MMPF0200 datasheet(23/114 Pages) NXP

23 / 114 page

NXP Semiconductors

PF0200

FUNCTIONAL BLOCK REQUIREMENTS AND BEHAVIORS

6.3.1.1

External components

6.3.2

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. Its 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.

Figure 7. VREFDDR block diagram

Table 16. Core voltages electrical specifications(28)

Consumer TA = -40 to 85 °C and Extended Industrial TA = -40 to 105 °C, VIN = 2.8 to 4.5 V, LICELL = 1.8 to 3.3 V, and typical external

component values. Typical values are characterized at VIN = 3.6 V, LICELL = 3.0 V, and 25 °C, unless otherwise noted.

Symbol

Parameters

Min.

Typ.

Max.

Units

Notes

VCOREDIG (digital core supply)

VCOREDIG

Output Voltage

ON mode

Coin cell mode and OFF

–

1.5

1.3

–

(27)

VCORE (Analog core supply)

VCORE

Output Voltage

ON mode and charging

OFF and Coin cell mode

–

2.775

0.0

–

(27)

VCOREREF (bandgap / regulator reference)

VCOREREF

Output Voltage

–

1.2

–

(27)

VCOREREFACC

Absolute Accuracy

–

0.5

–

VCOREREFTACC

Temperature Drift

–

0.25

–

Notes

27.

3.0 V < VIN < 4.5 V, no external loading on VCOREDIG, VCORE, or VCOREREF. Extended operation down to UVDET, but no system malfunction.

28.

For information only.

Table 17. External components for core voltages

Regulator

Capacitor value (

μF)

VCOREDIG

1.0

VCORE

1.0

VCOREREF

0.22

VINREFDDR

VREFDDR

VINREFDDR

CHALF1

Discharge

VHALF

VREFDDR

CHALF2

100 nf

CREFDDR

1.0 uf

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