ISL9237HRZ-TK

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion
Number of Cells:	1 ~ 3
Current - Charging:	--
Programmable Features:	--
Fault Protection:	Over Current, Over Temperature, Over Voltage
Charge Current - Max:	--
Battery Pack Voltage:	--
Voltage - Supply (Max):	23.4V
Interface:	I²C, USB
Operating Temperature:	-10°C ~ 100°C (TA)
Package / Case:	32-VFQFN Exposed Pad
Supplier Device Package:	32-QFN (4x4)

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Introduction

The ISL9237HRZ-TK is a single cell, linear charging Li-Ion/Li-Pol battery charger that achieves industry-leading charge times. It utilizes a charging topology that greatly reduces external components, including a discrete low dropout regulator (LDO) or boost regulator circuit. The ISL9237HRZ-TK has been designed to meet the industry needs for space-saving, cost-effective and efficient charging applications. This application field and working principle paper will explain the device in detail.

Application Field

The ISL9237HRZ-TK is ideal for use in single-cell Li-Ion/Li-Pol applications such as smartphones, tablets, wearables and IoT devices. The fast charge time and low quiescent current consumption make it an ideal solution for applications where space and power are a premium. The device can handle up to 1A of input current while still delivering a high efficiency, allowing it to be used in a variety of applications where power and charge time are of the essence.

Design Summary

The ISL9237HRZ-TK utilizes a buck-boost charging topology that provides increased precision and reliability without the need for additional passive components. The device operates in two modes depending on the input voltages:* If the input voltage is lower than battery voltage, the device will operate in buck-boost mode, stepping up the battery voltage with a high efficiency.* If the input voltage is higher than battery voltage, the device will operate in boost mode, stepping down the input voltage and providing an efficient charge.The ISL9237HRZ-TK utilizes a fixed input voltage of 4.3V and an adjustable charge current up to 1A. The design also features a low quiescent current consumption of 2.2uA, allowing the device to be used in low power applications. In addition, the device includes integrated current, voltage and temperature monitoring, allowing it to be monitored and controlled easily.

Features and Benefits

The ISL9237HRZ-TK provides a range of features and benefits that enable efficient and reliable charging:* Flexible input voltage range of 4.3V - 24V* Adjustable charge current up to 1A* Low quiescent current consumption of 2.2µA* Fast charge times* Internal LDO for voltage regulation and input voltage monitoring* Integrated current, voltage and temperature monitoring* End of charge (EOC) detection* Stable output voltage over temperature range

Conclusion

The ISL9237HRZ-TK is an efficient, reliable and space-saving Li-Ion/Li-Pol battery charger that is ideal for a wide range of applications where space and power are a premium. The buck-boost topology allows the device to operate with a wide range of input voltages, while the adjustable charge current and low quiescent current consumption make it suitable for even the most power-constrained applications. The integrated current, voltage and temperature monitoring, along with the EOC detection, make the device an excellent choice for efficient and reliable charging.

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