DS2711ZB+

PMIC - Battery Chargers

The DS2711ZB+ is an IC solution from Maxim Integrated, specifically developed for advancedcharging systems that require accurate power delivered to applications operating from a battery source.This IC providesa battery charging solution for applications requiring a two-stage chargecontroller. This IC implements a two-stage charge current profile whichoptimizes the balance between rapid and accurate charging. The operationof the charge current profile can be modified by changing the signalfrom several external components. Additionally, the IC can be configuredto meet the needs of different battery chemistries by exchanging batterytemperature compensation components.

Application Field

A typical application of the DS2711ZB+ can be seen in multi-chemistry battery charger systemswhere the battery type and its properties (LiIon, LiPolymer, NiMH, etc.) can be determined bythe user. The DS2711ZB+ provides a two-stage charging profile based on the sensed batterytype and configuration of an external pass transistor. This two-stage charging profile minimizesthe large temperature gradients normally seenin battery charging systems, which in turn minimizebattery deterioration.

The DS2711ZB+ is also suitable for charging systems that need to charge multiple batterystypes or multiple batteries in the same system. The IC\'s capability to detect and maintaintemperature at different levels for each battery type allows for better system performance, asspecific temperatures can be maintained for each chemistries. Additionally, the IC can beswitched easily between different chemistries or contain a charge profile setting that canreadjust the voltage or current outputs to optimize charging levels.

Working Principle

At the heart of the DS2711ZB+ is a Charge Control Engine (CCE), which is responsible forthe management of charge current and charge voltage according to the user-defined settingand the sensedbattery type. The CCE is responsible for setting the maximum current and voltageoutputs, monitoring battery discharge current, and providing temperature control. The CCEmonitorsthe temperature of the battery and uses external components to set temperature thresholdsfor eachchemistry.

The CCE\'s current management system also includes an externaldirectional current limiting circuit based on external PMOSand/or NMOS transistors. This allows for more efficient chargingand prevents current overloads in the system. Additionally, the CCEincludes an adjustable threshold values for charge current andvoltage, allowing for optimization of charging current and voltagevalues depending on the battery or load.

In addition to current and voltage management, the DS2711ZB+ provides several safetysafeguards to protect the battery or system from overcurrent, over temperature or over voltageconditions. The IC also provides an interface which allows for monitoring the health of thebattery and system, allowing the user to maintain optimum performance with very little effort.