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Design NotesProduce Negative Voltages Using the Buck Controller
Features and Benefits
- Rail-to-Rail Input and Output
- Small SOT-23 Package
- Gain Bandwidth Product: 10MHz
- –40°C to 85°C Operation
- Slew Rate: 2.25V/μs
- Low Input Offset Voltage: 1.5mV Max
- High Output Current: 25mA Min
- Specified on 3V, 5V and ±5V Supplies
- High Voltage Gain: 1000V/mV 10k Load
- High CMRR: 96dB Typ
- High PSRR: 90dB Typ
- Input Bias Current: 300nA Max
- Input Offset Current: 25nA Max
- Low Profile (1mm) SOT-23 (ThinSOT™) Package
The LT1797 is a unity-gain stable 10MHz op amp available in the small SOT-23 package that operates on all single and split supplies with a total voltage of 2.7V to 12V. The amplifier draws 1mA of quiescent current and has a slew rate of 2.25V/μs.
The input common mode range of the LT1797 includes both rails, making it ideal for current sensing applications. The input stage incorporates phase reversal protection to prevent false outputs from occurring when the inputs are driven beyond the supplies. Protective resistors are included in the input leads so that current does not become excessive when the inputs are forced above or below the supplies.
The output of the LT1797 can swing to within 50mV of V+ and 8mV of V– without drawing excess current in either condition. The amplifier can drive loads up to 25mA and still maintain rail-to-rail capability.
The LT1797 op amp is available in the space saving 5-lead SOT-23 package.
- Portable Instrumentation
- Rail-to-Rail Buffer Amplifiers
- Low Voltage Signal Processing
- Driving A/D Converters
- Battery-Powered Systems
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.
Tools & Simulations
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.
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Models for the following parts are available in LTspice:
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.