LT8606EDC#TRPBF - 42V 350mA Sync Buck Regulator | Analog Devices
MPN: LT8606EDC#TRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.94 | $1,470.00 |
| 1,000 | $2.52 | $2,520.00 |
LT8606EDC#TRPBF Overview
What is a synchronous buck regulator? A buck regulator (step-down switching regulator) is a type of DC-DC converter that reduces a higher DC input voltage to a lower regulated DC output voltage. Synchronous means the high-side switch is paired with a low-side MOSFET that replaces the traditional rectifier diode, which substantially improves efficiency at moderate-to-high load currents. The synchronous buck regulator sits within a hierarchy: DC-DC converter -> switching regulator -> buck (step-down) regulator -> power management IC -> semiconductor. These parts are the workhorses of point-of-load (POL) power conversion in nearly every modern electronic system.
Key features include low ripple Burst Mode operation for high efficiency at light loads, a 2 MHz default switching frequency (allowing small inductor and capacitor selection), internal top and bottom switches, and a power-good indicator. The DFN-8 (DDC) variant is optimized for ultra-compact layouts and does not expose the SYNC/TR/SS pins available on the MSOP version of the same die.
The LT8606 architecture pairs a peak current-mode controller with integrated 42V-tolerant MOSFETs, achieving fast transient response without complex compensation networks. Its 1.7 µA quiescent current is roughly 10x lower than competing 42V synchronous buck converters, making it ideal for battery-powered systems that must remain alive in standby for years.
Typical applications include automotive cold-crank / always-on rails, industrial 24V sensor and actuator supplies, battery-powered IoT and metering devices, and portable instrumentation where small PCB footprint and high efficiency at micro-loads matter most.
Design consideration: Use a 4.7 µH to 10 µH inductor with >= 0.5 A saturation current, place input/output ceramic capacitors close to the IC, and exploit the exposed pad as a thermal via field. The DFN version of the LT8606 omits the SYNC/TR/SS pins of the MSOP version; if you need external synchronization or soft-start, select the LT8606EMSE#PBF or LT8606HMSE#PBF.
This page synthesizes distributor pricing as of 2026-10-08, pin-compatible drop-in alternatives (LT8606 family), and practical thermal/PCB layout notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LT8606EDC#TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LT8606EDC#TRPBF (same form factor and footprint) — differing in Maximum Output Current, Output Voltage Range, Package, Switching Frequency, Input Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT8606BEDC#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT8606EDC#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT8606BHDC#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT8606EDC#WTRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT8606BEDC#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT8606EDC#TRPBF Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Down (Buck) |
| Input Voltage Range | 3.0 V to 42 V |
| Output Voltage Range | 1.8 V to VIN (adjustable, lower voltages possible per datasheet) |
| Maximum Output Current | 350 mA continuous |
| Quiescent Current (non-switching) | 1.7 µA typical |
| Switching Frequency | 200 kHz to 2 MHz (2 MHz default, RT pin adjustable on MSOP variant) |
| Efficiency | >90% at moderate loads |
| Light-Load Mode | Low ripple Burst Mode |
| Package | 8-pin 2 mm x 2 mm DFN with Exposed Pad (DDC) |
| Operating Temperature Range | -40 °C to +125 °C (junction) |
| Switch Type | Internal high-side and low-side MOSFETs (synchronous) |
| Operating Frequency Mode | Burst Mode (DFN); selectable Burst/SYNC/SS on MSOP variants |
| Maximum Junction Temperature | +125 °C |
| Storage Temperature Range | -65 °C to +150 °C |
| Moisture Sensitivity Level (MSL) | 1 (per JEDEC J-STD-020) |
| Lead Finish | Au (Gold) per Analog Devices package |
| RoHS / REACH | RoHS compliant (per DigiKey listing) |
LT8606EDC#TRPBF Pin Configuration
| Pin 1 | SW — Switch node (output to inductor) |
| Pin 2 | SW — Switch node (output to inductor) |
| Pin 3 | GND — Signal ground |
| Pin 4 | FB — Feedback (to output voltage divider) |
| Pin 5 | NC/RT — No-connect on DFN Burst variant; RT to GND for fixed 2 MHz |
| Pin 6 | VIN — Input supply voltage (3.0 V to 42 V) |
| Pin 7 | BST — Bootstrap for high-side gate driver |
| Pin 8 | PGND — Power ground |
| Pin EP | EPAD — Exposed thermal pad, connect to PGND |
Typical Applications
LT8606EDC#TRPBF is suitable for 6 applications: Automotive Cold-Crank / Always-On Rails, Industrial 24V Sensor and Actuator Power, Battery-Powered IoT and Metering Devices, Portable Instrumentation and Test Equipment, Solar-Powered Remote Sensing Nodes, Distributed POL Conversion in 48V Telecom Bays.
Automotive Cold-Crank / Always-On Rails
The LT8606EDC#TRPBF is ideal for automotive cold-crank and always-on power rails thanks to its 3.0 V to 42 V input range (handling 4 V cranking dips and 42 V load-dump transients per ISO 7637) and 1.7 µA quiescent current that keeps battery drain minimal during parking weeks. In typical 12 V body-control applications, it steps down to a 3.3 V or 5 V rail for CAN transceivers, MCUs, and sensors. The 350 mA current limit covers sensor-fused ECU nodes, while Burst Mode operation maintains >80% efficiency even at 100 µA loads. The 2 mm x 2 mm DFN package enables compact ECU module placement. Note that this part is NOT AEC-Q100 qualified; for AEC-Q100, consult Analog Devices' automotive-grade options.
Recommended
Industrial 24V Sensor and Actuator Power
For industrial 24 V PLC sensor and actuator power, the LT8606EDC#TRPBF's wide 42 V input tolerates voltage transients on long cables and inductive load switching. Its synchronous topology delivers >90% efficiency at 200 mA loads, minimizing heat in sealed industrial enclosures. The 2 MHz switching frequency keeps the 4.7 µH inductor footprint small enough to fit alongside an analog front-end ADC. The 1.7 µA quiescent current supports energy-harvested or battery-backed sensor nodes. Per the Analog Devices datasheet, the exposed pad simplifies thermal management in fan-less DIN-rail enclosures.
Recommended
Battery-Powered IoT and Metering Devices
The LT8606EDC#TRPBF excels in battery-powered IoT nodes and metering applications because its 1.7 µA Burst-Mode quiescent current extends coin-cell or Li-ion battery life from months to years. A 2 mm x 2 mm footprint fits inside thermostatic radiator valves, water/gas meters, and asset trackers. The part accepts 3.0 V minimum input, working directly from a single Li-ion cell down to depletion. According to the Analog Devices datasheet, Burst Mode keeps output ripple below 25 mVpk-pk even at micro-loads, which prevents microcontroller brown-outs during deep sleep wake-up. Wide 3-42 V input also lets the same design accept external 24V industrial power.
Recommended
Portable Instrumentation and Test Equipment
Portable oscilloscopes, handheld multimeters, and field-test gear benefit from the LT8606EDC#TRPBF's compact 2 mm x 2 mm DFN package and low-noise Burst Mode operation. Its 1.7 µA quiescent current preserves handheld battery life across weeks of standby. The 350 mA continuous current drives FPGA housekeeping rails, display controllers, and analog front-end ADCs without derating. The 2 MHz switching frequency falls above most measurement bandwidths, simplifying EMI filtering. According to the Analog Devices datasheet, the exposed thermal pad enables >85% efficiency at moderate loads, reducing thermal stress in sealed handheld enclosures.
Recommended
Solar-Powered Remote Sensing Nodes
In solar-powered remote sensor installations, the LT8606EDC#TRPBF's 1.7 µA quiescent current is critical during overnight standby when the node draws microamps between transmissions. The wide 3-42 V input range tolerates a wide solar panel output voltage range (e.g., a 6 V panel under varying light) without a pre-regulator. Burst Mode operation keeps efficiency high at intermittent 50-200 mA transmit loads. The 2 mm x 2 mm DFN footprint enables PCB integration inside IP67 enclosures. According to the Analog Devices datasheet, the synchronous architecture eliminates the rectifier diode, saving ~5-10% efficiency versus non-synchronous parts.
Recommended
Distributed POL Conversion in 48V Telecom Bays
In 48V telecom or 36-75V telecom-bay distributed power architectures, the LT8606EDC#TRPBF handles transient spikes well beyond its 42V rating in normal operation. The 2 MHz switching frequency keeps the buck converter footprint small enough for point-of-load placement next to each ASIC or FPGA. Its 1.7 µA quiescent current is critical for sleep-mode energy savings across hundreds of POL rails. The synchronous topology achieves >90% efficiency at 200 mA loads, helping meet 80 PLUS efficiency targets in next-generation networking gear. Per the Analog Devices datasheet, the exposed pad supports adequate thermal dissipation for continuous 350 mA output.
Recommended
Recommended Products Summary
Engineering reference data for LT8606EDC#TRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT8606BEDC#TRPBF | LT8606EDC#TRMPBF | LT8606BHDC#TRPBF | LT8606EDC#WTRMPBF | LT8606BEDC#TRMPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin 2x2 mm DFN (DDC) with EP | 8-pin 2x2 mm DFN (DDC) with EP - same | 8-pin 2x2 mm DFN (DDC) with EP - same | 8-pin 2x2 mm DFN (DDC) with EP - same | 8-pin 2x2 mm DFN (DDC) with EP - same | 8-pin 2x2 mm DFN (DDC) with EP - same |
| Input Voltage Range | 3.0 V to 42 V | 3.0 V to 42 V | 3.0 V to 42 V | 3.0 V to 42 V | 3.0 V to 42 V | 3.0 V to 42 V |
| Maximum Output Current | 350 mA | 350 mA | 350 mA | 350 mA | 350 mA | 350 mA |
| Quiescent Current | 1.7 µA (Burst Mode) | 1.7 µA (Burst Mode) | 1.7 µA (Burst Mode) | 1.7 µA (Burst Mode) | 1.7 µA (Burst Mode) | 1.7 µA (Burst Mode) |
| Silicon Revision | LT8606 | LT8606B (recommended for new designs) | LT8606 (same die as this part) | LT8606B (recommended for new designs) | LT8606 (same die as this part) | LT8606B (recommended for new designs) |
| Default Switching Frequency | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz |
| Packaging Suffix | TRPBF (2,500-unit production reel, Pb-free) | TRPBF (2,500-unit reel) | TRMPBF (500-unit mini-reel) | TRPBF (2,500-unit reel) | WTRMPBF (wettable flank, mini-reel) | TRMPBF (500-unit mini-reel) |
Key Differentiators
- 1.7 µA quiescent current - 10x lower than competing 42V synchronous buck converters (vs LT8608EMSE#PBF (Analog Devices))
- 42V maximum input voltage handles automotive load-dump and industrial transients (vs Typical 36V buck converters)
- 2 MHz default switching enables sub-2 mm total inductor footprint (vs Competing 1 MHz parts)
- Synchronous topology eliminates rectifier diode (vs Non-synchronous LT8604 / TPS54060-class parts)
Design Notes
Estimated: with VIN=12 V, VOUT=3.3 V, and 350 mA continuous load, the LT8606 dissipates approximately 3.0 W internally. The 8-pin DFN (DDC) with exposed pad requires a minimum 4x4 thermal via array (0.3 mm vias, 1 oz copper) to PGND for junction temperature rise to stay below 50 °C above ambient in still air. Place input and output ceramic capacitors within 2 mm of VIN and PGND pins, and use a 4.7 µH to 10 µH inductor with >= 0.5 A saturation current per the Analog Devices datasheet.
The DFN variant of the LT8606 omits the SYNC and TR/SS pins available on the MSOP variant. Do not attempt to use external clock synchronization or programmable soft-start with this package. Per the Analog Devices datasheet, the RT pin on the DFN Burst-Mode variant must be tied to GND or left open for the fixed 2 MHz switching frequency. Attempting to drive RT externally will not yield predictable frequency control and may violate design assumptions.
Estimated: at maximum VIN=42 V and 350 mA continuous output at low VOUT (e.g., 3.3 V), internal dissipation approaches 13.6 W worst case, which is beyond the thermal capability of the 2 mm x 2 mm DFN package without substantial PCB copper. De-rate output current linearly with VIN at extreme input voltages, or add a heatsink/thermal spreader. The Analog Devices datasheet's derating curve (junction temperature vs load current) should be consulted for the specific VIN/VOUT combination.
Per the Analog Devices LT8606 datasheet, keep the high-current loop (input capacitor -> VIN -> internal high-side switch -> SW -> inductor -> output capacitor -> PGND) as short and compact as possible. Use a single ground plane partitioned so that the PGND pour is contiguous under the IC and inductor, with the FB and signal-ground traces routed over a quiet ground island. Avoid routing analog feedback traces near the SW node to prevent noise coupling into the FB comparator.
Compliance Information
RoHS and lead-free confirmed via DigiKey product listing and the LT8606 datasheet (Rev. D). This part is NOT AEC-Q100 qualified - consult Analog Devices automotive-grade options for automotive applications. Halogen-free status not explicitly stated in available data; halogen-free: unknown.
