AAT2749

DATA SHEET AAT2749 3.0MHz Step-Down Converter and Low-VIN LDO General Description The AAT2749 is a two channel power regulator that operates from 2.3V to 5.5V. The AAT2749 contains a 3.0MHz, 600mA step-down converter and a low input voltage 300mA LDO regulator. The step-down converter can deliver 600mA of load current. The 3.0MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT2749 step-down converter maintains high efficiency throughout the operating range, which is critical for portable applications. Fixed frequency, low noise operation can be forced by a logic signal on the MODE pin. The AAT2749 also contains a 300mA LDO regulator with input voltage capability as low as 1.62V. The LDO regulator power input can be tied directly to the output of the step-down regulator to increase efficiency. Total quiescent current for the step-down converter and LDO is a low 100μA under no load condition. The AAT2749 is available in a Pb-free, space-saving 9-pin chip scale package (CSP) (200μm bump in 400μm pitch) and is rated over the -40°C to +85°C temperature range. Features  VIN Range: 2.3V to 5.5V  Two Outputs ▪ VOUT_BUCK = 1.8V ▪ VOUT_LDO = 1.0V, 1.2V  Step-Down Converter ▪ Ultra-Small 0603 Inductor (Height 1mm) ▪ Up to 92% Efficiency ▪ 3.0MHz Switching Frequency ▪ MODE Selection Pin to Select Forced PWM or PWM/ LL Operation Mode ▪ Current Limit Protection ▪ Automatic Soft Start LDO Regulator ▪ VINL Range: 1.62V to V...