BQ2004SNG4

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Multi-Chemistry
Number of Cells:	--
Current - Charging:	Constant, Pulsed
Programmable Features:	Voltage
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	--
Voltage - Supply (Max):	5.5V
Interface:	--
Operating Temperature:	-20°C ~ 70°C (TA)
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	BQ2004

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PMIC - Battery Chargers: BQ2004SNG4 application field and working principle

Power Management IC (PMIC) is an integrated circuit designed to assist in regulating the supplied power from an external power source. Within the PMIC category, battery chargers are single-chip monolithic integrated circuits that are used in propelling the charge from the source of external receptacle. This article will discuss the application field and working principle of the BQ2004SNG4, a battery charger within this PMIC category.The BQ2004SNG4 is a bi-directional, synchronous switch-mode buck-boost battery charger and bidirectional displacement transceiver. This integrated circuit can be used effectively in multiple applications due to its ability to operate in both a voltage step-down (buck) and voltage step-up (boost) topology. This feature allows the BQ2004SNG4 to operate in boost mode while charging wall adapter, USB, or other power sources with 4V to 28V input voltage. It can also switch to buck mode when either the wall adapter, USB, or other power sources are removed.In terms of the working principle, the BQ2004SNG4 utilizes a voltage-mode synchronous buck/boost MOSFET control, which provides faster loop response and accuracy than current-based control. As with all synchronous buck/boost controllers, the two main components of the BQ2004SNG4 are the voltage-mode control loop, which regulates the output voltage, and the current-mode control loop, which regulates the inductor current. The output voltage of the BQ2004SNG4 is regulated using voltage-mode control, which monitors the output voltage and compares it to the voltage of a voltage reference. If the output voltage is higher than the reference voltage, the loop reduces the duty cycle of the switch to reduce the amount of output voltage; if the output voltage is lower than the reference voltage, the loop increases the duty cycle to increase the amount of output voltage. This loop ensures that the output voltage remains constant. In addition to the voltage-mode control loop, the current-mode control loop monitors the inductor current and compares it to the current reference. If the inductor current is higher than the reference current, the loop reduces the duty cycle of the switch; if the inductor current is lower than the reference current, the loop increases the duty cycle of the switch. This loop ensures that the inductor current is kept within a predetermined limit.The BQ2004SNG4 utilises internal voltage, current and temperature monitoring to increase the overall robustness. Furthermore, the device has an extensive array of safety features such as programmable output overvoltage, thermal shut down and input overvoltage protection. These features improve the overall reliability and ensure safe operation in all conditions.In conclusion, the BQ2004SNG4 is a sophisticated battery charger with a wide range of applications. This device utilises an advanced voltage-mode synchronous buck/boost MOSFET control and incorporates the latest in safety features. It provides a high level of efficiency and accurate regulation ensuring reliable operation in all conditions.

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