LT8697 Series

USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation

Catalog

USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation

Part	Package / Case	Applications	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Input [Max]	Voltage - Input [Min]	Voltage - Output [Max]	Voltage - Output [Min]	Supplier Device Package	Number of Outputs	Mounting Type	Voltage - Output
Analog Devices LT8697EUDD#TRPBF	24-WFQFN Exposed Pad	Converter USB	125 °C	-40 °C	42 V	5 V	5.25 V	5 VDC	24-QFN (3x5)	1	Surface Mount
Analog Devices LT8697IUDD	24-WFQFN Exposed Pad	Converter USB	125 °C	-40 °C	42 V	5 V			24-QFN (3x5)	1	Surface Mount	Adjustable
Analog Devices LT8697EUDD#PBF	24-WFQFN Exposed Pad	Converter USB	125 °C	-40 °C	42 V	5 V	5.25 V	5 VDC	24-QFN (3x5)	1	Surface Mount

Catalog

USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation

Key Features

• Wide Input Range: 5V to 42V

• Low Dropout Under All Conditions: 450mV at 2.1A

• Accurate 5V Output: ±1.3% Over Full TemperatureRange

• Programmable Cable Drop Compensation

• Programmable Output Current Limit

• Output Current Monitor

• Dual Input Feedback Permits Regulation on Outputof USB Switch

• Forced Continuous Mode for Fast Load StepResponse

• High Efficiency Synchronous Operation at 2MHz:93% Efficiency at 2.1A, 5VOUTfrom 12VIN95% Efficiency at 0.9A, 5VOUTfrom 12VIN

• 93% Efficiency at 2.1A, 5VOUTfrom 12VIN

• 95% Efficiency at 0.9A, 5VOUTfrom 12VIN

• Fast Minimum Switch-On Time: 45ns

• Adjustable Output from 5.0V to 5.25V

• Adjustable and Synchronizable: 300kHz to 2.2MHz

• Small Thermally Enhanced 3mm × 5mm 24-LeadQFN Package

Description

The LT8697 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. Forced continuous operation allows the LT8697 to sink current, further enhancing accurate 5V regulation during load transients.Accurate and programmable output current limit, a power good indicator pin and an output current monitor pin improve system reliability and safety, allow the user to implement latch-off or auto-retry functionality and can eliminate the need for a USB switch IC. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 5.8V output, protecting USB devices during fault conditions. Thermal shutdown provides additional protection by limiting power dissipation in the IC during an overtemperature fault.The LT8697 is available in a small 24-lead 3mm × 5mm package with an exposed pad for low thermal resistance.ApplicationsAutomotive and Industrial USBPrecision 5V Supply