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S-8520A36MC-AVVT2x PDF预览

S-8520A36MC-AVVT2x

更新时间： 2024-09-19 00:18:03
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精工 - SII 开关
页数 文件大小 规格书
44页 2578K
描述
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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S-8520A36MC-AVVT2x 数据手册

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S-8520/8521 Series  
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE  
SWITCHING REGULATOR CONTROLLER  
www.sii-ic.com  
© SII Semiconductor Corporation, 1997-2010  
Rev.9.0_01  
The S-8520/8521 Series is a CMOS step-down switching regulator-controller with PWM control (S-8520 Series) and PWM  
/ PFM switching control (S-8521 Series). The S-8520/8521 Series has a reference voltage source, an oscillation circuit, an  
error amplifier, and other components.  
The S-8520 Series provides low-ripple power, high efficiency, and excellent transient characteristics due to a PWM control  
circuit capable of varying the duty ratio linearly from 0% up to 100%. The S-8520/8521 Series also has a soft-start circuit  
that prevents overshoot at startup.  
The S-8521 Series works with either PWM control or PFM control. It normally operates using PWM control with a duty ratio  
of 25% to 100%, but under a light load, it automatically switches to PFM control with a duty ratio of 25%. The S-8520/8521  
Series ensures high efficiency over a wide range of conditions for devices, from the standby mode to the operation.  
By adding external Pch power MOS FET or PNP transistor, coil, capacitor, and externally connected diode, the  
S-8520/8521 Series can function as a step-down switching regulator, and is ideal for power supply units of portable  
devices due to small SOT-23-5 and the feature of low current consumption. It is also ideal for AC adapters due to the input  
voltage up to 16 V.  
Features  
• Low current consumption During operation: 60 μA max. (A, B types)  
21 μA max. (C, D types)  
100 μA max. (E, F types)  
During shutdown: 0.5 μA max.  
• Input voltage:  
2.5 V to 16 V (B, D, F types)  
2.5 V to 10 V (A, C, E types)  
• Output voltage:  
• Duty ratio:  
Selectable between 1.5 V and 6.0 V in 0.1 V step  
0% to 100% PWM control (S-8520 Series)  
25% to100% PWM / PFM switching control (S-8521 Series)  
• External parts are Pch power MOS FET or PNP transistor, coil, diode, and capacitor only  
(When using PNP transistor, add base resistor and capacitor).  
• Oscillation frequency:  
180 kHz typ. (A, B types)  
60 kHz typ. (C, D types)  
300 kHz typ. (E, F types)  
• Soft-start function:  
8 ms. typ.  
(A, B types)  
12 ms. typ. (C, D types)  
4.5 ms. typ. (E, F types)  
• With a shutdown function  
• With a built-in overload protection circuit Overload detection time:  
4 ms. typ.  
(A type)  
14 ms. typ. (C type)  
2.6 ms. typ. (E type)  
• Lead-free, Sn 100%, halogen-free*1  
*1. Refer to “Product Name Structure” for details.  
1
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