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Analog Devices Inc. LTC3775EMSE#PBF
- Part No.:
- LTC3775EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3775EMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:466
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Product details
Overview
LTC3775EMSE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, voltage-mode synchronous step-down DC/DC controller driving all-N-channel MOSFETs from 4.5V to 38V input. It features 30ns minimum on-time, ±0.75% 0.6V reference accuracy over temperature, and programmable 250kHz–1MHz switching frequency. Used in telecom power supplies for precise 1.2V/15A point-of-load regulation.
For engineers reviewing the LTC3775EMSE#PBF datasheet, LTC3775EMSE#PBF pinout, LTC3775EMSE#PBF application, or LTC3775EMSE#PBF equivalent, key selection factors include RDS(ON) current sensing capability, cycle-by-cycle peak current limit programming via ILIMT/ILIMB pins, forced continuous vs pulse-skipping mode control, and thermally enhanced MSOP-16 package with exposed PGND pad.
Technical Context
The LTC3775EMSE#PBF implements leading-edge modulation voltage-mode control with patented line feedforward compensation, enabling fast line and load transient response. Its error amplifier delivers 25MHz unity-gain bandwidth and 80dB open-loop gain, supporting Type 3 compensation networks for stable loop behavior across wide input ranges.
It integrates dual high-current gate drivers (TG/BG) with 2.5Ω pull-up and 1.0–1.5Ω pull-down on-resistances, and provides independent top/bottom current limit programming via internal 100μA sink (ILIMT) and 10μA source (ILIMB) currents. The device supports pre-biased start-up and output overvoltage protection via dedicated MAX comparator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports wide-input industrial and telecom power rails without external regulators. |
| Reference Voltage | 0.6V ±0.75% over temperature - enables accurate output regulation down to 0.6V with tight tolerance. |
| Min On-Time | <30ns - allows high step-down ratios (e.g., 12V→1.2V at 500kHz) without duty-cycle limitation. |
| Switching Frequency | 250kHz to 1MHz, programmable via FREQ pin resistor - balances efficiency, size, and EMI in compact designs. |
| Shutdown Current | 14μA typical - minimizes system standby power in battery-backed or energy-sensitive applications. |
| Current Sensing | RDS(ON) or sense resistor options - maximizes efficiency while allowing high-accuracy current limiting. |
| Package | 16-Lead Plastic MSOP with exposed PGND pad - provides low thermal resistance (θJA = 40°C/W) for high-power density layouts. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MSE), thermally enhanced with exposed PGND pad soldered to PCB for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIMT (Pin 1) | Top-side current limit set point | 100μA internal sink current sets VIN–SENSE threshold; configures peak current limit for upper MOSFET. |
| ILIMB (Pin 2) | Bottom-side current limit set point | 10μA internal source current sets PGND–SW threshold; configures peak current limit for lower MOSFET. |
| FB (Pin 3) | Error amplifier inverting input | Connects to resistive divider from VOUT; virtual ground node for precision feedback control. |
| COMP (Pin 4) | Error amplifier output | Drives compensation network to FB; interfaces with line feedforward circuit for stable voltage-mode loop. |
| SS (Pin 5) | Soft-start control | 1μA internal current source charges external capacitor; ramps VOUT linearly from 0V to final value. |
| FREQ (Pin 6) | Oscillator frequency set | Resistor to SGND programs free-running frequency from 250kHz to 1MHz; supports external sync via MODE/SYNC. |
| SGND (Pin 7) | Signal ground reference | Kelvin return for FB, SS, COMP, and MODE/SYNC; must be isolated from PGND to avoid noise coupling. |
| BG (Pin 8) | Bottom gate driver output | Drives gate of synchronous rectifier MOSFET from PGND to INTVCC; 1.0Ω pull-down ensures fast turn-off. |
| INTVCC (Pin 9) | Internal 5.2V LDO output | Powers gate drivers and control logic; requires ≥4.7μF ceramic bypass to PGND for stability. |
| SENSE (Pin 10) | Top MOSFET current sense input | Connects to SW node for RDS(ON) sensing or to sense resistor drain for higher accuracy. |
| VIN (Pin 11) | Main input supply | 4.5V–38V input rail; requires ≥1μF ceramic bypass to PGND near pin for high-frequency decoupling. |
| SW (Pin 12) | Switch node connection | Connects to source of top MOSFET; used for bottom current limit and reverse-current detection. |
| TG (Pin 13) | Top gate driver output | Floating driver powered by BOOST; drives top N-MOSFET gate with 2.5Ω pull-up/1.5Ω pull-down. |
| BOOST (Pin 14) | Top gate charge pump supply | Decoupled to SW via 0.1μF ceramic; forms floating supply for TG driver using external Schottky diode. |
| MODE/SYNC (Pin 15) | Operation mode select / sync input | Pull <1.2V for forced continuous mode; pull >1.2V for pulse-skipping; accepts external clock for synchronization. |
| RUN/SHDN (Pin 16) | Enable/shutdown control | 1.22V enable threshold; <0.74V forces shutdown with <14μA quiescent current; includes 1μA pull-up for default turn-on. |
| PGND (Exposed Pad) | Power ground return | Return path for BG driver and VIN/INTVCC bypass caps; electrically isolated from SGND; must be soldered to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Line feedforward compensation | Compensates modulator gain variation with input voltage, delivering constant loop gain and stable transient response across 4.5V–38V VIN. |
| Programmable cycle-by-cycle current limit | Independent top/bottom thresholds set via external resistors on ILIMT/ILIMB pins, enabling precise overcurrent protection without sense resistors. |
| Pre-biased output start-up support | Starts in pulse-skipping mode until SS reaches 0.54V, preventing reverse current flow into pre-charged VOUT rails during power sequencing. |
| Output overvoltage protection (OVP) | Dedicated MAX comparator disables TG and enables BG on >10% VOUT overshoot, protecting downstream loads without external components. |
| Thermally optimized MSOP package | Exposed PGND pad reduces θJA to 40°C/W, enabling reliable 15A operation in compact industrial and telecom PCB layouts. |
Applications
| Telecom Point-of-Load Regulation | Industrial 24V-to-12V Conversion |
|---|---|
Use Scenario: Regulating 1.2V/15A from 12V intermediate bus in 5G base station RF card power delivery. IC Role / Device Role / Timing Role: Voltage-mode synchronous buck controller managing dual N-MOSFET stage with 500kHz switching and RDS(ON) current sensing. Use Value: 30ns min on-time enables stable 10:1 step-down ratio; line feedforward ensures <50μs load transient recovery under 5A/μs slew rate. | Use Scenario: Converting 24V factory automation supply to 12V for PLC I/O modules with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency buck controller synchronized to system clock via MODE/SYNC pin to reduce conducted noise. Use Value: 250kHz–1MHz programmability allows EMI band avoidance; forced continuous mode eliminates low-frequency ripple in sensitive analog circuits. |
| Automotive Infotainment Core Supply | Test Equipment Precision Power |
Use Scenario: Generating 1.8V core voltage for automotive SoC in ADAS domain controller with 42V cold-crank tolerance. IC Role / Device Role / Timing Role: High-input-range buck controller operating from 4.5V–38V, using pulse-skipping mode for light-load efficiency. Use Value: Wide VIN range survives load-dump transients; ±0.75% reference accuracy maintains SoC timing margins across –40°C to 85°C. | Use Scenario: Providing ultra-stable 3.3V/10A output for automated test equipment ADC/DAC reference stages. IC Role / Device Role / Timing Role: Precision buck controller with Type 3 compensation network and 0.6V reference for <0.1% output drift. Use Value: 25MHz error amplifier GBW and 80dB open-loop gain enable tight phase margin control; soft-start prevents inrush-induced measurement errors. |
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 | Integrated MOSFETs (not controller-only); 4.5V–16V VIN; fixed 600kHz frequency; no RDS(ON) sensing. | Suitable for space-constrained, lower-power (<8A) designs where integration outweighs flexibility. | Select MP2918GQ-Z when board area is critical and input range is limited to ≤16V; LTC3775EMSE#PBF preferred for >16V inputs or discrete MOSFET optimization. |
| LTC3891EFE#PBF | Includes integrated 5V bias supply; wider 4.5V–60V VIN; 50ns min on-time; no ILIMB pin (single current limit). | Designed for high-voltage industrial systems requiring auxiliary bias generation and extended input range. | Choose LTC3891EFE#PBF for >38V inputs or when needing integrated INTVCC replacement; LTC3775EMSE#PBF offers finer current limit granularity and lower min on-time. |
Compared with MP2918GQ-Z and LTC3891EFE#PBF, the LTC3775EMSE#PBF provides superior flexibility in MOSFET selection, tighter reference accuracy (±0.75% vs ±1%), and lower minimum on-time (30ns vs 50ns), making it optimal for high-ratio, high-precision, wide-input applications where discrete power stage optimization is required.
Availability
LTC3775EMSE#PBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial 24V conversion systems, and automotive infotainment core supplies requiring stable component supply across extended temperature ranges.
Supply support for LTC3775EMSE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3775 belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for demanding synchronous buck applications requiring wide input range, fast transient response, and flexible current sensing in telecom, industrial, and automotive systems.
FAQ
What is the minimum on-time specification for the LTC3775EMSE#PBF and why does it matter?
The LTC3775EMSE#PBF has a guaranteed minimum on-time of less than 30ns. This enables high step-down ratios - for example, generating 1.2V from a 12V input at 500kHz (duty cycle = 10%) without pulse skipping or instability. In practice, this allows reliable operation in point-of-load applications where small inductors and high frequencies are needed to minimize solution size and improve transient response. The LTC3775EMSE#PBF achieves this through its leading-edge modulation architecture and fast gate drivers.
How does the LTC3775EMSE#PBF implement current limiting without a sense resistor?
The LTC3775EMSE#PBF supports RDS(ON) current sensing by connecting the SENSE pin directly to the switch node (SW), measuring voltage drop across the top MOSFET's on-resistance. Internal comparators monitor this signal against thresholds set by ILIMT (topside) and ILIMB (bottom side) pins, each with factory-trimmed current sources (100μA sink and 10μA source). This eliminates sense resistor losses and improves efficiency, especially at high currents. The LTC3775EMSE#PBF retains sense resistor option for higher accuracy when needed.
Can the LTC3775EMSE#PBF safely start up into a pre-biased output?
Yes. The LTC3775EMSE#PBF automatically starts in pulse-skipping mode until the SS pin voltage reaches 0.54V, regardless of MODE/SYNC pin state. During this phase, it avoids forcing current into a pre-charged VOUT rail, preventing reverse conduction through the bottom MOSFET. Once SS exceeds 0.54V, it transitions to the user-selected mode (pulse-skipping or forced continuous). This behavior is built into the LTC3775EMSE#PBF's start-up logic and requires no external circuitry.
What thermal considerations apply to the LTC3775EMSE#PBF in MSOP package?
The LTC3775EMSE#PBF in 16-lead MSOP (MSE) package has θJA = 40°C/W when the exposed PGND pad is properly soldered to a minimum 100mm² copper area on the PCB. Failure to connect the exposed pad significantly degrades thermal performance. For 15A operation at full load, junction temperature rise above ambient remains within safe limits (TJ < 125°C) with adequate copper pour and airflow. The LTC3775EMSE#PBF also includes thermal shutdown protection that disables outputs if TJ exceeds 165°C.
How is the switching frequency programmed on the LTC3775EMSE#PBF?
The LTC3775EMSE#PBF switching frequency is set by a resistor (RSET) connected from the FREQ pin to SGND. Typical values range from 24.9kΩ (1MHz) to 133kΩ (250kHz), with 39.2kΩ yielding ~500kHz. The oscillator can also be synchronized to an external clock applied to the MODE/SYNC pin, locking to frequencies within ±20% of the free-running value. This dual-mode capability allows EMI reduction via spread-spectrum or deterministic noise placement. All frequency settings apply directly to the LTC3775EMSE#PBF without additional configuration registers.
LTC3775EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3775EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3775EMSE#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 LTC3775EMSE#PBF reliable?
The price and inventory of LTC3775EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3775EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3775EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3775EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3775EMSE#PBF?
LTC3775EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3775EMSE#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 LTC3775EMSE#PBF?
For technical support, including LTC3775EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3775EMSE#PBF requirements.
6.How does Aetrix verify that LTC3775EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3775EMSE#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 LTC3775EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3775EMSE#PBF?
All LTC3775EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3775EMSE#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 LTC3775EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3775EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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