RE030

RE030 is a dual mode Low Drop Out (LDO) voltage regulator macrocell with program-mable output voltage ranging from 1.75V to 2.1V, rated for loads up to 180 mA in fullpower mode and 5 mA in low power mode. (Both modes can be selected by the LP9signal.) RE030 is designed to be integrated with other analog cells, digital logic, microcon-trollers, DSP cores and memory blocks into system-on-chip products.

The circuit RE030 consists of a PMOS pass device, an error amplifier and a feedback resis-tive network, sized to achieve the required closed loop gain. These blocks ofRE030 make upthe regulating loop. An over-current and short circuit protection circuit has beenincluded to limit the output current delivered by the regulator, thus avoiding destructionin case of a short circuit.

An external reference voltage VBG (bandgap voltage) RE030 is necessary for correct function-ality. The target reference voltage is 1.231V delivered, for example, by BG019. Doublepads on the supply voltage VBAT1A/VBAT1AA and output voltage VCOREA/VCOREAA areused to reduce the total output resistance. Current reference of RE030 is generated inside thecell through a circuit supplied by a 2.5V ± 0.1V of regulated input voltage on VSAUVC.

Remote sense terminal VCORES provides regulation of the load by connecting RE030 to theoutput terminal near a critical point to improve performance of the regulator (e.g., con-necting RE030 to the package pin by double-bonding, thus avoiding the bonding resistanceinfluence). A ceramic capacitor of 2.2 µF connected from VCOREA/VCOREAA to ground isneeded as external compensation.