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A7566E6R-ADJ 参数 Datasheet PDF下载

A7566E6R-ADJ图片预览
型号: A7566E6R-ADJ
PDF下载: 下载PDF文件 查看货源
内容描述: [DC-DC CONVERTER BOOST MICROPOWER SYNCHRONOUS]
分类和应用: DC-DC转换器
文件页数/大小: 11 页 / 415 K
品牌: AITSEMI [ AiT Semiconductor ]
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A7566  
AiT Semiconductor Inc.  
www.ait-ic.com  
DC-DC CONVERTER BOOST(STEP-UP)  
1.2MHz, MICROPOWER SYNCHRONOUS  
Pulse Skipping Mode  
At very light load, the A7566 automatically switches into Pulse Skipping Mode to improve efficiency. During  
this mode, the PWM control will skip some pulses to maintain regulation. If the load increases and the output  
voltage drops, the device will automatically switch back to normal PWM mode and maintain regulation.  
Device Shutdown  
When CE is set logic high, the A7566 is put into operation. If CE is set logic low, the device is put into  
shutdown mode and consumes lower than 1μA current.  
Application  
Setting the Output Voltage: An external resistor divider is used to set the output voltage. The output voltage of  
the switching regulator (VOUT) is determined by the following equation:  
VOUT = 1.23V x [1 + (R1/R2)]  
Table 1 list the resistor selection for output voltage setting.  
Table 1 Resistor selection for output voltage setting  
VOUT  
3.3V  
5.0V  
R1(Ω)  
1.02M  
1.02M  
R2(Ω)  
604k  
332k  
Inductor Selection: The high switching frequency of 1.2MHz allows for small surface mount inductors. For  
most designs, the A7566 operates with inductors of 4.7µH to 10µH.The equation below can help to select the  
inductor, the maximum output current can be get by this equation; where η is the efficiency, IPEAK is the peak  
current limit, f is the switching frequency, L is the inductance value and D is the duty cycle.  
VIN x D  
IOUT= η x  
IPEAK  
-
x (1-D)  
[
]
2 x f x L  
Larger inductors mean less inductor current ripple and usually less output voltage ripple. Larger inductors also  
mean more load power can be delivered. But large inductors are also with large profile and costly. The  
inductor ripple current is typically set for 20% to 40% of the maximum inductor current. When selecting an  
inductor, the DC current rating must be high enough to avoid saturation at peak current. For optimum load  
transient and efficiency, the low DCR should be selected. Table 2lists some typical surface mount inductors  
that meet target applications for the A7566:  
REV1.1  
- APR 2015 RELEASE, MAR 2018 UPDATED -  
- 8 -