L4995J STMicroelectronics, L4995J Datasheet - Page 17

• Manufacturer Part Number: L4995J
• Description: IC REG LDO 5V 500MA POWERSSO-12
• Manufacturer: STMicroelectronics

Specifications of L4995J

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 5.6 ~ 31 V
• Voltage - Dropout (typical): 0.27V @ 400mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Current - Limit (min): 600mA
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSSO-12
• Number Of Outputs: 1
• Polarity: Positive
• Output Voltage: 5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.5 V at 400 mA
• Output Current: 500 mA
• Line Regulation: 25 mV
• Load Regulation: 25 mV
• Voltage Regulation Accuracy: 2 %
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L4995
3.2
Reset
The reset circuit supervises the output voltage V
the in-ternal reference voltage and a resistor output divider. If the output voltage becomes
lower than V
guaranteed for an output voltage V
When the output voltage becomes higher than V
This delay is obtained by an internal oscillator.
The oscillator period is given by:
Equation 1
where:
t
Equation 2
Reset is active when E
Figure 28. Reset timing diagram
rd
is given by:
Wi
Wi
Vo
Vo
Res
Res
Vcr
Vcr
I
I
V
divider
C
cr
dr
Rhth
tr
:is an internally generated charge current
:is an internally generated discharge current
:is an external capacitance.
, V
o_th
Rlth
< trr
< trr
T
then R
:are two voltages defined with the output voltage and a resistor output
osc
= [(V
n
es
is high.
Rhth
goes low with a reaction time t
t
-V
rd
Doc ID 13103 Rev 10
Rlth
trr
trr
= (V
o
) x C
Rhth
greater than 1V.
tr
x C
] / I
Tosc
Tosc
cr
tr
)/I
+ [(V
cr
o
o_th
. The V
+ 3 x T
trd
trd
Rhth
then R
-V
osc
rr
o_th
Rlth
. The reset low signal is
es
) x C
reset threshold is defined with
goes high with a delay t
tr
] / I
Application information
dr
Vrhth
Vrhth
Vrlth
Vrlth
Vout_th
Vout_th
rd
17/34
.