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PM6685 Datasheet(PDF) 1 Page - STMicroelectronics |
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PM6685 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 52 page  October 2007 Rev 7 1/52 52 PM6685 Dual step-down main supply controller with auxilary voltages for notebook system power Features ■ 6V to 28V input voltage range ■ Fixed 5V - 3.3V output voltages ■ 5V and 3.3V voltage always available to deliver 100mA of peak current ■ 1.237V ±1% reference voltage available ■ Lossless current sensing using low side ■ MOSFETs' RDS(on) ■ Negative current limit ■ Soft-start internally fixed at 2ms ■ Soft output discharge ■ Latched OVP and UVP ■ Selectable pulse skipping at light loads ■ Selectable minimum frequency (33kHz) in pulse skip mode ■ 4mW maximum quiescent power ■ Independent power good signals ■ Output voltage ripple compensation Applications ■ Notebook computers ■ Tablet PC or slates ■ Mobile system power supply ■ 3 and -4 Cells Li+ battery-powered devices Description PM6685 is a dual step-down controller specifically designed to provide extremely high efficiency conversion with loss-less current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. An embedded integrator control loop compensates the DC voltage error due to the output ripple. The pulse skipping technique increases efficiency for very light loads. Moreover, a minimum switching frequency of 33kHz is selectable in order to avoid audio noise issues. The PM6685 provides a selectable switching frequency, allowing either 200kHz/300kHz, 300kHz/400kHz, or 400kHz/500kHz operation of the 5V/3.3V switching sections. VFQFPN-32 (5mm x 5mm) Table 1. Device summary Order code Package Packaging PM6685 VFQFPN-32 (5mm x 5mm) Tube PM6685TR VFQFPN-32 (5mm x 5mm) Tape and Reel www.st.com |
Similar Part No. - PM6685_07 |
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Similar Description - PM6685_07 |
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