L4925 STMicroelectronics, L4925 Datasheet - Page 9

• Manufacturer Part Number: L4925
• Description: IC REG LDO 5V PENTAWATT
• Manufacturer: STMicroelectronics

Specifications of L4925

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 6 ~ 28 V
• Voltage - Dropout (typical): 0.3V @ 500mA
• Number Of Regulators: 1
• Current - Output: 500mA
• Current - Limit (min): 550mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: Pentawatt-5 (Vertical, Bent and Staggered Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3911

L4925
3.2
Figure 4.
Figure 5.
Reset circuit
The block circuit diagram of the reset circuit is shown in
supervises the output voltage. The reset threshold of 4.5 V is defined with the internal
reference voltage and standby output divider. The reset pulse delay time t
the charge time of an external capacitor CT:
The reaction time of the reset circuit originates from the discharge time limitation of the reset
capacitor CT and it is proportional to the value of CT. The reaction time of the reset circuit
increases the noise immunity. Standby output voltage drops below the reset threshold only a
bit longer than the reaction time results in a shorter reset delay time.
The nominal reset delay time is generated for standby output voltage drops longer than
approximately 50 ms. The typical reset output waveforms are shown in
t
RD
=
C
-------------------
2μA
T
⋅
2V
Output voltage vs input voltage
Quiescent current vs supply voltage
Doc ID 1770 Rev 7
Figure
6. The reset circuit
Functional description
Figure
RD
, is defined with
7.
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