NXP Semiconductors
PF4210
14-channel power management integrated circuit (PMIC) for audio/video applications
[2] 3.0 V < VIN < 4.5 V, no external loading on VCOREDIG, VCORE, or VCOREREF. Extended operation down to UVDET, but no system malfunction.
10.3.1.1 External components
Table 17.ꢀExternal components for core voltage
Regulator
VCOREDIG
VCORE
Capacitor value (µF)
1.0
1.0
VCOREREF
0.22
10.3.2 VREFDDR voltage reference
VREFDDR is an internal PMOS half supply voltage follower capable of supplying up
to 10 mA. The output voltage is at one half the input voltage. It is typically used as the
reference voltage for DDR memories.
A filtered resistor divider is utilized to create a low frequency pole. This divider then
utilizes a voltage follower to drive the load.
VINREFDDR
VINREFDDR
C
HALF1
100 nF
VHALF
C
HALF2
100 nF
Discharge
VREFDDR
VREFDDR
C
REFDDR
1.0
F
aaa-026475
Figure 6.ꢀVREFDDR block diagram
10.3.2.1 VREFDDR control register
The VREFDDR voltage reference is controlled by a single bit in VREFDDCRTL register
in Table 18.
Table 18.ꢀRegister VREFDDCRTL – ADDR 0x6A
Name
Bit number
R/W
—
Default Description
UNUSED
VREFDDREN
3:0
4
0x00
0x00
unused
R/W
Enables or disables VREFDDR output voltage
• 0 = VREFDDR disabled
• 1 = VREFDDR enabled
UNUSED
7:5
—
0x00
unused
10.3.2.1.1 External components
Table 19.ꢀVREFDDR external components
Capacitor [1]
Capacitance (µF)
VINREFDDR to VHALF [2]
0.1
PF4210
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Data sheet: technical data
Rev. 2.0 — 14 November 2018
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