ADP2120ACPZ-2.5-R7 datasheet(19/24 Pages) AD

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ADP2119/ADP2120

Rev. 0 | Page 19 of 24

Higher or lower inductor and output capacitor values can be

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

performance need to be checked. The minimum output capacitor

is 22 μF for the ADP2119 and 10 μF for the ADP2120, and the

inductor range is 1 μH to 3.3 μH.

Table 7. Recommended Inductors

Manufacturer

Part Number

Sumida

CDRH5D18BHPNP, CDR6D23MNNP

TOKO

DE4518C, D62LCB

Coilcraft

LPS5030, LPS5015

Table 8. Recommended Capacitors

Manufacturer

Part Number

Description

Murata

GRM31CR60J226KE19

22 μF, 6.3 V, X5R, 1206

Murata

GRM319R60J106KE19

10 μF, 6.3 V, X5R, 1206

TDK

C3216X5R0J226M

22 μF, 6.3 V, X5R, 1206

TDK

C3216X5R0J106M

10 μF, 6.3 V, X5R, 1206

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 pin. A 10 μF or 22 μF ceramic capacitor is

recommended. The rms current rating of the input capacitor

should be larger than calculated by the following equation:

)

(

RMS

−

VOLTAGE TRACKING

The ADP2119/ADP2120 include a tracking feature that allows

the output (slave voltage) to be configured to track an external

voltage (master voltage), as shown in Figure 51.

ADP2119/

ADP2120

TRK

VMASTER

RTRKB

RTRKT

RBOT

RTOP

VSLAVE

Figure 51. Voltage Tracking

A common application is coincident tracking (see Figure 52).

Coincident tracking limits the slave output voltage to be the

same as the master voltage until it reaches regulation. Connect

the TRK pin to a resistor divider from the master voltage. For

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

TIME

VMASTER

VSLAVE

Figure 52. Coincident Tracking

Ratiometric tracking is shown in Figure 53. The slave output is

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

the slave and master voltages reach the final value at the same

time. The ratio of the slave output voltage to the master voltage

is a function of the two dividers (see the following equation).

TRKB

TRKT

BOT

TOP

MASTER

SLAVE

TIME

VMASTER

VSLAVE

Figure 53. Ratiometric Tracking

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