AAT2158

PRODUCT DATASHEET AAT2158 SwitchRegTM General Description The AAT2158 SwitchReg is a 1.5A step-down converter with an input voltage range of 2.4V to 5.5V and an adjustable output voltage from 0.6V to VIN. The 1.4MHz switching frequency enables the use of small external components. The small footprint and high efficiency make the AAT2158 an ideal choice for portable applications. The AAT2158 delivers 1.5A maximum output current while consuming only 42μA of no-load quiescent current. Ultra-low RDS(ON) integrated MOSFETs and 100% duty cycle operation make the AAT2158 an ideal choice for high output voltage, high current applications which require a low dropout threshold. The AAT2158 provides excellent transient response and high output accuracy across the operating range. No external compensation components are required. The AAT2158 maintains high efficiency throughout the load range. The AAT2158’s unique architecture produces reduced ripple and spectral noise. Over-temperature and short-circuit protection safeguard the AAT2158 and system components from damage. The AAT2158 is available in a Pb-free, space-saving 16-pin 3x3mm QFN package. The product is rated over an operating temperature range of -40°C to +85°C. 1.5A Low Noise Step-Down Converter Features • • • • • • • • • • • • • • 1.5A Maximum Output Current Input Voltage: 2.4V to 5.5V Output Voltage: 0.6V to VIN Up to 95% Efficiency Low Noise Light Load Mode 42μA No Load Quiescent Current No External Compensation Required 1.4MHz Switching Frequency 100% Duty Cycle Low-Dropout Operation Internal Soft Start Over-Temperature and Current Limit Protection 2.5V) at low input voltages. The integrated low-loss MOSFET switches can provide greater than 95% efficiency at full load. Light load operation maintains high efficiency, low ripple and low spectral noise even at lower currents (typically