A6984 datasheet(28/47 Pages) STMICROELECTRONICS

Numer części	A6984

Szczegółowy opis	36 V, 400 mA automotive synchronous step-down switching regulator

PDF	47 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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Device description

A6984

28/47

DocID030396 Rev 1

4.5.1

Low noise mode (LNM)

Low noise mode implements a forced PWM operation over the different loading conditions.

The LNM features a constant switching frequency to minimize the noise in the final

application and a constant voltage ripple at fixed VIN. The regulator in steady loading

condition never skips pulses and it operates in continuous conduction mode (CCM) over the

different loading conditions.

Figure 19. Low noise mode operation

Typical applications for LNM operation are car audio and sensors.

4.5.2

Low consumption mode (LCM)

The low consumption mode maximizes the efficiency at the light load. As soon as the output

voltage drops, the regulator generates a pulse to have the FB back in regulation. In order to

minimize the current consumption in the LCM part of the internal circuitry is disabled in the

time between bursts.

A6984 Arkusz danych(PDF) 28 Page - STMicroelectronics