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1. Description
The Microchip Technology Inc. MCP6004-I/SL of operational amplifiers (op amps) is specifically designed for general-purpose applications. This family has a 1 MHz Gain Bandwidth Product (GBWP) and 90° phase margin (typical). It also maintains 45° phase margin (typical) with a 500 pF capacitive load. This family operates from a single supply voltage as low as 1.8V, while drawing 100 µA (typical) quiescent current.
Additionally, the MCP6004-I/SL supports rail-to-rail input and output swing, with a common mode input voltage range of VDD + 300 mV to VSS – 300 mV. This family of op amps is designed with Microchip’s advanced CMOS process.
The MCP6004-I/SL family is available in the industrial and extended temperature ranges, with a power supply range of 1.8V to 6.0V.
2. Features
1. Available in SC-70-5 and SOT-23-5 packages
2. Gain Bandwidth Product: 1 MHz (typical)
3. Rail-to-Rail Input/Output
4. Supply Voltage: 1.8V to 6.0V
5. Supply Current: IQ = 100 µA (typical)
6. Phase Margin: 90° (typical)
7. Temperature Range:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
8. Available in Single, Dual and Quad Packages
3. Applications
1. Automotive
2. Portable Equipment
3. Photodiode Amplifier
4. Analog Filters
5. Notebooks and PDAs
6. Battery-Powered Systems
4. Design Aids
1. SPICE Macro Models
2. FilterLab® Software
3. Mindi™ Circuit Designer & Simulator
4. Microchip Advanced Part Selector (MAPS)
5. Analog Demonstration and Evaluation Boards
6. Application Notes
5. Capacitive Loads
Driving large capacitive loads can cause stability problems for voltage feedback op amps. As the load capacitance increases, the feedback loop’s phase margin decreases and the closed-loop bandwidth is reduced. This produces gain peaking in the frequency response, with overshoot and ringing in the step response. While a unity-gain buffer (G = +1) is the most sensitive to capacitive loads, all gains show the same general behavior.
When driving large capacitive loads with these op amps (e.g., > 100 pF when G = +1), a small series resistor at the output improves the feedback loop’s phase margin (stability) by making the output load resistive at higher frequencies. The bandwidth will be generally lower than the bandwidth with no capacitance load.
6. Typical Application
7. Package Types
