INA180B2IDBVT datasheet(27/53 Pages) TI2

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IN±

IN+

GND

OUT

Single-Channel

TI Device

2.7 V to 5.5 V

Output

RPROTECT

< 10

RSENSE

Bus Supply

±0.2 V to +26 V

Load

CBYPASS

0.1 µF

Figure 9-5. Transient Protection Using Dual Zener Diodes

In the event that low-power Zener diodes do not have sufficient transient absorption capability, a higher-power

transzorb must be used. The most package-efficient solution involves using a single transzorb and back-to-back

diodes between the device inputs, as shown in Figure 9-6. The most space-efficient solutions are dual, series-

connected diodes in a single SOT-523 or SOD-523 package. In either of the examples shown in Figure 9-5 and

Figure 9-6, the total board area required by the INAx180 with all protective components is less than that of an

SO-8 package, and only slightly greater than that of an MSOP-8 package.

Transorb

Output

IN±

IN+

GND

OUT

< 10

2.7 V to 5.5 V

CBYPASS

0.1 µF

RSENSE

Bus Supply

±0.2 V to +26 V

Load

Single-Channel

TI Device

Figure 9-6. Transient Protection Using a Single Transzorb and Input Clamps

For a reference design example, see Current Shunt Monitor With Transient Robustness Reference Design.

9.4 Layout

9.4.1 Layout Guidelines

• Connect the input pins to the sensing resistor using a Kelvin or 4-wire connection. This connection technique

makes sure that only the current-sensing resistor impedance is detected between the input pins. Poor routing

of the current-sensing resistor commonly results in additional resistance present between the input pins.

Given the very low ohmic value of the current resistor, any additional high-current carrying impedance can

cause significant measurement errors.

• Place the power-supply bypass capacitor as close as possible to the device power supply and ground pins.

The recommended value of this bypass capacitor is 0.1 µF. Additional decoupling capacitance can be added

to compensate for noisy or high-impedance power supplies.

• When routing the connections from the current sense resistor to the device, keep the trace lengths as close

as possible in order to minimize any impedance mismatch.

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INA180, INA2180, INA4180

SBOS741H – APRIL 2017 – REVISED JULY 2022

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