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MAX1636EAP 参数 Datasheet PDF下载

MAX1636EAP图片预览
型号: MAX1636EAP
PDF下载: 下载PDF文件 查看货源
内容描述: 低电压,高精度降压型控制器,用于便携式CPU电源 [Low-Voltage, Precision Step-Down Controller for Portable CPU Power]
分类和应用: 控制器便携式
文件页数/大小: 24 页 / 220 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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Lo w -Vo lt a g e , P re c is io n S t e p -Do w n  
Co n t ro lle r fo r P o rt a b le CP U P o w e r  
P WM Co n t ro lle r  
The heart of the current-mode PWM controller is a  
multi-input, open-loop comparator that sums four sig-  
nals: the output voltage error signal with respect to the  
reference voltage, the current-sense signal, the inte-  
g ra te d volta g e -fe e d b a c k s ig na l, a nd the s lop e -  
compensation ramp (Figure 3).  
SKIP  
Table 3.  
PWM Table  
LOAD  
CURRENT  
SKIP  
MODE  
DESCRIPTION  
Pulse-skipping,  
Low  
Light  
Idle  
discontinuous inductor  
current  
The PWM controller is a direct-summing type, lacking a  
traditional error amplifier and the phase shift associat-  
ed with it. This direct-summing configuration approach-  
es ideal cycle-by-cycle control over the output voltage  
(Figure 4).  
Constant-frequency PWM,  
continuous inductor current  
MAX136  
Low  
High  
High  
Heavy  
Light  
PWM  
PWM  
PWM  
Constant-frequency PWM,  
continuous inductor current  
When SKIP = low, Idle Mode circuitry automatically  
optimizes efficiency throughout the load-current range.  
Idle Mode dramatically improves light-load efficiency  
Constant-frequency PWM,  
continuous inductor current  
Heavy  
CSH  
1X  
CSL  
FB  
2X  
REF  
CC  
gm  
BST  
R
Q
LEVEL  
SHIFT  
DH  
LX  
S
OSC  
SLOPE  
COMPENSATION  
30mV  
SKIP  
CURRENT  
LIMIT  
DAC  
SHOOT-  
THROUGH  
CONTROL  
CK  
COUNTER  
SHDN  
SOFT-START  
SYNCHRONOUS  
RECTIFIER CONTROL  
VL  
DL  
R
S
Q
LEVEL  
SHIFT  
-100mV  
PGND  
Figure 3. PWM Controller Functional Diagram  
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