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MAX4372TEUK+T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX4372TEUK+T Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 11 page  _______________Detailed Description The MAX4372 high-side current-sense amplifier fea- tures a 0 to 28V input common-mode range that is inde- pendent of supply voltage. This feature allows the monitoring of current flow out of a battery in deep dis- charge, and also enables high-side current sensing at voltages far in excess of the supply voltage (VCC). Current flows through the sense resistor, generating a sense voltage (Figure 1). Since A1’s inverting input is high impedance, the voltage on the negative terminal equals VIN - VSENSE. A1 forces its positive terminal to match its negative terminal; therefore, the voltage across RG1 (VIN - V1-) equals VSENSE. This creates a current to flow through RG1 equal to VSENSE / RG1. The transistor and current mirror amplify the current by a factor of β. This makes the current flowing out of the current mirror equal to: IM = β VSENSE / RG1 A2’s positive terminal presents high impedance, so this current flows through RGD, with the following result: V2+ = RGD β ·· VSENSE / RG1 R1 and R2 set the closed-loop gain for A2, which ampli- fies V2+, yielding: VOUT = RGD ·· β ·· VSENSE / RG1 (1 + R2 / R1) The gain of the device equals: VOUT = RGD ·· β (1 + R2 / R1) / RG1 VSENSE __________Applications Information Recommended Component Values The MAX4372 operates over a wide variety of current ranges with different sense resistors. Table 1 lists com- mon resistor values for typical operation of the MAX4372. Choosing RSENSE Given the gain and maximum load current, select RSENSE such that VOUT does not exceed VCC - 0.25V or 10V. To measure lower currents more accurately, use a high value for RSENSE. A higher value develops a higher sense voltage, which overcomes offset voltage errors of the internal current amplifier. In applications monitoring very high current, ensure RSENSE is able to dissipate its own I 2R losses. If the resistor’s rated power dissipation is exceeded, its value may drift or it may fail altogether, causing a differential voltage across the terminals in excess of the absolute maximum ratings. Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output MAX4372T/F/H GND TO LOAD VIN 0 TO 28V 2.7V TO 28V R1 RGD RG2 100k Ω RS+ RS- RG1 100k Ω R2 OUT V2+ V1+ V1- V2- VCC RSENSE ILOAD IM VSENSE CURRENT MIRROR A1 A2 Pin/Bump Description 1 3 Ground 2 4 Output Voltage. VOUT is proportional to the magnitude of VSENSE (VRS+ - VRS-). A2 A3 SO FUNCTION SOT23 UCSP 3 1 Supply Voltage. Use at least a 0.1µF capacitor to decouple VCC from fast transients. 4 8 Power Connection to the External Sense Resistor A1 B1 5 6 Load-Side Connection to the External Sense Resistor — 2, 5, 7 No Connection. Not internally connected. B3 — GND OUT NAME VCC RS+ RS- N.C. PIN BUMP Figure 1. Functional Diagram 6 Maxim Integrated MAX4372T/F/H |
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