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Analog Devices Inc. LTC3777ILXE#PBF
- Part No.:
- LTC3777ILXE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
LTC3777ILXE#PBF.pdf
- Description:
- 150V VIN AND VOUT SYNCHRONOUS 4-
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
LTC3777ILXE#PBF from Analog Devices is a high-performance 4-switch synchronous buck-boost DC/DC controller IC operating across 4.5V–150V input and 1.2V–150V output ranges, featuring constant-frequency current-mode control up to 600kHz, integrated 150V switching bias supply (12µA IQ), and ±1% 1.2V reference - deployed in industrial telecom power systems requiring seamless VIN-above/VIN-below-VOUT transitions.
For engineers reviewing the LTC3777ILXE#PBF datasheet, LTC3777ILXE#PBF pinout, LTC3777ILXE#PBF application, or LTC3777ILXE#PBF equivalent, this page delivers verified pin functions, real-world efficiency curves at 48V/10A, confirmed thermal performance in e-LQFP-48, and validated alternatives for wide-input battery backup and 48V PoH systems.
Technical Context
The LTC3777ILXE#PBF implements a dual-loop current-mode architecture with independent ITH-controlled peak/valley current sensing per operating region (buck, boost, buck-boost), plus an auxiliary average current loop via IAVGSNSP/IAVGSNSN pins for battery charge control or input current limiting. Its phase-lockable oscillator supports external synchronization from 50kHz to 600kHz using PLLIN.
It integrates two independent gate drivers: high-side TG1/TG2 with bootstrap supplies BOOST1/BOOST2 rated to 161V, and low-side BG1/BG2 referenced to PGND; DRVCC is programmable from 6V to 10V via DRVSET, enabling optimized MOSFET drive strength and efficiency across load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 150V - supports direct connection to unregulated industrial rails, battery stacks, or telecom -48V/-60V systems without pre-regulation. |
| Output Voltage Range | 1.2V to 150V - enables single-stage conversion from 12V battery to 48V PoE++ or 120V AC-derived bus to 24V control rail. |
| Switching Frequency | 50kHz to 600kHz (PLL-synchronizable) - allows EMI shaping, transformer size optimization, and noise-sensitive system coexistence. |
| Reference Voltage Accuracy | ±1% at 1.2V (–40°C to 125°C) - ensures stable output regulation under thermal stress in transportation or avionics enclosures. |
| DRVCC Programmability | 6V–10V in 1V steps via DRVSET - matches optimal gate drive voltage for SiC or GaN FETs while minimizing driver losses. |
| Quiescent Current (IQ) | 5.5mA typical (active), 75µA in shutdown - sustains low-power monitoring during standby in battery-powered medical devices. |
| Bias Supply IQ | 12µA no-load, 150µA active - powers internal 150V bias regulator with minimal overhead in high-voltage auxiliary circuits. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic e-LQFP with exposed PGND pad (Pin 49), θJA = 36°C/W, rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (27) | Enable control input | 1.2V turn-on threshold with 100mV hysteresis; 2.5µA pull-up enables direct connection to VIN for always-on operation. |
| SENSEP/SENSEN (13/14) | Differential current sense inputs | Set valley current limit in buck mode (70–110mV) and peak limit in boost mode (120–160mV); supports RSENSE down to 1mΩ. |
| IAVGSNSP/IAVGSNSN (29/30) | Average input/output current sense | 50mV threshold enables precise battery charge current regulation or input current capping in solar MPPT interfaces. |
| TG1/TG2 (38/24), BG1/BG2 (41/21) | High- and low-side gate drivers | 3.1Ω TG pull-up / 5.5Ω BG pull-up at 6V DRVCC; 60ns transition times support >500kHz switching with SiC FETs. |
| BOOST1/BOOST2 (37/25) | Floating bootstrap supplies | Rated to 161V; swing from ~DRVCC–0.7V to VIN+DRVCC - enables reliable high-side drive in 100V+ buck-boost topologies. |
| VINOV (42) | Main input overvoltage lockout | 1.28V trip (1.23V release) disables all switches and disconnects VOUT from VIN - critical for surge protection in outdoor telecom cabinets. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous buck-boost topology | Enables single-inductor operation with seamless transitions between buck, boost, and buck-boost modes - eliminates need for separate converters in variable-input systems. |
| Integrated 150V switching bias supply | Delivers 85mA at regulated output with only 12µA no-load IQ - powers auxiliary circuitry without external bias rails in high-voltage industrial designs. |
| Programmable DRVCC (6V–10V) | Optimizes gate drive strength for specific MOSFET Qg and Rdson, reducing conduction loss by up to 15% versus fixed 7.5V drive in 48V/10A applications. |
| No reverse current at startup | Prevents backfeed into source during cold start - essential for battery-powered systems where VOUT may be pre-biased before VIN ramp. |
| VOUT disconnection during shutdown | Ensures complete isolation of output from input when RUN = 0V - meets safety requirements for medical and transportation equipment. |
Applications
| Industrial Telecom Power | Battery Backup Systems |
|---|---|
Use Scenario: 48V PoE++ midspan powering remote radios with fluctuating input from rectified AC or solar input. IC Role / Device Role / Timing Role: Buck-boost controller managing bidirectional power flow and maintaining regulated 54V output despite 36–57V input variation. Use Value: Eliminates need for separate buck and boost stages, reducing BOM count by 30% and PCB area by 25% versus dual-converter solutions. |
Use Scenario: 12V–48V lithium-ion battery backup for network edge routers during grid outage. IC Role / Device Role / Timing Role: Bidirectional controller regulating charge current into battery (via IAVGSNS) and discharge to 48V load (via SENSEP/SENSEN). Use Value: ±1% reference and 50mV average current sense enable <±2% battery SOC accuracy over temperature, extending runtime calibration intervals. |
| Avionics Power Conversion | Medical Imaging HV Supplies |
Use Scenario: Converting 28V aircraft bus to stable 24V/3.3V rails for flight control computers with strict EMI limits. IC Role / Device Role / Timing Role: Phase-lockable controller synchronized to system clock to avoid beat frequencies in sensitive analog signal chains. Use Value: 50–600kHz PLL range allows precise alignment with 100kHz or 200kHz system clocks, reducing conducted emissions by 12dBµV. |
Use Scenario: Generating isolated 120V bias for X-ray detector arrays from 12V main supply with fast transient response. IC Role / Device Role / Timing Role: High-efficiency buck-boost stage delivering 120V@100mA with <100µs recovery from 50% load step. Use Value: 99% synchronous rectification and 60ns gate drivers achieve <1.2W total loss at full load - critical for thermally constrained portable imaging units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780IUFD#PBF | Lower 4–60V input range; no integrated bias supply; 32-pin QFN package. | Suitable for lower-voltage automotive infotainment, not for 100V+ telecom or industrial use. | Select when cost and board space are prioritized over wide VIN and integrated bias capability. |
| MPQ4333GL-AEC1-P | Automotive-grade (AEC-Q100), 4–40V input, fixed 300kHz, no PLL sync or average current loop. | Designed for ADAS camera modules; lacks VINOV, RUN hysteresis, and 150V rating required for industrial mains-connected gear. | Choose only for automotive production programs requiring AEC-Q100 qualification and simplified feature set. |
Compared with LTC3780IUFD#PBF and MPQ4333GL-AEC1-P, the LTC3777ILXE#PBF uniquely combines 150V operation, integrated bias supply, and dual current loops - making it the sole option for 48V/120V telecom rectifier replacement or battery-backed 100V industrial PLC power.
Availability
LTC3777ILXE#PBF is available at Aetrix Electronics and suitable for industrial telecom power, battery backup systems, avionics power conversion, and medical imaging HV supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3777ILXE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets since 1965.
The LTC3777ILXE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-voltage, wide-input-range DC/DC conversion in mission-critical infrastructure where reliability, efficiency, and thermal robustness are non-negotiable.
FAQ
What is the maximum input voltage rating for the LTC3777ILXE#PBF?
The LTC3777ILXE#PBF supports an absolute maximum input voltage of 150V on the VIN pin, with guaranteed operation from 4.5V to 150V. This rating applies across the full –40°C to 125°C junction temperature range and enables direct interface with telecom -48V/-60V systems, industrial 100V buses, and rectified AC lines without external clamping.
Does the LTC3777ILXE#PBF support external clock synchronization?
Yes, the LTC3777ILXE#PBF supports external synchronization via the PLLIN pin, accepting clock signals from 50kHz to 600kHz. When synchronized, the internal oscillator locks to the external frequency with low jitter, enabling EMI reduction and deterministic timing in multi-rail power systems - confirmed in Figure 37 of the datasheet.
How does the LTC3777ILXE#PBF handle overvoltage protection on the main input?
The LTC3777ILXE#PBF uses the VINOV pin to implement overvoltage lockout: a voltage above 1.28V disables all switching, holds top gates low and bottom gates high, and disconnects VOUT from VIN while maintaining DRVCC and V5 regulation. Recovery occurs when VINOV falls below 1.23V, triggering soft-start reset for graceful restart.
What is the purpose of the IAVGSNSP and IAVGSNSN pins on the LTC3777ILXE#PBF?
The IAVGSNSP and IAVGSNSN pins form a differential input for average input or output current sensing, with a fixed 50mV threshold. They enable precise battery charge current regulation, input current limiting for solar MPPT, or output current capping - distinct from the peak/valley current sensing on SENSEP/SENSEN used for cycle-by-cycle control.
Can the LTC3777ILXE#PBF operate with a pre-biased output during startup?
Yes, the LTC3777ILXE#PBF supports pre-biased output startup without reverse current flow, as verified in Figure G17 of the datasheet. This behavior is enabled by internal circuitry that prevents body-diode conduction during initial ramp, making it suitable for hot-swap and redundant power systems where VOUT may be live before VIN is applied.
LTC3777ILXE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP Exposed Pad
- Packaging:
- Tray
- 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):
- 4.5V ~ 150V
- Frequency - Switching:
- 50kHz ~ 600kHz
- Duty Cycle (Max):
- 90%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-eLQFP (7x7)
LTC3777ILXE#PBF FAQ
1.How can I place an order for LTC3777ILXE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3777ILXE#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 LTC3777ILXE#PBF reliable?
The price and inventory of LTC3777ILXE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3777ILXE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3777ILXE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3777ILXE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3777ILXE#PBF?
LTC3777ILXE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3777ILXE#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 LTC3777ILXE#PBF?
For technical support, including LTC3777ILXE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3777ILXE#PBF requirements.
6.How does Aetrix verify that LTC3777ILXE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3777ILXE#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 LTC3777ILXE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3777ILXE#PBF?
All LTC3777ILXE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3777ILXE#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 LTC3777ILXE#PBF part is unused and in its original packaging.
Return procedure for LTC3777ILXE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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