Article

New Compact CMOS Li-Ion Battery Charger Using Charge-Pump Technique for Portable Applications

Dept. of Electron. Eng., Nat. Taipei Univ.
Circuits and Systems I: Regular Papers, IEEE Transactions on (Impact Factor: 2.4). 05/2007; 54(4):705 - 712. DOI: 10.1109/TCSI.2007.890605
Source: IEEE Xplore

ABSTRACT

This paper presents a new compact CMOS Li-Ion battery charger for portable applications that uses a charge-pump technique. The proposed charger features a small chip size and a simple circuit structure. Additionally, it provides basic functions with voltage/current detection, end-of-charge detection, and charging speed control. The charger operates in dual-mode and is supported in the trickle/large constant-current mode to constant-voltage mode with different charging rates. This charger is implemented using a TSMC 0.35-mum CMOS process with a 5-V power supply. The output voltage is almost 4.2 V, and the maximum charging current reaches 700 mA. It has 67.89% power efficiency, 837-mW chip power dissipation, and only 1.455times1.348 mm2 in chip area including pads

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    • "The same are characterized by high efficiency such as the DC/DC converter, switching-capacitor, or switching mode power supply [1, 6– 8], but they are not suitable for single chip integration and, sometimes, they have low accuracy despite their efficiency. On the other hand, the same are using charge pump as an adaptive supply voltage [3]; however this one is distinguished by its high current ripple and low efficiency. LDO-based charger is characterized by a low current ripple and it can be integrated into the chip without descript components [9], but its major problem is the low efficiency. "
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    ABSTRACT: This paper presents a high efficiency Li-ion battery LDO-based charger IC which adopted a three-mode control: trickle constant current, fast constant current, and constant voltage modes. The criteria of the proposed Li-ion battery charger, including high accuracy, high efficiency, and low size area, are of high importance. The simulation results provide the trickle current of 116 mA, maximum charging current of 448 mA, and charging voltage of 4.21 V at the power supply of 4.8–5 V, using 0.18 μ m CMOS technology.
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    • "III. HARVESTER SYSTEM DESIGN Nowadays, charging circuits (e.g., a power converter) using a charge pump have gained popularity in wireless sensor systems for their smaller form factors, simpler structures, and faster charging rate [14]–[16]. According to Sokal [16], the fastest and most efficient method to charge a capacitor is to use the maximum peak switch current. "
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    • "The Charger controller has duty of creating a feasible electro power for rechargeable battery and it must identify the point that is stopping charging to avoid rechargeable battery explosion [1] [2] [6] [9] [10]. The Constant-Current and Constant-Voltage (CC-CV) is used most broadly [1] [2] [3] [4] [6] [7] [9] [10] [11] [13] but its function is cannot give the customer all of their need. Therefore, the fuzzy control, are applied to approach better battery charging performance [20] [21] [17]. "

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