参数资料
型号: AS1324-BTTT-AD
厂商: ams
文件页数: 15/21页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ TSOT23-5
设计资源: Design Support Tool
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 5.5 V
输入电压: 2.7 V ~ 5.5 V
PWM 型: 电流模式
频率 - 开关: 1.5MHz
电流 - 输出: 600mA
同步整流器:
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: 标准包装
供应商设备封装: TSOT-23-5
其它名称: AS1324-BTTT-ADDKR
AS1324
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9.9 Design Example
Figure 28 shows the AS1324 used in a single lithium-ion (3.7V typ) battery-powered mobile phone application. The load current requirement is
600mA (max) but most of the time the device will require only 2mA (standby mode current).
Figure 28. Design Example
V IN
4
3
2.2μH
V OUT
3.7V
C IN
V IN
SW
C OUT
2.2V
4.7μF
10μF
CER
1
EN
AS1324
2 GND
5
V FB
R 1
22pF
1M ?
R 2
375k ?
CER
For the circuit shown in Figure 28 , efficiency at low- and high-load currents is an important consideration when selecting the value for the
external inductor, which is calculated as:
L = -------------- × ? 1 – -------------- ?
f ? I L
V IN
L = ---------------------------------------------------- × ? 1 – ------------ ? = 2,48 μ H
3 , 7V ?
( 1,5MHz × 240mA )
V OUT V OUT
? ?
From (EQ 14) , substituting V OUT = 2.2V, V IN = 3.7V, ? I L = 240mA and f = 1.5MHz gives:
2,2V 2,2V
?
(EQ 14)
(EQ 15)
Therefore, a standard 2.2μH inductor should be used for this design.
For best overall efficiency use an inductor with a rating of 720mA or greater and less than 0.2 ? series resistance. C IN will require an RMS
current rating of at least 0.3A ? I LOAD(MAX) /2, whereas C OUT will require an ESR of less than 0.25 ? . In most cases, a ceramic capacitor will
satisfy this requirement.
For the feedback resistors, select the value for R 1 = 375k ? . R 2 can then be calculated from (EQ 7) to be:
R 2 = (V OUT /0.6 - 1)375k = 1000k ?
www.ams.com/DC-DC_Step-Up/AS1324
Revision 1.06
15 - 21
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