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Analog Devices Inc. LTC3854IMSE#TRPBF
- Part No.:
- LTC3854IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3854IMSE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,795
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Product details
Overview
LTC3854IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4.5V to 38V input, regulates output from 0.8V to 5.5V, features 400kHz fixed-frequency current-mode control, 75ns minimum on-time, and integrated 5V LDO for gate drive. Used in telecom power supplies requiring high step-down ratio and pre-biased start-up.
For engineers reviewing the LTC3854IMSE#TRPBF datasheet, LTC3854IMSE#TRPBF pinout, LTC3854IMSE#TRPBF application, or LTC3854IMSE#TRPBF equivalent, key selection criteria include RSENSE/DCR current sensing flexibility, OPTI-LOOP® compensation for wide output capacitance tolerance, output overvoltage protection, 97% duty cycle dropout operation, and thermal performance in the 12-lead MSOP package.
Technical Context
The LTC3854IMSE#TRPBF implements constant-frequency peak current-mode control with internal slope compensation that preserves maximum inductor peak current across all duty cycles. Its transconductance error amplifier (gm = 2.0 mmho, GBW = 3 MHz) interfaces with the ITH pin to set current comparator trip level, while FB pin compares 0.8V reference (±1% over temperature) against resistor-divider feedback.
It integrates dual N-channel MOSFET drivers with matched 2.5Ω TG pull-up / 2.1Ω BG pull-down on-resistance, 25ns rise/fall times, and 30ns cross-conduction delay control. The INTVCC 5V LDO (4.8–5.2V, ±1% load regulation) powers internal circuitry and external gate drivers, with shutdown IQ of 15µA and UVLO threshold of 3.5V (350mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 38V - supports wide industrial and telecom input rails without external regulators |
| Output Voltage Range | 0.8V to 5.5V - enables direct regulation of core voltages (e.g., 0.8V for FPGAs) and standard logic rails |
| Switching Frequency | 400kHz (±10%) - balances efficiency, size, and EMI; fixed frequency simplifies filter design |
| Reference Accuracy | ±1% at 0.8V over –40°C to 85°C - ensures tight output regulation under thermal stress |
| Min On-Time | 75ns - enables high step-down ratios (e.g., 36V→3.3V at 400kHz) without pulse-skipping |
| Duty Cycle Max | 97% - supports ultra-low dropout operation during brownout or low-VIN conditions |
| Shutdown IQ | 15µA - minimizes standby power loss in battery-backed or always-on systems |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.4mm), exposed pad (Pin 13) soldered to PCB ground for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Error amplifier inverting input | Connects to resistor divider; sets regulated output voltage via 0.8V internal reference |
| ITH (2) | Error amplifier output & compensation node | Controls peak current limit; interface for OPTI-LOOP® network to optimize transient response |
| RUN/SS (3) | Enable & soft-start control | Pull <0.4V for shutdown; internal 1.25µA current charges external capacitor for controlled VOUT ramp |
| BOOST (4) | Floating supply for top-gate driver | Connected to SW via ceramic capacitor; enables high-side N-MOSFET drive with bootstrapped voltage |
| TG (5) | Top N-MOSFET gate driver output | Drives high-side switch with 2.5Ω pull-up / 2.1Ω pull-down; supports >20A output with external FETs |
| SW (6) | Switch node connection | Connects to inductor and BOOST capacitor; voltage swings from GND to VIN during operation |
| GND (7) | Signal & power ground | Kelvin-connected internal ground; must be low-impedance plane for noise immunity and driver return path |
| BG (8) | Bottom N-MOSFET gate driver output | Drives synchronous rectifier; rail-to-rail swing (0V to 5V) with 25ns transition times |
| INTVCC (9) | Internal 5V LDO output | Powers control circuitry and drivers; requires ≥2.2µF X5R ceramic bypass to GND |
| VIN (10) | Main input supply | Accepts 4.5–38V; powers INTVCC LDO and provides current to external MOSFETs via drivers |
| SENSE– (11) | Current sense comparator negative input | High-impedance input (<1µA bias); used with SENSE+ for RSENSE or DCR-based current sensing |
| SENSE+ (12) | Current sense comparator positive input | Common-mode range 0–5.5V; enables accurate DCR sensing with external RC filter matching L/DCR time constant |
Key Features
| Feature | Design Value |
|---|---|
| RSENSE or DCR current sensing | Supports both discrete shunt resistors (max 50mV threshold) and lossless inductor DCR sensing with programmable RC filter |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitors (e.g., 10µF–1000µF) and ESR values without redesign |
| Output overvoltage protection | Hardware comparator triggers immediate top-FET turn-off and bottom-FET turn-on if FB exceeds 0.88V |
| Start-up into pre-biased output | Enables safe power sequencing in multi-rail systems where output already holds voltage before controller enable |
| Current foldback limiting | Reduces MOSFET dissipation during short-circuit by lowering peak current limit; disabled during soft-start to prevent latch-up |
Applications
| Telecom Power Supply | Industrial Motor Drive Control |
|---|---|
Use Scenario: 48V intermediate bus conversion to 5V/7A for base station RF modules with strict efficiency and thermal requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current power stage with DCR current sensing and 400kHz switching. Use Value: 97% peak efficiency at 12VIN/5VOUT, 97% duty cycle operation maintains regulation during 48V-to-3.3V conversion under brownout. | Use Scenario: Isolated 24V system powering microcontroller, gate drivers, and analog sensors in servo motor controllers. IC Role / Device Role / Timing Role: Non-isolated buck controller delivering tightly regulated 3.3V/2A from noisy 24V rail with ±1% reference accuracy. Use Value: OPTI-LOOP® compensation maintains stability despite wide variation in output capacitor aging and ESR drift over temperature. |
| Automotive ADAS Camera Module | Distributed DC Power System |
Use Scenario: Start-stop compatible 12V-to-1.2V conversion for image signal processor in rear-view camera with cold-crank tolerance. IC Role / Device Role / Timing Role: High-step-down ratio controller using 75ns min-on-time to sustain regulation down to 4.5V input during cranking. Use Value: Pre-biased start-up prevents reverse current flow into powered output rail during hot-plug events or system reset. | Use Scenario: 36V backplane powering multiple point-of-load converters in datacom shelf management unit. IC Role / Device Role / Timing Role: Wide-input buck controller regulating 12V distribution rail with RSENSE current monitoring for system-level fault logging. Use Value: 15µA shutdown IQ extends hold-up time during AC loss; RUN/SS pin enables coordinated power sequencing across multiple rails. |
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 |
|---|---|---|---|
| LTC3891EMSE#TRPBF | Includes integrated 5V/150mA bias supply and higher VIN max (60V); same 400kHz freq, 0.8V ref, MSOP-12 package | Eliminates need for external INTVCC LDO in high-VIN designs; supports wider input range but higher quiescent current (45µA) | Choose when input exceeds 38V or auxiliary 5V rail required; not drop-in due to different bias architecture |
| MP2918GL-Z | 400kHz fixed-frequency controller; 4.5–36V input; 0.6V ref; no integrated LDO - requires external 5V bias | Lacks INTVCC regulator and OPTI-LOOP®; uses standard Type II compensation; lower cost but reduced transient robustness | Choose for cost-sensitive applications with existing 5V bias rail and simpler compensation requirements |
Compared with LTC3854IMSE#TRPBF, LTC3891EMSE#TRPBF adds high-VIN capability and integrated bias supply at the expense of higher shutdown current, while MP2918GL-Z reduces BOM count by omitting the LDO but requires external compensation tuning and lacks pre-biased start-up support.
Availability
LTC3854IMSE#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor drive control, automotive ADAS camera modules, and distributed DC power systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3854IMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3854IMSE#TRPBF belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for wide-input industrial and telecom power conversion where reliability, thermal performance, and flexible current sensing are critical.
FAQ
What is the absolute maximum input voltage rating for the LTC3854IMSE#TRPBF?
The LTC3854IMSE#TRPBF has an absolute maximum input voltage (VIN) rating of 40V, as specified in the Absolute Maximum Ratings table. Operation above 38V is not recommended for continuous use, and the device is rated for reliable operation from 4.5V to 38V. Exceeding 40V may cause permanent damage.
Does the LTC3854IMSE#TRPBF support start-up into a pre-biased output?
Yes, the LTC3854IMSE#TRPBF supports start-up into a pre-biased output. This feature prevents reverse current flow when the output voltage is already present before the controller enables, which is essential for safe power sequencing in multi-rail systems. The device achieves this through controlled gate drive timing and internal circuitry that monitors the SW node state during enable.
What current sensing methods does the LTC3854IMSE#TRPBF support?
The LTC3854IMSE#TRPBF supports both RSENSE (discrete shunt resistor) and DCR (inductor winding resistance) current sensing. It accepts up to 50mV differential sense voltage and includes high-impedance SENSE+ and SENSE– inputs with 0–5.5V common-mode range, enabling accurate DCR sensing when paired with an external RC filter matched to the L/DCR time constant.
How does OPTI-LOOP® compensation benefit designs using the LTC3854IMSE#TRPBF?
OPTI-LOOP® compensation in the LTC3854IMSE#TRPBF allows the control loop to remain stable across a wide range of output capacitance values (e.g., 10µF to 1000µF) and ESR variations without requiring compensation network changes. This simplifies design reuse, accommodates capacitor aging and temperature drift, and improves transient response robustness in production environments.
What is the purpose of the INTVCC pin on the LTC3854IMSE#TRPBF?
INTVCC is the output of the internal 5V low-dropout linear regulator that powers the LTC3854IMSE#TRPBF's gate drivers and internal circuitry. It delivers up to 40mA peak current and must be bypassed with ≥2.2µF low-ESR ceramic capacitor to handle high transient gate-charge demands. The LDO is powered from VIN and regulates to 4.8–5.2V over load and temperature.
LTC3854IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (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:
- 400kHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3854IMSE#TRPBF FAQ
1.How can I place an order for LTC3854IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3854IMSE#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 LTC3854IMSE#TRPBF reliable?
The price and inventory of LTC3854IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3854IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3854IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3854IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3854IMSE#TRPBF?
LTC3854IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3854IMSE#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 LTC3854IMSE#TRPBF?
For technical support, including LTC3854IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3854IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3854IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3854IMSE#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 LTC3854IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3854IMSE#TRPBF?
All LTC3854IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3854IMSE#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 LTC3854IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3854IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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