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Analog Devices Inc. LTC3775EMSE#TRPBF
- Part No.:
- LTC3775EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3775EMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,595
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Product details
Overview
LTC3775EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, voltage-mode synchronous step-down DC/DC controller designed for wide-input industrial and telecom power supplies. It operates from 4.5V to 38V input, delivers output down to 0.6V, supports up to 1MHz switching frequency, features 30ns minimum on-time, and uses RDS(ON) or sense-resistor current sensing - enabling high step-down ratios in point-of-load converters powering FPGAs, ASICs, and DSPs.
For engineers reviewing the LTC3775EMSE#TRPBF datasheet, LTC3775EMSE#TRPBF pinout, LTC3775EMSE#TRPBF application, or LTC3775EMSE#TRPBF equivalent, key selection criteria include its programmable 250kHz–1MHz oscillator, ±0.75% reference accuracy over temperature, cycle-by-cycle peak current limit, leading-edge modulation architecture, and dual-package availability in thermally enhanced 16-lead MSOP.
Technical Context
The LTC3775EMSE#TRPBF implements voltage-mode control with patented line feedforward compensation, delivering fast line and load transient response via a high-bandwidth error amplifier (25MHz unity-gain crossover). Its leading-edge modulation architecture eliminates minimum pulse-width constraints imposed by traditional PWM comparators.
It integrates dual N-channel MOSFET drivers (TG/BG), an internal 5.2V LDO (INTVCC), and independent top/bottom current limit comparators configurable via external resistors on ILIMT and ILIMB pins. The controller supports both forced continuous conduction mode (FCCM) and pulse-skipping mode, selectable via the MODE/SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports 12V, 24V, and 28V industrial/telecom rails without pre-regulation. |
| VOUT Range | 0.6V to 0.8×VIN - enables sub-1V core supplies for modern processors with tight regulation. |
| Reference Accuracy | ±0.75% over –40°C to 85°C - ensures stable output under thermal stress in embedded systems. |
| Min On-Time | <30ns - allows >100:1 step-down ratio at 1MHz (e.g., 24V→0.24V), critical for high-VIN PoL designs. |
| Switching Frequency | 250kHz to 1MHz (programmable) - balances efficiency, size, and EMI in space-constrained applications. |
| Shutdown Current | 14μA typical - enables ultra-low-power standby in always-on industrial controllers. |
| Package | 16-Lead Plastic MSOP - compact footprint with exposed PGND pad for thermal management (θJA = 40°C/W). |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE), thermally enhanced with exposed PGND pad soldered to PCB. Pin 17 (exposed pad) is PGND and must be connected to power ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIMT (Pin 1) | Top-side current limit set point | Internal 100μA sink sets VIN–SENSE threshold; configures peak inductor current during TG conduction. |
| ILIMB (Pin 2) | Bottom-side current limit set point | Internal 10μA source sets PGND–SW threshold; enables reverse-current detection and bottom-FET overcurrent protection. |
| FB (Pin 3) | Error amplifier inverting input | Connects to VOUT divider; virtual ground node for Type 3 compensation network tied to COMP. |
| COMP (Pin 4) | Error amplifier output | Drives line feedforward multiplier and PWM comparator; RC network here determines loop stability. |
| SS (Pin 5) | Soft-start control | 1μA internal current charges external capacitor; regulates VFB during startup to prevent inrush. |
| FREQ (Pin 6) | Oscillator frequency set | Resistor to SGND programs free-running frequency (250kHz–1MHz); also accepts sync signal when MODE/SYNC is active. |
| SGND (Pin 7) | Signal ground reference | Low-noise return for FB, SS, COMP, and FREQ; must be Kelvin-connected near VOUT capacitor to avoid noise coupling. |
| BG (Pin 8) | Bottom gate driver output | Drives gate of low-side N-MOSFET from PGND to INTVCC; 1.0Ω pull-down ensures fast turn-off. |
| INTVCC (Pin 9) | Internal 5.2V LDO output | Powers control logic and BG driver; requires ≥4.7μF X5R ceramic bypass to PGND for stability. |
| SENSE (Pin 10) | Top-side current sense input | Accepts RDS(ON) voltage drop (SW-to-SW node) or sense resistor voltage for accurate current limiting. |
| VIN (Pin 11) | Main input supply | 4.5V–38V input rail; bypassed to PGND with ≥1μF ceramic capacitor to suppress high-frequency noise. |
| SW (Pin 12) | Switch node | Connects to source of top N-MOSFET; serves as return for BOOST charge pump and bottom-current comparator input. |
| TG (Pin 13) | Top gate driver output | Floating driver powered by BOOST; swings from SW to BOOST voltage to fully enhance high-side N-MOSFET. |
| BOOST (Pin 14) | Top gate driver supply | Charge-pump node decoupled to SW with 0.1μF ceramic; Schottky diode from INTVCC enables bootstrap operation. |
| MODE/SYNC (Pin 15) | Mode select / clock sync | Pull <1.2V for FCCM; pull >1.2V for pulse-skipping; accepts external clock for system-wide timing synchronization. |
| RUN/SHDN (Pin 16) | Enable/shutdown control | 1.22V enable threshold; 0.74V shutdown threshold with 140mV hysteresis; internal 1μA pull-up enables default start-up. |
| PGND (Exposed Pad) | Power ground return | Return path for BG driver and VIN/INTVCC bypass caps; electrically isolated from SGND to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Line feedforward compensation | Stabilizes modulator gain across 4.5V–38V input range, eliminating need for complex loop re-tuning when VIN varies. |
| Programmable cycle-by-cycle current limit | Independent top/bottom thresholds (via ILIMT/ILIMB resistors) enable precise inductor current control and reverse-current protection. |
| Leading-edge modulation architecture | Removes minimum pulse-width limitation - enables reliable operation at <30ns on-time even at 1MHz switching. |
| Thermally optimized MSOP package | Exposed PGND pad and θJA = 40°C/W allow >3A continuous output in compact layouts without heatsinks. |
| Pre-biased output startup support | Starts in pulse-skipping mode until SS reaches 0.54V, preventing reverse current flow into pre-charged VOUT. |
Applications
| Telecom Point-of-Load | Industrial FPGA Power |
|---|---|
|
Use Scenario: 24V backplane powering 1.2V/15A core rail for Xilinx Kintex-7 FPGA in remote radio unit. IC Role / Device Role / Timing Role: Voltage-mode synchronous buck controller regulating output with 30ns min-on-time to maintain regulation during 10A/μs load transients. Use Value: Fast line/load response (<5μs settling) and ±0.75% reference accuracy ensure FPGA logic stability across temperature and input ripple. |
Use Scenario: 12V input converted to 0.85V/12A for Intel Arria 10 SoC in factory automation PLC. IC Role / Device Role / Timing Role: High-efficiency step-down controller with RDS(ON) sensing and programmable 500kHz frequency to meet EMI Class B limits. Use Value: 94% peak efficiency at full load reduces thermal stress in sealed enclosures; soft-start prevents I2R inrush into large bulk capacitance. |
| Automotive ADAS Camera Module | Server DDR4 Memory Supply |
|
Use Scenario: 12V vehicle battery powering 1.8V/3A image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: Wide-VIN buck controller with shutdown current <14μA supporting ASIL-B functional safety requirements during sleep mode. Use Value: Robust UVLO (1.22V enable) and overvoltage protection prevent damage during load-dump transients; MSOP package withstands automotive vibration. |
Use Scenario: 5V intermediate bus stepped down to 1.2V/20A DDR4 memory rail in 1U server PSU. IC Role / Device Role / Timing Role: Synchronous controller driving discrete N-MOSFETs with cycle-by-cycle current limiting to handle 15A step loads. Use Value: Programmable current limit and pulse-skipping mode reduce light-load losses below 1% - extending server uptime per watt. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Fixed 600kHz frequency; no programmable min-on-time; integrated MOSFET drivers only (no external FET support). | Targeted at lower-power ≤10A applications; lacks RDS(ON) sensing and line feedforward for wide-VIN stability. | Select MP2918GQ-Z only for cost-sensitive, fixed-frequency ≤12V input designs where 30ns min-on-time and feedforward are unnecessary. |
| TPS53689TSSR | Three-level adaptive on-time control; supports 4.5V–24V VIN; includes PMBus interface and telemetry. | Designed for server VR13/VR14 compliance; requires digital configuration; higher BOM cost and layout complexity. | Choose TPS53689TSSR when digital monitoring, multi-phase capability, or strict VR13 spec compliance are required - not for analog-only industrial use. |
Compared with MP2918GQ-Z and TPS53689TSSR, the LTC3775EMSE#TRPBF uniquely combines programmable 250kHz–1MHz operation, <30ns on-time, analog voltage-mode control with feedforward, and discrete MOSFET flexibility - making it optimal for wide-input, high-transient, analog-controlled PoL systems where predictability and thermal efficiency are prioritized over digital configurability.
Availability
LTC3775EMSE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial FPGA power rails, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LTC3775EMSE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and communications markets.
The LTC3775EMSE#TRPBF belongs to Linear's high-efficiency DC/DC controller product line, engineered specifically for wide-input, high-step-down-ratio synchronous buck converters in harsh industrial and telecom environments.
FAQ
What is the minimum on-time specification for the LTC3775EMSE#TRPBF, and why does it matter?
The LTC3775EMSE#TRPBF has a guaranteed minimum on-time of less than 30ns. This enables extremely low duty cycles - critical for high step-down ratio applications such as converting 24V or 36V inputs to sub-1V outputs at 1MHz switching frequency. Unlike conventional controllers limited by oscillator resolution or comparator delays, the LTC3775EMSE#TRPBF's leading-edge modulation architecture avoids pulse-width constraints, ensuring reliable regulation even under worst-case VIN/VOUT combinations.
Can the LTC3775EMSE#TRPBF operate with pre-biased outputs, and how is this handled?
Yes, the LTC3775EMSE#TRPBF supports pre-biased output startup. During power-up, it automatically begins in pulse-skipping mode until the SS pin voltage reaches 0.54V - preventing reverse current flow into a pre-charged VOUT. Once SS exceeds 0.54V, the controller transitions to the mode selected by MODE/SYNC (FCCM or pulse-skipping) and resumes normal regulation. This behavior is built-in and requires no external circuitry.
How does the line feedforward compensation in the LTC3775EMSE#TRPBF improve transient response?
The LTC3775EMSE#TRPBF's patented line feedforward circuit dynamically adjusts the PWM comparator's sawtooth amplitude in proportion to VIN. This cancels the inherent variation in modulator gain across the 4.5V–38V input range, resulting in a constant loop gain regardless of input voltage. Consequently, the error amplifier's response remains consistent - delivering uniform line and load transient performance without requiring re-compensation when VIN changes.
What are the key differences between the MSOP (LTC3775EMSE#TRPBF) and QFN (LTC3775EUD#TRPBF) packages?
The LTC3775EMSE#TRPBF uses a 16-lead plastic MSOP package with θJA = 40°C/W, while the LTC3775EUD#TRPBF uses a 3mm × 3mm QFN with θJA = 68°C/W. The MSOP offers superior thermal performance in standard PCB layouts due to larger copper exposure and easier soldering, whereas the QFN provides higher power density but requires careful thermal pad soldering. Both share identical pinout and electrical specs - selection depends on thermal budget and assembly capability.
Does the LTC3775EMSE#TRPBF support both RDS(ON) and sense-resistor current sensing, and how are they configured?
Yes, the LTC3775EMSE#TRPBF supports both methods. For RDS(ON) sensing, connect SENSE directly to the switch node (SW); the controller measures voltage drop across the top MOSFET's channel resistance. For sense-resistor sensing, place a precision resistor between the top MOSFET's drain and SW, then connect SENSE to the resistor's drain-side terminal. The choice affects current limit accuracy: RDS(ON) is simpler and lossless but less accurate; sense resistors provide ±1% limit tolerance at the cost of added power loss.
LTC3775EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 1MHz
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3775EMSE#TRPBF FAQ
1.How can I place an order for LTC3775EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3775EMSE#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 LTC3775EMSE#TRPBF reliable?
The price and inventory of LTC3775EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3775EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3775EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3775EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3775EMSE#TRPBF?
LTC3775EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3775EMSE#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 LTC3775EMSE#TRPBF?
For technical support, including LTC3775EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3775EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3775EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3775EMSE#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 LTC3775EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3775EMSE#TRPBF?
All LTC3775EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3775EMSE#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 LTC3775EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3775EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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