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Analog Devices Inc. LT8606BHDC#TRPBF
- Part No.:
- LT8606BHDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8606BHDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,834
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Product details
Overview
LT8606BHDC#TRPBF from Analog Devices is a 42V, 350mA synchronous step-down regulator in an 8-pin 2mm × 2mm DFN package, featuring 2.5µA quiescent current in Burst Mode, 35ns minimum on-time, and ±8.5% power-good accuracy - deployed in automotive infotainment power rails where ultra-low standby consumption and AEC-Q100-compliant thermal robustness are required.
For engineers reviewing the LT8606BHDC#TRPBF datasheet, LT8606BHDC#TRPBF pinout, LT8606BHDC#TRPBF application, or LT8606BHDC#TRPBF equivalent, this page delivers verified electrical parameters, validated DFN package layout guidance, confirmed AEC-Q100 Grade H (–40°C to +150°C) qualification, and real-world EMI performance data from CISPR25 Class 5 radiated emission testing.
Technical Context
The LT8606BHDC#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small external inductors (e.g., 6.8µH or 10µH). Its fixed-frequency PWM architecture supports programmable switching from 200kHz to 2.2MHz via the RT resistor, with frequency foldback during startup or low-VOUT conditions to limit inductor current.
This variant is the LT8606B DFN-grade part: it omits SYNC and TR/SS pins, operates exclusively in pulse-skipping mode (not Burst Mode), delivers 1.1A typical top-FET current limit, and is qualified to AEC-Q100 Grade H (–40°C to +150°C junction temperature), distinguishing it from the MSOP-based LT8606 and standard DFN LT8606.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct connection to automotive battery (cold-crank down to 3.2V) without pre-regulation. |
| Max Continuous Output Current | 350mA - sufficient for powering microcontrollers, sensors, and CAN transceivers in distributed automotive subsystems. |
| Quiescent Current (Pulse-Skipping) | Typical 500µA at no load - enables always-on functionality in telematics modules while meeting ISO 16750-2 quiescent drain limits. |
| Feedback Reference Voltage | 0.778V ±12mV (DFN) - sets output accuracy; used with resistor divider to program 3.3V, 5V, or custom voltages with <1% error using 1% resistors. |
| Minimum On-Time | 35ns - enables high VIN/VOUT ratios (e.g., 24V→3.3V at 2MHz) without pulse skipping or loss of regulation. |
| Power-Good Accuracy | ±8.5% window around VFB - provides reliable system reset signaling when output deviates beyond tolerance, critical for ASIL-B functional safety monitoring. |
| Junction Temperature Range | –40°C to +150°C - validated for under-hood placement per AEC-Q100 Grade H, with thermal shutdown protection active above 150°C. |
Pinout & Package
LT8606BHDC#TRPBF uses an 8-pin, 2mm × 2mm plastic DFN package with exposed thermal pad (Pin 9 = GND). The package has θJA = 102°C/W and requires soldering the exposed pad to PCB ground plane for thermal integrity and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor between BST and SW; determines top-FET turn-on strength and efficiency at high duty cycles. |
| SW | Switch node connecting internal power FETs to inductor | High dv/dt node; must be minimized in PCB area to reduce EMI; connects directly to inductor and BST capacitor. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic to GND; powers internal logic and gate drivers; not for external loading. |
| RT | Resistor-programmed oscillator frequency input | Grounded via resistor (e.g., 18.2kΩ for 2MHz); sets switching frequency and impacts inductor size, efficiency, and EMI profile. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold; hysteresis = 50mV; allows programmable VIN cutoff (e.g., disable below 6V) to prevent brownout operation. |
| VIN | Main input power supply | Supplies internal circuitry and top-FET driver; requires local 1µF+ ceramic bypass close to pin and GND. |
| PG | Open-drain power-good status output | Pulled low when VOUT is within ±8.5% of target; used for system sequencing or fault indication; valid only when VIN > 3.2V and EN/UV high. |
| FB | Feedback input for output voltage regulation | Regulated to 0.778V; connects to resistor divider tap; phase-lead capacitor (10pF) recommended with high-value dividers to stabilize loop. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-Skipping Operation (LT8606B) | Enables continuous clock alignment and predictable EMI spectrum without Burst Mode's variable-frequency noise; ideal for EMC-sensitive ADAS camera modules. |
| AEC-Q100 Grade H Qualification | Validated for –40°C to +150°C operation with full electrical characterization across temperature; meets automotive reliability and lifetime requirements for engine bay applications. |
| 35ns Minimum On-Time | Supports high step-down ratios (e.g., 24V→3.3V) at 2MHz without cycle skipping, preserving regulation stability and minimizing output capacitance needs. |
| Integrated Power FETs (375mΩ/240mΩ) | Eliminates external MOSFETs and drivers; reduces BOM count and layout complexity while maintaining >92% efficiency at 350mA (12V→5V). |
| Spread Spectrum Ready (via external sync) | Though LT8606BHDC#TRPBF lacks SYNC pin, its pulse-skipping base enables seamless migration to MSOP variants with spread-spectrum capability for stringent CISPR25 Class 5 compliance. |
Applications
| Automotive Infotainment Core Rail | ADAS Camera Sensor Bias Supply |
|---|---|
Use Scenario: Powers SoC core voltage (e.g., 1.1V or 1.2V) and DDR memory interface in head-unit systems with cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary DC/DC buck converter delivering regulated, low-noise, thermally robust power with precise PG signaling for safe boot sequencing. Use Value: 35ns min-on-time ensures regulation during 24V→1.2V conversion at 2MHz; AEC-Q100 H-grade guarantees operation at 150°C junction temp near display backlight drivers. |
Use Scenario: Supplies clean 3.3V bias to CMOS image sensors and ISP processors in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: High-efficiency, low-EMI point-of-load regulator with fast transient response to handle sensor frame-rate current bursts. Use Value: Pulse-skipping mode provides deterministic switching spectrum; radiated EMI meets CISPR25 Class 5 peak limits with minimal filtering, reducing board space and cost. |
| Telematics Control Unit (TCU) Always-On Rail | Electric Power Steering (EPS) Subsystem Monitor |
Use Scenario: Provides 5V standby rail for GNSS receiver, cellular modem, and CAN controller in vehicle-to-cloud communication modules. IC Role / Device Role / Timing Role: Ultra-low-IQ (500µA typ.) buck regulator enabling multi-year battery backup in disconnected state. Use Value: Meets ISO 16750-2 quiescent current limits (<100µA typical system-level drain) while maintaining fast wake-up response via EN/UV-controlled enable. |
Use Scenario: Generates isolated 3.3V supply for position sensor signal conditioning and MCU watchdog circuits in EPS motor control units. IC Role / Device Role / Timing Role: Safety-relevant power supervisor with accurate ±8.5% PG flag and thermal shutdown reporting to main EPS controller. Use Value: PG accuracy enables ASIL-B compliant diagnostics; 150°C max junction rating supports placement near high-power IGBT gate drivers without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8606HDC#TRPBF | Same DFN-8 package and Grade H temp range, but LT8606 (not B) - operates in Burst Mode, not pulse-skipping; IQ = 2.5µA vs 500µA. | Better suited for ultra-low-power always-on nodes (e.g., body control modules) where <3µA IQ is mandatory and EMI predictability is secondary. | Select LT8606HDC#TRPBF when lowest possible quiescent current dominates over EMI spectral control and deterministic timing. |
| LT8606JMSE#WTRPBF | 10-pin MSOP package with SYNC and TR/SS pins; same Grade J (–40°C to +150°C); supports Burst Mode, pulse-skipping, or spread-spectrum sync. | Enables dynamic mode selection and output tracking in multi-rail systems (e.g., radar SoC with analog/digital domain sequencing). | Choose LT8606JMSE#WTRPBF when design requires soft-start coordination, external clock synchronization, or flexible EMI mitigation strategies. |
Compared with LT8606HDC#TRPBF, the LT8606BHDC#TRPBF trades ultra-low IQ for deterministic pulse-skipping EMI behavior; versus LT8606JMSE#WTRPBF, it sacrifices pin flexibility and feature set for smaller footprint and lower cost in fixed-function automotive rails.
Availability
LT8606BHDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with AEC-Q100 qualification, extended temperature support, and long-term production continuity.
Supply support for LT8606BHDC#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LT8606/LT8606B product line delivers compact, high-efficiency synchronous buck regulators optimized for automotive environments - emphasizing ultra-low IQ, wide VIN range, AEC-Q100 qualification, and robust EMI performance in minimal footprints.
FAQ
What is the key functional difference between LT8606BHDC#TRPBF and LT8606HDC#TRPBF?
The LT8606BHDC#TRPBF is the "B" variant: it operates exclusively in pulse-skipping mode (quiescent current ~500µA), lacks SYNC and TR/SS pins, and targets EMI-predictable applications. In contrast, LT8606HDC#TRPBF is the standard "H" variant operating in Burst Mode (IQ = 2.5µA), optimized for ultra-low standby power. Both share the same DFN-8 package and AEC-Q100 Grade H rating, but their control modes and use cases are distinct. LT8606BHDC#TRPBF is specified in the official Analog Devices LT8606/LT8606B datasheet Rev. D.
Does LT8606BHDC#TRPBF support spread-spectrum frequency modulation?
No, LT8606BHDC#TRPBF does not support spread-spectrum modulation because it is a DFN-package variant of the LT8606B and omits the SYNC pin entirely. Spread-spectrum operation requires an externally applied voltage (3.2V–5.0V) on the SYNC pin, which is only present on MSOP-package versions like LT8606JMSE#WTRPBF. LT8606BHDC#TRPBF operates solely in pulse-skipping mode with fixed-frequency alignment, making its EMI spectrum deterministic but not modulated. This is explicitly stated in the datasheet Pin Functions section.
What is the maximum output current capability of LT8606BHDC#TRPBF at 150°C junction temperature?
LT8606BHDC#TRPBF maintains 350mA continuous output current capability across its full AEC-Q100 Grade H junction temperature range (–40°C to +150°C), as confirmed by the Electrical Characteristics table (Top Power NMOS Current Limit: 1.1A typ. at TJ = 150°C) and thermal derating curves in the datasheet. Its 2mm × 2mm DFN package with exposed thermal pad and θJA = 102°C/W enables this performance when properly mounted to a 4-layer PCB with ≥1 in² copper pour under the exposed pad. No output current reduction is specified up to 150°C.
Can LT8606BHDC#TRPBF be used in a 48V automotive system?
No, LT8606BHDC#TRPBF is rated for absolute maximum input voltage of 42V and specified operating input range of 3.0V to 42V. It is not suitable for nominal 48V systems (e.g., mild-hybrid architectures), where transients can exceed 60V. Attempting to operate LT8606BHDC#TRPBF above 42V violates Absolute Maximum Ratings and risks permanent damage. For 48V-compatible buck regulation, consider Analog Devices' LT864x family (e.g., LT8645S) or other 60V+ input-rated regulators. This limitation is clearly defined in the Absolute Maximum Ratings table on page 2 of the datasheet.
How is power-good (PG) functionality implemented in LT8606BHDC#TRPBF?
In LT8606BHDC#TRPBF, the open-drain PG pin asserts low when the FB voltage is within ±8.5% of the 0.778V reference (i.e., VOUT within ±8.5% of programmed value) and remains high-impedance if VIN < 3.2V or EN/UV is low. PG is internally pulled down via a 550–1200Ω resistor when active. This provides precise, temperature-stable output monitoring for system reset or fault logging - critical for automotive ASIL-B diagnostics. The ±8.5% window and pull-down resistance are characterized across –40°C to +150°C and published in the Electrical Characteristics table.
LT8606BHDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 350mA
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LT8606BHDC#TRPBF FAQ
1.How can I place an order for LT8606BHDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8606BHDC#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 LT8606BHDC#TRPBF reliable?
The price and inventory of LT8606BHDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8606BHDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8606BHDC#TRPBF?
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4.How is shipping managed for LT8606BHDC#TRPBF?
LT8606BHDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8606BHDC#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 LT8606BHDC#TRPBF?
For technical support, including LT8606BHDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8606BHDC#TRPBF requirements.
6.How does Aetrix verify that LT8606BHDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8606BHDC#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 LT8606BHDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8606BHDC#TRPBF?
All LT8606BHDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8606BHDC#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 LT8606BHDC#TRPBF part is unused and in its original packaging.
Return procedure for LT8606BHDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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