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AAT2782

更新时间： 2024-01-25 02:04:21
品牌 Logo 应用领域
ANALOGICTECH 集成电源管理电路
页数 文件大小 规格书
22页 3102K
描述
Triple Output PMIC: Dual Buck with Low-VIN LDO

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AAT2782 数据手册

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PRODUCT DATASHEET  
AAT2782  
TM  
SystemPower  
Triple Output PMIC: Dual Buck with Low-VIN LDO  
General Description  
Features  
•
•
•
•
The AAT2782 provides three independently regulated  
DC outputs: two step-down (Buck) regulators and a  
single low input voltage, low drop-out (LDO) regulator.  
The input voltage range for the step-down regulators is  
2.7V to 5.5V, while the LDO regulator allows inputs from  
1.5V to 5.5V. The low input voltage LDO regulator allows  
high efficiency, step-down, low noise outputs. In addi-  
tion, the LDO input may be connected to step-down  
outputs 1 or 2.  
VIN Range Step-Down (Buck): 2.7V to 5.5V  
VIN Range Low Drop-Out (LDO): 1.5V to 5.5V  
Output Voltage Range: 0.6V to VIN  
Step-Down Output Current:  
Channel 1: 1200mA  
Channel 2: 600mA  
LDO Output Current:  
▪
▪
•
•
Channel 3: 400mA  
High Efficiency with Low RDS(ON) Switches  
▪
Step-Down up to 97%  
LDO Regulator up to 80%  
Total Quiescient Current 170µA  
Shutdown Current: 1µA  
Step-Down Converters  
▪
The Channel 1 and 2 step-down regulators can deliver up  
to 1200mA and 600mA output current, respectively.  
Step-down output voltages are set with external resis-  
tors. Switching frequency is set at 1.3MHz to ensure  
small external filtering components. Current mode con-  
trol assures fast transient response and stable operation  
across the operating range. The Channel 3 LDO regulator  
can deliver up to 400mA with -80dB power supply rejec-  
tion ratio (PSRR) and 65µVRMS output noise with an  
optional bypass capacitor. The LDO output voltage is fac-  
tory set with a default voltage of 1.20V. Independent  
enable and input pins are provided. The device consumes  
low quiescent current and provides high efficiency across  
the load range for maximum life in battery systems.  
▪
•
•
•
1.3MHz Switching Frequency  
Current Mode Control  
Cycle-by-Cycle Current Limit  
High Efficiency Light-Load Mode Operation  
▪
▪
▪
▪
•
LDO Converter  
Ultra Low Noise with Bypass Capacitor  
Over-Current Protection  
200µs Internal Soft Start  
Over-Temperature Protection  
TDFN34-16 Low Profile Package  
-40°C to 85°C Temperature Range  
▪
▪
•
•
•
•
The AAT2782 is available in the Pb-free, 16-pin TDFN34  
package and is rated over the -40°C to 85°C operating  
temperature range.  
Applications  
•
•
•
•
•
Cellular and SmartPhones  
Microprocessor / DSP Core / IO Power  
PDAs and Handheld Computers  
Portable Media Players  
Wireless Data Systems  
Typical Application  
VIN  
2.7V –5.5V  
L1  
1.5µH  
AAT2782  
VOUT1  
1.2V, 1.2A  
LX1  
VP1  
R5  
59.0k  
EN1  
VIN  
C8  
FB1  
10µF  
C1  
10µF  
C4  
0.1µF  
R4  
59.0k  
AGND  
GND1  
LX2  
VOUT2  
1.7V, 0.6A  
L2  
2.2µH  
VP2  
EN2  
R3  
107k  
C5  
FB2  
4.7µF  
R2  
59.0k  
GND2  
GND2  
VOUT3  
1.2V, 400mA  
VIN = VOUT2  
OUT3  
BYP  
VIN3  
EN3  
C7  
0.01µF  
C2  
C3  
2.2µF  
AGND  
10µF  
EP  
w w w . a n a l o g i c t e c h . c o m  
2782.2008.05.1.0  
1
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