RAA212831 Datasheet | Renesas

4.5V to 72V Input, 0.5A Buck Regulator with Two Linear Regulator Outputs The RAA212831 is a triple output regulator bining a 4.5V to 72V input, 0.5A buck regulator with two LDO outputs. The buck regulator has a fixed switching frequency of 350k Hz in Continuous Conduction mode (CCM) and operates in pulse skipping mode at lighter loads when it enters Discontinuous Conduction mode (DCM). The two LDOs operate from a 12V (or lower) input voltage. The LDOs are rated at 100m A and 50m A of output current. The buck regulator output can be set from 1.25V to VIN×Dmax. The LDOs can support an input voltage range of 6V to 12V and the output voltages are fixed at 3.3V and 5V. The IC is designed to provide a pact, highly integrated power management solution. Its integrated buck regulator and LDO outputs minimize system ponent count. The buck converter uses peak current mode control, providing 500m A current for load and downstream LDO regulators, while the LDOs provide 5V and 3.3V regulated outputs for the system. The current-mode buck converter provides a fast transient response and cycle-by-cycle switching current limit. All output voltages are fixed internally with few external ponents required. At light load or no-load operation on the buck regulator output, the RAA212831 operates in a pulse skipping mode in DCM. When the output load is increased, and the buck regulator enters CCM, the controller operates at 350k Hz. The RAA212831 offers prehensive protection including UVLO, high-side overcurrent, output undervoltage, and over-temperature protection. The device is available in SOIC8-E package. VIN CIN LDO_VIN C5V LDO_5V LDO_3V3 C3V3 Features - Buck Converter: - 4.5V to 72V input voltage - Adjustable output voltage from 1.25V to VIN×Dmax - 500m A output load capability - 0.6Ω high-side MOSEFT r DS(ON) - Fixed switching frequency 350k Hz in CCM operation - Pulse skipping mode in DCM operation - 6V standby...