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AAT2688 参数 Datasheet PDF下载

AAT2688图片预览
型号: AAT2688
PDF下载: 下载PDF文件 查看货源
内容描述: 对于12V适配器系统4.5A PMIC解决方案有2个输出高性能降压型转换器 [4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters]
分类和应用: 转换器集成电源管理电路
文件页数/大小: 20 页 / 3687 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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PRODUCT DATASHEET  
AAT2688  
TM  
SystemPower  
4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters  
Functional Block Diagram  
VINT  
Reg.  
OT  
VL1  
IN1  
OSC  
.
Comp  
FB1  
BST1  
Error  
Amp  
30mΩ  
COMP1  
Logic  
LX1  
Control  
Logic  
EN 1  
Voltage  
Ref  
20Ω  
PGND  
GND1  
DL1  
RS1  
OS1  
Comp  
OT  
IN2  
OCP  
FB_LDO  
Error  
Amp  
OUT2  
Logic  
FB_LDO  
Voltage  
Ref 2  
Control  
Logic  
EN2  
GND2  
winding resistance. An external resistor network adjusts  
the current limit according to the DC winding resistance  
of the desired inductor and the desired output current  
limit. Frequency reduction limits over-current stresses  
during short-circuit events. The operating frequency  
returns to the nominal setting when over-current condi-  
tions are removed.  
Functional Description  
The AAT2688 provides two independently regulated DC  
outputs; consisting of a high voltage synchronous step-  
down (Buck) regulator and a low input voltage linear low  
dropout (LDO) regulator. The PMIC is optimized for low  
cost 12V adapter inputs, making the device the ideal  
system-on-a-chip power solution for consumer commu-  
nications equipment.  
Channel 2 is a low-dropout (LDO) regulator providing up  
to 600mA output current at a factory set output voltage.  
The device provides low output noise, low quiescent cur-  
rent, and excellent transient response.  
Channel 1 is a step-down (Buck) regulator with an input  
voltage range 6.0 to 24V; providing up to 4.5A output  
current. 490kHz fixed switching frequency allows small  
L/C filtering components.  
The regulators include integrated over-current, soft-start  
and over-temperature protection. Independent input and  
enable pins provide maximum design flexibility.  
Channel 1 utilizes voltage mode control configured for  
optimum performance across the entire output voltage  
and load range. The regulator includes integrated over-  
current, soft-start and over-temperature protection.  
Over-current is sensed through the output inductor DC  
The AAT2688 is available in the Pb-free 4x5 mm 24-pin  
TQFN package. The rated operating temperature range is  
-40°C to 85°C.  
w w w . a n a l o g i c t e c h . c o m  
10  
2688.2008.06.1.0