MAX8934DETI+

Series:	Smart Power Selector™
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Over Voltage
Charge Current - Max:	1.5A
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	6.6V
Interface:	USB
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-TQFN (4x4)
Base Part Number:	MAX8934

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Introduction

MAX8934DETI+ is an integrated solution for power management and battery charging applications. It is part of Maxim Library of Analog Semiconductor, which is dedicated to the development and production of high-performance analog and mixed-signal integrated circuits. The device features an integrated buck-boost 2A DC/DC converter and an advanced Battery Charger, including linear and trickle charging modes, with an internal current sense resistor that achieves a maximum output voltage accuracy of 1.5%.

Application Field

MAX8934DETI+ is specially developed for common battery-powered handheld devices such as smartphones, health monitors, media players, navigation systems, digital cameras, and more. The device integrates two main components, a buck-boost DC/DC converter and a Battery Charger. The integrated buck-boost DC/DC converter is designed to maximize efficiency during low-to-medium and high-to-low power range transitions. The device includes terminals for Lithium-Ion (Li-Ion) and Lead-Acid (PbA) battery types, making it suitable for both types of battery charging.

Working Principle

The MAX8934DETI+ integrates a buck-boost 2A DC/DC converter and an advanced Battery Charger. The buck-boost DC/DC converter automatically selects between buck or boost modes, depending on input and output voltages. The Battery Charger is designed to provide optimal charging accuracy, safety and performance. It supports linear and trickle charging modes, with an internal current sense resistor that achieves a maximum output voltage accuracy of 1.5%.The MAX8934DETI+ also supports dual-cell battery packs. It can balance charge each cell independently and monitor individual cell voltages. The device features over-voltage, under-voltage and over-temperature protections to enhance battery pack safety.

Conclusion

The MAX8934DETI+ is a versatile IC for Power Management and Battery Chargers applications. The device integrates an efficient buck-boost DC/DC converter with a linear and trickle charging modes for Li-Ion and PbA batteries. The integrated current sense resistor provides high-accuracy output voltages for both types of batteries. The device also features over-voltage, under-voltage and over-temperature protections, which enhance battery pack safety. With its integrated components and protection features, the MAX8934DETI+ is an ideal solution for battery-powered handheld devices.

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