AAT4610AIJS-T1 datasheet(8/11 Pages) AAT

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Application Information

Setting Current Limit

In most applications, the variation in ILIM must be

taken into account when determining RSET. The ILIM

variation is due to processing variations from part

to part, as well as variations in the voltages at IN

and OUT, plus the operating temperature. See

charts "Current Limit vs. Temperature" and "Output

Current vs. VOUT." Together, these three factors

add up to a ±25% tolerance (see ILIM specification

in Electrical Characteristics section). Figure 1 illus-

trates a cold device with a statistically higher cur-

rent limit and a hot device with a statistically lower

current limit, both with RSET equal to 10.5kΩ. While

the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A

with an RSET of 10.5kΩ, this figure shows that the

actual current limit will be at least 0.525A and no

greater than 0.880A.

Figure 1: Current Limit Using 10.5k

Ω.

To determine RSET, start with the maximum current

drawn by the load and multiply it by 1.33 (typical

ILIM = minimum ILIM / 0.75). This is the typical cur-

rent limit value. Next, refer to "RSET vs. ILIM" and

find the RSET that corresponds to the typical current

limit value. Choose the largest resistor available

that is less than or equal to it. For greater precision,

the value of RSET may also be calculated using the

0.2

0.4

0.6

0.8

1.2

VOUT (V)

0.88A

0.525A

Device with high current limit at -40

°C

Device with low current limit at 85

°C

AAT4610A

Current Limited Load Switch

4610A.2006.9.1.3

Functional Block Diagram

Current

Limit

1.2V

Reference

Under-

Voltage

Lockout

Over-Temperature

Protection

OUT

SET

GND

SET

ON (ON)

AAT4610AIJS-T1 Datasheet(PDF) 8 Page - Advanced Analog Technology, Inc.

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