L99VR02XP datasheet(5/50 Pages) STMICROELECTRONICS

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Pin name

Function

Wi_LDO1

Watchdog refresh input for LDO1.

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

Vcw_LDO1

Watchdog timer adjust for LDO1.

A capacitor between Vcw_LDO1 pin and GND sets the time response of the watchdog monitor.

TW_LDO1

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 TW_LDO1 output. Leave

floating if not used.

TC_CONF

Thermal shutdown configuration

TRK_STAT

Output pin.

To indicate if LDO2 is in tracking mode.

TW_LDO2

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_LDO2 output. Leave floating if

not used.

Vcw_LDO2

Watchdog timer adjust for LDO2.

A capacitor between Vcw_LDO2 pin and GND sets the time response of the watchdog monitor.

Wi_LDO2

Watchdog refresh input for LDO2.

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

IShort_LDO2

Programmable short circuit output current input pin for LDO2. A resistor between IShort_LDO2 pin and GND

sets the short circuit output current value

GND

Ground reference

Vcr_LDO2

Reset timing adjust for LDO2.

A capacitor between Vcr_LDO2 pin and GND sets the reset delay time (Trd). Leave floating if reset is not

used.

RST_LDO2

Reset output for LDO2.

It is pulled down when output voltage goes below VO_th or frequency at Wi_LDO2 is too low. Leave

floating if not used.

VO_LDO2

Voltage regulator output for LDO2.

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

TRK_MODE Input pin selecting the tracking mode (either from LDO1 or an external regulator)

EN_LDO2

Enable input for LDO2.

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_LDO2 to keep the device always enabled

VS_LDO2

Supply voltage for LDO2.

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

the pin.

SEL3_LDO2

Output voltage selectors for LDO2

SEL2_LDO2

SEL1_LDO2

TAB

The TAB is connected to ground

L99VR02XP

Block diagram and pin description

DS14686 - Rev 1

page 5/50

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