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L6728ATR Fiches technique(PDF) 1 Page - STMicroelectronics |
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L6728ATR Fiches technique(HTML) 1 Page - STMicroelectronics |
1 / 32 page October 2008 Rev 1 1/32 1 L6728A High frequency 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 600 kHz ■ LS-LESS to manage pre-bias start-up ■ Adjustable output voltage ■ Disable function ■ Internal soft-start ■ VFDFPN 10 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 L6728A 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 VFDFPN 10 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. L6728A 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 600 kHz. L6728A 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. VFQFPN 10 Table 1. Device summary Order codes Package Packing L6728A VFDFPN 10 Tube L6728ATR VFDFPN 10 Tape and reel www.st.com |
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