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AMC7635-3.0 参数 Datasheet PDF下载

AMC7635-3.0图片预览
型号: AMC7635-3.0
PDF下载: 下载PDF文件 查看货源
内容描述: 300毫安CMOS低压差稳压器 [300mA CMOS LOW DROPOUT REGULATOR]
分类和应用: 稳压器
文件页数/大小: 9 页 / 154 K
品牌: ADDTEK [ ADDTEK CORP ]
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AMC7635  
APPLICATION INFORMATION  
VIN  
BP  
VOUT  
VIN  
VOUT  
EN  
AMC7635  
COUT  
CIN  
GND  
2.2uF  
1uF  
CBP  
1000pF  
GND  
Š Detailed Description  
The AMC7635 CMOS low dropout regulator contains a PMOS pass transistor, a voltage reference, an error  
amplifier, over-current protection, and thermal shutdown circuit.  
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal  
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision  
reference. Thermal shutdown and over-current circuits become active when the junction temperature exceeds  
150, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation  
is restored when the junction temperature drops below 120.  
Š External Capacitors  
The AMC7635 is stable with an output capacitor to ground of 2.2µF or greater. Ceramic capacitors have the  
lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the  
highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively  
expensive. One option is to parallel a 0.1  
low ESR, high capacitance, and low over-all cost.  
A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be  
at least 0.1 F to have a beneficial effect.  
A third capacitor can be connected between the BP pin and GND. This capacitor can be a low cost Polyester  
Film variety between the value of 0.001 ~ 0.01 F. A larger capacitor improves the AC ripple rejection, but also  
µF ceramic capacitor with a 10µF Aluminum Electrolytic. The benefit is  
µ
µ
makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges.  
All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This  
can be achieved with a "Star" connection.  
Š EN  
The EN pin is normally pulled to high. When shutdown, pulled low, the PMOS pass transistor shuts off, and  
all internal circuits are powered down. In this state, the quiescent current is less than 1  
like an electronic switch.  
µA. This pin behaves much  
Copyright © 2007 ADDtek Corp.  
7
DD078_A -- SEPTEMBER 2007