LM20333A

LM20333A 36V, 3A Synchronous Buck Regulator with Frequency Synchronization www.DataSheet4U.com January 20, 2009 LM20333A 36V, 3A Synchronous Buck Regulator with Frequency Synchronization General Description The LM20333A is a full featured synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems. The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit. The LM20333A is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20333A is pre-biased at startup it will not sink current to pull the output low until the internal softstart ramp exceeds the voltage at the feedback pin. The switching frequency of the LM20333A can be synchronized to an external clock by use of the SYNC pin. T...