L99VR02JTR datasheet(4/38 Pages) STMICROELECTRONICS

4 / 38 page

Table 1. Pins description

Pin name

PowerSSO-12 pin

Function

Supply voltage.

Block directly to the ground with ceramic capacitor ≥ 4.7 µF and a 100 nF

capacitator as close as possible to the pin

SEL1

Output voltage selectors.

SEL2

SEL3

Advanced thermal warning output.

If the device detects a junction temperature above the warning threshold, the pin is

pulled low. If an overvoltage condition occurs, a square wave is provided through

the TW output. Leave floating if not used.

IShort

Programmable short circuit output current input pin. A resistor between Ishort pin

and GND sets the short circuit output current value.

Enable input:

•

With the enable high: Regulator, watchdog, and reset are operating

•

With the enable low: Regulator, watchdog, and reset are shutdown, while the

fast discharge circuit is turned on

Connect the enable to VS to keep the device always enabled

GND

Ground reference.

VCW

Watchdog timer adjusts.

A capacitor between VCW pin and GND sets the time response of the watchdog

monitor.

Watchdog refresh input.

If the square wave frequency at this input pin is too low, a low pulse at an RST pin

is generated.

RST

Reset output.

It is pulled down when the output voltage goes below Vo_th or the frequency at Wi

is too low. Leave floating if not used.

Voltage regulator output.

Block to ground with a capacitor ≥ 3.3 µF (needed for regulator stability).

TAB

Connected to ground

Figure 2. Pins configuration

PowerSSO-12

L99VR02J

Block diagram and pins description

DS14076 - Rev 1

page 4/38

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