Description
The CS8127 contains all the necessary control circuitry to implement a 5V linear regulator. An external pass device is used to produce superior performance compared to conventional monolithic regulators. The CS8127 with a TIP42 PNP transistor typically provides a 100mV dropout voltage at 500mA, increasing to 350mV at 3A. Quiescent current at 500mA is only 5mA.
Monolithic regulators cannot approach these figures because their power transistors do not provide the high beta and excellent saturation characteristics at high currents. The CS8127 is compatible with a wide variety of external transis tors, allowing flexibility for thermal, space, and cost management.
The CS8127 includes thermal shutdown, externally programmable current limit, and over-voltage shutdown, making it suitable for use in automotive and switching regulator post regulator applications. An optional external RC filter added to the CS8127 supply lead provides EMC hardening in addition to the on-chip EMC hardening. The SENSE lead allows remote sensing of the output voltage for improved regulation.

Features
■ Externally Set Delay for Reset
■ 60V Peak Transient Capability
■ Internal Thermal Overload Protection
■ 3% Output Accuracy
■ Active RESET
■ Noise Immunity
■ On Chip EMC Hardening Protection Incorporated
■ Externally Set Current Limit