Datasheet

KSZ8895MQX/RQX/FQX/MLX
DS00002246A-page 26  2016 Microchip Technology Inc.
3.2.2 USING EXTERNAL 1.2V LDO REGULATOR
The KSZ8895MQX/RQX/FQX/MLX can use an external 1.2V LDO regulator too. When use an external 1.2V LDO reg-
ulator solution, the Pin 126 should be pulled down by the pull-down resistor to disable the internal 1.2V LDO controller.
There is no a power sequence request if all power rails voltage are ready after the power-up reset done.
Using the external 1.2V LDO regulator is illustrated in Figure 9. The number of capacitors, values of capacitors, and
exact placement of components will depend on the specific design.
FIGURE 3-4: RECOMMENDED 1.2V POWER CONNECTION USING INTERNAL 1.2V LDO
CONTROLLER
FIGURE 3-5: RECOMMENDED 1.2V POWER CONNECTION USING AN EXTERNAL 1.2V
REGULATOR
FB
125
VDDAT
9,18,24,37
3,15,31
3.3V
1.2V
126
VDDAR
VDDC
50,89,117
VDDIO
59,77,100
GNDA GNDD
2,6,12,16,21,27,30,34,127 49,58,76,88,99,116
Nȍ
Nȍ
DS
G
ȍ
47μF
FB
125
VDDAT
9,18,24,37
3,15,31
126
VDDAR
VDDC
50,89,117
VDDIO
59,77,100
GNDA GNDD
2,6,12,16,21,27,30,34,127 49,58,76,88,99,116
Nȍ
1.2V