MAX6779: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.

Key Features
  • 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
MAX6775, MAX6776, MAX6777, MAX6778, MAX6779, MAX6780, MAX6781: Typical Operating Circuit
MAX6775, MAX6776, MAX6777, MAX6778, MAX6779, MAX6780, MAX6781: Typical Operating Circuit
Applications/Uses
  • Battery-Powered Systems (Single-Cell Li+ or Multicell NiMH, NiCd, Alkaline)
  • Cell Phones/Cordless Phones
  • Electronic Toys
  • MP3 Players
  • Pagers
  • PDAs
  • Portable Medical Devices
DataSheet
titleDownload file
MAX6775-MAX6781 Data SheetMAX6775-MAX6781.pdf
Parametrics
Part NumberFunctionsBattery TypeParameters MeasuredApplicationsBattery ProtectionVSUPPLY
(V)
VSUPPLY
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxSee Notes
MAX6775Status Monitor1 Cell Li-Ion
3-Cell NiMH
Current
Voltage
HostOver Voltage1.65.5µDFN/6
SC-70/5
-40 to +85$1.26 @1k

Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX67751.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
>=5.5
Active Low
Push-Pull
<1msNo WatchdogPower Fail Comparator/Low Battery Detect17µDFN/6
SC-70/5
$1.26 @1k
MAX6776Active Low
Open Drain
µDFN/6
SC-70/5
$1.24 @1k
MAX6777Active Low
Push-Pull
µDFN/6
SC-70/5
$1.63 @1k
MAX6778Active Low
Open Drain
µDFN/6
SC-70/5
$1.24 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6779R/C Adjustable1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
>=5.5
Active Low
Push-Pull
<1msNo WatchdogPower Fail Comparator/Low Battery Detect17µDFN/6$1.63 @1k
MAX6780Active Low
Open Drain
µDFN/6
Related Products
  • MAX6461:Ultra-Low-Power Voltage Detectors and µP Supervisory Circuits
  • MAX6428:Low-Power, Single/Dual-Level Battery Monitors with Hysteresis
  • MAX6429:Low-Power, Single/Dual-Level Battery Monitors with Hysteresis
  • MAX6427:Low-Power, Single/Dual-Level Battery Monitors with Hysteresis
  • MAX6375:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6779LTA+TActiveµDFN,;6 pin;1.6 mm²-40°C to +85°CLead Free
MAX6779LTB+ActiveµDFN,;6 pin;1.6 mm²-40°C to +85°CLead Free
MAX6779LTB+TActiveµDFN,;6 pin;1.6 mm²-40°C to +85°CLead Free
MAX6779LTC+ActiveµDFN,;6 pin;1.6 mm²-40°C to +85°CLead Free
MAX6779LTC+TActiveµDFN,;6 pin;1.6 mm²-40°C to +85°CLead Free
MAX6775-MAX6781.pdf MAX6775
MAX6775-MAX6781.pdf MAX6781