SC1452

• Up to 150mA per regulator output
• Low quiescent current
• Low dropout voltage
• Wide selection of output voltages
• Stable operation with ceramic caps
• Tight load and line regulation
• Current and thermal limiting
• Reverse input polarity protection
• <1uA off-mode current
• Logic controlled electronic enable
• Programmable reset
•Full industrial temperature range

• Cellular telephones
• Palmtop/Laptop computers
• Battery-powered equipment
• Bar code scanners
• SMPS post regulator/dc to dc modules
• High efficiency linear power supplies

The SC1452 is a state of the art device intended to provide maximum performance and flexibility in battery operated systems. It has been designed specifically to fully support a single Li-Ion battery and its external charger voltages.

The SC1452 contains two independently enabled, ultra low dropout voltage regulators (ULDOs). It operates from an input voltage range of 2.5V to 6.5V, and a wide variety of output voltage options are available which are designed to provide an initial tolerance of ±1% and ±2% over temperature.

Each regulator has an associated active-low reset signal which is asserted when the voltage output declines below the preset threshold. Once the output recovers, the reset continues to be asserted (delayed) for a predetermined time, 50ms for reset A and 150ms for reset B. In the case of regulator B, the delay time may be reduced by the addition of an external capacitor.

The SC1452 has a bypass pin to enable the user to capacitively decouple the bandgap reference for very low output noise (down to 50Vrms).

The devices utilize CMOS technology to achieve very low operating currents (typically 150A with both outputs supplying 150mA). The dropout voltage is typically 165mV at 150mA, helping to prolong battery life. In addition, the devices are guaranteed to provide 400mA of peak current for applications which require high initial inrush current. They have been designed to be used with low ESR ceramic capacitors to save cost and PCB area.

The SC1452 comes in the low profile 10-lead MSOP package.