Features and Benefits
- Wide Input Voltage Range: 3.2V to 34V
- Micropower Operation: IQ = 12µA
- 5V at 250mA from 6.5V to 34V Input (LT1934)
- 5V at 60mA from 6.5V to 34V Input (LT1934-1)
- 3.3V at 250mA from 4.5V to 34V Input (LT1934)
- 3.3V at 60mA from 4.5V to 34V Input (LT1934-1)
- Low Shutdown Current: <1µA
- Low VCESAT Switch: 200mV at 300mA
- Low Profile (1mm) SOT-23 (ThinSOT™) and (2mm × 3mm × 0.8mm) 6-Pin DFN Package
The LT1934 is a micropower step-down DC/DC converter with internal 400mA power switch, packaged in a low profile (1mm) ThinSOT. With its wide input range of 3.2V to 34V, the LT1934 can regulate a wide variety of power sources, from 4-cell alkaline batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Quiescent current is just 12µA and a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Burst Mode® operation and the low drop internal power switch result in high efficiency over a broad range of load current.
The LT1934 provides up to 300mA of output current. The LT1934-1 has a lower current limit, allowing optimum choice of external components when the required output current is less than 60mA. Fast current limiting protects the LT1934 and external components against shorted outputs, even at 34V input.
- Wall Transformer Regulation
- Automotive Battery Regulation
- Standby Power for Portable Products
- Distributed Supply Regulation
- Industrial Control Supplies
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 544 features the LT1934 and LT1934-1 wide input range micro power step-down switching regulators. There are two switching regulator circuits in DC544, the LT1934ES6 circuit designed to convert a 4.5V to 34V input voltage range to 3.3V or 5V (jumper-selectable) at 250mA output, and the LT1934ES6-1 circuit designed for the same input and output voltages but at a lighter 50mA load current. For 5V output operation, the input voltage range is 6.5V to 34V.
Documentation & Resources
R303 Reliability Data3/23/2018
DC544A - Demo Manual9/24/2009
Micropower SOT-23 Buck Regulator Accepts Inputs to 34V3/1/2003 LT Journal
Tools & Simulations
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Models for the following parts are available in LTspice:
LT1934 Companion Parts
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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.