780MPG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3780MPG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3780MPG#PBF?
LTC3780MPG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3780MPG#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 LTC3780MPG#PBF?
For technical support, including LTC3780MPG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3780MPG#PBF requirements.
6.How does Aetrix verify that LTC3780MPG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3780MPG#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 LTC3780MPG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3780MPG#PBF?
All LTC3780MPG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3780MPG#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 LTC3780MPG#PBF part is unused and in its original packaging.
Return procedure for LTC3780MPG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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