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MAX34406 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX34406 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 11 page ���������������������������������������������������������������� Maxim Integrated Products 10 MAX34406 Quad Current-Sense Amplifier with Overcurrent Threshold Comparators RIN x IBIAS contributes to the input voltage offset. IBIAS is typically 0.2FA. Placing RIN at the INx- input voltage does not affect the gain error of the device because the gain is given by the ratio between ROUTx and R1 at INx+. Bidirectional Application Some systems can require a precise bidirectional cur- rent-sense amplifier to accurately monitor currents. Measurement of the two separate outputs with respect to GND yields an accurate measure of the bidirectional currents (Figure 3). Choosing the Delay Capacitor The SHTDN output asserts upon overcurrent detection on any of the 4 channels. OC1 to OC4 are logically ORed together; SHTDN latches the output after some delay. SHTDN latch delay is determined by the following equation: tDLY = CCDLY × (VDD ÷ 10µA) Example CCDLY and tDLY pairs are given in the Electrical Characteristics table. A discharge resistor, RBLEED, with a max resistance of 22mI, should be added in parallel with CCDLY. The delay capacitor integrates overcurrent events over time; a parallel resistor RBLEED allows the capacitor to dis- charge over time, thus limiting the integration period. Accumulated voltage from overcurrent events decay through the bleed resistor with time constant: τ = RBLEED × CCDLY Additionally, discharge of accumulated voltage through RBLEED increases the precision of the SHTDN delay time, tDLY. Figure 3. Bidirectional Application Ordering Information +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *Future product—contact factory for availability. **EP = Exposed pad. Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages.Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGETYPE PACKAGECODE OUTLINENO. LANDPATTERNNO. 24 TQFN-EP T2444+4 21-0139 90-0022 PART GAIN(V/V) TEMPRANGE PIN-PACKAGE MAX34406TETG+* 25 -40NC to +85NC 24 TQFN-EP** MAX34406TETG+T* 25 -40NC to +85NC 24 TQFN-EP** MAX34406FETG+* 50 -40NC to +85NC 24 TQFN-EP** MAX34406FETG+T* 50 -40NC to +85NC 24 TQFN-EP** MAX34406HETG+ 100 -40NC to +85NC 24 TQFN-EP** MAX34406HETG+T 100 -40NC to +85NC 24 TQFN-EP** MAX34406WETG+* 200 -40NC to +85NC 24 TQFN-EP** MAX34406WETG+T* 200 -40NC to +85NC 24 TQFN-EP** IN2+ OUT1 IN2- GND IN1+ IN1- RSENSE ILOAD OUT2 MAX34406 µC ADC INPUTS VDD = 3.3V |
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