ADP2164ACPZ-1.2-R7 datasheet(17/20 Pages) AD

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Data Sheet

ADP2164

Rev. 0 | Page 17 of 20

Table 6. Recommended L and COUT Values at fS = 600 kHz

VIN (V)

VOUT (V)

L (μH)

COUT (μF)

3.3

1.0

100 + 100

3.3

1.2

100 + 100

3.3

1.5

100 + 47

3.3

1.8

100 + 47

3.3

2.5

100

1.0

100 + 100

1.2

1.5

100 + 100

1.5

100 + 47

1.8

1.5

100 + 47

2.5

1.5

100

3.3

1.5

100

Higher or lower values of inductors and output capacitors can

be used in the regulator, but system stability and load transient

performance must be verified.

Table 7 and Table 8 list some recommended inductors and

capacitors for the ADP2164.

Table 7. Recommended Inductors

Manufacturer

Part No.

Coilcraft®

MSS1038, MSS1048, MSS1260

Sumida

CDRH103R, CDRH104R, CDRH105R

Table 8. Recommended Capacitors

Manufacturer

Part No.

Description

Murata

GRM32ER60J107ME20

100 μF, 6.3 V, X5R, 1210

Murata

GRM32ER60J476ME20

47 μF, 6.3 V, X5R, 1210

TDK

C3225X5R0J107M

100 μF, 6.3 V, X5R, 1210

TDK

C3225X5R0J476M

47 μF, 6.3 V, X5R, 1210

INPUT CAPACITOR SELECTION

The input capacitor reduces the input voltage ripple caused by

the switch current on PVIN. Place the input capacitor as close

as possible to the PVIN pins. A 22 μF or 47 μF ceramic capacitor

is recommended. The rms current rating of the input capacitor

should be larger than the value calculated using the following

equation:

()

RMS

−

where D is the duty cycle.

VOLTAGE TRACKING

The ADP2164 includes a tracking feature that allows the

ADP2164 output (slave voltage) to be configured to track

an external voltage (master voltage), as shown in Figure 39.

ADP2164

RTOP

RBOT

RTRKT

RTRKB

VSLAVE

MASTER

TRK

Figure 39. Voltage Tracking

Coincident Tracking

A common requirement is coincident tracking, as shown in

Figure 40. Coincident tracking limits the slave output voltage

to the same value as the master voltage until the slave output

voltage reaches regulation. Connect the TRK pin to a resistor

divider driven from the master voltage, as shown in Figure 39.

For coincident tracking, set RTRKT = RTOP and RTRKB = RBOT.

OLTAGE

TIME

VSLAVE

VMASTER

Figure 40. Coincident Tracking

Ratiometric Tracking

Ratiometric tracking is shown in Figure 41. The slave output is

limited to a fraction of the master voltage. In this application, the

slave and master voltages reach their final values at the same time.

OLTAGE

TIME

VSLAVE

VMASTER

Figure 41. Ratiometric Tracking

The ratio of the slave output voltage to the master voltage is a

function of the two dividers.

TRKB

TRKT

BOT

TOP

MASTER

SLAVE

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