RT5744 Datasheet | Richtek

RT5744/RT5746 2.4MHz 4A/6A Step-Down Converter with I2C Interface General Description The RT5744 and RT5746 are step-down switching voltage regulators that deliver a digitally programmable output from an input voltage supply of 2.5V to 5.5V. The output voltage is programmed through an I2C interface that can operate up to 3.4MHz. Using a proprietary architecture with synchronous rectification, the RT5744 and RT5746 are capable of delivering continuous 4A and 6A, maintaining that efficiency at load currents as low as 10m A. The regulator operates at a nominal fixed frequency of 2.4MHz, which reduces the external ponent counts. Additional output capacitance can be added to improve regulation during load transients without affecting stability. At moderate and light loads, Pulse Frequency Modulation (PFM) is used to operate in power-saving mode with a typical quiescent current of 45A at room temperature. Even with such a low quiescent current, the part exhibits excellent transient response during large load swings. At higher loads, the system automatically switches to fixed frequency control, operating at 2.4MHz. In shutdown mode, the supply current is typically 0.1A, and is excellent in reducing power consumption. The PFM mode can be disabled if the fixed frequency is desired. The RT5744 and RT5746 are available in WL-CSP-14B 1.31x2.02 (BSC) package. The remended junction temperature range is - 40C to 125C. Features - Programmable Output Voltage Range - 0.27V to 1.4V, 6.25m V/bit - Programmable Slew Rate for Voltage Transitions - Steady 2.4MHz Switching Frequency - Fast Load Transient - Continuous Output Current Capability: 4A/6A - 2.5V to 5.5V Input Voltage Range - Digitally Programmable Output Voltage - I2C-patible Interface Up to 3.4Mbps - PFM Mode for High Efficiency at Light Load - Quiescent Current in PFM Mode: 45A (Typical) - Input Undervoltage Lockout (UVLO) - Thermal Shutdown and Overload Protection - Power Good Indicator Applications -...