DESCRIPTION

· The RT5753A/B is a 3A synchronous step-down DC-DC converter with an input voltage range of 2.5V to 5.5V.

· It features an accurate 0.6V reference voltage and integrates low R DS(ON) power MOSFETs for high efficiency.

· The device uses Advanced Constant On-Time (ACOT®) control for fast transient response and operates in nearly constant switching frequency.

· RT5753A operates in automatic PSM for high efficiency at light loads, while RT5753B operates in Forced PWM for tight voltage regulation.

· It includes robust over-current protection, cycle-by-cycle current limit, and various safety features like under-voltage lockout, over-voltage protection, and over-temperature protection.

FEATURES

· Input voltage range: 2.5V to 5.5V.

· Integrated 100mΩ and 70mΩ FETs.

· 100% duty cycle for lowest dropout.

· Internal reference voltage with 1% accuracy.

· 1.2MHz typical switching frequency.

· Power saving mode for light loads (RT5753A).

· Advanced Constant On-Time (ACOT®) control.

· Internal soft startup (1.5ms).

· Enable control input and power good indicator.

· Both FETs over-current protection and negative over-current protection (RT5753B).

· Input under-voltage lockout, output under-voltage, over-voltage, and over-temperature protection.

· RoHS compliant and halogen free.

APPLICATIONS

· Mobile phones and handheld devices.

· STB, cable modem, and xDSL platforms.

· WLAN ASIC power and storage (SSD and HDD).

· General purpose for POL LV buck converters.