BQ2002SNTRG4

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The BQ2002SNTRG4 is an advanced standby switch charger IC that combines high efficiency, small size, low cost, and multi-chemistry charging capabilities into an integrated package; it is designed to charge Li-ion, Li-polymer, 4.2V NiMH, and NiCd batteries. The IC is capable of providing a precise charge current and voltage with a high degree of accuracy and low temperature instability. The device also can be used in a variety of applications to maximize space savings and cost, such as cell phones, digital media players, PDAs and other mobile applications.

The BQ2002SNTRG4 provides two separate buck converters for charging the battery and for supplying voltage to the system. The battery charger combines several features needed for the fast charging of Li-ion batteries: pre-charge, termination, fast-charge and maintenance charge. It can support 4.2V NiMH and Li-ion batteries with up to 3A charge current. The buck converter supplying the system is capable of delivering up to 5V/1A.

The input voltage range of the chip is 4.5V to 8.5V, allowing it to be used in a variety of USB and wall charger applications. The two switching converters are controlled by PWM signals generated independently by the device or by an external controller. The IC can be programmed to accept and interpret different digital signaling voltage levels, allowing designers to use a common control interface.

The key features of the device include:

• Integrated buck converters for charging and system supply.
• Input Voltage Range of 4.5V - 8.5V.
• Charge current of up to 3A and supply voltage up to 5V/1A.
• Robust switching control circuitry to ensure power is delivered efficiently to the load without excessive current consumption.
• Protection against overvoltage, overtemperature and overcurrent.
• Built-in Undervoltage Lockout (UVLO) to ensure safe operation.
• Integrated power switches for charging, system supply, and idle modes.
• Chip enable/disable control with external PWM signal.
• On-chip sequencing and sequencing control.
• Flexible PMIC support from NPN/PNP control modes.

The working principle for the BQ2002SNTRG4 is based on switching converters, or voltages regulators, which are used to convert a higher voltage source into a lower source. A switching converter consists of a switch, an inductor, a diode, and a capacitor. The switch controls the flow of current and the inductor acts as a storage element, storing the energy and releasing it as current whenever needed. The diode allows current to flow only in one direction preventing any back flow of energy and the capacitor is used to smooth out peaks and valleys in the voltage.

When the switch is turned on, current starts to flow through the inductor, storing energy in it. This causes a magnetic field to build up around the inductor, which then collapses when the switch is turned off. This causes the current to reverse polarity and generate a back EMF, which is used to supply the output voltage. The capacitor stores some of the energy from the inductor before it is discharged and helps to filter the output voltage.

BQ2002SNTRG4 is a PMIC - Battery Charger with features like multi-chemistry charging capabilities, switching converters, power switches and on-chip sequencing controls for charging efficiently, with high precision and in low temperature stability. It is used in a variety of applications maximizing space savings and cost such as cellphones, digital media players and PDAs.

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