AAT4610 datasheet(8/10 Pages) AAT

8 / 10 page

AAT4610

Current Limited Load Switch

Not recommended for new designs; pin-for-pin upgrade: AAT4610A.

4610.2006.09.1.3

Functional Block Diagram

Current

Limit

1.2V

Reference

Under-

Voltage

Lockout

Over-Temperature

Protection

OUT

SET

GND

SET

ON (ON)

Applications 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

(Pin 5) and OUT (Pin 1), plus the operating tem-

perature. See the charts "Current Limit vs.

Temperature" and "Output Current vs. VOUT" in the

Typical Characteristics section of this datasheet.

Together, these three factors add up to a ±25% tol-

erance (see ILIM specification in the Electrical

Characteristics section of this datasheet). Figure 1

shows 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: Output Current Using 10.5k

Ω.

To determine RSET, start with the maximum current

drawn by the load, and multiply it by 1.33 (typi-

cal_ILIM = minimum_ILIM / 0.75). This is the typical

current 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,

0.2

0.4

0.6

0.8

1.2

234

VOUT (V)

0.88A

0.525A

Device with high current limit at -40

°C

Device with low current limit at 85

°C

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