L6983 datasheet(20/63 Pages) STMICROELECTRONICS

Part #	L6983

Description	38 V, 3 A synchronous step-down converter with 17 μA quiescent current

PDF	63 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

20 / 63 page

6.4.4

Load regulation for low consumption mode and Low noise mode part number

Figure 16. Load regulation for LCM and LNM. VIN = 24 V; VOUT = 5 V; FSW = 400 kHz - linear scale and

Figure 17. Load regulation for low noise mode. VIN = 24 V; VOUT = 5 V; FSW = 400 kHz - log scale report the load

regulation to highlight the gap, given by the different regulation strategy, at the light-load between LNM and LCM

part numbers. When the required IOUT is higher than the threshold defined on the Section 6.4.1 Low

consumption mode (LCM) the behavior of the different part number is exactly the same.

Figure 16. Load regulation for LCM and LNM. VIN = 24 V; VOUT = 5 V; FSW = 400 kHz - linear scale

-0.5

0.5

1.5

0.5

1.5

2.5

IOUT [A]

VIN = 24 V ; VOUT = 5 V; FSW = 0.4 MHz

LCM

LNM

Figure 17. Load regulation for low noise mode. VIN = 24 V; VOUT = 5 V; FSW = 400 kHz - log scale

-0.5

0.5

1.5

0.001

0.01

0.1

IOUT [A]

VIN = 24 V; VOUT = 5 V; FSW = 0.4 MHz

LCM

LNM

L6983

Light-load operation

DS13116 - Rev 1

page 20/63

L6983 Datasheet(PDF) 20 Page - STMicroelectronics