PM6680 Datasheet | STMicroelectronics

No Rsense dual step-down controller with adjustable voltages for notebook system power Features - 6 V to 28 V input voltage range output voltages 5V always voltage available deliver 100 m A peak current 1.237 V ± 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 (33 k Hz) in pulse skip mode 4m W maximum quiescent power Independent power good signals Output voltage ripple pensation VFQFPN-32 5X5 .. - Adjustable - - - - - - - - - - - - Description PM6680 is a dual step-down controller specifically designed to provide extremely high efficiency conversion, with lossless 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 pensates the DC voltage error due to the output ripple. Pulse skipping technique increases efficiency at very light load. Moreover a minimum switching frequency of 33k Hz is selectable to avoid audio noise issues. The PM6680 provides a selectable switching frequency, allowing three different values of switching frequencies for the two switching sections. The output voltages OUT1 and OUT2 can be adjusted from 0.9 V to 5.5 V and from 0.9 V to 3.3 V respectively. Applications - - - - Notebook puters Tablet PC or slates Mobile system power supply 3-4 cells Li+ battery powered devices Table 1. Device summary Order codes PM6680 PM6680TR Package VFQFPN-32 5mm x 5mm (Exposed pad) VFQFPN-32 5mm x 5mm (Exposed pad) Packaging Tube Tape and reel August 2007 Rev 6 1/49 .st. 49 Contents Contents 1 2 Simplified application schematic - - - - - - . 4 Electrical...