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| 型号： | AS1324-AD EB |
| 厂商： | ams |
| 文件页数： | 11/21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
Figure 25. Single Li-Ion 1.8V/600mA Regulator for Low Output Ripple
V IN
2.7 to 4.2V
C IN
10μF
4
V IN
AS1324-18
3
SW
4.7μH
C OUT
22μF
V OUT
1.8V
600mA
1
EN
2
GND
5
V OUT
9.1 External Component Selection
9.2 Inductor Selection
For most applications the value of the external inductor should be in the range of 2.2 to 6.8μH as the inductor value has a direct effect on the
ripple current. The selected inductor must be rated for its DC resistance and saturation current. The inductor ripple current ( ? I L ) decreases with
higher inductance and increases with higher V IN or V OUT .
In Equation (EQ 2) the maximum inductor current in PWM mode under static load conditions is calculated. The saturation current of the inductor
should be rated higher than the maxim um in ductor current as calculated with Equation (EQ 3) . This is recommended because the inductor
current will rise above the calculated value during heavy load transients.
V OUT
? I L = V OUT × ------------------------
I LMAX = I OUTMAX + --------
1 – --------------
V IN
L × f
? I L
2
(EQ 2)
(EQ 3)
Where:
f = Switching Frequency (1.5 MHz typical)
L = Inductor Value
I Lmax = Maximum Inductor current
? I L = Peak to Peak inductor ripple current
The recommended starting point for setting ripple current is ? I L = 240mA (40% of 600mA).
The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation.
Thus, a 720mA rated inductor should be sufficient for most applications (600mA + 120mA). A easy and fast approach is to select the inductor
current rating fitting to the maximum switch current limit of the converter.
Note: For highest efficiency, a low DC-resistance inductor is recommended.
Accepting larger values of ripple current allows the use of low inductance values, but results in higher output voltage ripple, greater core losses,
and lower output current capability.
The total losses of the coil have a strong impact on the efficiency of the dc/dc conversion and consist of both the losses in the dc resistance and
the following frequency-dependent components:
1.
2.
3.
4.
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
www.ams.com/DC-DC_Step-Up/AS1324
Revision 1.06
11 - 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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