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Analog Devices Inc. LT8698SEV#PBF
- Part No.:
- LT8698SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 32-TFQFN Exposed Pad, 30 Leads
- Datasheet:
-
LT8698SEV#PBF.pdf
- Description:
- 5V/ 3A, USB CHARGER WITH CABLE C
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LT8698SEV#PBF from Analog Devices is a synchronous monolithic step-down USB charger IC delivering up to 3A at 5V from 6V–42V input, featuring programmable cable drop compensation, integrated high-speed USB 2.0 dataline switches (HD+/HD−, LD+/LD−), and AEC-Q100 qualification for automotive USB charging applications.
For engineers reviewing the LT8698SEV#PBF datasheet, LT8698SEV#PBF pinout, LT8698SEV#PBF application, or LT8698SEV#PBF equivalent, key selection considerations include VIN range (6–42V), VBUS regulation accuracy with RCBL-based cable compensation, fault reporting via FLT/STATUS pins, USB BC 1.2 profile support (CDP/DCP/SDP), and EMI performance enabled by Silent Switcher®2 and spread-spectrum modulation.
Technical Context
The LT8698SEV#PBF integrates a 3A synchronous buck regulator with dual USB 2.0 data path switches, current-sense amplifier (RSEN-based), and programmable USB charging profile logic controlled by SEL1–SEL3. Its control architecture combines peak-current-mode PWM with selectable forced-continuous or pulse-skipping operation via SYNC/MODE pin.
It implements robust protection including overvoltage (USB5V fault threshold ±7% hysteresis), overcurrent (latched 2.65A limit with 4.2ms timeout), thermal shutdown (>150°C), and dataline short-circuit tolerance up to 20V on HD+/HD− with IEC61000-4-2 ESD rating (8kV contact / 15kV air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6V to 42V - supports wide automotive battery transients and industrial 24V/36V rails without external pre-regulation. |
| Output Current | Up to 3A at 5V - delivers full USB-C PD-compatible power for fast-charging smartphones and accessories. |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - enables compact magnetics and noise shaping for CISPR25 Class 5 compliance. |
| Cable Drop Compensation | Programmable via RCBL pin - maintains ±1% VBUS regulation at remote USB socket despite >400mΩ cable resistance. |
| Dataline Protection | HD+/HD− withstand 20V shorts; ESD rated to IEC61000-4-2 8kV contact / 15kV air - eliminates need for external TVS diodes on D+/D− lines. |
| USB Profiles | Supports BC 1.2 CDP, DCP, SDP plus 1A/2A/2.1A/2.4A proprietary profiles - enables universal compatibility across legacy and modern devices. |
| Package | 32-lead LQFN (6mm × 4mm × 0.94mm) - thermally enhanced with exposed pads and multiple GND/PGND pins for low θJA (22°C/W). |
| Qualification | AEC-Q100 Grade 1 (–40°C to +125°C TJ) - validated for under-hood and infotainment system deployment. |
Pinout & Package
LT8698SEV#PBF uses a 32-lead LQFN package (6mm × 4mm × 0.94mm) with 0.75mm pitch, integrated exposed thermal pad (pins 33–38), and corner support pads (pins 39–42). All GND and PGND pins (1, 11, 14, 17, 23, 27, 32, 33–42) are internally shorted and must be soldered to PCB ground plane for optimal thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (29,30) | Main power input | Accepts 6–42V; requires ≥2µF local bypass to PGND; two 0.1µF caps recommended between VIN–PGND (pins 27 & 32) for EMI suppression. |
| SW (24,25) | Switch node | Connects to inductor; high dV/dt node-must be minimized in layout to reduce radiated emissions. |
| OUT/ISP (22) | Regulator output & current sense+ | Kelvin-connected to RSEN for accurate cable compensation and current limiting; ties to inductor and output capacitor. |
| BUS/ISN (21) | VBUS output & current sense− | Drives USB VBUS rail; provides negative input to current sense amp; Kelvin-connected to RSEN for precision sensing. |
| USB5V (20) | Feedback reference | Used for cable drop compensation loop; connect RCDC from USB5V to BUS/ISN to set compensation gain. |
| RCBL (19) | Cable compensation programming | Sources 2mA; resistor to GND sets compensation current-determines voltage drop correction slope. |
| HD+/HD− (16,15) | High-side USB data lines | Connect to USB socket D+/D−; tolerate 20V shorts and ESD; disconnect if >4.5V detected for safety. |
| LD+/LD− (12,13) | Low-side USB data lines | Connect to µController D+/D−; enable host-side USB communication with isolation during faults. |
| FLT (4) | Fault indicator | Open-drain output pulled low after 4.2ms sustained fault (OV, OC, thermal); valid only when VIN > 4.5V and EN/UV > 1.46V. |
| STATUS (5) | Configurable status output | Open-drain; behavior defined by SEL1–SEL3 (e.g., current threshold alert, profile ID, or VBUS OK signal). |
| SEL1–SEL3 (6–8) | USB profile selector | Tristate inputs (low/high/float); configure BC 1.2 mode or proprietary charging profile; debounced 1.5ms. |
| EN/UV (3) | Enable & UVLO input | 1.31V falling / 1.46V rising threshold; <1µA shutdown current below 0.25V; resistor divider enables custom UVLO. |
| SYNC/MODE (10) | Frequency & mode control | Ground = pulse-skip; float = forced continuous (RT-set); INTVCC = spread-spectrum; external clock = sync mode. |
| RT (9) | Frequency set | Resistor to GND programs fSW from 300kHz to 3MHz; enables optimization of efficiency vs. size vs. EMI. |
| CLAMP (18) | ESD clamp bias | Bypass with 0.1µF/20V ceramic to GND; stabilizes internal ESD protection circuitry during transients. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Reduces radiated EMI by >30dB vs. conventional buck regulators-meets CISPR25 Class 5 without metal shielding. |
| Integrated USB 2.0 dataline switches | Eliminates need for discrete USB switches and external protection components-reduces BOM count and board area. |
| Programmable cable drop compensation | Maintains ±1% VBUS regulation at end of 3m AWG24 cable (400mΩ)-enables reliable charging in automotive harnesses. |
| Selectably spread-spectrum modulation | Lowers peak EMI amplitude by spreading switching energy across 200kHz bandwidth-simplifies EMI filter design. |
| AEC-Q100 Grade 1 qualification | Validated for operation from –40°C to +125°C junction temperature-supports under-dash and engine bay deployments. |
| USB BC 1.2 and multi-profile support | Hardware-configured (SEL1–SEL3) detection of CDP, DCP, SDP, and vendor-specific 1A/2A/2.1A/2.4A modes-no firmware required. |
Applications
| Automotive USB Charging Port | Industrial USB Power Hub |
|---|---|
Use Scenario: 12V/24V vehicle electrical system powering smartphones, tablets, and dashcams via center console or rear-seat USB ports. IC Role / Device Role / Timing Role: Primary 5V USB VBUS regulator with cable compensation, dataline switching, and fault monitoring. Use Value: Maintains 5.00V ±1% at USB socket despite 400mΩ wiring loss; survives load dump and cold crank; meets automotive EMC requirements. | Use Scenario: Factory automation equipment requiring robust, isolated USB power for barcode scanners, HMIs, or configuration tools. IC Role / Device Role / Timing Role: Standalone USB power controller with integrated protection and profile negotiation. Use Value: Eliminates external USB switch and TVS arrays; supports hot-plug detection and short-circuit recovery without host intervention. |
| USB OTG Power Source | Embedded System USB Host |
Use Scenario: Portable medical device acting as USB host to connect peripherals like glucose meters or ECG sensors. IC Role / Device Role / Timing Role: VBUS regulator with reset and disable functions enabling USB On-The-Go (OTG) role switching. Use Value: Integrated VBUS reset and regulator disable allow seamless host/peripheral role reversal per USB OTG spec. | Use Scenario: Ruggedized IoT gateway providing USB connectivity for firmware updates and diagnostics in harsh environments. IC Role / Device Role / Timing Role: High-reliability USB power manager with fault logging via FLT/STATUS pins. Use Value: Fault latching and de-glitched STATUS output enable deterministic system-level error handling and field diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8698SJ#PBF | Same functionality but rated for –40°C to +150°C junction temperature; higher thermal endurance. | Required for under-hood applications exceeding 125°C ambient; not needed for cabin-mounted chargers. | Select LT8698SJ#PBF only when operating junction temperature exceeds 125°C; otherwise LT8698SEV#PBF is cost-optimized. |
| TPS65987D-SR | USB-C PD controller with integrated buck converter; supports 5–20V output, CC logic, and PD messaging. | Targets USB-C PD applications requiring variable voltage negotiation; lacks native BC 1.2 analog detection. | Choose TPS65987D-SR for USB-C PD compliance; choose LT8698SEV#PBF for legacy USB-A ports with BC 1.2 and superior EMI performance. |
Compared with LT8698SJ#PBF, LT8698SEV#PBF offers identical feature set at lower cost for 125°C-limited environments; compared with TPS65987D-SR, it delivers superior EMI performance and BC 1.2 compatibility but lacks USB-C PD protocol stack and variable output capability.
Availability
LT8698SEV#PBF is available at Aetrix Electronics and suitable for automotive USB charging ports, industrial USB hubs, and embedded USB host systems requiring stable component supply, AEC-Q100 qualification, and production-ready EMI compliance.
Supply support for LT8698SEV#PBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8698S product line delivers highly integrated USB power solutions with cable compensation and dataline protection, designed specifically for automotive-grade USB charging and industrial USB host applications where reliability, EMI, and thermal performance are critical.
FAQ
What is the maximum input voltage supported by the LT8698SEV#PBF?
The LT8698SEV#PBF supports an absolute maximum input voltage of 42V on the VIN pins, with recommended operating range from 6V to 42V. This wide input range accommodates automotive battery transients including load dump (up to 40V) and cold-crank conditions while maintaining regulated 5V USB output. The device includes internal protection against overvoltage stress beyond this rating.
How does cable drop compensation work in the LT8698SEV#PBF?
The LT8698SEV#PBF implements cable drop compensation by sensing output current via the RSEN resistor and injecting a proportional correction voltage into the USB5V feedback loop using the RCBL pin. A resistor from RCBL to GND sets the compensation gain, allowing precise adjustment to offset voltage drop across long cables-verified to maintain ±1% VBUS regulation at the remote USB socket even with 400mΩ series resistance.
Does the LT8698SEV#PBF support USB Battery Charging Specification 1.2?
Yes, the LT8698SEV#PBF natively supports USB BC 1.2 through hardware-configurable SEL1–SEL3 pins, enabling detection and compliance with Charging Downstream Port (CDP), Dedicated Charging Port (DCP), and Standard Downstream Port (SDP) profiles without firmware. It also supports common proprietary profiles (1A, 2A, 2.1A, 2.4A) via the same pin-strapping interface.
What is the purpose of the HD+ and HD− pins on the LT8698SEV#PBF?
The HD+ and HD− pins on the LT8698SEV#PBF are the high-voltage side terminals of the integrated USB 2.0 data line switches, connecting directly to the USB socket's D+ and D− lines. They provide robust protection-tolerating shorts up to 20V and ESD events per IEC61000-4-2 (8kV contact / 15kV air)-and automatically disconnect if either pin exceeds 4.5V, safeguarding the upstream µController.
Can the LT8698SEV#PBF operate in forced continuous conduction mode?
Yes, the LT8698SEV#PBF can operate in forced continuous conduction mode by floating the SYNC/MODE pin, which enables RT-programmed switching frequency with continuous inductor current regardless of load. Alternatively, tying SYNC/MODE to INTVCC activates spread-spectrum modulation for improved EMI performance while maintaining forced continuous operation.
LT8698SEV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-TFQFN Exposed Pad, 30 Leads
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Converter, USB
- Voltage - Input:
- 6V ~ 42V
- Number of Outputs:
- 1
- Voltage - Output:
- Multiple
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8698SEV#PBF FAQ
1.How can I place an order for LT8698SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8698SEV#PBF 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 LT8698SEV#PBF reliable?
The price and inventory of LT8698SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8698SEV#PBF is usually 5 days.
3.What payment methods are accepted for LT8698SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8698SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8698SEV#PBF?
LT8698SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8698SEV#PBF 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 LT8698SEV#PBF?
For technical support, including LT8698SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8698SEV#PBF requirements.
6.How does Aetrix verify that LT8698SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8698SEV#PBF 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 LT8698SEV#PBF meets industry standards.
7.What is the process for return or replacement of LT8698SEV#PBF?
All LT8698SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8698SEV#PBF, 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 LT8698SEV#PBF part is unused and in its original packaging.
Return procedure for LT8698SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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