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AS1323_04

更新时间： 2022-05-11 01:48:38
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
15页 1170K
描述
1.6μA Quiescent Current, Single Cell, DC-DC Step-up Converter

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AS1323_04 数据手册

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AS1323  
Datasheet - Detailed Description  
8 Detailed Description  
The AS1323 is a compact, high-efficiency, step-up DC-DC converter guaranteed to start up with voltages as low as 0.95V, and operate with an  
input voltage down to 0.75V. Consuming only 1.6µA of quiescent current, the device includes an integrated synchronous rectifier that eliminates  
the need for an external diode and improves overall efficiency by minimizing losses (see Synchronous Rectification on page 8). The AS1323 also  
features an active-low shutdown circuit that supply current to 0.1µA.  
Figure 20. Block Diagram  
L1  
4
1
OUT  
VBATT  
CIN  
0.95 to  
1.6V  
COUT  
Comparator  
Discharge  
Comparator  
Voltage  
Control  
Logic  
Startup  
Syste
Tim
5
3
LX  
SHDNN  
AS1323  
Ref  
Comrator  
Charge  
2
VSS  
8.1 PFM Control  
A forced discontinuous, current-limited, puse-frequency modulation (PFM) control scheme provides ultra-low quiescent current and high  
efficiency over a wide output current-rang. Rater than using an integrated oscillator, the inductor current is limited by the 400mA N-channel  
current limit or by the 6µs switch maxium on-time. After each device-on cycle, the inductor current must ramp to zero before another cycle can  
start. When the error comparator snses that the output has fallen below the regulation threshold, another cycle can begin.  
8.2 Synchronous Rectification  
The integrated synchronus rectifier eliminates the need for an external Schottky diode, reducing cost and PCB space. During normal operation,  
while the inductodischarges, the P-channel MOSFET turns on and shunts the MOSFET body diode. Consequently the rectifier voltage drop is  
significantly redud improving efficiency without the need for external components.  
8Low-Voltage Startup Circuit  
The A1323 contains a unique low-voltage startup circuit which ensures start-up even with very high load currents. The minimum start-up  
voltage is independent of the load current. This device is powered from pin VBATT, guaranteeing startup at input voltages as low as 0.95V.  
8.4 Shutdown  
The AS1323 enter shutdown when the SHDNN pin is driven low. During shutdown, the output is completely disconnected from the battery.  
Shutdown can be pulled as high as 3.6V, regardless of the voltage at pins VBATT or VOUT. For normal operation, connect SHDN to the input.  
www.austriamicrosystems.com/DC-DC_Step-Up/AS1323  
Revision 1.07  
8 - 14  
1...6789101112...15

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