l4925l STMicroelectronics, l4925l Datasheet - Page 7

• Manufacturer Part Number: l4925l
• Description: Very Low Drop Voltage Regulator
• Manufacturer: STMicroelectronics

L4925
3
3.1
Functional description
The L4925 is a monolithic integrated voltage regulator, based on the STM modular voltage
regulator approach. Several outstanding features and auxiliary functions are implemented to
meet the requirements of supplying microprocessor systems in automotive applications.
Nevertheless, it is suitable also in other applications where the present functions are required.
The modular approach of this device allows to get easily also other features and functions when
required.
Voltage regulator
The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating
element. With this structure very low dropout voltage at currents up to 500mA is obtained.
Figure 4.
The dropout operation of the standby regulator is maintained down to 3V input supply voltage.
The output voltage is regulated up to the transient input supply voltage of 35V. With this feature
no functional interruption due to overvoltage pulses is generated.
The typical curve showing the standby output voltage as a function of the input supply voltage is
shown in
The current consumption of the device (quiescent current) is less than 250µA. To reduce the
quiescent current peak in the undervoltage region and to improve the transient response in this
region, the dropout voltage is controlled.
Figure 5.
Foldback Characteristics Of Vo
3 Functional description
7/15