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参数资料
| 型号： | ADP2126-1.2-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP2126 1.2VOUT |
| 标准包装： | 1 |
| 系列： | * |
ADP2126/ADP2127
APPLICATIONS INFORMATION
The low-profile ADP2126 / ADP2127 are compatible with chip
inductors and multilayer ceramic capacitors that are ideal for
use in portable applications due to their small footprint and low
Data Sheet
It is important that the minimum dc current rating of the inductor
be greater than the peak inductor current (I PK ) in the application.
I PK is calculated from
height. The recommended components for low-profile applications
I PK = I LOAD(MAX) + Δ I L /2
(3)
may change as this technology advances. Table 5 and Table 6 list
compatible inductors and capacitors.
This section describes the selection of external components.
The component value ranges are limited to optimize efficiency
and transient performance while maintaining stability over the
full operating range.
INDUCTOR SELECTION
The dc current rating of the inductor should be greater than the
calculated I PK to prevent core saturation.
INPUT CAPACITOR SELECTION
The input capacitor must be rated to support the maximum input
operating voltage. Higher value input capacitors reduce the input
voltage ripple caused by the switch currents on the VIN pin.
Maximum rms input current for the application is calculated using
The high switching frequency of the ADP2126/ADP2127 allows for
minimal output voltage ripple, even with small inductors. Inductor
sizing is a trade-off between efficiency and transient response.
I RMS _ MAX ( CIN ) = I LOAD ( MAX ) ×
V OUT × ( V IN ? V OUT )
V IN
(4)
V OUT × ( V IN ? V OUT )
V IN × L × f SW
A small value inductor leads to a larger inductor current ripple,
which provides excellent transient response but degrades efficiency.
A small footprint and low height chip inductor can be used for an
overall smaller solution size but has a higher dc resistance (DCR)
value and lower current rating that can degrade performance.
Shielded ferrite core inductors are advantageous for their low core
losses and low electromagnetic interference (EMI). For optimal
performance and stability, use inductor values between 1.5 μH
The inductor peak-to-peak current ripple, ΔI L , is calculated from
Δ I L = (2)
Place the input capacitor as close as possible to the VIN pin to
minimize supply noise.
In principle, different types of capacitors can be considered, but
for battery-powered applications, the best choice is the multilayer
ceramic capacitor, due to its small size, low equivalent series
resistance (ESR), and low equivalent series inductance (ESL).
It is recommended that the VIN pin be bypassed with at least a
2.2 μF input capacitor. For a 0.22 mm height solution using the
ADP2127, at least 2 × 1.0 μF capacitors will be necessary on the
input. The input capacitor can be increased without any limit for
better input voltage filtering. X5R or X7R dielectrics with a voltage
rating of 6.3 V or higher are recommended.
where:
f SW is the switching frequency.
L is the inductor value.
Table 5. Inductor Selection
Current
Manufacturer
Murata
Taiyo Yuden
Series
LQM18PN1R0-A52
CKP1608S1R5M
Inductance (μH)
1.0
1.5
DCR (mΩ) (Typ)
520
420
Rating (mA)
500
500
Size (L × W × H) (mm)
1.6 × 0.8 × 0.33
1.6 × 0.8 × 0.33
Package
0603
0603
Table 6. Input/Output Capacitor Selection
Temperature
Manufacturer
Murata
Taiyo Yuden
TDK
Part Number
GRM153R60J225ME95
GRM153R60G225M
JMK105BJ225MP
AMK105BJ225MP
AMK105BJ105MC
ADC105BJ105ME
JMK105BJ474KC
JMK105BJ474MC
CGB2A3X5R0J105K
CGB2A3X5R0J105M
Capacitance (μF)
2.2 ± 20%
2.2 ± 20%
2.2 ± 20%
2.2 ± 20%
1.0 ± 20%
1.0 ± 20%
0.47 ± 10%
0.47 ± 20%
1.0 ± 10%
1.0 ± 20%
Voltage Rating (V)
6.3
4
6.3
4
4
4
6.3
6.3
6.3
6.3
Coefficient
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
X5R
Size (L × W × H) (mm)
1.0 × 0.5 × 0.33
1.0 × 0.5 × 0.33
1.0 × 0.5 × 0.33
1.0 × 0.5 × 0.33
1.0 × 0.5 × 0.22
1.0 × 0.5 × 0.20
1.0 × 0.5 × 0.22
1.0 × 0.5 × 0.22
1.0 × 0.5 × 0.33
1.0 × 0.5 × 0.33
Package
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
Rev. B | Page 14 of 20
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