PM6686 STMicroelectronics, PM6686 Datasheet - Page 37

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

PM6686
9.6
9.7
9.7.1
The minimum voltage of the charge pump is:
Equation 7
Where V
In case the charge pump feedback is not used, leave the CP_FB pin floating or connect the
pin to VCC.
Voltage references
The PM6686 provides two voltage references.
The device regulates a 3,3 V voltage reference (VREF3) with ±2% accuracy over
temperature. VREF3 can source up to 5 mA. VREF3 voltage is always available if V
applied. The device allows the enabling of the outputs if VREF3 is above 2,8V typ. and turns
off when VREF3 falls under 2,7 V typ.
VREF2 is a + 2 V reference with an accuracy of ±1% over temperature. It can source up to
50 µA typ. and sink up to 10 µA. VREF2is adopted as internal reference; this voltage can be
used as voltage threshold to set configuration pins (e.g. TON, SKIP pins). VREF2 is enabled
when one enable pin (EN1, EN2 or EN_LDO) is pulled high.
General device fault management
Thermal protection
If the internal temperature of the device exceeds typically +150 °C, the controller shuts down
immediately all the internal circuitry. Switching sections performs the soft-end management.
Toggling EN, EN LDO or cycling VIN resets the latched fault.
CP_FB
is the minimum voltage of CP_FB pin(2V typ.).
Doc ID 15281 Rev 4
V
CP
_
MIN
=
V
CP
_
FB
⋅
⎛
⎜ ⎜
⎝
1
+
R
R
2
1
⎞
⎟ ⎟
⎠
Monitoring and protections
IN
is
37/50