explain

TPS43350-Q1 and TPS43351-Q1 contain two current mode synchronous step-down controllers designed for on-board applications in harsh environments. This device is very suitable for multi rail systems that require low quiescent current because they operate in a low power consumption mode (current consumption is only 30 µ A) under light load.

This device provides protection features such as overheat protection, soft start, and overcurrent protection. In the case of a short circuit at the voltage regulator output, the current turn back characteristic is activated, which limits the current flowing through the metal oxide semiconductor field effect transistor (MOSFET) (used to control power dissipation). Two independent soft start inputs can independently realize output voltage slow rise during startup.

The programmable range of switching frequency is between 150kHz and 600kHz, that is, the frequency of the external clock to which the device can be synchronized. In addition, TPS43351-Q1 provides frequency hopping and spreading operations.

Characteristics of TPS43351-Q1

Meet the requirements of automobile application

AEC-Q100 test guidelines with the following results:

Device temperature class 1: ambient operating temperature range from - 40 ° C to 125 ° C

Device manikin (HBM) Electrostatic discharge (ESD) Classification grade H2

Device HBM Charger Device Model (CDM) Classification Class C2

Two synchronous step-down controllers

Input voltage range up to 40V (transient voltage up to 60V)

Low power consumption mode IQ: 30 µ A (one step-down regulator is open), 35 µ A (two step-down regulators are open)

Low turn off current Ish<4 µ A

Reduced voltage output range 0.9V to 11V

Programmable frequency and external synchronization range is 150kHz to 600kHz

Independent enable input (ENA, ENB)

Frequency spread (TPS43351-Q1)

Under light load, forced continuous mode or automatic low power consumption mode can be selected

Inductive resistor or inductor DCR sensing

Out of phase switching between step-down channels

Peak gate drive current 1.5A

Heat resistant enhanced, 38 pin heat dissipation thin small outline package (DAP) PowerPad package

Scope of application

In vehicle infotainment, navigation and dashboard systems

Multi rail DC power distribution system and electronic control unit for industry or automobile