L4949ED STMicroelectronics, L4949ED Datasheet - Page 10

• Manufacturer Part Number: L4949ED
• Description: IC VREG VLDO MULTIFUNCT SO-8
• Manufacturer: STMicroelectronics

Specifications of L4949ED

• 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: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 28 V
• Output Voltage: 5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.5 V
• Output Current: 100 mA
• Line Regulation: 20 mV
• Load Regulation: 30 mV
• Voltage Regulation Accuracy: 1 %
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 1.23 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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