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.
USER NOTE:
This data sheet is only intended to provide specifications, graphs and
a general functional description of the LT1270A/LT1270. Application
circuits are included to show the capability of the LT1270A/LT1270. A
complete design manual (AN-19) should be obtained to assist in
developing new designs. AN-19 contains a comprehensive discussion of
both the LT1070 and the external components used with it, as well as
complete formulas for calculating the values of these components. AN-19
can also be used for the LT1270A/LT1270 by factoring in the higher
switch current rating and higher operating frequency.
A comprehensive CAD program called SwitcherCad is also available.
Contact the local sales office in your area or the factory direct.
Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
LT1270ACT#PBF | TO-220 | 5 | C | $10.50 | $8.50 | RoHS |
LT1270CT#PBF | TO-220 | 5 | C | $7.08 | $5.60 | RoHS |
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To simulate this and other Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.
For other simulation tools, visit our Design Simulation and Device Models page.