LT8625S Series

18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference

Catalog

18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference

Part	Output Configuration	Package / Case	Mounting Type	Voltage - Input (Min) [Min]	Topology	Voltage - Input (Max) [Max]	Function	Supplier Device Package	Current - Output	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Synchronous Rectifier	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output	Utilized IC / Part	Supplied Contents	Main Purpose	Voltage - Input [Max]	Voltage - Input [Min]	Regulator Topology	Board Type	Outputs and Type	Outputs and Type
Analog Devices LT8625SIV#TRMPBF	Positive	20-TFQFN Exposed Pad	Surface Mount	2.7 V	Buck	18 V	Step-Down	20-LQFN (4x3)	8 A	125 °C	-40 °C	1		4 MHz	300 kHz
Analog Devices DC3219A									8 A							1 V	LT8625S	Board(s)	DC/DC Step Down	18 V	2.7 V	Buck	Fully Populated	Non-Isolated	1

Catalog

18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference

Key Features

• Silent Switcher®3 ArchitectureUltralow RMS Noise (10Hz to 100kHz): 4μVRMSUltralow Spot Noise: 4nV/√Hzat 10kHzUltralow EMI Emissions on Any PCBInternal Bypass Capacitors Reduce Radiated EMI

• Ultralow RMS Noise (10Hz to 100kHz): 4μVRMS

• Ultralow Spot Noise: 4nV/√Hzat 10kHz

• Ultralow EMI Emissions on Any PCB

• Internal Bypass Capacitors Reduce Radiated EMI

• High Efficiency at High Frequency

• Ultrafast Transient Response: 1μs

• Fast Minimum Switch On-Time: 15ns

• Input Voltage Range: 2.7V to 18V

• Output Voltage Range: 0V to (PVIN− 0.5V)

• 8A Maximum Continuous Output Current

• Precision Reference: ±0.8% OverTemperature with Remote Sense

• Supports Dynamic Output Voltage Control

• PolyPhase®Operation: Up to 12 Phases

• Forced Continuous Mode Capability

• Adjustable and Synchronizable: 300kHz to 4MHz

• Programmable Power Good

• Small 20-Lead 4mm × 3mm LQFN Package

Description

The LT8625S synchronous step-down regulator features third-generation Silent Switcher technology which is uniquely designed to combine an ultralow noise reference with Silent Switcher architecture in order to achieve both high efficiency and excellent wideband noise performance.The innovative ultralow noise architecture provides exceptional low frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage.Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies.The LT8625S is ideal for high current, noise sensitive applications which benefit from the high efficiency of a synchronous switching regulator.ApplicationsRF Power Suppliers: PLLs, VCOs, Mixers, LNAs, PAsHigh Speed/High Precision ADCs/DACsLow Noise Instrumentation