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Maxim > Products > [Supervisors, Voltage Monitors, Sequencers] 
MAX6846, MAX6847, MAX6848, MAX6849
Low-Power, Adjustable Battery Monitors with Hysteresis and Integrated µP Reset

Adjustable Single-/Dual-Output Battery Monitors with Hysteresis and µP Supervisor Circuits in SOT23


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 264kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX6846-MAX6849 are a family of ultra-low-power battery monitors with integrated microprocessor (µP) supervisors. The user-adjustable battery monitors are offered with single or dual low-battery output options that can be used to signal when the battery is OK (enabling full system operation), when the battery is low (for low-power system operation), and when the battery is dead (to disable system operation). These devices also have an independent µP supervisor that monitors VCC and provides an active-low reset output. A manual reset function is available to reset the µP with a pushbutton.

The MAX6846-MAX6849 are ideal for single-cell lithium-ion (Li+) or multicell alkaline/NiCd/NiMH applications. When the battery voltage drops below each adjusted low threshold, the low-battery outputs are asserted to alert the system. When the voltage rises above the adjusted high thresholds, the outputs are deasserted after a 150ms minimum timeout period, ensuring the voltages have stabilized before power circuitry is activated or providing microprocessor reset timing.

These devices have user-adjustable battery threshold voltages, providing a wide hysteresis range to prevent chattering that can result due to battery recovery after load removal. Single low-battery outputs are supplied by the MAX6846/MAX6847 and dual low-battery outputs are supplied by the MAX6848/MAX6849. All battery monitors have open-drain low-battery outputs.

The MAX6846-MAX6849 monitor system voltages (VCC) from 1.8V to 3.3V with seven fixed reset threshold options. Each device is offered with two minimum reset timeout periods of 150ms or 1200ms. The MAX6846/ MAX6848 are offered with an open-drain RESET-bar output and the MAX6847/MAX6849 are offered with a push-pull RESET-bar output.

The MAX6846-MAX6849 are offered in a SOT23 package and are fully specified over a -40°C to +85°C temperature range.

Key Features   Applications/Uses
  • User-Adjustable Thresholds for Monitoring Single-Cell Li+ or Multicell Alkaline/NiCd/NiMH Applications
  • Single and Dual Low-Battery Output Options
  • Independent µP Reset with Manual Reset
  • Factory-Set Reset Thresholds for Monitoring 1.8V to 3.3V Systems
  • Available with 150ms (min) or 1.2s (min) VCC Reset Timeout Period Options
  • 150ms (min) LBO-bar Timeout Period
  • Immune to Short-Battery Voltage Transients
  • Low Current (2.5µA, typ at 3.6V)
  • -40°C to +85°C Operating Temperature Range
  • Small 8-Pin SOT23 Packages

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

    Key Specifications:  Supervisors (1 Monitored Voltage)
    Part Number Reset Thresh.
    (V)    		 Reset Out tRESET Watchdog Feature Supervisor Features Reset Thresh. Accur.
    (%)    		 ICC
    (µA)    		 Price
    Active Low min @ +25°C max See Notes
    MAX6846 
    0 to 1.2
    1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5
    		 Open Drain
    85ms to 300ms
    >1s
    		 No Watchdog
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 1.5 7 $1.30 @1k
    MAX6847  Push-Pull
    Manual Reset
    Power Fail Comparator/Low Battery Detect
    		 $1.30 @1k
    MAX6848  Open Drain Power Fail Comparator/Low Battery Detect $1.30 @1k
    MAX6849  Push-Pull Power Fail Comparator/Low Battery Detect $1.30 @1k
    See All Supervisors (1 Monitored Voltage) (274)

    Diagram
    MAX6846, MAX6847, MAX6848, MAX6849: Pin Configuration
    Pin Configuration

    Design Guides
  		• Microprocessor Supervisory (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Filter:
    Devices: 1-100 of 115
    1 2  --->

    MAX6846 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6846KARD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KASD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KATD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KATD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAVD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAVD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAWD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAYD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAYD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KAZD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6846KARD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KASD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KATD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KATD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAVD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAVD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAWD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAYD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAYD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAZD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KASD3+  
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6846KARD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6846KASD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6846KAWD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6846KAZD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6846KARD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KASD3+T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6846KAWD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6846KAZD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6847KARD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KASD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KATD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KATD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAVD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAVD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAWD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAYD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAYD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KAZD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6847KARD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KASD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KATD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KATD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAVD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAVD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAWD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAYD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAYD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAZD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KASD3+  
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6847KARD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6847KASD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6847KAWD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6847KAZD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6847KARD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KASD3+T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6847KAWD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6847KAZD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6848KASD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KATD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAVD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAVD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAWD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAYD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAYD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KAZD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6848KASD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KATD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAVD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAVD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAWD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAYD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAYD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAZD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KARD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KATD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KASD3+  
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6848KARD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KARD7-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KASD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KATD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KAWD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KAZD3-T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6848KARD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KASD3+T    
    		Active SOT;8 pin;9 mm²
    Outline Drawing: 21-0078 (PDF)
    Land Pattern: 90-0176 (PDF)
    Use pkgcode/variation: K8SN+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6848KAWD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6848KAZD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6849 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6849KARD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KASD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KATD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KATD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KAVD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KAWD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KAYD3-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KAYD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KAZD7-T    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX6849KARD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6849KASD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6849KATD3+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX6849KATD7+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    Filter:
    Devices: 1-100 of 115
    1 2  --->


    More Information
  		• Topmark Coding: MAX6846 MAX6847 MAX6848 MAX6849
  		• New Product Press Release 2003-08-25 

    Related Products
    MAX6439, MAX6440, MAX6441, MAX6442 Low-Power, Single-/Dual-Level Battery Monitors with Hysteresis and Integrated µP Reset
    MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438 Low-Power, Single/Dual-Level Battery Monitors with Hysteresis

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    Document Ref.: 19-2947; Rev 1; 2006-05-19
    This page last modified: 2009-10-12


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