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AAT2505 参数 Datasheet PDF下载

AAT2505图片预览
型号: AAT2505
PDF下载: 下载PDF文件 查看货源
内容描述: 双通道,降压型转换器/线性稳压器 [Dual Channel, Step-Down Converter/Linear Regulator]
分类和应用: 转换器稳压器
文件页数/大小: 26 页 / 845 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT2505  
Dual Channel, Step-Down  
Converter/Linear Regulator  
Functional Block Diagram  
VCC  
VP  
FB  
Error  
Amp.  
DH  
See  
Note  
LX  
Logic  
Voltage  
Reference  
DL  
Control  
Logic  
PGND  
EN  
SGND  
VLDO  
OUT  
Over-Current  
Protection  
Error  
Amp.  
Fast Start  
Control  
ENLDO  
POK  
Voltage  
Reference  
94%  
+
-
GND  
Note: Internal resistor divider included for 1.2V versions. For low voltage versions, the feedback pin is tied directly to the error amplifier input.  
cuit which accelerates the power-up behavior of  
fundamental control and feedback circuits within  
Functional Description  
the LDO regulator. Fast turn-off time response is  
The AAT2505 is a high performance power man-  
achieved by an active output pull-down circuit,  
agement IC comprised of a buck converter and a  
which is enabled when the LDO regulator is placed  
linear regulator. The high efficiency buck convert-  
in shutdown mode. This active fast shutdown cir-  
er is capable of delivering up to 600mA. Designed  
cuit has no adverse effect on normal device opera-  
to operate at 1.4MHz, the converter requires only  
tion. The LDO regulator output has been specifi-  
three external components (CIN, COUT, and LX) and  
cally optimized to function with low-cost, low-ESR  
is stable with a ceramic output capacitor. The lin-  
ceramic capacitors; however, the design will allow  
ear regulator delivers 300mA and also is stable  
for operation over a wide range of capacitor types.  
with a ceramic output capacitor.  
Other features include an integrated Power-OK  
comparator which indicates when the output is out of  
Linear Regulator  
regulation. The POK open-drain output is low when  
The advanced circuit design of the linear regulator  
OUT is 6% below its nominal regulation voltage. The  
has been specifically optimized for very fast start-up  
open-drain signal is held low when the linear regula-  
and shutdown timing. This proprietary CMOS LDO  
tor is in shutdown mode. The regulator comes with  
has also been tailored for superior transient response  
complete short-circuit and thermal protection. The  
characteristics. These traits are particularly important  
combination of these two internal protection circuits  
for applications that require fast power supply timing.  
gives a comprehensive safety system to guard  
The high-speed turn-on capability is enabled  
through implementation of a fast-start control cir-  
against extreme adverse operating conditions.  
12  
2505.2006.06.1.1