Description

The LTC1147LIS8 is a step-down switching regulator controller in the LTC1147 series. It features automatic Burst Mode operation to maintain high efficiencies at low output currents. This device drives an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture providing constant ripple current in the inductor.

Specifications and features

- Very High Efficiency: Over 95% Possible

- Wide VIN Range: 3.5V* to 16V

- Current Mode Operation for Excellent Line and Load Transient Response

- High Efficiency Maintained Over Three Decades of Output Current

- Low 160µA Standby Current at Light Loads

- Logic Controlled Micropower Shutdown: IQ < 20µA

- Short-Circuit Protection

- Very Low Dropout Operation: 100% Duty Cycle

- High Efficiency in a Small Amount of Board Space

- Output Can Be Externally Held High in Shutdown

- Available in 8-Pin SO Package

Application Scenarios

- Notebook and Palmtop Computers

- Portable Instruments

- Battery-Operated Digital Devices

- Cellular Telephones

- DC Power Distribution Systems

- GPS Systems

Comparison

- Very high efficiency over 95%

- Wide VIN range from 3.5V to 16V

- Excellent line and load transient response

- High efficiency maintained over three decades of output current

- Low standby current at light loads

- Logic controlled micropower shutdown

- Short-circuit protection

- Very low dropout operation with 100% duty cycle

- High efficiency in a small amount of board space

- Output can be externally held high in shutdown

- Available in 8-Pin SO Package

- No specific disadvantages mentioned in the provided information