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| 型号： | AS1324-AD EB |
| 厂商： | ams |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AS1324-AD |
| 设计资源： | Design Support Tool |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 600mA |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.5MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS1324-AD |
AS1324
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.4 Input Capacitor Selection
In continuous mode, the source current of the PMOS is a square wave of the duty cycle V OUT /V IN . To prevent large voltage transients while
minimizing the interference with other circuits caused by high input voltage spikes, a low ESR input capacitor sized for the maximum RMS
current must be used. The maximum RMS capacitor current is given as:
V OUT × ( V IN – V OUT )
I RMS = I MAX × ------------------------------------------------------------
V IN
(EQ 6)
where the maximum average output current I MAX equals the peak current minus half the peak-to-peak ripple current, I MAX = I LIM - ? I L /2
This formula has a maximum at V IN = 2V OUT where I RMS = I OUT /2. This simple worst-case condition is commonly used for design because
even significant deviations only provide negligible affects.
The input capacitor can be increased without any limit for better input voltage filtering. Take care when using small ceramic input capacitors.
When a small ceramic capacitor is used at the input, and the power is being supplied through long wires, such as from a wall adapter, a load step
at the output, or V IN step on the input, can induce ringing at the VIN pin. This ringing can then couple to the output and be mistaken as loop
instability, or could even damage the part by exceeding the maximum ratings.
9.4.1
Ceramic Input and Output Capacitors
When choosing ceramic capacitors for C IN and C OUT , the X5R or X7R dielectric formulations are recommended. These dielectrics have the
best temperature and voltage characteristics for a given value and size. Y5V and Z5U dielectric capacitors, aside from their wide variation in
capacitance over temperature, become resistive at high frequencies and therefore should not be used.
Table 6. Recommended Input and Output Capacitor
Part Number
JMK212BJ226MG-T
GRM188R60J106ME47
GRM21BR71A475KA73
C
22μF
10μF
4.7μF
TC Code
X5R
X5R
X7R
Rated Voltage
6.3V
6.3V
10V
Dimensions (L/W/T)
0805
0603
0805
Taiyo Yuden
Murata
www.murata.com
Because ceramic capacitors lose a lot of their initial capacitance at their maximum rated voltage, it is recommended that either a higher input
capacity or a capacitance with a higher rated voltage is used.
9.5 Feedback Resistor Selection
In the AS1324-AD, the output voltage is set by an external resistor divider connected to V FB (see Figure 27) . This circuitry allows for remote
voltage sensing and adjustment.
Figure 27. Setting the AS1324 Output Voltage
0.6V ≤ V OUT ≤ 5.5V
R 2
5
R 1 <<R 2
AS1324
V FB
R 1
2
GND
Resistor values for the circuit shown in Figure 27 can be calculated as:
V OUT = 0,6 × 1 + -------
R 2
R 1
(EQ 7)
The output voltage can be adjusted by selecting different values for R 1 and R 2 . For R 1 a value between 10k ? and 500k ? is recommended. A
higher resistance of R 1 and R 2 will result in a lower leakage current at the output. It is recommended to keep V IN 500mV higher than V OUT .
www.ams.com/DC-DC_Step-Up/AS1324
Revision 1.06
13 - 21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1324-BTTT-12 | 功能描述:IC REG BUCK SYNC 1.2V TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| AS1324-BTTT-15 | 功能描述:IC REG BUCK SYNC 1.5V TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| AS1324-BTTT-18 | 功能描述:IC REG BUCK SYNC 1.8V TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| AS1324BTTTAD | 制造商:ams 功能描述:IC STEP-DOWN DC/DC CONVERTER 5-TSOT-23 |
| AS1324-BTTT-AD | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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