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MAX8903AETI

更新时间： 2024-11-09 11:14:27
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美信 - MAXIM 监控
页数 文件大小 规格书
30页 1298K
描述
2A 1-Cell Li DC-DC Chargers for USB and Adapter Power Thermistor Monitor

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MAX8903AETI 数据手册

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19-4410; Rev 4; 5/11  
2A 1-Cell Li+ DC-DC Chargers for USB  
and Adapter Power  
MX8903A–EGHJ/Y  
General Description  
Features  
o Efficient DC-DC Converter Eliminates Heat  
The MAX8903A–MAX8903E/MAX8903G/MAX8903H/  
MAX8903J/MAX8903Y are integrated 1-cell Li+ charg-  
ers and Smart Power Selectors™ with dual (AC adapter  
and USB) power inputs. The switch mode charger uses  
a high switching frequency to eliminate heat and allow  
tiny external components. It can operate with either  
separate inputs for USB and AC adapter power, or from  
a single input that accepts both. All power switches for  
charging and switching the load between battery and  
external power are included on-chip. No external  
MOSFETs, blocking diodes, or current-sense resistors  
are required.  
o 4MHz Switching for Tiny External Components  
o Instant On—Works with No/Low Battery  
o Dual Current-Limiting Inputs—AC Adapter or USB  
Automatic Adapter/USB/Battery Switchover to  
Support Load Transients  
50mΩ System-to-Battery Switch  
Supports USB Spec  
o Thermistor Monitor  
o Integrated Current-Sense Resistor  
o No External MOSFETs or Diodes  
o 4.1V to 16V Input Operating Voltage Range  
The MAX8903_ features optimized smart power control  
to make the best use of limited USB or adapter power.  
Battery charge current and SYS output current limit are  
independently set. Power not used by the system  
charges the battery. Charge current and SYS output cur-  
rent limit can be set up to 2A while USB input current can  
be set to 100mA or 500mA. Automatic input selection  
switches the system from battery to external power. The  
DC input operates from 4.15V to 16V with up to 20V pro-  
tection, while the USB input has a range of 4.1V to 6.3V  
with up to 8V protection.  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
28 Thin QFN-EP*  
MAX8903AETI+T  
MAX8903BETI+T  
MAX8903CETI+T  
MAX8903DETI+T  
MAX8903EETI+T  
MAX8903GETI+T  
MAX8903HETI+T  
MAX8903JETI+T**  
MAX8903YETI+T  
The MAX8903_ internally blocks current from the bat-  
tery and system back to the DC and USB inputs when  
no input supply is present. Other features include pre-  
qual charging and timer, fast charge timer, overvoltage  
protection, charge status and fault outputs, power-OK  
monitors, and a battery thermistor monitor. In addition,  
on-chip thermal limiting reduces battery charge rate  
and AC adapter current to prevent charger overheat-  
ing. The MAX8903_ is available in a 4mm x 4mm, 28-pin  
thin QFN package.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
**Future product—contact factory for availability.  
T = Tape and reel.  
Typical Operating Circuit  
The various versions of the MAX8903_ allow for design  
flexibility to choose key parameters such as system  
regulation voltage, battery prequalification threshold,  
and battery regulation voltage. The MAX8903B/  
MAX8903E/MAX8903G also includes power-enable on  
battery detection. See the Selector Guide section for  
complete details.  
AC  
ADAPTER  
OR USB  
LX  
CS  
DC  
SYS  
LOAD  
CURRENT  
CHARGE  
CURRENT  
CHARGE  
AND  
SYS LOAD  
SWITCH  
SYSTEM  
LOAD  
Applications  
PDAs, Palmtops, and  
Wireless Handhelds  
Portable Multimedia  
Players  
PWM  
STEP-DOWN  
Personal Navigation  
Devices  
Smart Cell Phones  
Mobile Internet Devices  
Ultra Mobile PCs  
BAT  
BATTERY  
USB  
USB  
MAX8903_  
GND  
Selector Guide appears at end of data sheet.  
Smart Power Selector is a trademark of Maxim Integrated  
Products, Inc.  
Pin Configuration appears at end of data sheet.  
________________________________________________________________ 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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