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Analog Devices Inc. LTC3775IMSE#TRPBF
- Part No.:
- LTC3775IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3775IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,662
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Product details
Overview
LTC3775IMSE#TRPBF 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 delivers precise 0.6V reference accuracy (±0.75%), supports 250kHz–1MHz programmable switching frequency, achieves <30ns minimum on-time for high step-down ratios, and features RDS(ON) or sense-resistor current sensing. It is used in telecom power supplies requiring fast transient response and stable 1.2V/15A output rails.
For engineers reviewing the LTC3775IMSE#TRPBF datasheet, LTC3775IMSE#TRPBF pinout, LTC3775IMSE#TRPBF application, or LTC3775IMSE#TRPBF equivalent, key selection criteria include its 16-lead MSOP package with exposed PGND pad, cycle-by-cycle peak current limit configuration via ILIMT/ILIMB pins, line feedforward compensation for wide VIN stability, and forced continuous or pulse-skipping mode selection via MODE/SYNC.
Technical Context
The LTC3775IMSE#TRPBF implements leading-edge modulation voltage-mode control with a patented line feedforward circuit that maintains constant modulator gain across 4.5V–38V input, enabling stable loop behavior without recompensation. Its error amplifier provides 25MHz unity-gain bandwidth and ±0.75% reference accuracy over temperature, supporting tight output regulation under dynamic load steps.
It integrates dual high-current gate drivers (TG/BG) with 1.5Ω/1.0Ω pull-down and 2.5Ω/2.5Ω pull-up on-resistances, enabling direct drive of low-Qg N-channel MOSFETs. Cycle-by-cycle current limiting is implemented via external resistors on ILIMT (100μA sink) and ILIMB (10μA source), allowing independent top/bottom current threshold programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 38V - supports industrial and telecom input rails including 12V, 24V, and 28V systems without pre-regulation. |
| Reference Voltage | 0.6V ±0.75% - enables accurate output setting down to 0.6V with minimal drift over –40°C to 125°C. |
| Switching Frequency | 250kHz to 1MHz - user-programmable via FREQ pin resistor; allows optimization of inductor size, efficiency, and EMI profile. |
| tON(MIN) | <30ns - enables ultra-low duty cycles (e.g., 1.2V out from 24V in = 5%) without pulse skipping, critical for high-ratio buck conversion. |
| Current Sensing | RDS(ON) or sense resistor - eliminates current-sense resistor losses or provides higher accuracy via external RSENSE. |
| Shutdown Current | 14μA typical - ensures ultra-low system standby power in battery-backed or energy-sensitive applications. |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
The LTC3775IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with an exposed PGND pad (Pin 17) that must be soldered to the PCB for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIMT (Pin 1) | Top MOSFET current limit set point | 100μA internal sink current; sets VIN–SENSE threshold via external R to VIN - configures peak inductor current during TG conduction. |
| ILIMB (Pin 2) | Bottom MOSFET current limit set point | 10μA internal source current; sets PGND–SW threshold via external R to SGND - enables reverse-current detection and bottom-switch current limiting. |
| FB (Pin 3) | Error amplifier inverting input | Connects to VOUT divider; referenced to 0.6V internal precision bandgap - forms virtual ground for Type 3 compensation network at COMP. |
| COMP (Pin 4) | Error amplifier output | Drives line feedforward multiplier and PWM comparator; requires RC network to FB for loop stability - determines transient response and phase margin. |
| SS (Pin 5) | Soft-start ramp control | 1μA internal current source charges external CSS capacitor; regulates VFB to SS voltage during startup - prevents inrush current and output overshoot. |
| FREQ (Pin 6) | Oscillator frequency set | Resistor to SGND programs free-running frequency from 250kHz to 1MHz - balances efficiency, component size, and EMI compliance. |
| SGND (Pin 7) | Signal ground reference | Kelvin return for FB, SS, COMP, MODE/SYNC, RUN/SHDN - isolates noise-sensitive analog circuitry from power ground paths. |
| BG (Pin 8) | Bottom gate driver output | Drives bottom N-MOSFET gate from PGND to INTVCC (5.2V); 1.0Ω pull-down ensures fast turn-off - minimizes shoot-through risk in synchronous rectification. |
| INTVCC (Pin 9) | Internal 5.2V LDO output | Powers gate drivers and control logic; requires ≥4.7μF ceramic bypass to PGND - sustains operation even if VIN dips below 5.2V during transients. |
| SENSE (Pin 10) | Top MOSFET current sense input | Connects to SW node for RDS(ON) sensing or to sense resistor drain - enables lossless current monitoring without added component cost. |
| VIN (Pin 11) | Main input supply | 4.5V–38V input rail; requires ≥1μF ceramic bypass to PGND - powers internal circuits and supplies BOOST charge pump via internal regulator. |
| SW (Pin 12) | Switch node connection | Connects to source of top MOSFET; feeds bottom current limit comparator and zero-crossing detector - defines switching waveform and reverse-current timing. |
| TG (Pin 13) | Top gate driver output | Floating driver powered by BOOST; swings from SW to BOOST - enables high-side N-MOSFET drive without external bootstrap components. |
| BOOST (Pin 14) | Top gate driver supply | Decoupled to SW via 0.1μF ceramic; charged by Schottky diode from INTVCC - generates floating supply for TG driver during high-side conduction. |
| 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 up to ±20% of fOSC - enables EMI reduction or system-level clock synchronization. |
| RUN/SHDN (Pin 16) | Enable/shutdown control | 1.22V enable threshold; 0.74V shutdown threshold with 140mV hysteresis - supports precise UVLO implementation using external resistor divider on VIN. |
| PGND (Exposed Pad) | Power ground return | Electrically isolated from SGND; connects to bottom MOSFET source and VIN/INTVCC bypass caps - mandatory soldering required for thermal performance (θJC = 4.2°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Line feedforward compensation | Maintains constant loop gain across 4.5V–38V input range, eliminating need for re-tuning compensation when VIN varies - critical for telecom rectifier and battery-input systems. |
| Programmable current limit | Independent top/bottom thresholds via ILIMT (100μA sink) and ILIMB (10μA source) pins - enables asymmetric current limiting for optimized efficiency and fault protection. |
| Low 30ns minimum on-time | Supports 1.2V output from 24V input (5% duty cycle) without pulse skipping - enables single-stage conversion where traditional controllers require cascaded stages. |
| Thermally enhanced MSOP | 16-lead MSOP with exposed PGND pad and θJA = 40°C/W - delivers higher power density than standard SOIC while maintaining manufacturability in automated SMT lines. |
| Leading-edge voltage-mode control | Direct COMP-to-duty-cycle mapping with fast error amplifier (25MHz GBW) - achieves sub-10μs load transient recovery in 1.2V/15A point-of-load designs. |
Applications
| Telecom Power Supply | Industrial PLC Power Rail |
|---|---|
Use Scenario: Generating stable 1.2V/15A core voltage for FPGA or ASIC in 48V-powered telecom shelf systems with strict hold-up time requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing all-N-channel MOSFET stage; regulates output using 0.6V reference and line feedforward for input ripple rejection. Use Value: Achieves >90% efficiency at full load with 500kHz switching, minimizing heat sink size while meeting EN55022 Class B conducted EMI limits through programmable frequency and pulse-skipping mode. | Use Scenario: Providing isolated 3.3V/5A auxiliary rail from 24V DC bus in programmable logic controller backplane with wide ambient temperature variation (–40°C to +70°C). IC Role / Device Role / Timing Role: High-reliability step-down controller operating in forced continuous mode to avoid audible noise; uses RDS(ON) sensing to eliminate sense resistor failure points. Use Value: Delivers ±1% output regulation over line/load/temperature with 125°C junction rating, ensuring uptime in uncooled industrial enclosures. |
| Automotive ADAS Domain Controller | Server Point-of-Load Converter |
Use Scenario: Powering image signal processor (ISP) in 12V automotive camera module requiring clean 1.1V supply with fast load step response (<5μs). IC Role / Device Role / Timing Role: Voltage-mode controller with 25MHz error amplifier and low-noise COMP pin; configured for 1MHz switching to shrink filter size in space-constrained housing. Use Value: Meets AEC-Q100 Grade 1 (–40°C to +125°C) qualification; soft-start and overvoltage protection prevent ISP latch-up during cold-crank events. | Use Scenario: Delivering 0.85V/60A CPU core power in AI accelerator card with multi-phase architecture where each phase uses discrete controller for redundancy. IC Role / Device Role / Timing Role: Single-phase synchronous buck controller synchronized to master clock via MODE/SYNC pin; uses sense-resistor current sensing for precise current sharing. Use Value: Enables phase interleaving with <30ns timing skew; 30ns tON(MIN) supports 0.85V output from 12V input (7% duty cycle) without compromising regulation. |
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 |
|---|---|---|---|
| MP2918GL-Z | Integrated MOSFETs (40V/12A), fixed 500kHz fSW, no RDS(ON) sensing, lower IQ (12μA) | Lower BOM count but limited to ≤12A; lacks programmable frequency and line feedforward | Select for compact, medium-current designs where layout area is constrained and input range is ≤28V. |
| ISL81601FRZ-T7A | Current-mode control, 4.5V–60V input, 1MHz max fSW, integrated drivers, no ILIMT/ILIMB pins | Superior light-load efficiency in DCM; lacks independent top/bottom current limit configuration | Select for wide-input (≤60V) applications needing robust current-mode stability and higher VIN headroom. |
Compared with MP2918GL-Z and ISL81601FRZ-T7A, the LTC3775IMSE#TRPBF offers unique line feedforward compensation for wide-VIN stability, independent top/bottom current limit programming, and <30ns minimum on-time for ultra-high step-down ratios - making it preferred for telecom and FPGA power where precision and flexibility outweigh integration benefits.
Availability
LTC3775IMSE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial PLC power rails, and automotive ADAS domain controllers requiring stable component supply with guaranteed long-term availability and extended temperature support.
Supply support for LTC3775IMSE#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 and maintains full product support, documentation, and manufacturing continuity for all Linear power management ICs.
The LTC3775IMSE#TRPBF belongs to Linear's high-performance DC/DC controller family designed for demanding industrial, telecom, and automotive applications requiring wide input range, fast transient response, and flexible current sensing.
FAQ
What is the minimum recommended input voltage for reliable operation of the LTC3775IMSE#TRPBF?
The LTC3775IMSE#TRPBF specifies a minimum input voltage of 4.5V across its full operating temperature range (–40°C to +125°C). Below this, the INTVCC LDO may drop out, causing gate driver undervoltage and potential malfunction. The absolute maximum rating allows –0.3V, but functional operation begins at 4.5V per Electrical Characteristics table.
How does the LTC3775IMSE#TRPBF implement current limiting with RDS(ON) sensing?
The LTC3775IMSE#TRPBF monitors the voltage across the top MOSFET's RDS(ON) by connecting the SENSE pin directly to the switch node (SW). When the voltage between VIN and SENSE exceeds the ILIMT threshold (set by external resistor to VIN), the controller reduces duty cycle to limit peak inductor current - eliminating the need for a separate sense resistor and associated power loss.
Can the LTC3775IMSE#TRPBF be synchronized to an external clock, and what is the acceptable frequency deviation?
Yes, the LTC3775IMSE#TRPBF can be synchronized to an external clock applied to the MODE/SYNC pin. The device locks to an external clock within ±20% of its free-running frequency (e.g., if programmed for 500kHz, sync range is 400kHz–600kHz), enabling EMI reduction through frequency dithering or system-level clock alignment.
What is the purpose of the exposed pad (Pin 17) on the LTC3775IMSE#TRPBF MSOP package?
The exposed pad (Pin 17) on the LTC3775IMSE#TRPBF is electrically connected to PGND and serves as the primary thermal and power ground path. It must be soldered to a large PCB copper pour to achieve the specified θJA = 40°C/W; failure to do so increases thermal resistance significantly and risks junction overheating under full load.
Does the LTC3775IMSE#TRPBF support pre-biased output startup, and how is it managed?
Yes, the LTC3775IMSE#TRPBF supports pre-biased output startup. During power-up, it defaults to pulse-skipping mode until the SS pin reaches 0.54V, allowing VOUT to remain at its pre-biased level. Once SS exceeds 0.54V, the controller transitions to the selected mode (continuous or pulse-skipping) and tracks the SS ramp - preventing reverse current flow into a pre-charged output capacitor.
LTC3775IMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3775IMSE#TRPBF FAQ
1.How can I place an order for LTC3775IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3775IMSE#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 LTC3775IMSE#TRPBF reliable?
The price and inventory of LTC3775IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3775IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3775IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3775IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3775IMSE#TRPBF?
LTC3775IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3775IMSE#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 LTC3775IMSE#TRPBF?
For technical support, including LTC3775IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3775IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3775IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3775IMSE#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 LTC3775IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3775IMSE#TRPBF?
All LTC3775IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3775IMSE#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 LTC3775IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3775IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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