CS8128 Datasheet | Cherry Semiconductor Corporation

Description The CS8128 contains all the necessary control circuitry to implement a 5V linear regulator. An external pass device is used to produce superior performance pared to conventional monolithic regulators. The CS8128 with a TIP42 PNP transistor typically provides a 100m V dropout voltage at 500m A, increasing to 350m V at 3A. Quiescent current at 500m A is only 5m A. Monolithic regulators cannot approach these figures because their power transistors do not provide the high beta and excellent saturation characteristics at high currents. The CS8128 is patible with a wide variety of external transistors, allowing flexibility for thermal, space, and cost management. The CS8128 includes thermal shutdown and 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 CS8128 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. An active microprocessor RESET function is included on-chip with externally programmable delay time. During power-up, or after detection of any error in the regulated output, the RESET lead will remain in the low state for the duration of the delay. Types of errors include short circuit, low input voltage, overvoltage shutdown, thermal shutdown, or others that cause the output to bee unregulated. This function is independent of the input voltage and will function correctly with an output voltage as low as 1V. Hysteresis is included in both the reset and delay parators for noise immunity and to prevent oscillations. A latching discharge circuit is used to discharge the delay capacitor, even when triggered by a relatively short fault condition. This circuit improves upon the monly used SCR structure by providing improved noise immunity and full capacitor discharge (0.2V typ). Features s Externally Set...