LT8609B Datasheet

Part No.	In Stock	Price	Packaging	SPQ	Marking	MSL	Pins	Temp Range	Package Description
LT8609BEMSE#PBF	390pcs	-	Tube	50	LTGZY		10	-40°C ~ 125°C	10-Lead MSOP
LT8609BEMSE#TRPBF	0	-	Reel	2500	LTGZY		10	-40°C ~ 125°C	10-Lead MSOP
LT8609BIMSE#PBF	19pcs	-	Tube	50	LTGZY		10	-40°C ~ 125°C	10-Lead MSOP
LT8609BIMSE#TRPBF	0	-	Reel	2500	LTGZY		10	-40°C ~ 125°C	10-Lead MSOP

• Wide Input Voltage Range: 3.0V to 42V
• Ultralow Quiescent Current Burst Mode^® Operation:
  • <2.5µA I_Q Regulating 12V_IN to 3.3V_OUT
  • Output Ripple <10mV_P-P
• High Efficiency 2MHz Synchronous Operation:
  • >93% Efficiency at 1A, 5V_OUT from 12V_IN
• 3A Maximum Continuous Output
• Fast Minimum Switch-On Time: 45ns
• LT8609A Available in Fixed 3.3V and 5V Output
• Adjustable and Synchronizable: 200kHz to 2.2MHz
• Spread Spectrum Frequency Modulation for Low EMI
• Allows Use of Small Inductors
• Low Dropout
• Peak Current Mode Operation
• Accurate 1V Enable Pin Threshold
• Internal Compensation
• Output Soft-Start and Tracking
• Small 10-Lead MSOP Package, 16-Lead MSOP Package, or 10-Lead 3mm × 3mm DFN Package with Side Wettable Flanks
• AEC-Q100 Qualified for Automotive Applications

• GSM Transceivers
• General Purpose Step-Down
• Low EMI Step-Down

The LT8609B is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of nonswitching quiescent current. The LT8609B can deliver 3A of continuous current. Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV_P-P. A SYNC pin allows synchronization to an external clock, or spread spectrum modulation for low EMI operation. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program V_IN UVLO or to shut down the part. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up while the PG flag signals when V_OUT is within ±8.5% on the adjustable output parts or ±7.5% on the fixed output parts of the programmed output voltage as well as fault conditions. The LT8609B operates in pulse-skipping mode only.