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OUT

LIM

Figure 8-2. Transient Current Limit Waveform

8.3.1.1 Adjusting the current limit

The current limit is adjusted by connecting an external resistor from the ILIM pin to GND. The current limit

resistor can be chosen using the equation:

ILIM = 1.18 × (RILIM)-1.072

(1)

8.3.2 Reverse Current Blocking (RCB)

In a scenario where the device is enabled and VOUT is greater than VIN, there is potential for reverse current to

flow through the pass FET or the body diode. When the reverse current threshold is exceeded (about 900 mA),

there is a delay time (tRCB) before the switch turns off to stop the current flow. The switch will remain off and

block reverse current as long as the reverse voltage condition exists. Once VOUT has dropped below the release

voltage threshold (VRCB) the device will turn back on. When the ON pin is pulled low, the device will constantly

block reverse current.

8.4 Device Functional Modes

The tables below summarize the Device Functional Modes.

Table 8-1. Output Connection Table

Fault Condition

VOUT State

FLT State

N/A

Hi-Z

None

VIN (via RON)

Hi-Z

Output Short

Current Limited

Hi-Z

Thermal Shutdown

Hi-Z

Reverse Current

Hi-Z

Table 8-2. Smart-ON Functional Modes (RPD,ON)

ON Pin

≤ VIL

Pull Down Active

≥ VIH

No Pull Down

TPS22950

SLVSFJ2 – DECEMBER 2020

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