ISL97522

ISL97522 4-Channel TFT-LCD Supply RECOMMOEBNSDOELDEISTLRE9E8PP6RL0AO2CDEUMCETNT PART DATASHEET FN7445 Rev 0.00 December 13, 2006 The ISL97522 represents a 4-channel supply control IC for use in large panel TFT-LCD displays. Supporting inputs from 4.5V to 13V, the ISL97522 includes a boost controller to achieve the required AVDD output voltage. Both VON and VOFF are generated using off-chip charge-pumps which are then post regulated using on-board LDO controllers. The logic supply is generated using an internal nonsynchronous buck controller. This controller runs at 180° out of phase with the AVDD supply to minimize input noise. The AVDD, VOFF, and VON outputs are automatically sequenced as AVDD, VOFF, and VON. By using an optional external series transistor with AVDD (Q1), the start-up sequence can be adjusted to VOFF, AVDD and then VON. A VON slicing circuit is also included to reduce LCD flicker. The ISL97522 also incorporates a fault protection circuit that can disable the IC an...