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LT1075CS8, LT1075CT, LT1076

Table of contents:
Info of LT1075CS8
Info of LT1075CT
Info of LT1076

LT1075CS8, LT1075CT, LT1076 Selling Leads, Datasheet

MFG:LINEAR Package Cooled:3.9mmSMD8 D/C:08+

LT1075CS8, LT1075CT, LT1076 Datasheet download

Five Points

Part Number: LT1075CS8

MFG: LINEAR

Package Cooled: 3.9mmSMD8

D/C: 08+

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LT1076 General Description

The LT(R) 1074 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 innov ations allow this device to be used as a positive-to-negative converter, a negative boost converter, and as a flyb ack 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 instanta neously 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 low cost TO-220 or TO-3 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.

LT1076 Maximum Ratings

Input Voltage
LT1074/ LT1076............................................................. 45V
LT1074HV/LT1076HV ..................................................... 64V
Switch Voltage with Respect to Input Voltage
LT1074/ LT1076.............................................................. 64V
LT1074HV/LT1076HV ..................................................... 75V
Switch Voltage with Respect to Ground Pin (V _SW Negative)
LT1074/LT1076 (Note 7)................................................. 35V
LT1074HV/LT1076HV (Note 7) ....................................... 45V
Feedback Pin Voltage..........................................2V, +10V
Shutdown Pin Voltage (Not to Exceed V _IN ).................. 40V
I _LIMPin Voltage (Forced)............................................. 5.5V
Maximum Operating Ambient Temperature Range
Commercial..........................................................0 to 70
Industrial..................................................... 40 to 85
Military................................................. ........55 to 125
Maximum Operating Junction Temperature Range
Commercial.......................................................0 to 125
Industrial.....................................................40 to 125
Military..........................................................55 to 150
Maximum Storage Temperature ................ 65 to 150
Lead Temperature (Soldering, 10 sec)........................300

LT1076 Features

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

LT1076 Typical Application

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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