LT1170 - 100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators

Features

  • Wide Input Voltage Range: 3V to 60V
  • Low Quiescent Current: 6mA
  • Internal 5A Switch
    (2.5A for LT1171, 1.25A for LT1172)
  • Shutdown Mode Draws Only 50μA Supply Current
  • Very Few External Parts Required
  • Self-Protected Against Overloads
  • Operates in Nearly All Switching Topologies
  • Flyback-Regulated Mode Has Fully Floating Outputs
  • Comes in Standard 5-Pin Packages
  • LT1172 Available in 8-Pin MiniDIP and Surface Mount Packages
  • Can Be Externally Synchronized

Typical Application

LT1170 Typical Application
LT1170 Typical Application

Description

The LT1170/LT1171/LT1172 are monolithic high power switching regulators. They can be operated in all standard switching configurations including buck, boost, flyback, forward, inverting and “Cuk.” 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 LT1170/LT1171/LT1172 to be built in a standard 5-pin TO-3 or TO-220 power package as well as the 8-pin packages (LT1172). This makes them extremely easy to use and provides “bust proof” operation similar to that obtained with 3-pin linear regulators.

The LT1170/LT1171/LT1172 operate with supply voltages from 3V to 60V, and draw only 6mA quiescent current. They can deliver load power up to 100W with no external power devices. By utilizing current-mode switching techniques, they provide excellent AC and DC load and line regulation.

The LT1170/LT1171/LT1172 have many unique features not found even on the vastly more difficult to use low power control chips presently available. They use adaptive antisat switch drive to allow very wide ranging load currents with no loss in efficiency. An externally activated shutdown mode reduces total supply current to 50μA typically for standby operation.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

N-8, J8, SO-8, SW-16, T5, DD-5

LT1170 Package Drawing
LT1170 Package Drawing
LT1170 Package Drawing
LT1170 Package Drawing
LT1170 Package Drawing
LT1170 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1170CQ DD PAK 5 C $7.58 $6.00 View
LT1170CQ#PBF DD PAK 5 C $7.58 $6.00 View
LT1170CQ#TR DD PAK 5 C $6.12 View
LT1170CQ#TRPBF DD PAK 5 C $6.12 View
LT1170CT TO-220 5 C $7.08 $5.60 View
LT1170CT#06PBF TO-220 5 C $7.08 $5.60 View
LT1170CT#30PBF TO-220 5 C $7.53 $6.05 View
LT1170CT#PBF TO-220 5 C $7.08 $5.60 View
LT1170HVCQ DD PAK 5 C $8.60 $7.50 View
LT1170HVCQ#PBF DD PAK 5 C $8.60 $7.50 View
LT1170HVCQ#TR DD PAK 5 C $7.62 View
LT1170HVCQ#TRPBF DD PAK 5 C $7.62 View
LT1170HVCT TO-220 5 C $9.17 $7.25 View
LT1170HVCT#06 TO-220 5 C $9.17 $7.25 View
LT1170HVCT#06PBF TO-220 5 C $9.17 $7.25 View
LT1170HVCT#30PBF TO-220 5 C $9.62 $7.95 View
LT1170HVCT#PBF TO-220 5 C $9.17 $7.25 View
LT1170HVIT TO-220 5 I $11.90 $9.65 View
LT1170HVIT#31PBF TO-220 5 I $12.35 $10.10 View
LT1170HVIT#PBF TO-220 5 I $11.90 $9.65 View
LT1170IQ DD PAK 5 I $9.50 $7.80 View
LT1170IQ#PBF DD PAK 5 I $9.50 $7.80 View
LT1170IQ#TR DD PAK 5 I $7.92 View
LT1170IQ#TRPBF DD PAK 5 I $7.92 View
LT1170IT TO-220 5 I $9.25 $7.60 View
LT1170IT#PBF TO-220 5 I $9.25 $7.60 View
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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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Logic Supply 5V at 10A
  • 5V Logic to ±15V Op Amp Supply
  • Battery Upconverter
  • Power Inverter (+ to –) or (– to +)
  • Fully Floating Multiple Outputs

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT1170
LT1170HV

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