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MAX8649_10

更新时间： 2024-11-18 11:14:35
品牌 Logo 应用领域
美信 - MAXIM 调节器
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31页 1864K
描述
1.8A Step-Down Regulator with Differential Remote Sense in 2mm x 2mm WLP

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19-4504; Rev 1; 2/10  
1.8A Step-Down Regulator with Differential  
Remote Sense in 2mm x 2mm WLP  
MAX8649  
General Description  
Features  
The MAX8649 high-efficiency DC-to-DC step-down  
switching regulator delivers up to 1.8A of output current.  
The device operates from a 2.5V to 5.5V input voltage  
range, making it future proof for next-generation battery  
technologies. The output voltage is I2C programmable  
from 0.75V to 1.38V. Fully differential remote sense  
ensures precise DC regulation at the load. Total output  
error is less than 2% over load, line, and temperature.  
♦ 1.8A Guaranteed Output Current  
2
♦ I C Programmable V  
(750mV to 1.38V in 10mV  
OUT  
Steps)  
♦ Operates from 2.5V to 5.5V Input Supply  
♦ On-Chip FET and Synchronous Rectifier  
♦ Fixed 3.25MHz PWM Switching Frequency  
♦ Synchronizes to 13MHz, 19.2MHz, or 26MHz  
The MAX8649 operates at a 3.25MHz fixed frequency.  
The high operating frequency minimizes the size of exter-  
nal components. The switching frequency of the converter  
can be synchronized to the master clock of the applica-  
tion. When synchronizing to an external clock, the  
MAX8649 measures the frequency of the external clock to  
ensure that the clock is stable before changing the  
switching frequency to the external clock frequency.  
System Clock when Available  
♦ Small 1.0µH Inductor  
♦ Initial Accuracy 0.5% at 1.25V Output  
♦ 2% Output Accuracy Over Load, Line, and  
Temperature  
♦ Power-Save Mode Increases Light Load Efficiency  
♦ Overvoltage and Overcurrent Protection  
♦ Thermal Shutdown Protection  
An on-board DAC allows adjustment of the output volt-  
age in 10mV steps. The output voltage can be pro-  
grammed directly through the I2C interface, or by  
preloading a set of on-board registers and using the  
two VID logic signals to select the appropriate register.  
Other features include internal soft-start control circuitry  
to reduce inrush current, output overvoltage, overcur-  
rent, and overtemperature protection.  
2
♦ 400kHz I C Interface  
♦ < 1µA Shutdown Current  
♦ 16-Bump, 2mm x 2mm WLP Package  
Ordering Information  
Applications  
PART  
TEMP RANGE  
PIN-PACKAGE  
Cell Phones and Smartphones  
16 Bump WLP  
(0.5mm pitch)  
MAX8649EWE+T  
-40°C to +85°C  
PDAs and MP3 Players  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Typical Operating Circuit  
Pin Configuration  
TOP VIEW  
(BUMPS ON BOTTOM  
2.5V TO  
5.5V  
0V TO  
4.0V  
VID1  
A3  
IN1  
A1  
AGND  
A2  
IN2  
A4  
+
MAX8649  
IN2  
LX  
V
DD  
10µF  
0.1µF  
0.1µF  
1µH  
10µF  
2.5V TO  
5.5V  
V
OUT  
(0.75V TO  
1.38V)  
SNS+  
B1  
EN  
B2  
LX  
B3  
LX  
B4  
SCL  
SDA  
0.1µF  
11Ω  
PGND  
IN1  
PGND  
PGND  
SNS-  
C1  
VID0  
C2  
2.2µF  
0.1µF  
FSYNC  
C3  
SCL  
D3  
C4  
SYNC  
D4  
EN  
SNS+  
SNS-  
VID0  
VID1  
V
SDA  
D2  
DD  
CPU  
D1  
AGND  
WLP 0.5mm PITCH  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
1234567...31

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