DESCRIPTION
The LT1270A/LT1270 are monolithic high power switching regulators. Identical to the popular LT1070, except for switching frequency (60kHz) 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 LT1270A/LT1270 to be built in a standard TO-220 power package. This makes it extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.
The LT1270A/LT1270 operate with supply voltages from 3.5V to 30V, and draw only 7mA quiescent current. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation.
The LT1270A/LT1270 use 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.

FEATURES
■ Wide Input Voltage Range: 3.5V to 30V
■ Low Quiescent Current: 7mA
■ Internal 8A Switch (10A for LT1270A)
■ Very Few External Parts Required
■ Self-Protected Against Overloads
■ Shutdown Mode Draws Only 100µA Supply Current
■ Flyback-Regulated Mode Has Fully Floating Outputs
■ Can be Externally Synchronized (See LT1072 Data Sheet)
■ Comes in Standard 5-Pin TO-220 Package

APPLICATIONS
■ High Efficiency Buck Converter
■ PC Power Supply with Multiple Outputs
■ Battery Upconverter
■ Negative-to-Positive Converter