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Analog Devices Inc. LT8606BHDC#TRMPBF
- Part No.:
- LT8606BHDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT8606BHDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:339
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Product details
Overview
LT8606BHDC#TRMPBF from Analog Devices is a 42V, 350mA synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, and internal compensation. It delivers regulated 3.3V/5V outputs from 3.0–42V input, supports 200kHz–2.2MHz switching (RT-programmable), and features ±8.5% power-good monitoring - used in automotive infotainment power rails requiring ultra-low IQ and AEC-Q100-compliant operation.
For engineers reviewing the LT8606BHDC#TRMPBF datasheet, LT8606BHDC#TRMPBF pinout, LT8606BHDC#TRMPBF application, or LT8606BHDC#TRMPBF equivalent, key selection criteria include its 35ns minimum on-time, 2mm × 2mm DFN-8 package with exposed thermal pad, pulse-skipping mode (LT8606B variant), –40°C to 150°C junction rating, and compatibility with small inductors for space-constrained ECU designs.
Technical Context
The LT8606BHDC#TRMPBF implements a constant-frequency peak current mode architecture with internal 0.778V feedback reference and programmable oscillator via RT resistor. Its fast 35ns minimum on-time enables high VIN/VOUT ratios (e.g., 42V→3.3V) without frequency foldback under light load.
As the B-grade DFN variant, it omits SYNC and TR/SS pins and is factory-configured for pulse-skipping mode - delivering higher light-load IQ (~300–500µA) than Burst Mode but enabling deterministic timing alignment and spread-spectrum modulation when SYNC is tied high (via external pull-up).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports direct battery connection in 12V/24V automotive systems without pre-regulation. |
| Max Continuous Output Current | 350mA - sufficient for powering microcontrollers, sensors, and CAN transceivers in compact ECUs. |
| Quiescent Current (Pulse-Skipping) | ~300–500µA at no load - balances low standby power with deterministic switching timing. |
| Switching Frequency Range | 200kHz to 2.2MHz (RT-programmable) - enables optimization of inductor size vs. efficiency in noise-sensitive domains. |
| Feedback Reference Voltage | 0.778V (±1.8% over temp) - sets output accuracy for 3.3V/5V rails using standard 1% resistors. |
| Power-Good Threshold | ±8.5% of VFB - provides reliable rail validation for downstream logic reset sequencing. |
| Min On-Time / Off-Time | 35ns / 93ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) while maintaining regulation. |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
Pinout & Package
LT8606BHDC#TRMPBF 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 for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 3.0–42V; must be locally bypassed with low-ESR ceramic capacitor near pin. |
| BST | Bootstrap supply for high-side switch | Requires 0.1µF ceramic capacitor between BST and SW; no series resistor allowed. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in layout to reduce EMI. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF ceramic to GND; not for external loading - powers internal logic/drivers. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold; hysteresis = 50mV; enables VIN monitoring or shutdown control. |
| PG | Open-drain power-good indicator | Pulled low when VOUT is within ±8.5% of target and no fault; requires external pull-up. |
| FB | Feedback input | Regulated to 0.778V; connects to resistor divider from VOUT - sets output voltage. |
| GND | Ground reference and thermal pad | Exposed pad (Pin 9) must be soldered to PCB ground plane for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping mode (LT8606B) | Deterministic switching alignment and spread-spectrum capability - reduces EMI peaks without burst-related jitter. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation - suitable for engine control, ADAS camera modules, and under-hood power supplies. |
| Internal compensation | Eliminates external compensation components - reduces BOM count and design iteration time for stable 350mA loads. |
| Low dropout operation | Supports >95% duty cycle - maintains regulation down to ~3.2V input for 3.3V output, critical during cold-crank conditions. |
| Fast transient response | Peak current mode + small inductor support enables <5µs recovery from 100mA→350mA load steps - stabilizes MCU core rails. |
| Small 2mm × 2mm DFN package | Enables <15mm² total solution size with 10µH inductor and 10µF output capacitor - ideal for space-constrained automotive modules. |
Applications
| Automotive Infotainment Power Rail | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC I/O, display interface, and audio codecs in head-unit systems with wide battery voltage range (6–16V) and cold-crank dips. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter with PG signaling for system reset coordination and fault reporting. Use Value: 2.5µA quiescent current in pulse-skipping mode extends battery life during vehicle sleep; AEC-Q100 H-grade ensures reliability at 150°C junction. |
Use Scenario: Supplies image sensor and ISP in front/rear-view cameras mounted near engine bay or bumper. IC Role / Device Role / Timing Role: High-efficiency, low-noise 3.3V regulator with spread-spectrum EMI reduction to avoid RF interference with radar/LiDAR bands. Use Value: 35ns min-on-time enables stable 42V→3.3V conversion during load-dump transients; DFN thermal pad sustains 150°C ambient operation. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Provides isolated 5V rail for digital I/O drivers and communication interfaces (RS-485, CAN) in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Input-filter tolerant buck regulator handling 40V surges per IEC 61000-4-5; PG signal validates rail before enabling field-side logic. Use Value: 42V absolute max rating and internal 1.05V EN/UV threshold allow direct connection to 24V industrial bus without external UVLO circuitry. |
Use Scenario: Generates 3.3V for cellular modem, GNSS receiver, and secure element in vehicle connectivity gateways. IC Role / Device Role / Timing Role: Secondary buck stage after primary 12V→5V conversion; soft-start disabled (no TR/SS pin) for fast boot sequence. Use Value: Pulse-skipping mode ensures clean, jitter-free clocking for high-speed UART and PCIe links; RT-programmable fSW avoids AM band interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8606HDC#TRMPBF | Burst Mode operation (not pulse-skipping); same package, temp grade, and pinout. | Lower IQ (1.7µA) at no load; higher output ripple in light-load conditions. | Select when ultra-low standby power dominates EMI or timing requirements. |
| LT8607EDC#TRMPBF | Higher 500mA output current; identical DFN-8 package; shares RT/SYNC/FB/PG pin functions. | Supports higher-power MCUs or dual-rail systems; requires larger inductor and output cap. | Choose when future-proofing for >350mA loads or adding auxiliary 1.8V rail via secondary LDO. |
Compared with LT8606BHDC#TRMPBF, the LT8606HDC#TRMPBF trades deterministic timing for lower IQ, while the LT8607EDC#TRMPBF extends current capability without changing board layout - enabling scalable power design across product variants.
Availability
LT8606BHDC#TRMPBF is available at Aetrix Electronics and suitable for automotive ECUs, ADAS camera modules, and industrial telematics systems requiring stable component supply, AEC-Q100 compliance, and high-temperature operation.
Supply support for LT8606BHDC#TRMPBF 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.
The LT8606/LT8606B belongs to Analog Devices' Silent Switcher®-compatible monolithic buck regulator family, engineered for ultra-low EMI and ultralow quiescent current in harsh automotive and industrial environments.
FAQ
What is the guaranteed operating temperature range for LT8606BHDC#TRMPBF?
The LT8606BHDC#TRMPBF is specified for a junction temperature range of –40°C to +150°C and is AEC-Q100 Grade H qualified. This rating is validated through production testing and applies across the full input voltage and load range - making LT8606BHDC#TRMPBF suitable for under-hood automotive applications where ambient temperatures exceed 125°C.
Does LT8606BHDC#TRMPBF support external frequency synchronization?
No, LT8606BHDC#TRMPBF does not support external synchronization. As the LT8606B DFN variant, it lacks the SYNC pin - unlike the MSOP version. It operates exclusively in pulse-skipping mode, with switching frequency set by the RT resistor. Spread-spectrum modulation is enabled by tying an external voltage (3.2–5.0V) to the unused SYNC pad location, but no external clock input is accepted.
How is output voltage programmed on LT8606BHDC#TRMPBF?
Output voltage is set using a resistor divider from VOUT to FB, where R1 = R2 × ((VOUT/0.778V) – 1). For example, a 5V output requires R1 = 5.45 × R2 (e.g., R2 = 100kΩ, R1 = 545kΩ). Use 1% tolerance resistors and add a 10pF capacitor from FB to VOUT when R1+R2 > 1MΩ to maintain stability - a requirement confirmed in the LT8606/LT8606B datasheet Rev. D, page 13.
What is the minimum inductor value recommended for LT8606BHDC#TRMPBF at 2MHz?
For 2MHz operation, the recommended minimum inductor is 6.8µH (e.g., Coilcraft XAL6060-682ME). This value balances peak current ripple (~30% of IOUT), thermal rise, and transient response. The LT8606BHDC#TRMPBF's 35ns minimum on-time allows stable 2MHz switching even at high VIN/VOUT ratios - verified in Figure G17 of the datasheet, which shows <±0.5% fSW variation from –40°C to +125°C.
Can LT8606BHDC#TRMPBF be used without an external RT resistor?
No - LT8606BHDC#TRMPBF requires an RT resistor connected from the RT pin to GND to set switching frequency. Without it, the oscillator remains unconfigured and regulation fails. The datasheet specifies RT values from 16.2kΩ (2.2MHz) to 221kΩ (200kHz); omitting RT results in undefined behavior. Unlike some regulators with internal default frequencies, LT8606BHDC#TRMPBF has no internal oscillator bias - RT is mandatory for all operating modes.
LT8606BHDC#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT8606BHDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8606BHDC#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT8606BHDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8606BHDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8606BHDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8606BHDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8606BHDC#TRMPBF?
LT8606BHDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8606BHDC#TRMPBF 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#TRMPBF?
For technical support, including LT8606BHDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8606BHDC#TRMPBF requirements.
6.How does Aetrix verify that LT8606BHDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8606BHDC#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8606BHDC#TRMPBF?
All LT8606BHDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8606BHDC#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT8606BHDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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