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MAX9634 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX9634 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page 1µA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier 6 _______________________________________________________________________________________ Detailed Description The MAX9634 unidirectional high-side, current-sense amplifier features a 1.6V to 28V input common-mode range. This feature allows the monitoring of current out of a battery with a voltage as low as 1.6V. The MAX9634 monitors current through a current-sense resistor and amplifies the voltage across that resistor. The MAX9634 is a unidirectional current-sense amplifier that has a well-established history. An op amp is used to force the current through an internal gain resistor at RS+, which has a value of R1, such that its voltage drop equals the voltage drop across an external sense resis- tor, RSENSE. There is an internal resistor at RS- with the same value as R1 to minimize offset voltage. The cur- rent through R1 is sourced by a high-voltage p-channel FET. Its source current is the same as its drain current, which flows through a second gain resistor, ROUT. This produces an output voltage, VOUT, whose magnitude is ILOAD x RSENSE x ROUT/R1. The gain accuracy is based on the matching of the two gain resistors R1 and ROUT (see Table 1). Total gain = 25V/V for the MAX9634T, 50V/V for the MAX9634F, 100V/V for the MAX9634H, and 200V/V for the MAX9634W. The output is protected from input overdrive by use of an output current-limiting circuit of 7mA (typical) and a 6V clamp protection circuit. Applications Information Choosing the Sense Resistor Choose RSENSE based on the following criteria: Voltage Loss A high RSENSE value causes the power-source voltage to drop due to IR loss. For minimal voltage loss, use the lowest RSENSE value. GAIN (V/V) R1 ( Ω) ROUT (k Ω) 200 100 20 100 100 10 50 200 10 25 400 10 Table 1. Internal Gain-Setting Resistors (Typical Values) Typical Operating Circuit VBATT = 1.6V TO 28V RSENSE R1 ILOAD ROUT R1 GND OUT P MAX9634 RS+ RS- ADC LOAD µC VDD = 3.3V 10k Ω |
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