ADP2119-EVALZ Analog Devices Inc, ADP2119-EVALZ Datasheet - Page 19

• Manufacturer Part Number: ADP2119-EVALZ
• Description: Step-Down Regulator Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of ADP2119-EVALZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Step Down DC/DC Converter
• Kit Application Type: Power Management - Voltage Regulator
• Silicon Core Number: ADP2119
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 0.6V ~ Vin
• Current - Output: 2A
• Voltage - Input: 2.3 ~ 5.5 V
• Regulator Topology: Buck
• Frequency - Switching: 1.2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: ADP2119
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Sumida
TOKO
Coilcraft
Table 8. Recommended Capacitors
Manufacturer
Murata
Murata
TDK
TDK
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:
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.
I
RMS
V
=
MASTER
I
O
R
R
TRKT
TRKB
×
Part Number
GRM31CR60J226KE19
GRM319R60J106KE19
C3216X5R0J226M
C3216X5R0J106M
D
TRK
×
Figure 51. Voltage Tracking
ADP2119/
ADP2120
Part Number
CDRH5D18BHPNP, CDR6D23MNNP
DE4518C, D62LCB
LPS5030, LPS5015
1 ( D
−
)
FB
R
R
BOT
TOP
Description
22 μF, 6.3 V, X5R, 1206
10 μF, 6.3 V, X5R, 1206
22 μF, 6.3 V, X5R, 1206
10 μF, 6.3 V, X5R, 1206
V
SLAVE
Rev. 0 | Page 19 of 24
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 R
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).
V
V
MASTER
SLAVE
=
1
1
+
+
Figure 53. Ratiometric Tracking
Figure 52. Coincident Tracking
R
R
R
R
TRKT
TRKB
TOP
BOT
TRKT
= R
V
V
MASTER
V
TIME
SLAVE
V
MASTER
TIME
TOP
SLAVE
ADP2119/ADP2120
and R
TRKB
= R
BOT
.