The DC-DC converter can perform high-frequency switching action through a controllable switch (MOSFET, etc.), and store the input electric energy in the capacitor (inductor). When the switch is turned off, the electric energy is released to the load to provide energy.
DC stands for a direct current power source, such as a dry cell or a car battery. The 220V power supply for household use is alternating current (AC).
If a DC voltage (3.0V) can be converted into other DC voltages (1.5V or 5.0V) through a converter, we call this converter a DC-DC converter, or a switching power supply or a switching regulator .
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There are three types of DC-DC converters: step-up DC/DC converters, step-down DC/DC converters, and step-down DC/DC converters.
This is a popular car DC-DC power chip L9369-TR：
The L9369-TR chip is the core chip of the electronic stability system (the standard name should be called ESC, and ESP is a Bosch patent, collectively referred to as "ESP" in the text).
ESP stands for Electronic Stabilization System, which is an essential part of high-end cars, especially SUVs. Its main function is to detect and reduce the loss of traction to prevent skidding.
L9369-TR, Dedicated Automotive IC for Electric Parking Brake
Product feature: L9369-TR
The L9369-TR is a high-side and low-side gate driver with a number of features that make it suitable for use in automotive applications. Some of its key features include:
AEC-Q100 qualified, ensuring high reliability and quality for use in automotive environments.
ISO26262 functional safety concepts compliance, making it suitable for use in safety-critical applications.
Four high-side and low-side gate drivers for driving up to eight external power NFETs.
Programmable over-current protection threshold that is independent of the NFET VDS monitoring threshold.
10 integrated fully differential amplifiers with low offset, highly accurate gain, and self-test capability.
10 independent ADC channels for digital motor current and voltage measurements.
32-bit, 10 MHz SPI with CRC for internal settings, self-testing, and diagnostics.
Can drive external power NFETs with a battery input voltage of up to 5.5 V.
Continuous BIST monitoring of the main power supply and internal regulator.
Dual-bandgap reference.
Four general-purpose I/O pins (GPIO).
Button interface with 9 configurable I/O pins for monitoring and diagnosing normal and sleep modes.
Two motor speed sensor (MSS) interfaces for feedback of speed information from external Hall sensors.
System wake-up in sleep mode.
Watchdog timer that can be configured via SPI.
Overall, the L9369-TR is a versatile and reliable gate driver that is well-suited for use in a variety of automotive applications.
