TLD5098EL_15 Datasheet, PDF (19/41 Pages) Infineon Technologies AG – Multitopology LITIX Power DC/DC Controller IC

Infineon® LITIX™ Power
TLD5098EL
Linear Regulator
8
Linear Regulator
Description
The internal linear voltage regulator supplies the internal gate drivers with a typical voltage of 5 V and current
up to I_LIM,min (parameter 8.2.2). An external output capacitor with ESR lower than R_IVCC,ESR (parameter 8.2.5) is
required on pin IVCC for stability and buffering transient load currents. During normal operation the external
MOSFET switches will draw transient currents from the linear regulator and its output capacitor. Proper sizing
of the output capacitor must be considered to supply sufficient peak current to the gate of the external
MOSFET switches.
Integrated Undervoltage Protection for the External Switching MOSFET
An integrated undervoltage reset threshold circuit monitors the linear regulator output voltage (V_IVCC) and
resets the device in case the output voltage falls below the IVCC undervoltage reset switch OFF threshold
(V_IVCC,RTH,d). The undervoltage reset threshold for the IVCC pin helps to protect the external switches from
excessive power dissipation by ensuring the gate drive voltage is sufficient to enhance the gate of an external
logic level n-channel MOSFET.
IN
14
IVCC
1
Linear Regulator
EN / PWMI ¹³
Gate
Drivers
Figure 8-1 Voltage Regulator Block Diagram and Simplified Application Circuit
Data Sheet
19
Revision 1.2
2015-03-12