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| 型号： | ADP2147ACBZ-110-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 0.8A 6WLCSP |
| 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： | 1.275V，0.981V |
| 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： | 800mA |
| 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： | 6-UFBGA，WLCSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-WLCSP（1.03x1.50） |
| 其它名称： | ADP2147ACBZ-110-R7DKR |
ADP2147
ESR COUT ≤
Capacitors with lower equivalent series resistance (ESR) are
preferred to guarantee low output voltage ripple, as shown in
the following equation:
V RIPPLE
I RIPPLE
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is 3 μF.
thermal shutdown. The regulator recovers when the junction
temperature falls below 130°C.
The junction temperature of the die is the sum of the ambient
temperature of the environment and the temperature rise of the
package due to power dissipation, as shown in the following
equation:
T J = T A + T R
Table 7. Suggested 4.7 μF Capacitors
Vendor Type Model
Murata X5R GRM188R60J475
Taiyo Yuden X5R JMK107BJ475
Case
Size
0603
0603
Voltage
Rating (V)
6.3
6.3
where:
T J is the junction temperature.
T A is the ambient temperature.
T R is the rise in temperature of the package due to power
dissipation.
TDK
X5R
C1608X5R0J475
0603
6.3
The package’s rise in temperature is directly proportional to the
power dissipation in the package. The proportionality constant
I CIN ≥ I LOAD ( MAX )
Input Capacitor
Higher value input capacitors help to reduce the input voltage
ripple and improve transient response. Maximum input
capacitor current is calculated using the following equation:
V OUT ( V IN ? V OUT )
V IN
To minimize supply noise, place the input capacitor as close to
the VIN pin of the ADP2147 as possible. As with the output
capacitor, a low ESR capacitor is recommended. The list of
Table 8. Suggested 4.7 μF Capacitors
for this relationship is the thermal resistance from the junction
of the die to the ambient temperature, as shown in the following
equation:
T R = θ JA × P D
where:
T R is the rise in temperature of the package.
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.
PCB LAYOUT GUIDELINES
Poor layout can affect the ADP2147 performance, causing EMI
and electromagnetic compatibility problems, ground bounce,
Vendor
Type
Model
Case
Size
Voltage
Rating (V)
and voltage losses. Poor layout can also affect regulation and
stability. To implement a good layout, use the following rules:
Murata
Taiyo Yuden
TDK
X5R
X5R
X5R
GRM188R60J475
JMK107BJ475
C1608X5R0J475
0603
0603
0603
6.3
6.3
6.3
?
Place the inductor, input capacitor, and output capacitor
close to the IC using short tracks. These components carry
high switching frequencies, and large tracks act as antennas.
THERMAL CONSIDERATIONS
Because of the high efficiency of the ADP2147, only a small
amount of power is dissipated inside the ADP2147 package, which
reduces thermal constraints of the design.
However, in applications with maximum loads at high ambient
temperature, low supply voltage, and high duty cycle, the heat
dissipated in the package is high enough that it may cause the
?
?
?
Route the output voltage path away from the inductor and
SW node to minimize noise and magnetic interference.
Maximize the size of ground metal on the component side
to help with thermal dissipation.
Use a ground plane with several vias connecting to the com-
ponent side ground to further reduce noise interference on
sensitive circuit nodes.
junction temperature of the die to exceed the 125°C maximum.
If the junction temperature exceeds 150°C, the converter enters
Rev. 0 | Page 14 of 16
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| ADP2147ACBZ-150-R7 | 功能描述:IC REG BUCK SYNC 1.2V/1V 6WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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