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参数资料
| 型号： | ADP2108ACBZ-1.3-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.3V .6A 5WLCSP |
| 产品变化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.3V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 5-WFBGA，WLCSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 5-WLCSP |
| 其它名称： | ADP2108ACBZ-1.3-R7DKR |
Data Sheet
APPLICATIONS INFORMATION
ADP2108
ADIsimPower DESIGN TOOL
The ADP2108 is supported by ADIsimPower design tool set.
ADIsimPower is a collection of tools that produce complete
power designs optimized for a specific design goal. The tools
enable the user to generate a full schematic, bill of materials,
Table 6. S uggested 1.0 μ H Inductors
Vendor Model Dimensions
Murata LQM21PN1R0M 2.0 × 1.25 × 0.5
Murata LQM31PN1R0M 3.2 × 1.6 × 0.85
Murata LQM2HPN1R0M 2.5 × 2.0 × 1.1
I SAT (mA)
800
1200
1500
DCR (mΩ)
190
120
90
and calculate performance in minutes. ADIsimPower can
optimize designs for cost, area, efficiency, and parts count
while taking into consideration the operating conditions and
Coilcraft
Toko
TDK
LPS3010-102
MDT2520-CN
CPL2512T
3.0 × 3.0 × 0.9
2.5 × 2.0 × 1.2
2.5 × 1.5 × 1.2
1700
1800
1500
85
100
100
V OUT × ( V IN ? V OUT )
V IN × f SW × L
I PEAK = I LOAD ( MAX ) +
limitations of the IC and all real external components. For
more information about ADIsimPower design tools, refer to
www.analog.com/ADIsimPower . The tool set is available from
this website, and users can also request an unpopulated board
through the tool.
EXTERNAL COMPONENT SELECTION
Trade-offs between performance parameters such as efficiency
and transient response can be made by varying the choice of
external components in the applications circuit, as shown in
Inductor
The high switching frequency of the ADP2108 allows for the
selection of small chip inductors. For best performance, use
inductor values between 0.7 μH and 3 μH. Recommended
The peak-to-peak inductor current ripple is calculated using
the following equation:
I RIPPLE =
where:
f SW is the switching frequency.
L is the inductor value.
The minimum dc current rating of the inductor must be greater
than the inductor peak current. The inductor peak current is
calculated using the following equation:
I RIPPLE
2
Inductor conduction losses are caused by the flow of current
through the inductor, which has an associated internal DCR.
Larger sized inductors have smaller DCR, which may decrease
inductor conduction losses. Inductor core losses are related to
Output Capacitor
Higher output capacitor values reduce the output voltage ripple
and improve load transient response. When choosing this value,
it is also important to account for the loss of capacitance due to
output voltage dc bias.
Ceramic capacitors are manufactured with a variety of dielectrics,
each with different behavior over temperature and applied voltage.
Capacitors must have a dielectric adequate to ensure the minimum
capacitance over the necessary temperature range and dc bias
conditions. X5R or X7R dielectrics with a voltage rating of 6.3 V
or 10 V are recommended for best performance. Y5V and Z5U
dielectrics are not recommended for use with any dc-to-dc
converter because of their poor temperature and dc bias
characteristics.
The worst-case capacitance accounting for capacitor variation
over temperature, component tolerance, and voltage is calcu-
lated using the following equation:
C EFF = C OUT × (1 ? TEMPCO ) × (1 ? TOL )
where:
C EFF is the effective capacitance at the operating voltage.
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
In this example, the worst-case temperature coefficient (TEMPCO)
over ?40°C to +125°C is assumed to be 15% for an X5R dielectric.
The tolerance of the capacitor (TOL) is assumed to be 10%, and
Substituting these values in the equation yields
C EFF = 9.2 μF × (1 ? 0.15) × (1 ? 0.1) = 7.0 μF
To guarantee the performance of the ADP2108, it is imperative
that the effects of dc bias, temperature, and tolerances on the
behavior of the capacitors be evaluated for each application.
the magnetic permeability of the core material. Because the
ADP2108 is a high switching frequency dc-to-dc converter,
shielded ferrite core material is recommended for its low core
losses and low EMI.
Rev. G | Page 13 of 20
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