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MAX8649

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 1932K
描述
1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

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MAX8649 数据手册

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19-4504; Rev 4; 6/11  
1.8A Step-Down Regulator with  
Remote Sense in 2mm x 2mm WLP  
/MX8649A  
General Description  
Features  
o 1.8A Guaranteed Output Current  
The MAX8649/MAX8649A high-efficiency DC-to-DC step-  
down switching regulators deliver up to 1.8A of output cur-  
rent. 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 program-  
mable from 0.75V to 1.38V. Remote sense ensures pre-  
cise DC regulation at the load. Total output error is less  
than 2% over load, line, and temperature.  
2
o I C Programmable V  
(750mV to 1.38V in 10mV  
OUT  
Steps)  
o Operates from 2.5V to 5.5V Input Supply  
o On-Chip FET and Synchronous Rectifier  
o Fixed 3.25MHz PWM Switching Frequency  
o Synchronizes to 13MHz, 19.2MHz, or 26MHz  
System Clock when Available  
o Small 1.0µH Inductor  
The ICs operate at a 3.25MHz fixed frequency. The high  
operating frequency minimizes the size of external com-  
ponents. The switching frequency of the converter can be  
synchronized to the master clock of the application. When  
synchronizing to an external clock, the ICs measure the  
frequency of the external clock to ensure that the clock is  
stable before changing the switching frequency to the  
external clock frequency.  
o Initial Accuracy 0.5% at 1.25V Output  
o 2% Output Accuracy Over Load, Line, and  
Temperature  
o Power-Save Mode Increases Light Load Efficiency  
o Overvoltage and Overcurrent Protection  
o 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
o 400kHz I C Interface  
o < 1µA Shutdown Current  
o 16-Bump, 2mm x 2mm WLP Package  
Ordering Information  
2
I C ADDRESS  
PART  
PIN-PACKAGE  
2
The ICs feature different I C addresses so that devices  
(WRITE/READ)  
may be used in a system. For a 2.5A version of this  
device, refer to the MAX8952 data sheet.  
MAX8649EWE+T  
16 WLP (0.5mm pitch)  
0xC0/0xC1  
MAX8649AEWE+T 16 WLP (0.5mm pitch)  
0xC4/0xC5  
Applications  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Note: All devices operate over the -40°C to +85°C temperature  
range.  
Cell Phones and Smartphones  
PDAs and MP3 Players  
Typical Operating Circuit  
Bump Configuration  
TOP VIEW  
(BUMPS ON BOTTOM)  
2.5V TO  
5.5V  
1.8V TO  
3.6V  
VID1  
MAX8649  
MAX8649A  
IN1  
A1  
AGND  
A2  
IN2  
A4  
+
IN2  
LX  
V
DD  
A3  
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  
SNS+  
SNS-  
C3  
SCL  
D3  
C4  
SYNC  
D4  
EN  
VID0  
VID1  
CPU  
V
SDA  
D2  
DD  
AGND  
D1  
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.  
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