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Analog Devices Inc. LT3697IMSE#TRPBF
- Part No.:
- LT3697IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3697IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.5A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
LT3697IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 35V input, 2.5A synchronous step-down DC/DC converter optimized for USB 5V power delivery with programmable cable drop compensation and accurate output current limiting. It regulates USB5V to 4.99V ±10mV over line/load/temperature, supports up to 60V input transients, and delivers regulated 5V at the remote USB socket across up to 4m AWG20 twisted-pair cable. Its dual feedback architecture enables regulation at either USB5V or SYS pin, and it integrates an active 180mA load to suppress output overshoot during load transients.
For engineers reviewing the LT3697IMSE#TRPBF datasheet, LT3697IMSE#TRPBF pinout, LT3697IMSE#TRPBF application, or LT3697IMSE#TRPBF equivalent, key selection criteria include its 300kHz–2.2MHz adjustable switching frequency, 1.5ms FLT fault blanking for hot-plug immunity, 6.1V maximum SYS clamp for USB switch protection, and precise 0.5% current limit threshold tolerance - all critical for automotive and industrial USB host designs requiring robust cable-compensated 5V rails.
Technical Context
The LT3697IMSE#TRPBF employs a constant-frequency current-mode control architecture with three independent feedback paths: USB5V (primary 5V regulation), SYS (6.1V overvoltage clamp and auxiliary supply), and ISP/ISN (differential current sense for programmable 2.5A limit). Its oscillator uses an external RT resistor to set frequency from 300kHz to 2.2MHz, with foldback below 240kHz under low SYS voltage to manage startup and overload conditions.
It implements cable drop compensation by sourcing current from USB5V through RCDC into RCBL, generating a load-current-proportional offset that raises VOUT to maintain 5V at the remote load. The RCBL pin also serves as a current monitor output, while FLT provides open-drain overcurrent fault indication with 1.5ms deglitching - ensuring reliable detection of sustained >99.5% current limit violations without false triggering on transient spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 35V continuous; withstands 60V nonrepetitive transients - enables direct connection to automotive battery rails with minimal front-end protection. |
| Output Current | 2.5A maximum continuous - sufficient to power USB-C PD sink devices or multi-port USB hubs without external switches. |
| USB5V Regulation Accuracy | 4.95V to 5.03V at TA = 25°C - ensures compliance with USB 2.0/3.0 VBUS specification (4.75V–5.25V) even under full load and temperature extremes. |
| Cable Drop Compensation Range | Adjustable up to 1.1V offset (5.0V → 6.1V) - compensates for ≥0.26Ω cable resistance (e.g., 4m AWG20) while maintaining 5V at load. |
| Current Limit Accuracy | ±2% typical error at 2.5A - eliminates need for external USB power switches and enables precise system-level current budgeting. |
| Switching Frequency | 300kHz to 2.2MHz via RT resistor - allows optimization for EMI (lower freq) or small magnetics (higher freq) in space-constrained layouts. |
| Active Load Current | 120mA to 240mA sourced from SYS pin - actively sinks current during load steps to reduce output overshoot by up to 300mV in typical 4m cable applications. |
| FLT Fault Response | 1.5ms minimum assertion time before pull-down - filters hot-plug events and prevents nuisance tripping during normal USB device insertion. |
Pinout & Package
The LT3697IMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17), requiring soldering to PCB ground plane for θJA = 40°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2) | Main power input | Supplies internal regulator and NPN switch; must be locally bypassed with ≥10µF ceramic capacitor to handle 60V transients. |
| EN (3) | Enable control | Logic-high (>2.5V) enables regulation; logic-low (<0.3V) reduces quiescent current to <1µA for system sleep modes. |
| FLT (4) | Fault indicator | Open-drain output pulled low for >1.5ms after sustained overcurrent; valid only when VIN > 4V and EN high. |
| SYNC (5) | External clock input | Accepts 300kHz–2.2MHz square wave to synchronize switching and reduce EMI in multi-regulator systems. |
| RT (6) | Oscillator timing | Connects to ground via resistor (e.g., 255kΩ for 500kHz); sets frequency and enables foldback during dropout. |
| VC (7) | Error amplifier output | Controls peak switch current; requires R-C compensation network to stabilize loop with cable-compensated feedback. |
| RLIM (8) | Current limit reference | 11µA internal pull-up sets 2.5A limit with 29.4kΩ to GND; floating disables current limiting. |
| RCBL (9) | Cable compensation monitor | Sources current proportional to load; ties to GND via resistor (e.g., 16.5kΩ) to program 1.1V max compensation. |
| ISN (10) | Inverting current sense | Connects to low side of RSENSE (e.g., 22mΩ); forms differential pair with ISP to measure output current. |
| ISP (11) | Noninverting current sense | Connects to high side of RSENSE or to USB switch output - enables current sensing downstream of switch. |
| USB5V (12) | Primary feedback | Regulated to 4.99V; connects to local output or USB switch output via RCDC to enable cable compensation. |
| SYS (13) | Auxiliary feedback & supply | Regulated to 6.1V when USB switch opens; powers internal circuitry and supplies 180mA active load to suppress overshoot. |
| BST (14) | Bootstrap drive | Charges external capacitor to ~VIN + 4.5V to fully saturate internal NPN switch; requires 100nF X7R ceramic. |
| SW (15,16) | Power switch output | Drives external inductor and catch diode; pins 15/16 paralleled for low-inductance high-current path. |
| GND (17) | Ground reference | Exposed pad must be soldered to PCB ground plane - essential for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual feedback regulation | Simultaneously regulates USB5V (5V) and SYS (6.1V) - enables safe operation with series USB power switches and protects against overvoltage faults. |
| Programmable cable drop compensation | Adjusts VOUT up to 6.1V using RCBL/RCDC ratio - maintains 5V at remote USB socket without Kelvin sensing wires. |
| Accurate 2.5A current limit | ±2% tolerance at full scale - replaces discrete USB power switches and simplifies BOM for automotive infotainment head units. |
| 180mA active load on SYS | Reduces output voltage overshoot by >200mV during 2.5A load steps - critical for stable USB charging in vehicles with long harnesses. |
| 1.5ms FLT deglitching | Filters hot-plug transients while detecting sustained overcurrent - prevents false shutdowns during normal USB device enumeration. |
| 60V input transient tolerance | Survives ISO 7637-2 Pulse 1/2/5a without external TVS - reduces need for costly front-end protection in 12V/24V automotive systems. |
Applications
| Automotive USB Charging Port | Industrial USB Hub Controller Supply |
|---|---|
Use Scenario: Powering USB-A/C ports in vehicle center consoles with 4m wiring harnesses to rear-seat outlets. IC Role / Device Role / Timing Role: Primary 5V buck regulator with cable drop compensation and current limiting - maintains 5V ±50mV at USB socket despite 0.26Ω cable resistance. Use Value: Eliminates need for remote sense lines or secondary regulators, reducing harness cost and improving reliability in vibration-prone environments. | Use Scenario: Providing stable 5V to USB 3.0 hub controllers in factory automation gateways with long backplane traces. IC Role / Device Role / Timing Role: Local 5V supply with dual feedback - regulates at hub controller input (SYS) when upstream switch opens, preventing overvoltage damage. Use Value: Enables hot-swap capable USB infrastructure with automatic fault isolation and no manual reset required after overcurrent events. |
| USB-Powered Test Equipment | Ruggedized Tablet Docking Station |
Use Scenario: Benchtop USB instruments requiring precise 5V rail for ADC references and digital logic, powered from lab bench supply. IC Role / Device Role / Timing Role: High-accuracy 5V regulator with 10mV line/load regulation - ensures measurement integrity across 6V–35V input range. Use Value: Maintains USB compliance under varying input conditions, enabling consistent data acquisition without recalibration. | Use Scenario: Docking station for field tablets with integrated USB peripherals, subjected to wide ambient temperatures (−40°C to 85°C). IC Role / Device Role / Timing Role: Robust 5V supply with −40°C to 125°C junction rating and 1.5ms FLT blanking - survives thermal cycling and repeated hot-plug events. Use Value: Guarantees uninterrupted USB peripheral operation in outdoor deployments where condensation and rapid temperature shifts occur. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB 5V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3–17V input, 3A output, no cable drop compensation, no dual feedback, 1.2V fixed FB reference requiring external divider for 5V. | Lacks remote sensing and USB-specific protection features; suitable only for short-cable, fixed-input applications. | Select only if input is tightly regulated ≤17V and cable length <10cm; requires additional circuitry for USB compliance. |
| MP2451DT-LF-Z | 4.75–28V input, 2A output, no current limit programming, no FLT flag, no SYS pin or active load. | Basic buck only; cannot regulate at USB socket or protect downstream switches during fault conditions. | Use only for non-USB, low-cost 5V supplies where cable drop and overcurrent protection are handled externally. |
Compared with TPS62130ARGTR and MP2451DT-LF-Z, the LT3697IMSE#TRPBF uniquely integrates cable drop compensation, dual feedback for USB switch compatibility, and a dedicated FLT fault flag - making it the only single-chip solution for automotive-grade USB 5V delivery over extended cables without external components.
Availability
LT3697IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive USB charging ports, industrial USB hub controllers, and ruggedized docking stations requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for LT3697IMSE#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 its legacy of high-performance analog ICs for demanding power and signal conditioning applications.
The LT3697IMSE#TRPBF belongs to Linear's USB-optimized power management portfolio, designed specifically for automotive and industrial systems requiring robust 5V USB power delivery over long cables with integrated protection and compensation.
FAQ
What is the maximum cable resistance the LT3697IMSE#TRPBF can compensate for while maintaining 5V at the load?
The LT3697IMSE#TRPBF limits maximum VOUT to 6.1V via the SYS pin clamp. With a nominal 5V USB5V regulation and 2.5A full load, it can compensate for up to 0.44Ω cable resistance (6.1V − 5.0V)/2.5A. In practice, with RSENSE = 22mΩ and RCBL = 16.5kΩ, the datasheet confirms stable 5V regulation across 4m AWG20 cable (0.26Ω). Exceeding this requires verifying loop stability with CCDC adjustment.
How does the LT3697IMSE#TRPBF protect USB devices if the cable compensation overdrives the output?
The LT3697IMSE#TRPBF protects USB devices by clamping the SYS pin voltage to 6.1V maximum. When cable drop compensation would raise VOUT above this threshold - such as during high-current loads with excessive RCBL/RCDC ratios - the error amplifier saturates and VOUT stops rising. This hard limit prevents USB5V from exceeding 6.1V at the regulator output, safeguarding downstream USB switches and connected devices from overvoltage stress.
Can the LT3697IMSE#TRPBF operate without a USB switch in the output path?
Yes, the LT3697IMSE#TRPBF operates without a USB switch. In direct-connect mode, tie USB5V directly to the output capacitor and float the ISP/ISN pins. The SYS pin then functions solely as the auxiliary 5V supply source and active load node. Dual feedback remains inactive, and cable compensation is implemented solely via USB5V–RCDC–RCBL. All core regulation, current limiting, and fault reporting functions remain fully operational.
What is the purpose of the 180mA active load on the SYS pin of the LT3697IMSE#TRPBF?
The 180mA active load on the SYS pin of the LT3697IMSE#TRPBF sinks current from the output during fast load increases (e.g., USB device plug-in), counteracting inductive energy stored in the cable and reducing output voltage overshoot by up to 300mV. It activates when USB5V rises 1.5% above 5V or when BST drive voltage is insufficient, ensuring transient response remains stable across temperature and input voltage variations without requiring external components.
Does the LT3697IMSE#TRPBF require external compensation components, and if so, where are they placed?
Yes, the LT3697IMSE#TRPBF requires external compensation on the VC pin: a series RC network (e.g., 10kΩ + 1nF) from VC to GND stabilizes the control loop, especially with cable drop compensation. Additionally, CCDC (10nF) across RCDC (10kΩ) is mandatory to dampen high-frequency gain introduced by cable compensation. Omitting either causes instability - confirmed by oscillation in load transient tests per Figure 3697 G30/G31 in the datasheet.
LT3697IMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- 6.1V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3697IMSE#TRPBF FAQ
1.How can I place an order for LT3697IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3697IMSE#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 LT3697IMSE#TRPBF reliable?
The price and inventory of LT3697IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3697IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3697IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3697IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3697IMSE#TRPBF?
LT3697IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3697IMSE#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 LT3697IMSE#TRPBF?
For technical support, including LT3697IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3697IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3697IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3697IMSE#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 LT3697IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3697IMSE#TRPBF?
All LT3697IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3697IMSE#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 LT3697IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3697IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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