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LT1270 - 8A and 10A High Efficiency Switching Regulators

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

Typical Application

LT1270
LT1270
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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.

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.

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Packaging

DD-5, T5

LT1270

Order Options

  • Tape and Reel: Add #TR
  • Lead Free: Add #PBF
  • Lead Free Tape and Reel: Add #TRPBF

Package Variations and Pricing

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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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Related Information

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Applications

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

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.

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