LT1176/LT1176-5: Step-Down Switching Regulator Data Sheet2/28/2011141K
Features and Benefits
- 1.2A Onboard Switch
- 100kHz Switching Frequency
- Excellent Dynamic Behavior
- DIP and Surface Mount Packages
- Only 8mA Quiescent Current
- Preset 5V Output Available
- Operates Up to 35V Input
- Micropower Shutdown Mode
The LT1176 is a 1A 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 allows 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 below ground.
The LT1176 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 LT1176 nearly bust proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 35V, but a self boot feature allows input voltages as low as 5V in the inverting and boost configurations.
The LT1176 is available in a low cost 8-lead DIP package with frequency preset at 100kHz and current limit at 1.7A. An adjustable output is offered as well as a preset 5V version. For further design details and application help, see the LT1074/LT1076 data sheet and Application Note 44.
- Buck Converter with Output Voltage Range of 2.5V to 30V
- Positive-to-Negative Converter
- Negative Boost Converter
- Multiple Output Buck Converter
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R117 Reliability Data3/23/201821 K
AN44 - LT1074/LT1076 Design Manual2/5/2013465K
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT1176CN8#PBF||Material Declaration||Reliability Data||8-Lead PDIP (Narrow 0.3 Inch)|
|LT1176CN8-5#PBF||Material Declaration||Reliability Data||8-Lead PDIP (Narrow 0.3 Inch)|
|LT1176CSW#PBF||Material Declaration||Reliability Data||20-Lead SOIC (Wide 0.3 Inch)|
|LT1176CSW#TRPBF||Material Declaration||Reliability Data||20-Lead SOIC (Wide 0.3 Inch)|
|LT1176CSW-5#PBF||Material Declaration||Reliability Data||20-Lead SOIC (Wide 0.3 Inch)|
|LT1176CSW-5#TRPBF||Material Declaration||Reliability Data||20-Lead SOIC (Wide 0.3 Inch)|
|Wafer Fabrication Data||R117 Reliability Data|
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