Low-Power, 1%-Accurate Battery Monitor in µDFN and SC70 Packages

The MAX6775–MAX6781 low-power, 1%-accurate battery monitors are available in the ultra-small µDFN package (1.0mm x 1.5mm) and SC70 packages. These low-power devices are ideal for monitoring single lithium-ion (Li+) cells, or multicell alkaline/NiCd/NiMH power sources. These devices offer single (MAX6775/MAX6776/MAX6777/MAX6778) or dual (MAX6779/MAX6780/MAX6781) low-battery outputs and feature fixed or resistor-adjustable hysteresis. Hysteresis eliminates the output chatter sometimes associated with battery voltage monitors, usually due to input-voltage noise or battery terminal voltage recovery after load removal.

These devices are available in several versions: with single- or dual-voltage monitors, and with fixed or adjustable hysteresis. The MAX6775/MAX6776 offer a single battery monitor and factory-set hysteresis of 0.5%, 5%, or 10%. The MAX6779/MAX6780/MAX6781 have two battery monitors in a single package and factory-set hysteresis of 0.5%, 5%, or 10%. The MAX6777/MAX6778 offer a single battery monitor with external inputs for the rising and falling thresholds, allowing external hysteresis control.

For convenient interface with system power circuitry or microprocessors, both open-drain and push-pull outputs are available. The single-channel devices are available with open-drain or push-pull outputs. The dual-channel devices are available with both outputs open-drain, both outputs push-pull, or one of each (see the Selector Guide in the full data sheet). This family of devices is offered in small 5-pin SC70 and ultra-small 6-pin µDFN packages, and is fully specified over the -40°C to +85°C extended temperature range.

Applications

* Battery-Powered Systems (Single-Cell Li+ or Multicell NiMH, NiCd, Alkaline) * Cell Phones/Cordless Phones * Electronic Toys * MP3 Players * Pagers * PDAs * Portable Medical Devices

* 1.0%-Accurate Threshold Specified Over Temperature

* Single/Dual, Low-Battery Output Options

* Low 3µA Battery Current

* Open-Drain or Push-Pull Low-Battery Outputs

* Fixed or Adjustable Hysteresis

* Low-Input Leakage Current Allows Use of Large Resistors

* Guaranteed Valid Low-Battery-Output Logic State Down to VBATT = 1V

* Immune to Short Battery Transients

* Fully Specified from -40°C to +85°C

* Small 5-Pin SC70 or Ultra-Small 6-Pin µDFN (1mm x 1.5mm) Package