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VLF3012

更新时间： 2024-11-12 11:58:55
品牌 Logo 应用领域
美信 - MAXIM 集成电源管理电路手持设备
页数 文件大小 规格书
44页 829K
描述
PMIC with Integrated Charger and Smart Power Selector for Handheld Devices

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19-0885; Rev 0; 8/07  
PMIC with Integrated Charger and  
Smart Power Selector for Handheld Devices  
MA8671X  
General Description  
Features  
The MAX8671X integrated power-management IC  
(PMIC) is ideal for use in portable media players and  
other handheld devices. In addition to five regulated  
output voltages, the MAX8671X integrates a 1-cell lithi-  
um ion (Li+) or lithium polymer (Li-Poly) charger and  
Smart Power Selector™ with dual (AC-to-DC adapter  
and USB) power inputs. The dual-input Smart Power  
Selector supports end products with dual or single  
power connectors. All power switches for charging and  
switching the system load between battery and external  
power are included on-chip. No external MOSFETs are  
required.  
♦ 16V-Tolerant USB and DC Inputs  
♦ Automatically Powers from External Power or  
Battery  
♦ Operates with No Battery Present  
♦ Single-Cell Li+/Li-Poly Charger  
♦ Three 2MHz Step-Down Regulators  
Up to 96% Efficiency  
♦ Two Low I Linear Regulators  
Q
♦ Output Power-Up Sequencing  
♦ Thermal-Overload Protection  
Maxim’s Smart Power Selector makes the best use of  
limited USB or AC-to-DC adapter power. Battery  
charge current and input current limit are independent-  
ly set. Input power not used by the system charges the  
battery. Charge current and DC current limit are pro-  
grammable up to 1A while USB input current can be set  
to 100mA or 500mA. Automatic input selection switches  
the system load from battery to external power. Other  
features include overvoltage protection, charge status  
and fault outputs, power-OK monitors, charge timer,  
and battery thermistor monitor. In addition, on-chip  
thermal limiting reduces battery charge rate to prevent  
charger overheating.  
Ordering Information  
PKG  
CODE  
PART  
TEMP RANGE PIN-PACKAGE  
40 Thin QFN-EP*  
5mm x 5mm  
MAX8671XETL+ -40°C to +85°C  
T4055-1  
+Denotes a lead-free package.  
*EP = Exposed paddle.  
Simplified Applications Circuit  
The MAX8671X offers adjustable voltages for all out-  
puts. Similar parts with factory-preset output voltages  
are also available (contact factory for availability).  
MAX8671X  
DC  
SYS  
AC-TO-DC  
ADAPTER  
Applications  
Portable Audio Players  
GPS Portable Navigators  
USB  
USB  
+
Li+/LiPo  
BATTERY  
ON  
EN  
OFF  
OUT1  
1V TO V  
425mA  
OUT1  
OUT2  
OUT3  
SYS  
SYS  
SYS  
PWM  
OUT2  
1V TO V  
425mA  
PEN1  
PEN2  
USUS  
CEN  
OUT3  
1V TO V  
425mA  
μP  
OUT4  
0.6V TO V  
180mA  
CST1  
CST2  
DOK  
OUT4  
OUT5  
SYS  
UOK  
OUT5  
0.6V TO V  
SYS  
180mA  
Smart Power Selector is a trademark of Maxim Integrated  
Products, Inc.  
________________________________________________________________ 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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