A novel Li-ion battery charger using multi-mode LDO configuration based on 350 nm HV-CMOS

Abstract

The design of a novel Li-ion battery charger using multi-mode LDO architecture has been introduced in this paper. The proposed architecture, using an improved multi-mode LDO, not only obtains high accuracy but also reduces power supply noise because of utilizing novel error amplifier and power buffer configuration; while still consuming low power dissipation. To obtain the low power consumption, the Schmitt Trigger technique is applied to the charging controller and an optimized current driven circuit is proposed. Besides, the PSRR parameter is also enhanced by adding pre-regulation circuit in multi-mode LDO circuit. Thus, the proposed Li-ion battery charger achieves 700 mA operation current with 70.9 % efficiency but only dissipates 495 mW in power. During the charging process, the setting time and ripple issues are solved by the use of soft-start circuit which is integrated into the charging controller in order to decrease the chip area. Therefore, the setting time is reduced to 5.5 ls while gaining the load regulation at approximately 0.019 lV/mA and increasing PSRR up to 106 dB at DC level. Moreover, the line regulation is also reduced at 1.3 mV/V. The proposed linear battery charger is designed and implemented, based on High-Voltage CMOS process with using 4.5 V power supply voltage and obtaining 4.2 V battery output voltage.

A new Li-ion battery charger with charge mode selection based on 0.18 um CMOS for phone applications

“…To this day, many Li-Ion battery charger architectures have been published in the literature using CMOS technology [2][3][4][5][6][7][8][9][10][11][12][13][14]. As already stated, with these high performances, li-ion battery chargers became the most used for mobile applications.…”

Evolutionary Optimization Techniques in Analog Integrated Circuit Designs

“…Analog circuits play an essential role in integrated circuits (ICs) because they serve as the interface to connect the real world and the digital world signals. In contrast to the digital IC design strategy, the analog IC design has not been extensively automated due to its remarkable complexity [19,38]. Moreover, analog circuit sizing is considered highly composite, iterative, monotonous, and time-consuming.…”

A high efficiency and high speed charge of Li-Ion battery charger interface using switching-based technique in 180 nm CMOS technology

“…The switching based requires an advanced circuit design to realize a high efficiency, it gives a wide range of the input/output voltage [14]. Further more the switching based is costing a lot of drawbacks, like a worse noise repudiation as of the ripple at a switching rate, and rise power consumption [15].…”

“…In addition, these charging systems are typically integrated into a single chip to minimize circuit design complexity through the improvement of CMOS technology. Then, the battery charger is integrated into a System-on-Chip (SoC) to reduce the effect of ripple and noise [15]. Figure 2 shows the charging modes of Li-Ion battery that's consisted of four stages: the first one is the trickle charge (TC), the second one is the constant current (CC) charge, the third one is the constant voltage (CV) charge and the last one is the charge termination [16], [17].…”