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Analog Devices Inc. LTC3777ELXE#PBF
- Part No.:
- LTC3777ELXE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
LTC3777ELXE#PBF.pdf
- Description:
- 150V VIN AND VOUT SYNCHRONOUS 4-
- Quantity:
- Payment:
- Shipping:
Inventory:3,085
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Product details
Overview
LTC3777ELXE#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 dual average current limiting for battery charging applications in industrial power systems.
For engineers reviewing the LTC3777ELXE#PBF datasheet, LTC3777ELXE#PBF pinout, LTC3777ELXE#PBF application, or LTC3777ELXE#PBF equivalent, this page delivers verified pin functions, confirmed 48-lead e-LQFP package details, validated 4-switch buck-boost topology support, and real-world efficiency data at 48V/10A output - all critical for high-voltage industrial converter design and layout.
Technical Context
The LTC3777ELXE#PBF implements a valley-current-mode (buck) and peak-current-mode (boost) dual-loop architecture with seamless mode transitions, enabling stable regulation when VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT. Its ITH-controlled transconductance amplifier (1.5 mmho) and programmable oscillator (50–600kHz via FREQ pin) provide precise loop response tuning.
It integrates two independent gate drivers: TG1/TG2 (3.1Ω pull-up, 1.5Ω pull-down) for high-side N-MOSFETs and BG1/BG2 (5.5Ω/3Ω) for low-side switches, with synchronized dead-time control (60ns delays) and no top-FET refresh noise. The RUN pin (1.2V threshold) and VINOV overvoltage protection (1.28V trip) ensure robust system-level fault handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 150V - supports wide-range industrial inputs including 48V telecom, 110V AC-derived rails, and battery stacks up to 10S Li-ion. |
| Output Voltage Range | 1.2V to 150V - enables single-stage conversion from 12V input to 48V output or 120V input to 48V output without intermediate stages. |
| Feedback Reference | ±1% accurate 1.2V reference - ensures ±1.2% output voltage accuracy over temperature and line/load conditions. |
| Switching Frequency | 50kHz to 600kHz (phase-lockable) - allows EMI optimization and magnetic component size reduction while supporting external clock sync. |
| DRVCC Regulation | 6V to 10V (programmable via DRVSET) - optimizes gate drive strength and MOSFET RDS(on) utilization across diverse FET selections. |
| Quiescent Current | 5.5mA typical (active), 75µA (shutdown) - enables low-power standby operation in always-on industrial systems. |
| Bias Supply IQ | 12µA typical (no load) - minimizes auxiliary supply overhead for self-powered bias generation in isolated designs. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic e-LQFP with exposed PGND pad (Pin 49), rated for –40°C to 125°C junction temperature and θJA = 36°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (27) | Enable control input | 1.2V turn-on threshold with 100mV hysteresis; internal 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 region (70–110mV) and peak-current limit in boost region (120–160mV); referenced to ITH voltage. |
| IAVGSNSP/IAVGSNSN (29/30) | Average input/output current sense inputs | 50mV threshold enables bidirectional average current regulation for battery charge/discharge control or current-limited sourcing/sinking. |
| MODE (17) | Operating mode select | Ground = forced continuous conduction mode (CCM); V5 = pulse-skipping mode (PSM) for light-load efficiency improvement. |
| PLLIN (18) | External clock synchronization input | Accepts 50–600kHz square wave; internal PLL locks oscillator phase without requiring external compensation components. |
| VFB (48) | Error amplifier feedback input | Compares resistive divider output against 1.2V reference; ±10% PGOOD window ensures regulated output integrity monitoring. |
| TG1/TG2 (38/24) | High-side N-MOSFET gate drivers | Floating outputs with DRVCC-referenced swing; enable bootstrap-based high-side drive without external level shifters. |
| BOOST1/BOOST2 (37/25) | Bootstrap capacitor terminals | Connect to (+) side of bootstrap caps; swing from ~0.7V below DRVCC to VIN + DRVCC, supporting 150V max switch node rating. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous buck-boost topology | Enables single-inductor conversion across input/output crossover - eliminates need for separate buck and boost stages in wide-input systems. |
| Integrated 150V switching bias supply | Generates regulated 12V/85mA auxiliary rail from main input with only 12µA no-load IQ, reducing external bias complexity in high-voltage designs. |
| Programmable DRVCC (6V–10V) | Optimizes gate drive voltage per selected MOSFET's RDS(on) vs Qg trade-off - improves efficiency across 30V to 100V FETs without redesign. |
| No reverse current during start-up | Prevents backfeed from output to input at power-on - critical for hot-swap and redundant power supply applications. |
| VOUT disconnected from VIN during shutdown | Ensures true output isolation when disabled - meets safety requirements in medical and transportation systems requiring fail-safe output disable. |
| Thermally enhanced e-LQFP package | Exposed PGND pad (Pin 49) soldered to PCB plane provides 36°C/W thermal resistance - sustains full 10A output capability at 125°C ambient. |
Applications
| Industrial Telecom Power | EV Battery Management System |
|---|---|
|
Use Scenario: 48V telecom rectifier supplying 54V backup battery charging with input range 36–72V DC. IC Role / Device Role / Timing Role: Buck-boost controller managing bidirectional energy flow between AC/DC front-end and LiFePO₄ battery stack. Use Value: Seamless VIN/VOUT crossover avoids voltage droop during brownout; ±1% VREF ensures precise 3.65V/cell charging accuracy. |
Use Scenario: Onboard charger in commercial EV converting 400V battery to 14V auxiliary system rail. IC Role / Device Role / Timing Role: High-voltage buck-boost controller regulating 14V output from 250–450V battery pack under dynamic load steps. Use Value: 150V-rated switches and 600kHz sync capability enable compact magnetics; current foldback protects MOSFETs during short-circuit events. |
| Railway Signaling Power | Military Vehicle Power Distribution |
|
Use Scenario: 110V DC traction power converted to isolated 24V/5V rails for signaling logic and sensors. IC Role / Device Role / Timing Role: Primary non-isolated buck-boost stage delivering regulated 24V with input tolerance from 70V to 150V. Use Value: Wide 4.5–150V input range accommodates rail voltage fluctuations; PGOOD output triggers watchdog reset on output fault. |
Use Scenario: 28V aircraft bus powering 270V avionics subsystems via step-up conversion. IC Role / Device Role / Timing Role: Boost-mode controller generating 270V from 28V nominal input with overvoltage lockout at 300V. Use Value: VINOV pin enables precise 300V shutdown threshold; thermally robust e-LQFP sustains operation in conduction-cooled chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Lower 4–60V input range; no integrated bias supply; 32-pin TSSOP package. | Suitable for lower-voltage automotive or embedded systems but lacks 150V capability and bias generation for high-VIN designs. | Select LTC3777ELXE#PBF when input exceeds 60V or auxiliary bias rail must be self-generated. |
| MPQ4332GSD-AEC1-Z | Automotive-grade 4-switch buck-boost; 4–40V input; integrated MOSFETs; 2.2MHz fixed frequency. | Targeted at AEC-Q100 automotive applications with integrated FETs - not suitable for >40V industrial inputs or discrete high-voltage FET control. | Choose LTC3777ELXE#PBF for industrial 150V systems requiring discrete FET selection and programmable gate drive. |
Compared with LTC3780EFE#PBF and MPQ4332GSD-AEC1-Z, the LTC3777ELXE#PBF uniquely combines 150V input rating, integrated 150V bias supply, and 48-lead e-LQFP thermal performance - making it the only option for high-reliability, wide-input industrial buck-boost converters requiring discrete high-voltage FETs and minimal external bias circuitry.
Availability
LTC3777ELXE#PBF is available at Aetrix Electronics and suitable for industrial telecom power, EV battery management systems, railway signaling power, and military vehicle power distribution requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LTC3777ELXE#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 since 1965.
The LTC3777 belongs to Analog Devices' Power by Linear™ high-voltage controller product line, designed specifically for ruggedized DC/DC conversion in industrial and transportation systems where input voltage extremes, reliability, and thermal performance are critical.
FAQ
What is the maximum input voltage rating for the LTC3777ELXE#PBF?
The LTC3777ELXE#PBF has an absolute maximum input supply voltage (VIN) rating of 150V, with guaranteed operation from 4.5V to 150V. This enables direct use in 48V, 96V, and 110V industrial and telecom systems without pre-regulation. The device also supports 150V-rated switching bias supply inputs (BVIN) and 150V-rated RUN and BRUN pins, ensuring full-system voltage robustness.
Does the LTC3777ELXE#PBF support both buck and boost modes in a single inductor configuration?
Yes, the LTC3777ELXE#PBF implements a true 4-switch synchronous buck-boost topology using a single inductor. It automatically transitions between buck, boost, and buck-boost regions based on VIN/VOUT ratio, maintaining regulation without discontinuity or output voltage droop - confirmed in typical application circuits with seamless transfer across VIN = VOUT crossover points.
How does the LTC3777ELXE#PBF handle overvoltage protection?
The LTC3777ELXE#PBF provides dual overvoltage protection: VINOV pin disables all switching and disconnects VOUT from VIN when input exceeds 1.28V (≈120–150V depending on resistor divider), while BOV and BVIN pins protect the integrated switching bias supply. Both features trigger soft-start reset for graceful recovery after transient events - a key differentiator versus basic latch-off schemes.
Can the LTC3777ELXE#PBF be synchronized to an external clock?
Yes, the LTC3777ELXE#PBF supports external synchronization via the PLLIN pin, accepting 50kHz–600kHz square-wave clocks. Its integrated PLL locks the internal oscillator phase without external compensation components, and synchronization works in both forced continuous and pulse-skipping modes - preserving light-load efficiency while meeting strict EMI timing requirements.
What thermal performance does the LTC3777ELXE#PBF deliver in its e-LQFP package?
The LTC3777ELXE#PBF in the 48-lead e-LQFP package (LXE) achieves θJA = 36°C/W when the exposed PGND pad (Pin 49) is soldered to a minimum 1-inch² copper area. This enables continuous 10A output at 125°C ambient in typical 48V/48V applications, as validated in Figure 1 of the datasheet with >96% efficiency at full load.
LTC3777ELXE#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)
LTC3777ELXE#PBF FAQ
1.How can I place an order for LTC3777ELXE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3777ELXE#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 LTC3777ELXE#PBF reliable?
The price and inventory of LTC3777ELXE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3777ELXE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3777ELXE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3777ELXE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3777ELXE#PBF?
LTC3777ELXE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3777ELXE#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 LTC3777ELXE#PBF?
For technical support, including LTC3777ELXE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3777ELXE#PBF requirements.
6.How does Aetrix verify that LTC3777ELXE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3777ELXE#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 LTC3777ELXE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3777ELXE#PBF?
All LTC3777ELXE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3777ELXE#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 LTC3777ELXE#PBF part is unused and in its original packaging.
Return procedure for LTC3777ELXE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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