Features and Benefits
- 1.2MHz Switching Frequency
- High Output Voltage: Up to 38V
- Wide Input Range: 2.3V to 16V
- Low VCESAT Switch: 180mV at 2A
- Uses Small Surface Mount Components
- 5V at 1A from 3.3V Input
- 12V at 600mA from 5V Input
- Low Shutdown Current: <1µA
- Pin-for-Pin Compatible with the LT1613 and LT1930
- Low Profile (1mm) SOT-23 (ThinSOT™) Package
The LT1935 is the industry’s highest power SOT-23 switching regulator. Its unprecedented 2A, 40V internal switch allows high output currents to be generated in a small footprint. Intended for space-conscious applications, the LT1935 switches at 1.2MHz, allowing the use of tiny, low profile inductors and capacitors 2mm or less in height. The NPN switch achieves a VCESAT of just 180mV at 2A independent of supply voltage, resulting in high efficiency even at maximum power levels from a 3V input.
A constant frequency, internally compensated, current mode PWM architecture results in low, predictable output noise that is easy to filter. Low ESR ceramic capacitors can be used on the output, further reducing noise to the millivolt level. The high voltage switch on the LT1935 is rated at 40V, making the device ideal for boost converters up to 38V as well as for single-ended primary inductance converter (SEPIC) and flyback designs. The device can generate 5V at up to 1A from a 3.3V supply or 5V at 550mA from four alkaline cells in a SEPIC design.
The LT1935 is available in a 5-lead SOT-23 package.
- Digital Cameras
- Battery Backup
- LCD Bias
- Local 5V or 12V Supply
- PC Cards
- xDSL Power Supply
- TFT-LCD Bias Supply
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.
Evaluation Kits (1)
Demonstration circuit DC683 features LT1935 1.2MHz boost DC/DC converter with a 2A switch. The demo board is designed to generate 12V output from a 3.3V to 5.5V input voltage range and can provide 600mA at 12V from a 5V input.
Documentation & Resources
R303 Reliability Data3/23/2018
DC683A - Demo Manual9/24/2009
2A, 40V, SOT-23 Boost Converter Provides High Power in Small Spaces3/1/2005 LT Journal
Tools & Simulations
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT1935ES5#TRMPBF||Material Declaration||Reliability Data||5-Lead TSOT-23|
|LT1935ES5#TRPBF||Material Declaration||Reliability Data||5-Lead TSOT-23|
|Wafer Fabrication Data||R303 Reliability Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.