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LTC3331

更新时间： 2024-09-18 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 电池转换器
页数 文件大小 规格书
34页 563K
描述
具能量收集电池充电器的毫微功率降压-升压型 DC/DC 转换器

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中文翻译

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LTC3331 数据手册

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LTC3331  
Nanopower Buck-Boost  
DC/DC with Energy Harvesting  
Battery Charger  
FEATURES  
DESCRIPTION  
The LTC®3331 integrates a high voltage energy harvesting  
power supply plus a buck-boost DC/DC powered from a  
n
Dual Input, Single Output DC/DCs with Input  
Prioritizer  
n
Energy Harvesting Input: 3.0V to 19V Buck DC/DC  
Battery Input: Up to 4.2V Buck-Boost DC/DC  
10mA Shunt Battery Charger with Programmable  
Float Voltages: 3.45V, 4.0V, 4.1V, 4.2V  
Low Battery Disconnect  
rechargeable battery to create a single output supply for  
alternativeenergyapplications.A10mAshuntallowssimple  
charging of the battery with harvested energy while a low  
battery disconnect function protects the battery from deep  
discharge. The energy harvesting power supply, consisting  
of an integrated full-wave bridge rectifier and a high voltage  
buck DC/DC, harvests energy from piezoelectric, solar, or  
magnetic sources. Either DC/DC converter can deliver en-  
ergy to a single output. The buck operates when harvested  
energy is available, reducing the quiescent current draw  
on the battery to the 200nA required by the shunt charger,  
thereby extending the life of the battery. The buck-boost  
n
n
n
n
n
n
n
Ultra Low Quiescent Current: 950nA at no Load  
Integrated Supercapacitor Balancer  
Up to 50mA of Output Current  
Programmable DC/DC Output Voltage, Buck UVLO,  
and Buck-Boost Peak Input Current  
n
n
n
Integrated Low-Loss Full-Wave Bridge Rectifier  
Input Protective Shunt: Up to 25mA at V ≥ 20V  
IN  
5mm × 5mm QFN-32 Package  
powers V  
only when harvested energy is unavailable.  
OUT  
A supercapacitor balancer is also integrated, allowing for  
increased energy storage. Voltage and current settings  
for both inputs and outputs are programmable via pin-  
strapped logic inputs. The LTC3331 is available in a 5mm  
× 5mm QFN-32 package.  
APPLICATIONS  
n
Energy Harvesting  
n
Solar Powered Systems with Battery Backup  
Wireless HVAC Sensors and Security Devices  
n
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners.  
Mobile Asset Tracking  
TYPICAL APPLICATION  
AC1  
AC2  
SW  
PIEZO  
22µH  
22µH  
+
SOLAR  
PANEL  
3V TO 19V  
Charging a Battery with Harvested Energy  
MIDE  
V
IN  
V25W  
LTC3331  
22µF  
25V  
1µF  
6.3V  
SWA  
SWB  
V
OUT  
–
50mV/DIV  
CAP  
4.7µF, 6.3V  
AC-COUPLED  
1.8V TO 5V  
V
V
OUT  
IN2  
EH_ON  
50mA  
4V/DIV  
100k  
0V  
CHARGE  
BB_IN  
SCAP  
47µF  
6.3V  
10mF  
2.7V  
4.7µF  
6.3V  
I
BB_IN  
BAT_OUT  
BAL  
200mA/DIV  
0A  
10mF  
2.7V  
BAT_IN  
EH_ON  
0A  
CHARGE  
1mA/DIV  
4.7µF  
6.3V  
Li-Ion  
BATTERY  
+
I
PGVOUT  
OUT[2:0]  
OPTIONAL  
2
3
3
4
FLOAT[1:0]  
LBSEL  
ACTIVE ENERGY HARVESTER ENABLES  
CHARGING OF THE BATTERY IN SLEEP  
IPK[2:0]  
UV[3:0]  
3331 TA01b  
BAT = 3.6V  
100µs/DIV  
SHIP  
V
= 1.8V  
OUT  
I
= 50mA  
LOAD  
V
IN3  
0.1µF  
6.3V  
GND  
3331 TA01a  
3331fc  
For more information www.linear.com/LTC3331  
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