LTC1430A

LTC1430A High Power Step-Down Switching Regulator Controller FEATURES s s DESCRIPTIO s s s s s s s s s s High Power 5V to 1.xV-3.xV Switching Controller: Can Exceed 10A Output Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply All N-Channel External MOSFETs Fixed Frequency Operation—Small L Excellent Output Regulation: ± 1% Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible No Low Value Sense Resistor Needed Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance Quiescent Current: 350µA Typ, 1µA in Shutdown Fast Transient Response Adjustable or Fixed 3.3V Output Available in 8-Lead SO and 16-Lead GN and SO Packages The LTC ®1430A is a high power, high efficiency switching regulator controller optimized for 5V to 1.xV-3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ± 1% over temperature, load current and line voltage shifts. The LTC1430A uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor. The LTC1430A includes a fixed frequency PWM oscillator for low output ripple under virtually all operating conditions. The 200kHz free-running clock frequen...