MAX6431:Low-Power, Single/Dual-Level Battery Monitors with Hysteresis

Low-Power, Single/Dual Level Battery Monitor with Internal Hysteresis Requires No External Components. Ideal for Single Cell Lithium or Multi-Cell Alkaline, NiMH, and NiCd Applications

The MAX6427-MAX6438 are single/dual-level battery monitors with internal hysteresis. These devices are offered with single (MAX6427/MAX6428/MAX6429, MAX6433/MAX6434/MAX6435) or dual (MAX6430/MAX6431/MAX6432, MAX6436/MAX6437/MAX6438) low-battery output indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system). These devices are ideal for monitoring single lithium-ion (Li+) cells or multicell alkaline/NiCd/NiMH power supplies. When the power-supply voltage drops below the specified low threshold, the low-battery output asserts. When the voltage rises above the specified high threshold, the low-battery output is deasserted following a 140ms minimum timeout period. The timeout period ensures that the supply voltages have stabilized before power-converter or microprocessor activity is enabled. The MAX6427-MAX6438 family is available with several monitoring options. The MAX6427/MAX6428/MAX6429 offer factory-trimmed battery-monitor thresholds, with a single low-battery output. The MAX6430/MAX6431/MAX6432 also feature factory-trimmed thresholds, but have two low-battery outputs. The MAX6433-MAX6438 have user-adjustable threshold voltages permitting the user to select the hysteresis range, and consequently the sensitivity of the system to noise. A wide hysteresis range also prevents chattering that can result due to battery recovery after load removal. Single low-battery outputs are supplied by the MAX6433/MAX6434/MAX6435 and dual low-battery outputs by the MAX6436/MAX6437/MAX6438. The MAX6427-MAX6438 family is available with three output logic options for convenient interface with system power circuitry or microprocessors. The family is offered in small SOT23 and SOT143 packages and is fully specified over temperature.

Key Features
  • Factory-Trimmed or User-Adjustable Threshold Options
    • Factory-Trimmed Low Thresholds from 1.6V to 2.1V or 2.6V to 3.1V in 100mV Increments (MAX6427-MAX6432)
    • Factory-Trimmed High Thresholds from 2.3V to 2.6V or 3.3V to 3.6V in 100mV Increments (MAX6427-MAX6432)
    • User-Adjustable Low/High Thresholds with 615mV Internal Reference (MAX6433-MAX6438)
  • Low Current (1µA, typ)
  • Single or Dual Low-Battery Outputs
  • Push-Pull active-low LBO, Open-Drain active-low LBO, and Open-Drain LBO Options
  • 140ms Minimum LBO Timeout Period
  • Immune to Short Battery Voltage Transients
  • Guaranteed Valid LBO Logic State to BATT = 1.0V
  • -40°C to +85°C Operating Temperature Range
  • Small 3, 4, 5 and 6-Pin SOT Packages
  • No External Components Required (MAX6427-MAX6432)
MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438: Typical Operating Circuit
MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438: 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
MAX6427-MAX6438 Data SheetMAX6427-MAX6438.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX64271.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
85ms to 300msNo WatchdogPower Fail Comparator/Low Battery Detect2.51.5SOT/3$1.42 @1k
MAX64281.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
SOT/3$1.69 @1k
MAX64330 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
SOT/5$1.69 @1k
MAX64340 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
SOT/5$1.69 @1k
MAX64350 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Open Drain
SOT/5$1.69 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6430Factory Fixed1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
85ms to 300msNo WatchdogPower Fail Comparator/Low Battery Detect2.51.5SOT/4$1.69 @1k
MAX6431Factory Fixed1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
SOT/4$1.69 @1k
MAX6436R/C Adjustable0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
SOT/6$1.42 @1k
MAX6437R/C Adjustable0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
SOT/6$1.69 @1k
Related Products
  • MAX6381:SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
  • MAX6378:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6379:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6376:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6380:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6377:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6375:3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors
  • MAX6808:Voltage Detectors
  • MAX6806:Voltage Detectors
  • MAX6807:Voltage Detectors
  • MAX6327:3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits
  • MAX6328:3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits
  • MAX6326:3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6431AGUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431AGUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431AHUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431AHUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431AIUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431AIUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431AJUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431AJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431BGUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431BGUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6431BHUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431BHUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431BIUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431BIUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431BJUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431BJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431CGUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431CGUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431CHUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431CHUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6431CIUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431CIUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431CJUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431CJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431DGUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431DGUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431DHUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431DHUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431DIUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431DIUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6431DJUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431DJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431EGUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431EGUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431EHUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431EHUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431EIUS-TNo Longer AvailableMAX6431EIUS+TSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431EJUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431EJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431FGUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6431FGUS-TNo Longer AvailableMAX6431FGUS+TSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431FHUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431FHUS-TNo Longer AvailableMAX6431FHUS+TSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431FIUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431FIUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431FJUS+TActiveSOT,;4 pin;8 mm²-40°C to +85°CLead Free
MAX6431FJUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431KQUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6431KQUS-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +85°CNo
MAX6431KRUS+TActiveSOT;-40°C to +85°CSee data sheet
MAX6427-MAX6438.pdf MAX6435
MAX6427-MAX6438.pdf MAX6438