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A6985F Datasheet(PDF) 25 Page - STMicroelectronics

Part # A6985F
Description  38 V 500 mA synchronous step-down switching regulator
PDF  77 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6985F Datasheet(HTML) 25 Page - STMicroelectronics

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A6985F
Functional description
77
5.5
Light-load operation
The MLF pinstrapping during the power-up phase determines the light-load operation (refer
to Table 7 on page 11, Table 8 and Table 9 on page 12).
5.5.1
Low noise mode (LNM)
The 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 skip pulses and it operates in continuous conduction mode (CCM) over the
different loading conditions.
Figure 13. Low noise mode operation
Typical applications for the LNM operation are car audio, sensors.



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