The LM20333 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 LM20333 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 LM20333 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.
The switching frequency of the LM20333 can be synchronized to an external clock by use of the SYNC pin. The SYNC pin is capable of synchronizing to input signals ranging from 250 kHz to 1.5 MHz.
The LM20333 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.
4.5V to 36V Input Voltage Range
3A Output Current, 5.2A Peak Current
130 mΩ/110 mΩ Integrated Power MOSFETs
94% Peak Efficiency with Synchronous Rectification
1.5% Feedback Voltage Accuracy
Current Mode Control, Selectable Compensation
Oscillator Synchronization from 250kHz to 1.5MHz
Adjustable Output Voltage Down to 0.8V
Compatible with Pre-biased Loads
Programmable Soft-start with External Capacitor
Precision Enable Pin with Hysteresis
OVP, UVLO Inputs and PGOOD Output
Internally Protected with Peak Current Limit, Thermal Shutdown and Restart