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AS1322A-BTTT PDF预览

AS1322A-BTTT

更新时间： 2024-01-01 01:50:18
品牌 Logo 应用领域
艾迈斯 - AMSCO 转换器升压转换器
页数 文件大小 规格书
17页 553K
描述
Low Voltage, Micropower, DC-DC Step-Up Converters

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AS1322A-BTTT 技术参数

是否Rohs认证： 符合生命周期：Obsolete
包装说明：TSOP, TSOP6,.11,37Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.8控制模式：CURRENT-MODE
JESD-30 代码：R-PDSO-G6端子数量：6
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：TSOP
封装等效代码：TSOP6,.11,37封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE认证状态：Not Qualified
子类别：Switching Regulator or Controllers表面贴装：YES
最大切换频率：1500 kHz温度等级：INDUSTRIAL
端子形式：GULL WING端子节距：0.95 mm
端子位置：DUALBase Number Matches：1

AS1322A-BTTT 数据手册

 浏览型号AS1322A-BTTT的Datasheet PDF文件第4页浏览型号AS1322A-BTTT的Datasheet PDF文件第5页浏览型号AS1322A-BTTT的Datasheet PDF文件第6页浏览型号AS1322A-BTTT的Datasheet PDF文件第8页浏览型号AS1322A-BTTT的Datasheet PDF文件第9页浏览型号AS1322A-BTTT的Datasheet PDF文件第10页 
AS1322  
austriamicrosystems  
Data Sheet  
8 Detailed Description  
The AS1322/AS1322B can operate from a single-cell input voltage (VIN) below 1V, and feature fixed frequency  
(1.2MHz) and current mode PWM control for exceptional line- and load-regulation. With low RDS(ON) and gate charge  
internal NMOS and PMOS switches, the devices maintain high-efficiency from light to heavy loads.  
Modern portable devices frequently spend extended time in low-power or standby modes, switching to high power-  
drain only when certain functions are enabled. The AS1322A and the AS1322B are ideal for portable devices since  
they maintain high-power conversion efficiency over a wide output power range, thus increasing battery life in these  
types of devices.  
In addition to high-efficiency at moderate and heavy loads, the AS1322A includes an automatic powersave mode that  
improves efficiency of the power converter at light loads. The powersave mode is initiated if the output load current  
falls below a factory programmed threshold (see Figure 3 on page 5).  
Note: The AS1322B does not support powersave mode and provides continuous operation at light loads, eliminating  
low-frequency VOUT ripple at the expense of light load efficiency.  
Figure 15. Block Diagram  
L1  
4.7µH  
1
SW  
1.5V  
Single  
Cell  
6
Start Up  
OSC  
2.3V  
–
+
3.3V  
Output  
VOUT  
Good  
VIN  
A
B
A/B  
MUX  
5
CIN  
1µF  
VOUT  
PWM  
Control  
0.45Ω  
0.35Ω  
Sync Drive  
Control  
R1  
1.02MΩ  
CFF*  
Current  
Sense  
1.2MHz  
Ramp  
Generator  
Σ
Slope  
Compensator  
1%  
AS1322  
COUT  
4.7µF  
+
3
PWM  
Comp  
–
–
–
FB  
gm Error  
Amp  
+
RC  
4
Shutdown  
Control  
Shutdown  
80kΩ  
CC  
CP2  
2.5pF  
R2  
640kΩ  
1%  
SHDNN  
1.23V  
Ref  
Powersave  
Operation  
Control  
150pF  
Powersave  
2
GND  
* Optional  
Low-Voltage Start-Up  
The AS1322 requires VIN of only 0.85V (typ) or higher to start up. The low-voltage start-up circuitry controls the internal  
NMOS switch up to a maximum peak inductor current of 850mA (typ), with 1.5ms (approx.) off-time during start-up,  
allowing the devices to start up into an output load.  
With a VOUT > 2.3V, the start-up circuitry is disabled and normal fixed-frequency PWM operation is initiated. In this  
mode, the AS1322 operates independent of VIN, allowing extended operating time as the battery can drop to several  
tenths of a volt without affecting output regulation. The limiting factor for the application is the ability of the battery to  
supply sufficient energy to the output.  
www.austriamicrosystems.com  
Revision 1.03  
7 - 17  
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