L7986TA STMicroelectronics, L7986TA Datasheet - Page 38

• Manufacturer Part Number: L7986TA
• Description: 3A step-down switching regulator
• Manufacturer: STMicroelectronics

Specifications of L7986TA

• Low Dropout Operation: 100% duty cycle

Application ideas
38/43
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). Thus if the output is -5 V the input voltage can range from 4.5 V to 33 V.
As in the positive buck-boost, the maximum output current according to application
conditions is shown in
the duty cycles given by
power MOSFET are taken into account.
Equation 43
Figure 36. Maximum output current according to switch max peak current (3.0 A):
V
O
=-5 V
Figure
Equation
36. The dashed line considers a more accurate estimation of
Doc ID 022098 Rev 1
D
43, where power losses across diodes and the internal
=
---------------------------------------------------------------- -
–
V
IN
–
V
V
OUT
SW
+
–
V
V
OUT
D
–
V
D
L7986TA