【摘要】：隨著微電子技術(shù)的發(fā)展,移動(dòng)電話、平板電腦、數(shù)碼相機(jī)等小型電子產(chǎn)品的數(shù)量逐漸增加,這就對(duì)鋰離子電池的發(fā)展提出了更高的要求。鋰電池由于其諸多優(yōu)點(diǎn)而得到廣泛應(yīng)用。鋰離子電池與其他電池相比,具有高能量密度、高額定電壓、使用壽命長(zhǎng)、安全性能好、充電速度快、溫度適應(yīng)性強(qiáng)、綠色環(huán)保等優(yōu)點(diǎn)。但是,由于溫度問(wèn)題使鋰離子電池的容量容易衰退。且鋰離子電池?zé)o法耐受過(guò)熱、過(guò)充以及過(guò)放,錯(cuò)誤使用鋰離子電池甚至?xí)䦟?dǎo)致爆炸。這些缺陷使得鋰電池的保護(hù)顯得更為重要。本論文設(shè)計(jì)了一款高集成度、低功耗、高精度的鋰離子電池保護(hù)芯片。該芯片實(shí)現(xiàn)了芯片上集成MOSFET,等效阻抗為54m?RDS(ON)。只需要接一個(gè)外圍電容即可工作,應(yīng)用非常簡(jiǎn)便。集成度比一般鋰電池保護(hù)芯片高。同時(shí),采用電阻網(wǎng)絡(luò)修調(diào)通過(guò)提高帶隙基準(zhǔn)電壓的精度,來(lái)提高了整個(gè)芯片的精度。電壓精度范圍是-10mV~+10mV。為降低電流損耗,芯片設(shè)計(jì)了兩種休眠狀態(tài),休眠狀態(tài)1和休眠狀態(tài)2。休眠狀態(tài)1是系統(tǒng)電壓低于過(guò)放檢測(cè)電壓時(shí),將關(guān)閉相關(guān)的電流比較器以減小芯片功耗。休眠狀態(tài)2是系統(tǒng)溫度高于120℃時(shí),將關(guān)閉大部分模擬模塊以減小芯片功耗同時(shí)使芯片適當(dāng)降溫。正常工作情況下,典型電流值為2.04uA。休眠模式下,最大電流值為0.1uA。與一般鋰電池保護(hù)芯片相比,這款芯片有過(guò)溫保護(hù)的功能,且過(guò)溫保護(hù)模塊采用外部遲滯,可以根據(jù)過(guò)溫保護(hù)模塊輸出的不同,選擇不同的參考電壓。這樣不僅精確性得到了提高,而且降低了比較器的設(shè)計(jì)難度。該芯片同時(shí)具有鋰電池保護(hù)芯片的基本保護(hù)功能(過(guò)充電壓保護(hù)、過(guò)放電壓保護(hù)、過(guò)充電流保護(hù)以及過(guò)放電流保護(hù)),而且工作電流損耗十分低。它適用于所有需要鋰離子電池的電子產(chǎn)品。本芯片的制造工藝采用CSMC公司的0.25um的BCD工藝。電路設(shè)計(jì)采用Cadence公司的Spectre軟件進(jìn)行仿真。版圖設(shè)計(jì)采用calibre進(jìn)行DRC、ERC、LVS驗(yàn)證。所有仿真都是在VDD=3.5V下完成。系統(tǒng)整體仿真功能與預(yù)期設(shè)計(jì)一致。
[Abstract]:With the development of microelectronic technology, the number of small electronic products such as mobile phones, tablets, digital cameras and other small electronic products is increasing, which puts forward higher requirements for the development of lithium ion batteries. Lithium battery is widely used because of its many advantages. Compared with other batteries, lithium-ion batteries have the advantages of high energy density, high rated voltage, long service life, good safety performance, fast charging speed, strong temperature adaptability, green environmental protection and so on. However, due to temperature problems, lithium ion battery capacity is prone to decline. And lithium ion batteries can not withstand overheating, overcharge and overdischarge, the wrong use of lithium ion batteries can even lead to explosion. These defects make the protection of lithium batteries even more important. In this paper, a high-integrated, low-power, high-precision lithium ion battery protection chip is designed. The chip realizes integrated MOSFETs on chip with equivalent impedance of 54m?RDS (ON). Only need a peripheral capacitor to work, the application is very simple. The integration level is higher than the ordinary lithium battery protection chip. At the same time, the resistive network is used to improve the accuracy of the whole chip by improving the precision of the bandgap reference voltage. The voltage precision range is -10mV ~ 10mV. In order to reduce the current loss, the chip designed two kinds of dormant state, sleep state 1 and dormant state 2. When the system voltage is lower than the overplay detection voltage, the related current comparator is turned off to reduce the chip power consumption. When the system temperature is higher than 120 鈩，

本文編號(hào)：2139685