PM6686TR STMicroelectronics, PM6686TR Datasheet - Page 35

• Manufacturer Part Number: PM6686TR
• Description: IC CTLR DUAL STEP DOWN VFQFPN32
• Manufacturer: STMicroelectronics

Specifications of PM6686TR

• Applications: Controller, Notebook Computers
• Voltage - Input: 5.5 ~ 28 V
• Number Of Outputs: 2
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-VFQFN, 32-VFQFPN
• Output Voltage: 5.5 V
• Output Current: 100 mA
• Output Power: 4.3 mW
• Input Voltage: 5.5 V to 28 V
• Switching Frequency: 33 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8522-2

PM6686
9.4
Linear regulator section
The PM6686 has an integrated linear regulator (LDO) that can provide an average of
100 mA typ. with a peak current of 270 mA typ. The LDO can be enabled using EN_LDO
pin. If VIN is applied the linear regulator is active even if PVCC is low.
The output voltage can be programmed by LDOREFIN pin. If LDOREFIN pin is tied to
ground (GND) the LDO provides a +5 V output voltage. If it is connected to VREF3 pin the
LDO regulates 3.3 V. If the voltage at the LDOREFIN pin is between 0.35 V and 2.25 V the
LDO generates an output voltage equals to 2xV
Table 12.
The controller provides a switchover function when LDOREFIN pin is connected to VCC or
GND. If the voltage at LDO_SW pin is high enough, the internal linear regulator is turned off
and the LDO pin is connected with an internal MOSFET to the LDO_SW pin. This feature
decreases the power dissipation of the device.
When the switchover function is used the maximum current capability is 200 mA if LDO
output is +5 V and 100 mA if the LDO output is +3.3 V.
Table 13.
0,35 V < V
0,35 V < V
V
< 0,35 V
< 0,35 V
> 2.43 V
> 2.43 V
LDOREFIN
LDOREFIN
LDO output voltage configuration
LDO switchover management
LDOREFIN voltage
LDOREFIN
VREF3
< 2,25 V
GND
< 2,25 V
Doc ID 15281 Rev 4
V
BYPLDO_SW
> 4,75 V
< 4,55 V
> 3.18 V
< 3.05 V
2x V
LDOREFIN
+3,3 V
+3,3 V
V
+5 V
+5 V
LDOREFIN
LDO
.
Monitoring and protections
2x V
LDO voltage
Internal LDO
Disabled
Disabled
Enabled
Enabled
Enabled
+3,3 V
+5 V
LDOREFIN
Switchover
resistance
0.81 Ω
1.12 Ω
-
-
-
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