Description
The LD49300xx is a high-bandwidth, low dropout, 3.0 A voltage regulator, ideal for powering core voltages of low-power microprocessors. The LD49300xx implements a dual supply configuration allowing for very low output impedance and very fast transient response. The LD49300xx requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the main supply rail. The input supply operates from 1.4 V to 5.5 V and the bias supply requires between 3 V and 6 V for proper operation. The LD49300xx offers fixed output voltages from 0.8 V to 1.8 V and adjustable output voltages down to 0.8 V. The LD49300xx requires a minimum output capacitance for stability, and works optimally with small ceramic capacitors.

FEATUREs
■ Input voltage range:
   – VI = 1.4 V to 5.5 V
   – VBIAS = 3 V to 6 V
■ Stable with ceramic capacitor
■ ±1.5 % initial tolerance
■ Maximum dropout voltage (VI - VO) of 400 mV
   over temperature
■ Adjustable output voltage down to 0.8 V
■ Ultra fast transient response (up to 10 MHz
   bandwidth)
■ Excellent line and load regulation
   specifications
■ Logic controlled shutdown option
■ Thermal shutdown and current limit protection
■ Junction temperature range: - 25 °C to 125 °C

APPLICATIONs
■ Graphics processors
■ PC add-in cards
■ Microprocessor core voltage supply
■ Low voltage digital ICs
■ High efficiency linear power supplies
■ SMPS post regulators