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Analog Devices Inc. LT8697HUDD#TRPBF
- Part No.:
- LT8697HUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LT8697HUDD#TRPBF.pdf
- Description:
- IC REG CONV USB 1OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
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Product details
Overview
LT8697HUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 2MHz synchronous step-down DC/DC converter optimized for 5V USB power delivery with cable drop compensation. It delivers up to 2.5A output, maintains ±1.3% 5V regulation over temperature, supports 5V–42V input, and features programmable current limit and forced continuous mode for fast transient response in automotive and industrial USB host applications.
For engineers reviewing the LT8697HUDD#TRPBF datasheet, LT8697HUDD#TRPBF pinout, LT8697HUDD#TRPBF application, or LT8697HUDD#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the H-grade –40°C to 150°C automotive-qualified variant.
Technical Context
The LT8697HUDD#TRPBF implements constant-frequency current-mode control with an adjustable 300kHz–2.2MHz switching frequency set 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 5.8V for fault protection.
Cable drop compensation is implemented by sourcing current from USB5V through RCDC, proportional to load current sensed across RSENSE, and mirrored into RCBL to raise VOUT-enabling precise 5V regulation at the remote load end of long cables without Kelvin sensing. Forced continuous mode ensures negative inductor current capability and sub-100µs load-step recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 42V - supports wide-range automotive battery inputs including cold-crank and load-dump conditions. |
| Output Voltage Accuracy | ±1.3% over –40°C to 150°C - ensures stable 5V USB compliance across full H-grade junction temperature range. |
| Max Output Current | 2.5A - sufficient for USB-C PD sink negotiation and legacy 5V/2.4A charging without derating at 150°C. |
| Switching Frequency | Adjustable 300kHz–2.2MHz - enables compact magnetics and EMI optimization; 2MHz operation avoids AM band. |
| Min On-Time | 45ns - supports high VIN-to-VOUT conversion ratios (e.g., 42V→5V) without pulse-skipping instability. |
| Dropout Voltage | 450mV at 2.1A - maintains regulation under low-input conditions such as automotive stop-start cycles. |
| Thermal Rating | Junction temp rated to 150°C - qualified for under-hood automotive environments per AEC-Q100 stress test conditions. |
Pinout & Package
LT8697HUDD#TRPBF is housed in a thermally enhanced 24-lead 3mm × 5mm QFN package (UDD) with exposed pad (Pin 25) soldered to PCB ground for θJC = 5°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UV (4) | Enable / Input Undervoltage Lockout | Hysteretic enable threshold (0.94–1.06V) allows programmable VIN shutdown; internal 40mV hysteresis prevents chatter during brownout. |
| PG (19) | Power Good Open-Drain Output | Asserts high only when USB5V is within ±9% of 5V and no fault exists; 40µs delay ensures stable regulation before system boot. |
| USB5V (20) | Main Output Voltage Sense & Cable Compensation Input | Serves as both regulated 5V reference point and current-sink node for RCDC-based cable drop compensation; clamped to 9V for ESD robustness. |
| ISP/ISN (21/22) | Differential Current Sense Inputs | Measure voltage drop across external sense resistor (e.g., 20mΩ) to enable accurate, temperature-stable output current limiting up to 2.5A. |
| RCBL (23) | Cable Drop Compensation Programming | Sinks current proportional to load current (IUSB5V); resistor to GND sets compensation gain - e.g., 13.7kΩ enables 0.3Ω cable compensation. |
| ICTRL (24) | Current Limit Threshold Adjustment | Accepts 0–1V analog input to scale current limit threshold from 4.5mV to 48mV, enabling fine-tuned overcurrent protection without changing RSENSE. |
| SYS (18) | Secondary Feedback & Internal Regulator Supply | Provides secondary regulation path (max 5.8V clamp), supplies INTVCC when >3.3V, and enables dual-loop control for USB switch integration. |
| GND (25) | Exposed Thermal Pad | Must be soldered to large PCB copper area - primary thermal path; reduces θJA to 46°C/W and enables 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Cable Drop Compensation | Enables precise 5V regulation at remote USB socket using standard wiring - eliminates need for separate sense lines or external amplifiers. |
| Forced Continuous Mode (FCM) | Guarantees uninterrupted switching down to zero load, enabling <100µs 0→2A transient recovery and bidirectional energy transfer for improved stability. |
| Dual Feedback Architecture | Allows regulation at either USB5V pin (direct) or SYS pin (post-USB-switch), with automatic 5.8V output clamp to protect downstream devices during faults. |
| Accurate Programmable Current Limit | ±10% current limit accuracy over temperature with ICTRL analog scaling - supports safe USB port power management without external current monitors. |
| High-Efficiency 2MHz Operation | 93% efficiency at 2.1A/5V from 12V input - achieves compact solution size while maintaining >85% efficiency even at light loads due to low quiescent current. |
Applications
| Automotive USB Host Ports | Industrial USB Charging Hubs |
|---|---|
|
Use Scenario: Powering USB peripherals in vehicle infotainment systems with 3-meter AWG20 cable runs between ECU and center console ports. IC Role / Device Role / Timing Role: Primary 5V buck regulator with active cable compensation and FCM for rapid load transients during accessory plug/unplug events. Use Value: Maintains 4.925–5.075V at load under 2.1A, eliminating voltage droop-induced disconnects and ensuring USB-IF compliance across –40°C to 125°C ambient. |
Use Scenario: Centralized 5V power for multi-port industrial docking stations powering barcode scanners, HMIs, and wireless modules. IC Role / Device Role / Timing Role: High-reliability 5V source with latch-off current limiting and PG monitoring for fault-safe hot-swap operation. Use Value: Programmable 2.5A current limit and open-drain PG signal enable firmware-controlled port disable and diagnostics without external logic. |
| Precision 5V Test Equipment Supplies | USB-PD Sink Companion Regulator |
|
Use Scenario: Lab-grade 5V reference supply for calibration equipment requiring <±15mV line/load regulation over 6–42V input variation. IC Role / Device Role / Timing Role: Low-noise, high-PSRR 5V regulator with dual feedback and 45ns min-on-time for stable operation at extreme duty cycles. Use Value: 6mV line regulation (6–42V) and ±1.3% total accuracy eliminate need for post-regulation LDOs in metrology-grade designs. |
Use Scenario: Secondary 5V rail in USB-C PD adapters that negotiate higher voltages but must deliver legacy 5V/3A to attached devices. IC Role / Device Role / Timing Role: Fast-transient 5V buck stage synchronized to primary controller via SYNC pin for coordinated power sequencing. Use Value: 2MHz sync capability and 45ns min-on-time allow tight layout with shared thermal plane and minimal footprint vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S-1#TRPBF | Same 42V input, 5V/4A output, but lacks cable drop compensation and USB5V-specific feedback architecture. | Designed for general-purpose high-current 5V rails; no native USB socket regulation or RCBL/ICTRL interface. | Choose when cable compensation is unnecessary and higher output current (4A) is required; requires external current monitor for USB safety. |
| MPQ4420AGL-AEC1-Z | Automotive-grade 42V/2.5A buck with integrated MOSFETs, but no dedicated USB5V pin, cable compensation, or dual feedback loop. | Targets broad automotive DC/DC needs; lacks USB-specific features like PG window comparator and USB5V clamp. | Choose for cost-sensitive AEC-Q100-compliant designs where USB protocol-aware regulation is not required. |
Compared with LT8697HUDD#TRPBF, LT8640S-1#TRPBF offers higher current but no cable compensation, while MPQ4420AGL-AEC1-Z provides AEC-Q100 qualification at lower integration level - neither replicates the LT8697HUDD#TRPBF's USB-socket-centric regulation architecture or programmable 5V endpoint accuracy.
Availability
LT8697HUDD#TRPBF is available at Aetrix Electronics and suitable for automotive USB host ports, industrial charging hubs, precision 5V test equipment, and USB-PD sink companion supplies requiring stable component supply across extended temperature ranges.
Supply support for LT8697HUDD#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 ICs including the LT8697 family.
The LT8697 series was designed specifically for USB power delivery systems requiring precise 5V regulation at the connector - integrating cable compensation, current monitoring, and fault protection into a single monolithic buck regulator.
FAQ
What is the operating temperature range for LT8697HUDD#TRPBF?
The LT8697HUDD#TRPBF is specified for a junction temperature range of –40°C to 150°C and is qualified for automotive under-hood applications. This H-grade variant exceeds the E- and I-grade versions (–40°C to 125°C) and is tested per AEC-Q100 stress requirements, making LT8697HUDD#TRPBF suitable for high-ambient environments where thermal headroom is critical.
How does LT8697HUDD#TRPBF implement cable drop compensation?
LT8697HUDD#TRPBF uses its RCBL pin to source current proportional to load current sensed across RSENSE, which flows through RCDC to raise the local VOUT above 5V - compensating for IR drop in the cable. The relationship is VOUT = 5V + 20.55 × ILOAD × RSENSE × RCDC / RCBL, with SYS pin clamping VOUT to 5.8V for safety. This enables LT8697HUDD#TRPBF to maintain 5V at the remote USB socket without Kelvin sensing wires.
Can LT8697HUDD#TRPBF be synchronized to an external clock?
Yes, LT8697HUDD#TRPBF supports external synchronization via its SYNC pin (Pin 1). When driven with a TTL/CMOS clock signal between 300kHz and 2.2MHz, the device locks its internal oscillator and operates in forced continuous mode - ensuring deterministic timing, reduced EMI, and seamless coordination with other switching regulators in multi-rail systems. LT8697HUDD#TRPBF requires no additional components for sync operation.
What is the purpose of the SYS pin on LT8697HUDD#TRPBF?
The SYS pin on LT8697HUDD#TRPBF serves three roles: (1) secondary feedback input that caps VOUT at 5.8V for fault protection, (2) auxiliary power supply for INTVCC when biased >3.3V (improving efficiency), and (3) regulation point when used with an external USB switch - allowing LT8697HUDD#TRPBF to regulate downstream of the switch rather than at the IC output. This dual-path architecture is unique to LT8697HUDD#TRPBF.
Does LT8697HUDD#TRPBF support programmable current limiting?
Yes, LT8697HUDD#TRPBF provides two independent current-limit controls: (1) hardware-set limit via RSENSE value (2.9–6A depending on grade), and (2) analog-adjustable threshold via ICTRL pin (0–1V scales VISP–VISN limit from 4.5mV to 48mV). This enables precise, temperature-stable current limiting without external components - a core feature distinguishing LT8697HUDD#TRPBF from generic buck controllers.
LT8697HUDD#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LT8697HUDD#TRPBF FAQ
1.How can I place an order for LT8697HUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8697HUDD#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 LT8697HUDD#TRPBF reliable?
The price and inventory of LT8697HUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8697HUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8697HUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8697HUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8697HUDD#TRPBF?
LT8697HUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8697HUDD#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 LT8697HUDD#TRPBF?
For technical support, including LT8697HUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8697HUDD#TRPBF requirements.
6.How does Aetrix verify that LT8697HUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8697HUDD#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 LT8697HUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8697HUDD#TRPBF?
All LT8697HUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8697HUDD#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 LT8697HUDD#TRPBF part is unused and in its original packaging.
Return procedure for LT8697HUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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