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L4925PD-L4925PD013TR
VERY LOW DROP VOLTAGE REGULATOR
L4925VERY LOW DROP VOLTAGE REGULATOR
OPERATING DC SUPPLY VOLTAGE RANGE
6V TO 28V
TRANSIENT SUPPLY VOLTAGE UP TO 40V
EXTREMELY LOW QUIESCENT CURRENT
HIGH PRECISION OUTPUT VOLTAGE
OUTPUT CURRENT CAPABILITY UP TO
500mA
VERY LOW DROPOUT VOLTAGE LESS
THAN 0.6V
RESET CIRCUIT SENSING THE OUTPUT
VOLTAGE
PROGRAMMABLE RESET PULSE DELAY
WITH EXTERNAL CAPACITOR
THERMAL SHUTDOWN AND SHORT CIR-
CUIT PROTECTIONS
DESCRIPTIONThe L4925 is a monolithic integrated 5V voltage
regulator with a very low dropout output and addi-
tional functions such as power-on reset and pro-
grammable reset delay time. It is designed for
supplying microcomputer controlled systems es-
pecially in automotive applications.
BLOCK DIAGRAM
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGSNOTE:
The circuit is ESD protected according to MIL-STD-883C. According to ISO/DIS 7637 the transients must be clamped with external circuitry
(see Application Circuit).
THERMAL DATA
L49252/8
ELECTRICAL CHARACTERISTICS (VS =14V Tj =–40 to 125°C unless otherwise specified;
RESET
APPLICATION CIRCUIT DIAGRAMFor stability: CS > 1μF; CO > 10μF;ESR < 2.5Ω at 10 KHz
Recommended for application: CS =CO = 10μF to 100μF
L49253/8
APPLICATION NOTESUPPLY VOLTAGE TRANSIENTS
High supply voltage transients can cause a reset
output signal disturbation.
For supply voltage greater than 8V the circuit
shows a high immunity of the reset output against
supply transients of more than 100V/μs.
For supply voltage lower than 8V, supply tran-
sients of more than 0.4V/μs. can cause a reset
signal disturbation.
Foldback Characteristics Of Vo
FUNCTIONAL DESCRIPTIONThe 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.
Nevetrheless, it is suitable also in other applica-
tions where the present functions are required.
The modular approach of this device allows to get
easily also other features and functions when re-
quired.
VOLTAGE REGULATORThe 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.
The dropout operation of the standby regulator is
maintained down to 3V input supply voltage. The
output voltage is regulated up to the transient in-
put 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 fig. 1.
The current consumption of the device (quiescent
current) is less than 250μA.
To reduce the quiescent current peak in the un-
dervoltage region and to improve the transient re-
sponse in this region, the dropout voltage is con-
trolled.
The quiescent current as a function of the supply
input voltage is shown in fig. 2.
Figure 1: Output Voltage vs. Input Voltage Figure 2: Quiescent Current vs. Supply Voltage
L49254/8
RESET CIRCUITThe block circuit diagram of the reset circuit is
shown in Figure 3. The reset circuit supervises
the output voltage. The reset threshold of 4.5V is
defined with the internal reference voltage and
standby output divider.
The reset pulse delay time tRD, is defined with the
charge time of an external capacitor CT:
tRD= CT x 2V
2μA
The reaction time of the reset circuit originates
from the discharge time limitation of the reset ca-
pacitor 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 be-
low the reset threshold only a bit longer than the
reaction time results in a shorter reset delay time.
The nominal reset delay time will be generated for
standby output voltage drops longer than approxi-
mately 50μs. The typical reset output waveforms
are shown in Figure 4.
Figure 3
Figure 4
L49255/8
L49256/8
