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MC33503SNT1G bảng dữ liệu(PDF) 6 Page - ON Semiconductor |
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MC33503SNT1G bảng dữ liệu(HTML) 6 Page - ON Semiconductor |
6 / 14 page MC33501, MC33503 http://onsemi.com 6 General Information The MC33501/503 dual operational amplifier is unique in its ability to provide 1.0 V rail−to−rail performance on both the input and output by using a SMARTMOS t process. The amplifier output swings within 50 mV of both rails and is able to provide 50 mA of output drive current with a 5.0 V supply, and 10 mA with a 1.0 V supply. A 5.0 MHz bandwidth and a slew rate of 3.0 V/ ms is achieved with high speed depletion mode NMOS (DNMOS) and vertical PNP transistors. This device is characterized over a temperature range of −40 °C to 105°C. Circuit Information Input Stage One volt rail−to−rail performance is achieved in the MC33501/503 at the input by using a single pair of depletion mode NMOS devices (DNMOS) to form a differential amplifier with a very low input current of 40 fA. The normal input common mode range of a DNMOS device, with an ion implanted negative threshold, includes ground and relies on the body effect to dynamically shift the threshold to a positive value as the gates are moved from ground towards the positive supply. Because the device is manufactured in a p−well process, the body effect coefficient is sufficiently large to ensure that the input stage will remain substantially saturated when the inputs are at the positive rail. This also applies at very low supply voltages. The 1.0 V rail−to−rail input stage consists of a DNMOS differential amplifier, a folded cascode, and a low voltage balanced mirror. The low voltage cascaded balanced mirror provides high 1st stage gain and base current cancellation without sacrificing signal integrity. A common mode feedback path is also employed to enable the offset voltage to track over the input common mode voltage. The total operational amplifier quiescent current drop is 1.3 mA/amp. Output Stage An additional feature of this device is an “on demand” base current cancellation amplifier. This feature provides base drive to the output power devices by making use of a buffer amplifier to perform a voltage−to−current conversion. This is done in direct proportion to the load conditions. This “on demand” feature allows these amplifiers to consume only a few micro−amps of current when the output stage is in its quiescent mode. Yet it provides high output current when required by the load. The rail−to−rail output stage current boost circuit provides 50 mA of output current with a 5.0 V supply (For a 1.0 V supply output stage will do 10 mA) enabling the operational amplifier to drive a 600 W load. A buffer is necessary to isolate the load current effects in the output stage from the input stage. Because of the low voltage conditions, a DNMOS follower is used to provide an essentially zero voltage level shift. This buffer isolates any load current changes on the output stage from loading the input stage. A high speed vertical PNP transistor provides excellent frequency performance while sourcing current. The operational amplifier is also internally compensated to provide a phase margin of 60 degrees. It has a unity gain of 5.0 MHz with a 5.0 V supply and 4.0 MHz with a 1.0 V supply. Low Voltage Operation The MC33501/503 will operate at supply voltages from 0.9 to 7.0 V and ground. When using the MC33501/503 at supply voltages of less than 1.2 V, input offset voltage may increase slightly as the input signal swings within approximately 50 mV of the positive supply rail. This effect occurs only for supply voltages below 1.2 V, due to the input depletion mode MOSFETs starting to transition between the saturated to linear region, and should be considered when designing high side dc sensing applications operating at the positive supply rail. Since the device is rail−to−rail on both input and output, high dynamic range single battery cell applications are now possible. |
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Mô tả tương tự - MC33503SNT1G |
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