L7986TA datasheet(38/43 Pages) STMICROELECTRONICS

Part #	L7986TA

Description	3 A step-down switching regulator

PDF	43 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

38 / 43 page

Application ideas

L7986TA

38/43

Doc ID 022098 Rev 3

The GND pin of the device is connected to the output voltage so, given the output voltage,

input voltage range is limited by the maximum voltage the device can withstand across VCC

and GND (38 V). Therefore, if the output is -5 V the input voltage can range from 4.5 V to 33

As in the positive buck-boost, the maximum output current according to application

conditions is shown in Figure 36. The dashed line considers a more accurate estimation of

the duty cycles given by Equation 46, where power losses across diodes and the internal

power MOSFET are taken into account.

Equation 46

Figure 36.

Maximum output current according to switch max. peak current (3.0 A):

VO=-5 V

OUT

–

OUT

–

--------------------------------------------------------------------

L7986TA Datasheet(PDF) 38 Page - STMicroelectronics