【应用】圣邦微BUCK-BOOST芯片SGM62112用于遥控器,输入电压范围1.8V-5.5V,采用TDFN封装
锂电池相比较传统的电池具有重量轻、能量高、可循环使用(充电)等特点,因此在多个领域都得到了广泛的应用,如手表、手机、玩具、电脑等都要有用到锂电池。市面上比较常见的类型是标称电压3.7V的锂电池,它一般满电电压4.2V,亏电电压2.7V,锂电池可以串联、并联使用。
图一 遥控器电源部分系统框图
单节锂电池电压2.7V-4.2V,如果需要给3.3V系统供电,如上图可充电遥控器产品,要将锂电池稳压到3.3V才能使用。4.2V变到3.3V一般用BUCK或LDO降压即可,但是当锂电池电量下降时输出电压降到3.3V附近,BUCK或LDO就不工作了,但此时锂电池还有电量没有用完。
图二 SGM62112-3.3参考应用电路
如上述情况,要用尽锂电池电量以延迟遥控器的使用时间,可使用BUCK-BOOST自动升降压芯片实现稳压的目的。圣邦微推出了一款适用于单锂电池稳压的型号SGM62112,该系列有3.3V固定输出和可调节输出版本,开关电流1.8A,完全满足遥控器的应用要求:
1.输入电压范围1.8V-5.5V,完全覆盖锂电池电压范围;
2.输出电流大,满足遥控器1A的应用需求(大多数都用不到1A);
3.采用TDFN封装,节约PCB空间;
4.带散热盘且耐温125℃,可靠性高;
5.开关频率1.4MHZ,可减小配套电感体积;
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