7.5A, 150kHz Switching Regulators

The LT1268B and LT1268 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (150kHz) and higher switch current, they can be operated in all standard switching configurations including buck, boost, flyback, and inverting. A high current, high efficiency switch is included on the die along with all oscillator, control, and protection circuitry. Integration of all functions allows the LT1268 to be built in standard 5-pin power packages. This makes it extremely easy to use and provides “bust proof” operations similar to that obtained with 3-pin linear regulators.

The LT1268 operate with supply voltages from 3.5V to 30V and draw only 7mA quiescent current. By utilizing current mode switching techniques, it provides excellent AC and DC load and line regulation.

The LT1268 use an adaptive anti-sat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 100µA typical for standby operation.

Applications

* High Efficiency Boost Converter

* PC Power Supply with Multiple Outputs

* Battery Upconverter

* Negative-to-Positive Converter

* Wide Input Voltage Range: 3.5V to 30V

* Low Quiescent Current: 7mA

* Internal 7.5A Switch

* Very Few External Parts Required

* Self-Protected Against Overloads

* Available in Standard and Surface Mount 5-Pin Packages

* Can Be Externally Synchronized (See LT1072 Data Sheet)