Description

The Microchip Technology Inc. MCP6001/2/4 family 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 a 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 MCP6001/2/4 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 MCP6001/2/4 family is available in the industrial and extended temperature ranges, with a power supply range of 1.8V to 6.0V.

 

Caractéristiques

• Available in 5-Lead SC-70 and 5-Lead SOT-23 Packages
• Gain Bandwidth Product: 1MHz (typical)
• Rail-to-Rail Input/Output
• Supply Voltage: 1.8V to 6.0V
• Supply Current: IQ = 100µA (typical)
• Phase Margin: 90° (typical)
• Temperature Range:
– Industrial: -40°C to +85°C
– Extended: -40°C to +125°C
• Available in Single, Dual and Quad Packages

 

Applications

• Automotive
• Portable Equipment
• Photodiode Amplifier
• Analog Filters
• Notebooks and PDAs
• Battery-Powered Systems

 

Design Aids

• SPICE Macro Models
• FilterLab® Software
• Mindi™ Circuit Designer and Analog Simulator
• Microchip Advanced Part Selector (MAPS)
• Analog Demonstration and Evaluation Boards
• Application Notes

 

Power Supply Pins

The positive power supply (VDD) is 1.8V to 6.0V higher than the negative power supply (VSS). For normal operation, the other pins are at voltages between VSS and VDD.
Typically, these parts are used in a single (positive) supply configuration. In this case, VSS is connected to ground and VDD is connected to the supply. VDD will need bypass capacitors.

 

APPLICATION INFORMATION

The MCP6001/2/4 family of op amps is manufactured using Microchip’s state-of-the-art CMOS process and is specifically designed for low-cost, low-power and general purpose applications. The low supply voltage, low quiescent current and wide bandwidth makes the MCP6001/2/4 ideal for battery-powered applications. These devices have high phase margin, which makes them stable for larger capacitive load applications.

 

INPUT VOLTAGE AND CURRENT LIMITS

This structure was chosen to protect the input transistors and to minimize Input Bias (IB) current. The input ESD diodes clamp the inputs when they try to go more than one diode drop below VSS. They also clamp any voltages that go too far above VDD; their breakdown voltage is high enough to allow normal operation and low enough to bypass quick ESD events within the specified limits.
The resistors then serve as inrush current limiters; the DC current into the input pins (VIN+ and VIN-) should be very small. A significant amount of current can flow out of the inputs when the Common-Mode Voltage (VCM) is below ground (VSS). Applications that are high-impedance may need to limit the usable voltage range.

 

NORMAL OPERATION

The input stage of the MCP6001/1R/1U/2/4 op amps use two differential CMOS input stages in parallel. One operates at low Common-mode input voltage (VCM), while the other operates at high VCM. With this topology, the device operates with VCM up to 0.3V above VDD and 0.3V below VSS.
The transition between the two input stages occurs when VCM = VDD – 1.1V. For the best distortion and gain linearity, with noninverting gains, avoid this region of operation.

 

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.