LT1076 - Step-Down Switching Regulator

Features

  • 5A Onboard Switch (LT1074)
  • Operates Up to 60V Input
  • 100kHz Switching Frequency
  • Greatly Improved Dynamic Behavior
  • Available in Low Cost 5 and 7-Lead Packages
  • Only 8.5mA Quiescent Current
  • Programmable Current Limit
  • Micropower Shutdown Mode

Typical Application

LT1076 Typical Application
LT1076 Typical Application

Description

The LT1074 is a 5A (LT1076 is rated at 2A) monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, and all current limit components,are included on the chip. The topology is a classic positive “buck” configuration but several design innovations allow this device to be used as a positive-to-negative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1074 to drive a tapped-inductor in the buck mode with output currents up to 10A.

The LT1074 uses a true analog multiplier in the feedback loop. This makes the device respond nearly instantaneously to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behavior of the regulator is significantly improved over previous designs.

On-chip pulse by pulse current limiting makes the LT1074 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost configurations.

The LT1074 is available in lowcost TO-220 or DD packages with frequency pre-set at 100kHz and current limit at 6.5A (LT1076 =2.6A). A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details.

A fixed 5V output, 2A version is also available. See LT1076-5.

Packaging

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

DD-5, DD-7, T5, T7

LT1076 Package Drawing
LT1076 Package Drawing
LT1076 Package Drawing
LT1076 Package Drawing
LT1076 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1076CQ DD PAK 5 C $5.00 $3.95 View
LT1076CQ#PBF DD PAK 5 C $5.00 $3.95 View
LT1076CQ#TR DD PAK 5 C $4.07 View
LT1076CQ#TRPBF DD PAK 5 C $4.07 View
LT1076CQ-5 DD PAK 5 C $5.00 $3.95 View
LT1076CQ-5#PBF DD PAK 5 C $5.00 $3.95 View
LT1076CQ-5#TR DD PAK 5 C $4.07 View
LT1076CQ-5#TRPBF DD PAK 5 C $4.07 View
LT1076CR DD PAK 7 C $5.42 $4.30 View
LT1076CR#PBF DD PAK 7 C $5.42 $4.30 View
LT1076CR#TR DD PAK 7 C $4.42 View
LT1076CR#TRPBF DD PAK 7 C $4.42 View
LT1076CR-5 DD PAK 7 C $5.42 $4.30 View
LT1076CR-5#PBF DD PAK 7 C $5.42 $4.30 View
LT1076CR-5#TR DD PAK 7 C $4.42 View
LT1076CR-5#TRPBF DD PAK 7 C $4.42 View
LT1076CT TO-220 5 C $4.33 $3.40 View
LT1076CT#06 TO-220 5 C $4.33 $3.40 View
LT1076CT#06PBF TO-220 5 C $4.33 $3.40 View
LT1076CT#30PBF TO-220 5 C $4.78 $3.85 View
LT1076CT#PBF TO-220 5 C $4.33 $3.40 View
LT1076CT-5 TO-220 5 C $4.33 $3.40 View
LT1076CT-5#06PBF TO-220 5 C $4.33 $3.40 View
LT1076CT-5#PBF TO-220 5 C $4.33 $3.40 View
LT1076CT7 TO-220 7 C $5.00 $3.95 View
LT1076CT7#06 TO-220 7 C $5.00 $3.95 View
LT1076CT7#PBF TO-220 7 C $5.00 $3.95 View
LT1076CT7-5 TO-220 7 C $5.00 $3.95 View
LT1076CT7-5#06 TO-220 7 C $5.00 $3.95 View
LT1076CT7-5#PBF TO-220 7 C $5.00 $3.95 View
LT1076HVCR#PBF DD PAK 7 C $9.42 $7.45 View
LT1076HVCR#TR DD PAK 7 C $7.57 View
LT1076HVCR#TRPBF DD PAK 7 C $7.57 View
LT1076HVCT TO-220 5 C $7.58 $6.00 View
LT1076HVCT#06PBF TO-220 5 C $7.58 $6.00 View
LT1076HVCT#PBF TO-220 5 C $7.58 $6.00 View
LT1076HVCT-5 TO-220 5 C $7.58 $6.00 View
LT1076HVCT-5#06 TO-220 5 C $7.58 $6.00 View
LT1076HVCT-5#PBF TO-220 5 C $7.58 $6.00 View
LT1076HVCT7 TO-220 7 C $8.75 $6.90 View
LT1076HVCT7#PBF TO-220 7 C $8.75 $6.90 View
LT1076HVCT7-5 TO-220 7 C $8.75 $6.90 View
LT1076HVCT7-5#PBF TO-220 7 C $8.75 $6.90 View
LT1076HVIR DD PAK 5 I $10.95 $9.05 View
LT1076HVIR#PBF DD PAK 5 I $10.95 $9.05 View
LT1076HVIR#TR DD PAK 5 I $9.17 View
LT1076HVIR#TRPBF DD PAK 5 I $9.17 View
LT1076HVIT TO-220 5 I $8.92 $7.35 View
LT1076HVIT#06PBF TO-220 5 I $8.92 $7.35 View
LT1076HVIT#PBF TO-220 5 I $8.92 $7.35 View
LT1076HVIT-5 TO-220 5 I $9.55 $7.35 View
LT1076HVIT-5#PBF TO-220 5 I $9.55 $7.35 View
LT1076IQ DD PAK 5 I $5.80 $4.75 View
LT1076IQ#PBF DD PAK 5 I $5.80 $4.75 View
LT1076IQ#TR DD PAK 5 I $4.87 View
LT1076IQ#TRPBF DD PAK 5 I $4.87 View
LT1076IR DD PAK 7 I $6.30 $5.15 View
LT1076IR#PBF DD PAK 7 I $6.30 $5.15 View
LT1076IR#TR DD PAK 7 I $5.27 View
LT1076IR#TRPBF DD PAK 7 I $5.27 View
LT1076IT TO-220 5 I $5.92 $4.85 View
LT1076IT#06 TO-220 5 I $5.92 $4.85 View
LT1076IT#06PBF TO-220 5 I $5.92 $4.85 View
LT1076IT#PBF TO-220 5 I $5.92 $4.85 View
LT1076IT-5 TO-220 5 I $5.92 $4.85 View
LT1076IT-5#PBF TO-220 5 I $5.92 $4.85 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

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Applications

  • Buck Converter with Output Voltage Range of 2.5V to 50V
  • Tapped-Inductor Buck Converter with 10A Output at 5V
  • Positive-to-Negative Converter
  • Negative Boost Converter
  • Multiple Output Buck Converter

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