L99VR02XP datasheet(4/50 Pages) STMICROELECTRONICS

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1.2

Pin description

Figure 2. Pins configuration (top view)

L99VR02XP

Table 1. Pins description

Pin name

Function

GND

Ground reference

SEL1_LDO1

Output voltage selectors for LDO1

SEL2_LDO1

SEL3_LDO1

VS_LDO1

Supply voltage for LDO1.

Block directly to ground with ceramic capacitor ≥ 4.7 μF and a 100 nF capacitator as close as possible to

the pin.

EN_LDO1

Enable input for LDO1.

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_LDO1 to keep the device always enabled.

IN_TRK

Input pin for the reference voltage in tracking mode, connected to either VO_LDO1 or an external voltage

regulator output.

VO_LDO1

Voltage regulator output for LDO1.

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

RST_LDO1

Reset output for LDO1.

It is pulled down when output voltage goes below VO_th or frequency at Wi_LDO1 is too low. Leave

floating if not used.

Vcr_LDO1

Reset timing adjust for LDO1.

A capacitor between Vcr_LDO1 pin and GND. Sets the reset delay time (Trd). Leave floating if reset is not

used.

GND

Ground reference

IShort_LDO1

Programmable short circuit output current input pin for LDO1. A resistor between IShort_LDO1 pin and GND

sets the short-circuit output current value.

L99VR02XP

Block diagram and pin description

DS14686 - Rev 1

page 4/50

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