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L6739：Single-phase PWM controller with light-load efficiency optimization

The L6739 is a single-phase step-down controller with integrated high current drivers that provides complete control logic and protection to realize a DC-DC converter.

The device flexibility allows to manage conversions with power input V_INas low as 1.5 V and the device supply voltage ranging from 5 V to 12 V bus.

The L6739 device features a proprietary algorithm that allows light-load efficiency optimization, boosting efficiency without compromising the output voltage ripple.

The integrated 0.8 V reference allows generation of output voltages with ± 0.5% accuracy over line and temperature variations.

The oscillator is programmable up to 600 kHz.

The L6739 device provides a programmable overcurrent protection and overvoltage protection. The current information is monitored across the inductor DCR.

The L6739 is available in a VFQFPN 16 3 x 3 mm package.

Key Features

• Flexible power supply from 5 V to 12 V bus
• Power conversion input as low as 1.5 V
• Light-load efficiency optimization
• Embedded bootstrap switch
• VIN detector
• 0.8 V internal reference
• 0.5% output voltage accuracy
• Remote GND recovery
• High current integrated drivers
• Sensorless and programmable precise-OC sense across inductor DCR
• OV protection
• Overtemperature protection
• Programmable oscillator up to 600 kHz
• LS-less to manage pre-bias startup
• Adjustable output voltage
• Disable function
• Internal soft-start
• VFQFPN 16 3 x 3 mm package

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