LT1611
PRODUCTIONInverting 1.4MHz Switching Regulator in 5-Lead SOT-23
- Part Models
- 2
- 1ku List Price
- Starting From $2.85
Part Details
- Very Low Noise: 1mVP–P Output Ripple
- –5V at 150mA from a 5V Input
- Better Regulation Than a Charge Pump
- Effective Output Impedance: 0.14Ω
- Uses Tiny Capacitors and Inductors
- Internally Compensated
- Fixed Frequency 1.4MHz Operation
- Low Shutdown Current: <1µA
- Low VCESAT Switch: 300mV at 300mA
- Tiny 5-Lead SOT-23 Package
The LT1611 is the industry’s first inverting 5-lead SOT-23 current mode DC/DC converter. Intended for use in small, low power applications, it operates from an input voltage as low as 1.1V and switches at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Its small size and high switching frequency enable the complete DC/DC converter function to consume less than 0.25 square inches of PC board area. Capable of generating –5V at 150mA from a 5V supply or –5V at 100mA from a 3V supply, the LT1611 replaces nonregulated “charge pump” solutions in many applications.
The LT1611 operates in a dual inductor inverting topology which filters the input side as well as the output side of the DC/DC converter. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. No load quiescent current of the LT1611 is 3mA, while in shutdown quiescent current drops to 0.5µA. The 36V switch allows VIN to VOUT differential of up to 33V.
The LT1611 is available in the 5-lead SOT-23 package.
Applications
- MR Head Bias
- Digital Camera CCD Bias
- LCD Bias
- GaAs FET Bias
- Positive-to-Negative Conversion
Documentation
Data Sheet 1
Reliability Data 1
Technical Articles 3
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1611CS5#TRMPBF | 5-Lead TSOT-23 | ||
| LT1611CS5#TRPBF | 5-Lead TSOT-23 |
This is the most up-to-date revision of the Data Sheet.
Tools & Simulations
LTspice 2
- LT1611 Demo Circuit - Low Noise Inverting DC/DC Converter (1.1-10V to -5V @ 150mA)
- LT1611 - Display Control and Power
Models for the following parts are available in LTspice:
- LT1611
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.