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L99VR02XP Folha de dados(PDF) 32 Page - STMicroelectronics

Nome de Peças L99VR02XP
Descrição Electrónicos  Dual automotive linear voltage regulator with configurable output voltage (2x250 mA current capability)
PDF  50 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99VR02XP Folha de dados(HTML) 32 Page - STMicroelectronics

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Tracking mode = 0 → If V(IN_TRK) and all the other conditions are correct OR if V(IN_TRK) is in UV condition but
softstart in ongoing on LDO, the LDO2 is powered un in tracking. Otherwise the power-up is in standalone
regulation mode.
Figure 50. Finite state machine
RAMP in
tracking mode
Stand alone
reg.
RAMP
in stand alone
reg.
LDO2
OFF
Detrack
procedure
Tracking
mode reg.
en LDO2 discharge & wait
for LDO2_UV=1
LDO2_UV=1
ramp elapsed
ramp elapsed
EN=0 OR UVLO
EN=0 OR UVLO
TRK_COND=F
TRK_COND=T
TRK_COND=F
TRK_COND:
*(UV masked during LDO1 soft start)
EN_LDO2=1 &
1) TRK_MODE=1 &
IN_TRK_UV/OV=0
OR
2) TRK_MODE=0 &
SEL_LDO1=SEL_LDO2 &
TSD_LDO1=0 &UVLO VS_LDO1=0 &
IN_TRK_UV/OV=0*
In tracking mode, by LDO1 or an external regulator, in case of thermal shutdown which occurs on L99VR02XP or
LDO1 or undervoltage or overvoltage events detected on IN_TRK pin, LDO2 automatically goes in detracking
mode. In such case LDO2 is switched-off (VO_LDO2 = 0 V) in T_detrk time and resumes with soft start and works
as an independent regulator.
To activate the tracking functionality of the LDO2 again, it is necessary to reactivate the device with the EN.
Before activating LDO2 for tracking functionality, it is important that the reference to be tracked is stable, to avoid
detracking.
Figure 51. Power-up when LDO2 is tracker of LDO1
VO1
VO2
t
Tracking
t
L99VR02XP
Application information
DS14686 - Rev 1
page 32/50



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