PM6686 STMicroelectronics, PM6686 Datasheet - Page 25

• Manufacturer Part Number: PM6686
• Description: Dual Step-down Controller With Adjustable Voltages, Adjustable Ldo And Auxiliary Charge Pump Controller For Notebook
• Manufacturer: STMicroelectronics

PM6686
Figure 45. Resistor divider to configure the output voltage
Where R1, R2 are the resistors of the FB1 pin divider, as shown in Figure 2.
OUT2 output voltage is programmed with REFIN2 pin. Fixed output voltage is selected
connecting REFIN2 to VREF3 (OUT2 = 1.05 V) or to VCC (OUT2 = 3.3 V).
When the REFIN2 voltage is between 0.7 V and 2.5 V, OUT2 output voltage tracks REFIN2
voltage. When REFIN2 is lower than 0.5 V the section is turned OFF.
Table 7.
Output
OUT1
OUT2
Switching output voltages configuration
control pin
CO UT
REFIN2
VOUT
FB1
Doc ID 15281 Rev 4
Resistor divider
connected to
Control pin
Ext source
VREF3
R2
R1
GND
VCC
VCC
L
Operation mode
Tracking
Fixed
Fixed
Fixed
Fixed
Adj
FB1
PHASE
V
OUT
Output voltage
Device description
1
=
=REFIN2
0
1.05 V
1.5 V
3.3 V
7 .
5 V
V
⋅
⎛
⎜
⎝
R
R
1
2
+
25/50
1
⎞
⎟
⎠