RE023

RE023 is a Low Drop Out (LDO) voltage regulator macrocell with a fixed 2.6V outputvoltage, rated for loads up to 160 mA. It is designed to be integrated with other analogcells, digital logic, microcontrollers, DSP cores and memory blocks into system-on-chip products.

The circuit RE023 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 of RE023 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 (bandgap voltage) RE023 is necessary for correct functionality.The target reference voltage is 1.231V, delivered, for example, by BG019. Doublepads on the supply voltage VBAT2B/VBAT2BB and output voltage VANINTA/VANINTAA areused to reduce the total output resistance. Currentreference of RE023 is generated inside thecell through a circuit supplied by a 2.5V ± 0.1V regulated input voltage on VSAUVC.

Remote sense terminal VANINTS RE023 provides regulation at the load by connecting it to theoutput terminal near a critical point to improve performance of the regulator (e.g., con-necting them at the package pin by double-bonding, thus RE023 is avoiding the bondingresistance influence). A ceramic capacitor of 2.2 µF connected from VANINTA/VANINTAAto ground is needed as external compensation.