O2電源管理芯片資料

　　OZ8026LC/OZ8029LC/OZ80216LC is a low operating current family of DC/DC regulators， providing power control for the peripherals and chipsets. OZ8026LC/OZ8029LC/OZ80216LC controllers step down the battery/supply voltage to low output voltages in the range of 0.5V to 3.4V. High efficiency， scalability， DC accuracy and excellent transient response make this family of regulators the perfect choice for supplying low voltage CPU peripherals， chipset cores， and graphics processors. Voltage Feed-Forward compensation assures high rejection of input voltage transients typically occurring when the AC adapter is plugged in or removed. Over Voltage Protection （OVP） acts when the output voltage exceeds the set voltage by more than 150mV. This protection condition is latched and leaves output voltage to decay under the influence of the load. Under Voltage Protection （UVP） acts when the output voltage falls below the set voltage by more than 150mV. This protection condition is latched and leaves output voltage to decay under the influence of the load. After OVP or UVP are triggered， the ONS signal must be toggled or VDD/VDC cycled to restart the regulator. The output is protected against overload by valley current type， cycle-by-cycle Over Current Protection （OCP） circuits. During start-up， Over Current Timeout （OCT） Protection prevents the circuit from operating for more than 1ms at OCP threshold level into a shorted load. The Under Voltage Lock Out circuit monitors both VDD and VDC rails and allows controller operation only if VDD 》 4.3V and VDC 》 2.5V （typical values）。 The Power Good signal is high as long as the output voltage is within +150mV/-150mV of the set voltage. At startup the output voltage ramps up with a slew rate of 11mV/μs （typical value）。 If any protection is triggered， both power MOSFETs will be turned OFF， leaving LX in high impedance and VFB is pulled down by an internal resistive switch.