L4949E STMicroelectronics, L4949E Datasheet - Page 10

• Manufacturer Part Number: L4949E
• Description: IC REG VOLT LDO MULTIFUNCT 8-DIP
• Manufacturer: STMicroelectronics

Specifications of L4949E

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: Up to 28V
• Voltage - Dropout (typical): 0.3V @ 100mA
• Number Of Regulators: 1
• Current - Output: 100mA
• Current - Limit (min): 120mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3631

Application information
3
Figure 3.
3.1
3.2
10/19
Application information
Application circuit
1. For stability: C
Supply voltage transient
High supply voltage transients can cause a reset output signal disturbance. For supply
voltages greater than 8V the circuit shows a high immunity of the reset output against supply
transients of more than 100V/µs. For supply voltages less than 8V supply transients of more
than 0.4V/µs can cause a reset signal disturbance.
To improve the transient behaviour for supply voltages less than 8V a capacitor at pin V
be used.
This capacitor (C3 ≤ 1 µF) reduces also the output noise.
Functional description
The L4949E 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
Recommended for application: C
S
≥ 1µF, C
(1)
O
≥ 4.7µF, ESR < 10Ω at 10KHz
S
Doc ID 4275 Rev 6
= C
O
= 10 µF to 100 µF
L4949E
Z
can