收藏本站
AS1339
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 52. Efficiency Comparison of different
Inductors; V IN = 3.9V, V OUT = 1.0V
100
90
80
70
60
50
40
Figure 53. Efficiency Comparison of different
Inductors; V IN = 3.9V, V OUT = 1.5V
100
90
80
70
60
50
40
30
20
10
0
MLP2520S1R5S
MLP2520S2R2S
MLP2520S3R3S
EPL2014-222
EPL2014-332
EPL2014-472
30
20
10
0
MLP2520S1R5S
MLP2520S2R2S
MLP2520S3R3S
EPL2014-222
EPL2014-332
EPL2014-472
10
100
1000
10
100
1000
V REF = ------------- = 1 , 2 V
Output Current (mA)
Example
The following system should be designed:
- A supply with a Lithium-Ion Battery = 4.5V
- V OUT = 3.0V
- I OUTMAX = 500mA
For the first step V REF is calculated as shown in Equation (EQ 5) .
V OUT
2 , 5
V IN ≤ 2 , 69 × V REF
Output Current (mA)
(EQ 5)
(EQ 6)
Due to Equation (EQ 6) : V IN = 3.23V
If V IN is falling below 3.23V the device is going into Bypass mode (see Bypass Mode on page 17) .
Hence a 2.2μH coil is used, Δ I L can be calculated with Equation (EQ 3) : Δ I L = 227mA
With this result I MAX can be calculated with Equation (EQ 4) : I MAX = 614mA.
The saturation current of the coil should be chosen slightly higher than I MAX because heavy load transients could
increase the peak current. For a short period of time (~50μs) the peak inductor current can rise up to a value of approx-
imately 1.1A (p-channel MOSFET peak current limit). In this case a coil with a rated saturation current of ~800mA can
be chosen.
www.austriamicrosystems.com/DC-DC_Step-Down/AS1339
Revision 1.05
21 - 25
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
RB-1512S/H CONV DC/DC 1W 15VIN 12VOUT
MIC2545A-2BM IC SW CURR LIMIT HI SIDE 8-SOP
F971A336MCC CAP TANT 33UF 10V 20% 2312
RB-1509S/H CONV DC/DC 1W 15VIN 09VOUT
SB350-E3/54 DIODE SCHOTTKY 50V 3A AXIAL
MIC2505BN IC SW SGL 2A HIGH SIDE 8-DIP
MIC2505BM TR IC SW SGL 2A HIGH SIDE 8-SOIC
TAAB685K035G CAP TANT 6.8UF 35V 10% AXIAL
相关代理商/技术参数
AS1339-BWLT 功能描述:IC CONV BUCK 650MA 16-WLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件
AS1339-DB 制造商:ams 功能描述:Evaluation Board
AS1339-EB 功能描述:电源管理IC开发工具 AS1339 Evaluation Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
AS133R0HLF 制造商:TT Electronics / IRC 功能描述:AS133R0HLF
AS133R0JLF 制造商:TT Electronics / IRC 功能描述:AS133R0JLF
AS133R2FLF 制造商:TT Electronics / IRC 功能描述:AS133R2FLF
AS133R2HLF 制造商:TT Electronics / IRC 功能描述:AS133R2HLF
AS133R2JLF 制造商:TT Electronics / IRC 功能描述:AS133R2JLF