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L6728 Scheda tecnica(PDF) 1 Page - STMicroelectronics |
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L6728 Scheda tecnica(HTML) 1 Page - STMicroelectronics |
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1 / 31 page  June 2008 Rev 3 1/31 1 L6728 Single phase PWM controller with Power Good Features ■ Flexible power supply from 5 V to 12 V ■ Power conversion input as low as 1.5 V ■ 0.8 V internal reference ■ 0.8 % output voltage accuracy ■ High-current integrated drivers ■ Power Good output ■ Sensorless and programmable OCP across low-side RDS(on) ■ OV / UV protections ■ VSEN disconnection protection ■ Oscillator internally fixed at 300 kHz ■ LSless to manage pre-bias start-up ■ Adjustable output voltage ■ Disable function ■ Internal soft-start ■ DFN10 package Applications ■ Memory and termination supply ■ Subsystem power supply (MCH, IOCH, PCI...) ■ CPU and DSP power supply ■ Distributed power supply ■ General DC-DC converters Description L6728 is a single-phase step-down controller with integrated high-current drivers that provides complete control logic and protection to realize in a simple way general DC-DC converters by using a compact DFN10 package. Device flexibility allows managing conversions with power input VIN as low as 1.5 V and device supply voltage ranging from 5 V to 12 V. L6728 provides simple control loop with voltage mode EA. The integrated 0.8 V reference allows regulating output voltages with ±0.8 % accuracy over line and temperature variations. Oscillator is internally fixed to 300 kHz. L6728 provides programmable dual level over current protection as well as over and under voltage protection. Current information is monitored across the low-side MOSFET RDS(on) saving the use of expensive and space- consuming sense resistors. PGOOD output easily provides real-time information on output voltage status, through VSEN dedicated output monitor. DFN10 Table 1. Device summary Order codes Package Packaging L6728 DFN10 Tube L6728TR Tape and reel www.st.com |
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