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| 型号： | ADP2303-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP2303 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 电流 - 输出： | 3A |
| 输入电压： | 3 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 700kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2303 |
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V OUT ? V D
Data Sheet
INPUT CAPACITOR
The input capacitor must be able to support the maximum input
operating voltage and the maximum RMS input current. The
rms ripple current flowing through the input capacitor is, at
maximum, I LOAD(max) /2. Select an input capacitor capable of
withstanding the rms ripple current for an application’s maxi-
mum load current using the following equation:
I IN ( RMS ) ? I LOAD (max) ? D ? ? 1 ? D ?
where D is the duty cycle and is equal to
D ?
V IN ? V D
The recommended input capacitance is ceramic with X5R or X7R
dielectrics due to its low ESR and small temperature coefficients.
A capacitance of 10 μF should be adequate for most applications.
To minimize supply noise, place the input capacitor as close as
possible to the VIN pin of the ADP2302/ADP2303.
OUTPUT CAPACITOR
The output capacitor selection affects both the output voltage ripple
and the loop dynamics of the regulator. The ADP2302/ADP2303
are designed to operate with small ceramic capacitors that have
low ESR and equivalent series inductance (ESL) and are, therefore,
easily able to meet stringent output voltage ripple specifications.
When the regulator operates in continuous conduction mode,
the overall output voltage ripple is the sum of the voltage spike
caused by the output capacitor equivalent series resistance
(ESR) plus the voltage ripple caused by the charging and
discharging of the output capacitor
ADP2302/ADP2303
coefficients. Y5V and Z5U dielectrics are not recommended
because of their poor temperature and dc bias characteristics.
In general, most applications require a minimum output
capacitor value of 2 × 22 μF.
Some recommended output capacitors for V OUT ≤ 5.0 V are
THERMAL CONSIDERATION
ADP2302/ADP2303 have an internal high-side MOSFET and
its drive circuit. Only a small amount of power dissipates inside
the ADP2302/ADP2303 package under typical load conditions,
which reduces thermal constraints.
However, in applications with maximum loads at high ambient
temperature and high duty cycle, the heat dissipated in the
package may cause the junction temperature of the die to
exceed the maximum junction temperature of 125°C. If the
junction temperature exceeds 150°C, the regulator goes into
thermal shutdown and recovers when the junction temperature
drops below 135°C.
The junction temperature of the die is the sum of the ambient
temperature and the temperature rise of the package due to
power dissipation, as indicated in the following equation:
T J = T A + T R
where:
T J is the junction temperature.
T A is the ambient temperature.
T R is the rising temperature of the package due to power
dissipation.
The rising temperature of the package is directly proportional
? V RIPPLE ? ? I RIPPLE ? ? ?
?
?
? 1
? 8 ? f sw ? C OUT
? ESR C OUT
?
?
to the power dissipation in the package. The proportionality
constant for this relationship is the thermal resistance from the
junction of the die to the ambient temperature, as shown in the
Capacitors with lower ESR are preferable to guarantee low
output voltage ripple, as shown in the following equation:
following equation:
T R = θ JA × P D
ESR Cout
?
? V RIPPLE
? I RIPPLE
where:
T R is the rising temperature of the package.
Ceramic capacitors are manufactured with a variety of dielec-
trics, each with different behavior over temperature and applied
voltage. X5R or X7R dielectrics are recommended for best
performance, due to their low ESR and small temperature
Table 9. Recommended Capacitors for V OUT ≤ 5.0 V
θ JA is the thermal resistance from the junction of the die to the
ambient temperature of the package.
P D is the power dissipation in the package.
Vendor
Murata
TDK
Value
22 μF, 6.3 V, X5R
47 μF, 6.3 V, X5R
22 μF, 6.3 V, X5R
33 μF, 6.3 V, X5R
47 μF, 6.3 V, X5R
Part No.
GRM31CR60J226KE19
GRM32ER60J476ME20
C3216X5R0J226MB
C3216X5R0J336MB
C3225X5R0J476MB
Dimensions L × W × H (mm)
3.2 × 2.5 × 2.0
3.2 × 2.5 × 2.0
3.2 × 1.6 × 0.85
3.2 × 1.6 × 1.3
3.2 × 2.5 × 2.5
Rev. A | Page 19 of 28
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