L6986H datasheet(20/68 Pages) STMICROELECTRONICS

部件名	L6986H

功能描述	38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current

PDF	68 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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20 / 68 page

Figure 15. Normalized RDS(on),HS variation

-2%

-1%

10 12 14 16 18 20 22 24 26 28 30 32 34 36 38

VIN [V]

RDS(on),HS @ I

OUT =1A (normalized @ VIN =12V)

4.8

Light-load operation

The MLF pinstrapping during the power-up phase determines the light-load operation (refer to Table 7. LNM/ LCM

selection (L6986H3V3) and Table 8. LNM/ LCM selection (L6986H5V)).

4.8.1

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 skips pulses and it operates in continuous conduction mode

(CCM) over the different loading conditions, thus making this operation mode ideal for noise sensitive

applications.

L6986H

Light-load operation

DS12905 - Rev 2

page 20/68

L6986H 数据表(PDF) 20 Page - STMicroelectronics