L6935 STMicroelectronics, L6935 Datasheet - Page 15

• Manufacturer Part Number: L6935
• Description: High performance 3 A ULDO linear regulator
• Manufacturer: STMicroelectronics

Specifications of L6935

• Adjustable Output Voltage: 0.5 V to 3.0 V
• Excellent Load And Line Regulation: 1 % accuracy (over temperature)

Application information
6.2
15/20
VIN, VBIAS and sequencing
Different configurations for VIN and VBIAS are possibleand the power sequencing must
consider the different timings in which the power suppliesbecomes available. In order to
properly drive the device internal logic, it is reccomendedto control the sequence between
EN signal and the VIN / VBIAS application: the device need to result being disabled when
VBIAS crosses the UVLO threshols. Furthermore, in case of VIN <> VBIAS, the EN signal
needs to be driven by the last-coming between the two supplies.
It is reccomended to drive the EN pin with a resistor divider connected as reported into
Figure 13
Figure 13. Recommended circuit for VBIAS = VIN
Figure 14. Reccomended circuit for VBIAS
(OpenDrain Toggle **)
(OpenDrain Toggle **)
VIN (< VBIAS)
and
C
VBIAS
IN
VIN
EN
EN
C
** Drive EN with external Open-Drain Signal.
IN
* EN Divider (R
** Drive EN with external Open-Drain Signal.
Figure
14.
EH
) needs to be connected to the Last-Coming rail between VCC and VIN.
R
R
EH
EL
R
EL
VIN
EN
SS
VIN
EN
SS
C
SS
C
L6935
SS
GND
VBIAS
L6935
GND
VBIAS
PAD
PAD
≠
PGOOD
VIN
VOUT
PGOOD
ADJ
VOUT
ADJ
R
R
1
2
R
R
1
2
R
VOUT = 0.5V to 3.0V
PG
R
VOUT = 0.5V to 3.0V
PG
C
OUT
C
PGOOD
OUT
PGOOD
L6935