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Analog Devices Inc. LT8697IUDD#TRPBF
- Part No.:
- LT8697IUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT8697IUDD#TRPBF.pdf
- Description:
- IC REG CONV USB 1OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
LT8697IUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 2 MHz synchronous step-down DC/DC converter optimized for 5 V USB power delivery with cable drop compensation. It delivers up to 2.5 A output current, maintains ±1.3% output accuracy over temperature, and features programmable current limit, dual feedback for USB switch integration, and forced continuous mode for fast transient response in automotive and industrial USB host applications.
For engineers reviewing the LT8697IUDD#TRPBF datasheet, LT8697IUDD#TRPBF pinout, LT8697IUDD#TRPBF application, or LT8697IUDD#TRPBF equivalent, key selection criteria include its 5 V ±1.3% regulation accuracy, 450 mV dropout at 2.1 A, 45 ns minimum on-time, 3 mm × 5 mm 24-lead QFN package with exposed pad, and integrated cable drop compensation supporting up to 3 m AWG20 cable.
Technical Context
The LT8697IUDD#TRPBF employs constant-frequency current-mode control with an externally adjustable oscillator (300 kHz–2.2 MHz via RT resistor). Its dual feedback architecture allows regulation either directly at USB5V or at the output of an external USB switch via SYS pin, while limiting maximum output to 5.8 V for fault protection.
Cable drop compensation is implemented by sourcing current from USB5V through RCDC, proportional to load current sensed across RSENSE, and mirrored via RCBL to raise local VOUT-enabling precise 5 V regulation at the remote load without Kelvin sensing. Forced continuous mode ensures negative inductor current capability and sub-100 µs load-step recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6 V to 42 V - supports wide automotive battery transients and industrial input rails. |
| Output Voltage Accuracy | ±1.3% over –40°C to +125°C - ensures stable USB 5 V compliance under thermal stress. |
| Max Output Current | 2.5 A - sufficient for USB BC1.2 charging and USB PD sink negotiation pre-stage. |
| Switching Frequency | Adjustable 300 kHz to 2.2 MHz - enables EMI optimization and compact magnetics design. |
| Min On-Time | 45 ns - supports high VIN-to-VOUT conversion ratios (e.g., 42 V → 5 V) without pulse-skipping. |
| Dropout Voltage | 450 mV at 2.1 A - maintains regulation during cold-crank conditions down to 5.45 V input. |
| Efficiency | 93% @ 2.1 A, 5 VOUT from 12 VIN - reduces thermal load in space-constrained USB hubs and docking stations. |
Pinout & Package
LT8697IUDD#TRPBF is housed in a thermally enhanced 24-lead 3 mm × 5 mm plastic QFN package (UDD) with exposed pad (Pin 25), requiring soldering to PCB ground plane for θJC = 5°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UV (4) | Enable / Input Undervoltage Lockout | Hysteretic enable threshold (0.94–1.06 V) allows programmable VIN shutdown; internal pull-up enables default-on operation. |
| PG (19) | Power Good Open-Drain Output | Indicates USB5V within ±9% of target; 40 µs delay ensures stable regulation before system boot. |
| USB5V (20) | Main Output Voltage Sense & Cable Compensation Input | Serves as regulated 5 V reference point; draws programmable current (up to 62.5 µA) for cable drop offset generation. |
| ISP / ISN (21, 22) | Differential Current Sense Inputs | Monitor output current via external sense resistor (e.g., 20 mΩ); enable accurate 2.1 A current limit with ±5% tolerance. |
| RCBL (23) | Cable Drop Compensation Programming | Sets compensation gain via resistor to GND; determines VOUT boost slope (e.g., 13.7 kΩ for 0.3 Ω cable). |
| ICTRL (24) | Current Limit Threshold Adjustment | Modulates VISP–VISN trip point from 4.5 mV to 51 mV; enables fine-tuned current limiting without changing RSENSE. |
| GND (25) | Exposed Thermal Pad | Must be soldered to PCB ground plane; primary thermal path for power dissipation management. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Cable Drop Compensation | Enables precise 5 V regulation at end-of-cable (e.g., 3 m AWG20) without Kelvin wiring-reducing BOM count and layout complexity. |
| Forced Continuous Mode (FCM) | Guarantees full switching frequency operation and negative inductor current capability, achieving <100 µs 0→2 A load-step recovery. |
| Dual Feedback Architecture | Allows regulation at USB switch output (via SYS pin) while clamping max VOUT to 5.8 V-protecting downstream USB devices during overcurrent faults. |
| Accurate Programmable Current Limit | ±5% current limit accuracy with 2.1 A nominal setting; supports latch-off or auto-retry via PG and TR/SS pins-eliminating need for external USB switch IC. |
| Ultra-Fast Minimum On-Time | 45 ns minimum on-time enables high step-down ratios (e.g., 42 V → 5 V at 2 MHz) without requiring lower switching frequencies or larger inductors. |
Applications
| Automotive USB Charging Hub | Industrial USB Host Controller |
|---|---|
Use Scenario: Powering multiple USB peripherals in vehicle infotainment systems with 3 m cable runs to rear-seat ports. IC Role / Device Role: Primary 5 V buck regulator with active cable compensation and fault-safe 5.8 V output clamp. Use Value: Maintains 4.925–5.075 V at load under 2.1 A, eliminating voltage droop-induced disconnects during hot-plug events. |
Use Scenario: Providing stable 5 V power to USB-connected PLC modules in factory automation cabinets. IC Role / Device Role: High-reliability USB supply with programmable current limit and PG monitoring for system-level fault logging. Use Value: ±1.3% output accuracy and thermal shutdown ensure uninterrupted operation in 70°C ambient environments. |
| Precision 5 V Test Equipment Supply | USB-C Docking Station Power Stage |
Use Scenario: Generating calibrated 5 V reference for benchtop instrumentation with minimal line/load regulation error. IC Role / Device Role: Low-noise, high-accuracy buck converter with dual feedback enabling direct regulation at measurement point. Use Value: 6 mV line regulation (6–42 V input) and 25 mV load regulation support sub-0.1% measurement uncertainty. |
Use Scenario: Delivering 5 V bus power in multi-port USB-C docks with integrated USB switches and ESD protection. IC Role / Device Role: Regulator co-located with USB switch; uses SYS pin feedback to regulate post-switch output while limiting max voltage to 5.8 V. Use Value: Eliminates need for separate overvoltage protection IC and simplifies layout by integrating cable compensation and current monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5 V USB buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRPBF | Lower 2 A max output, no cable drop compensation, fixed 5 V output, smaller 3 mm × 4 mm package. | Lacks RCBL/ISP/ISN pins; unsuitable for long-cable or USB switch-integrated designs. | Select when board space is critical and cable length ≤ 0.5 m; requires external current limiting. |
| TPS54561RGTT | 5.5 V to 60 V input, 5 A output, no integrated cable compensation, requires external current sense amplifier. | Supports higher input voltage but adds 3–4 passive components for current monitoring and compensation. | Choose for >42 V input or >2.5 A loads; expect longer design cycle due to external loop compensation. |
Compared with LT8697IUDD#TRPBF, LT8609SIV#TRPBF saves board area but forfeits cable compensation and programmable current limit, while TPS54561RGTT extends input range and output current at the cost of increased component count and design complexity for USB-specific features.
Availability
LT8697IUDD#TRPBF is available at Aetrix Electronics and suitable for automotive USB charging hubs, industrial USB host controllers, and precision 5 V test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8697IUDD#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 high-performance power management portfolio, emphasizing robustness, precision, and integration for demanding analog applications.
The LT8697IUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for USB-compliant 5 V power delivery with intelligent cable compensation and system-level fault management in automotive and industrial settings.
FAQ
What is the operating junction temperature range for LT8697IUDD#TRPBF?
The LT8697IUDD#TRPBF is rated for –40°C to +125°C junction temperature. This I-grade device is fully specified and guaranteed across that range, with thermal shutdown engaging above 150°C to protect against sustained overtemperature conditions. The exposed pad (Pin 25) must be soldered to PCB ground to achieve the specified θJC = 5°C/W thermal resistance required for reliable operation at full load.
How does LT8697IUDD#TRPBF implement cable drop compensation without Kelvin sensing?
The LT8697IUDD#TRPBF implements cable drop compensation by sourcing current from the USB5V pin through RCDC, proportional to load current measured across RSENSE (ISP–ISN), and mirroring that current via RCBL to raise the local VOUT. This creates a negative output impedance that offsets resistive losses in the cable-enabling precise 5 V regulation at the remote load using only two wires. The RCBL resistor value is calculated per RCBL = 20.55 × RSENSE × RCDC / RCABLE.
Can LT8697IUDD#TRPBF regulate output voltage when placed behind a USB power switch?
Yes. The LT8697IUDD#TRPBF supports dual feedback: it can regulate either directly at USB5V or at the output of an external USB switch via the SYS pin. When using SYS feedback, the LT8697IUDD#TRPBF limits maximum VOUT to 5.8 V to protect downstream devices. This configuration eliminates the need for separate overvoltage protection circuitry and allows regulation at the actual load point, even with switch voltage drops.
What is the purpose of the ICTRL pin on LT8697IUDD#TRPBF?
The ICTRL pin on LT8697IUDD#TRPBF adjusts the current limit threshold by modulating the VISP–VISN trip point between 4.5 mV and 51 mV. Applying 0 V to ICTRL sets the lowest limit (~0.5 A with 20 mΩ RSENSE); connecting to INTVCC sets the full-scale 48 mV threshold (~2.1 A). This enables precise, resistor-free current limit tuning-critical for meeting USB BC1.2 or proprietary charging specifications without changing the sense resistor.
Does LT8697IUDD#TRPBF support synchronization to an external clock?
Yes. The SYNC pin (Pin 1) accepts an external clock signal from 300 kHz to 2.2 MHz, forcing the LT8697IUDD#TRPBF into forced continuous mode and aligning SW transitions to the external edge. This feature enables EMI reduction through frequency dithering or synchronization with other converters in multi-rail systems-essential for noise-sensitive applications like automotive infotainment and medical USB peripherals.
LT8697IUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, USB
- Voltage - Input:
- 5V ~ 42V
- Number of Outputs:
- 1
- Voltage - Output:
- 5V ~ 5.25V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LT8697IUDD#TRPBF FAQ
1.How can I place an order for LT8697IUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8697IUDD#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 LT8697IUDD#TRPBF reliable?
The price and inventory of LT8697IUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8697IUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8697IUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8697IUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8697IUDD#TRPBF?
LT8697IUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8697IUDD#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 LT8697IUDD#TRPBF?
For technical support, including LT8697IUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8697IUDD#TRPBF requirements.
6.How does Aetrix verify that LT8697IUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8697IUDD#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 LT8697IUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8697IUDD#TRPBF?
All LT8697IUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8697IUDD#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 LT8697IUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8697IUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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