L6739TR STMicroelectronics

L6739 Single-phase PWM controller with light-load efficiency optimization Datasheet - production data Applications Memory and termination supply Subsystem power supply (MCH, IOCH, PCI) CPU and DSP power supply Distributed power supply General DC-DC converter VFQFPN16 Description The L6739 is a single-phase step-down controller with integrated high current drivers that provides complete control logic and protection to realize Features a DC-DC converter. Flexible power supply from 5 V to 12 V bus The device flexibility allows to manage Power conversion input as low as 1.5 V conversions with power input V as low as 1.5 V IN and the device supply voltage ranging from 5 V to Light-load efficiency optimization 12 V bus. Embedded bootstrap switch The L6739 device features a proprietary algorithm VIN detector that allows light-load efficiency optimization, 0.8 V internal reference boosting efficiency without compromising the 0.5% output voltage accuracy output voltage ripple. Remote GND recovery The integrated 0.8 V reference allows generation of output voltages with 0.5% accuracy over line High current integrated drivers and temperature variations. Sensorless and programmable precise-OC sense across inductor DCR The oscillator is programmable up to 600 kHz. OV protection The L6739 provides a programmable overcurrent protection and overvoltage protection. The current Overtemperature protection information is monitored across the inductor DCR. Programmable oscillator up to 600 kHz The L6739 device is available in a VFQFPN 16 - LS-less to manage pre-bias startup 3 x 3 mm package. Adjustable output voltage Disable function Table 1. Device summary Internal soft-start Order code Package Packing VFQFPN 16 - 3 x 3 mm package L6739TR VFQFPN16 Tape and reel May 2014 DocID026384 Rev 1 1/30 This is information on a product in full production. www.st.comContents L6739 Contents 1 Typical application circuit and block diagram 4 1.1 Application circuit 4 1.2 Block diagram . 5 2 Connection diagram and pin description 6 2.1 Pin description 6 2.2 Thermal data . 7 3 Electrical specifications 8 3.1 Absolute maximum ratings . 8 3.2 Electrical characteristics . 9 4 Device description and operation . 11 5 Soft-start 12 LS-less startup . 12 6 Output voltage setting and protections 13 Overcurrent 14 Overcurrent threshold setting . 15 7 Main oscillator . 16 8 High current embedded drivers . 17 8.1 Boot capacitor design 17 8.2 Power dissipation . 18 9 Application details . 19 9.1 Compensation network . 19 9.2 Layout guidelines . 21 2/30 DocID026384 Rev 1