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AS1321_1 PDF预览

AS1321_1

更新时间: 2022-12-20 06:17:00
品牌 Logo 应用领域
艾迈斯 - AMSCO 转换器
页数 文件大小 规格书
13页 1139K
描述
130mA Step-Up DC-DC Converter

AS1321_1 数据手册

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Datasheet  
AS1321  
130mA Step-Up DC-DC Converter  
1 General Description  
2 Key Features  
The AS1321 is a high-efficiency step-up DC-DC con-  
verter designed to generate a fixed output voltage of  
+5.0V.  
Fixed Output Voltage: +5.0V  
Output Current: Up to 130mA (@ 2V VBATT)  
Internal Synchronous Rectifier  
The AS1321 achieves an efficiency of up to 96%. The  
minimum input voltage is +1.5V, the output voltage is  
fixed at +5.0V, and output current is up to 130mA  
(@ 2V VBATT).  
Shutdown Mode Supply Current: Less Than 1µA  
Efficiency: Up to 96%  
In order to save power the AS1321 features a shutdown  
mode, where it draws less than 1µA. In shutdown mode  
the battery is connected directly to the output enabling  
the supply of real-time-clocks.  
Minimum Input Voltage: +1.5V  
Accurate Shutdown Low-Battery Cutoff Threshold  
The AS1321 provides a power-on reset output that goes  
high-impedance when the output reaches 90% of its reg-  
ulation point.  
Battery Input Connected to Pin OUT in Shutdown  
Mode for Backup Power  
6-pin SOT23 Package  
The SHDNN trip threshold of the AS1321 can be used  
as an input voltage detector that disables the device  
when the battery voltage falls to a predetermined level.  
An internal synchronous rectifier is included, which is  
parallel with the external Schottky diode.  
3 Applications  
The AS1321 is available in a 6-pin SOT23 package.  
The AS1321 is ideal for low-power applications where  
ultra-small size is critical as in medical diagnostic equip-  
ment, hand-held instruments, pagers, digital cameras,  
remote wireless transmitters, cordless phones, and PC  
cards.  
The device is also perfect as a local +5.0V supply or as  
a battery backup.  
Figure 1. AS1321 - Typical Application Diagram  
+5.0V  
2
5
Output  
BATT  
OUT  
COUT  
22µF  
R1  
100kΩ  
4
6
+1.5V to +5.0V  
Battery  
RESETN  
Output  
AS1321  
L1  
10µH  
LX  
RESETN  
CIN  
22µF  
1
3
On  
Off  
SHDNN  
GND  
www.austriamicrosystems.com  
Revision 1.02  
1 - 13  

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