l4949eptr-e STMicroelectronics, l4949eptr-e Datasheet - Page 10

• Manufacturer Part Number: l4949eptr-e
• Description: Multifunction Very Low Drop Voltage Regulator
• Manufacturer: STMicroelectronics

Application information
3
Figure 3.
1. For stability: C
3.1
3.2
10/19
Application information
Application circuit
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 L4949ED-E and L4949EP-E are 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
S
≥ 1µF, C
O
≥ 4.7µF, ESR < 10Ω at 10KHz. Recommended for application: C
(1)
Doc ID 16823 Rev 1
S
= C
L4949ED-E, L4949EP-E
O
= 10 µF to 100 µF
Z
can