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参数资料
| 型号： | ADP2370ACPZ-5.0-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V 0.8A 8LFCSP |
| 标准包装： | 1,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 3.2 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz ~ 1.2MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘，CSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-LFCSP（3x3） |
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ADP2370/ADP2371
CAPACITOR SELECTION
Output Capacitor
The ADP2370 / ADP2371 are designed for operation with small,
space-saving ceramic capacitors, but function with most commonly
used capacitors provided that the effective series resistance (ESR)
value is carefully considered. The ESR of the output capacitor
affects stability of the control loop. A minimum output capaci-
tance of 7 μF with an ESR of 10 mΩ or less is recommended to
Data Sheet
of a several 10 μF capacitors in different case sizes and voltage
ratings. The voltage stability of a capacitor is strongly influenced
by the capacitor size and voltage rating. In general, a capacitor in a
larger package or higher voltage rating exhibits better stability.
The temperature variation of the X5R dielectric is about ±15%
over the ?40°C to +85°C temperature range and is not a
function of package or voltage rating.
12
11
Transient response to changes in load current is also affected by
output capacitance. Using a larger value of output capacitance
improves the transient response of the ADP2370 / ADP2371 to
large changes in load current. Figure 84 shows the transient
response for an output capacitance value of 10 μF.
LOAD CURRENT
1
10
9
8
7
6
5
4
3
2
1
10μF/25V/1210
10μF/35V/1210
10μF/16V/0805
10μF/16V/1206
2
V OUT
0
0
5
10
15
20
25
30
35
DC BIAS VOLTAGE (V)
Figure 85. Capacitance vs. Voltage Characteristic Different Case Sizes
INDUCTOR CURRENT
Use Equation 1 to determine the worst-case capacitance,
accounting for capacitor variation over temperature,
component tolerance, and voltage.
W M20.0μs A CH1
3
CH1 500mA ? BW CH2 50.0mV
CH3 500mA ? BW
B
T 10.40%
560mA
C EFF = C BIAS × (1 ? TEMPCO ) × (1 ? TOL )
where:
(1)
Figure 84. Output Transient Response, V OUT2 = 1.8 V, C OUT = 10 μF,
300 mA to 800 mA, Load Current Rise Time = 200 ns
Input Bypass Capacitor
Connecting a 10 μF capacitor from VIN to GND reduces the
circuit sensitivity to the PCB layout, especially when long input
traces or high source impedance are encountered. If greater than
10 μF of output capacitance is required, increase the input
capacitor to match it to improve the transient response.
Input and Output Capacitor Properties
and maximum ESR requirements. Ceramic capacitors are manu-
factured 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
C BIAS 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 TEMPCO over ?40°C to +85°C
is assumed to be 15% for an X5R dielectric. The tolerance of the
capacitor (TOL) is assumed to be 10%, and C BIAS is 8.53 μF at 12 V
Substituting these values in Equation 1 yields
C EFF = 8.53 μF × (1 ? 0.15) × (1 ? 0.1) = 6.53 μF
Therefore, the capacitor chosen in this example meets the
over temperature and tolerance at the chosen output voltage.
To guarantee the performance of the ADP2370 / ADP2371 , it is
imperative that the effects of dc bias, temperature, and
tolerances of the capacitors are evaluated for each application.
dielectric capacitors with a voltage rating of 6.3 V to 25 V are
recommended for best performance. Y5V and Z5U dielectrics
are not recommended because of their poor temperature and dc
bias characteristics.
Rev. D | Page 28 of 32
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2370ACPZ-R2 | 功能描述:直流/直流开关调节器 800mA Buck AdjVoutt RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ADP2370ACPZ-R7 | 功能描述:IC REG BUCK SYNC ADJ 0.8A 8LFCSP 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 |
| ADP2371 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Voltage, 1.2 MHz/600 kHz, 800 mA |
| ADP2371ACPZ-1.2-R7 | 功能描述:IC REG BUCK SYNC 1.2V .8A 8LFCSP 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 |
| ADP2371ACPZ-1.8-R7 | 功能描述:IC REG BUCK SYNC 1.8V .8A 8LFCSP 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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