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SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference

Ideal for 2-Cell Battery Monitoring in Portable Equipment

Product Details

The MAX917–MAX920 nanopower comparators in space-saving SOT23 packages feature Beyond-the-Rails™ inputs and are guaranteed to operate down to +1.8V. The MAX917/MAX918 feature an on-board 1.245V ±1.5% reference and draw an ultra-low supply current of only 750nA, while the MAX919/MAX920 (without reference) require just 380nA of supply current. These features make the MAX917–MAX920 family of comparators ideal for all 2-cell battery applications, including monitoring/management.

The unique design of the output stage limits supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. This design also minimizes overall power consumption under dynamic conditions. The MAX917/MAX919 have a push-pull output stage that sinks and sources current. Large internal output drivers allow rail-to-rail output swing with loads up to 8mA. The MAX918/MAX920 have an open-drain output stage that makes them suitable for mixed-voltage system design.

Key Features

  • Ultra-Low Supply Current
    • 380nA per Comparator (MAX919/MAX920)
    • 750nA per Comparator with Reference (MAX917/MAX918)
  • Guaranteed to Operate Down to +1.8V
  • Internal 1.245V ±1.5% Reference (MAX917/MAX918)
  • Input Voltage Range Extends 200mV Beyond-the-Rails
  • CMOS Push-Pull Output with ±8mA Drive Capability (MAX917/MAX919)
  • Open-Drain Output Versions Available (MAX918/MAX920)
  • Crowbar-Current-Free Switching
  • Internal Hysteresis for Clean Switching
  • No Phase Reversal for Overdriven Inputs
  • Space-Saving SOT23 Package

Applications/Uses

  • 2-Cell Battery Monitoring/Management
  • Medical Instruments
  • Mobile Communications
  • Notebooks and PDAs
  • Sensing at Ground or Supply Line
  • Telemetry and Remote Systems
  • Threshold Detectors/Discriminators
  • Ultra-Low-Power Systems
Parametric specs for Comparators
tPD (ns) (typ) 22000
VOS (mV) (max) 5
VSUPPLY (Total) (V) (min) 1.8
VSUPPLY (Total) (V) (max) 5.5
# Comparators 1
Input Range Rail to Rail
to Neg. Rail
ICC per Comp. (µA) (max) 0.8
Logic Out Push-Pull
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/5
Budgetary
Price (See Notes)
$0.69 @1k
Parametric specs for Comparators + Reference
tPD (µs) (typ) 22
VOS (mV) (max) 10
VSUPPLY (V) (min) 1.8
VSUPPLY (V) (max) 5.5
# Comparators 1
Thresh. (V) 1.245
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/5
Budgetary
Price (See Notes)
$1.00 @1k
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Simplified Block Diagram

MAX917, MAX918, MAX919, MAX920: Typical Operating Circuit MAX917, MAX918, MAX919, MAX920: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Parameters

Parametric specs for Comparators
tPD (ns) (typ) 22000
VOS (mV) (max) 5
VSUPPLY (Total) (V) (min) 1.8
VSUPPLY (Total) (V) (max) 5.5
# Comparators 1
Input Range Rail to Rail
to Neg. Rail
ICC per Comp. (µA) (max) 0.8
Logic Out Push-Pull
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/5
Budgetary
Price (See Notes)
$0.69 @1k
Parametric specs for Comparators + Reference
tPD (µs) (typ) 22
VOS (mV) (max) 10
VSUPPLY (V) (min) 1.8
VSUPPLY (V) (max) 5.5
# Comparators 1
Thresh. (V) 1.245
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
SOT23/5
Budgetary
Price (See Notes)
$1.00 @1k

Key Features

  • Ultra-Low Supply Current
    • 380nA per Comparator (MAX919/MAX920)
    • 750nA per Comparator with Reference (MAX917/MAX918)
  • Guaranteed to Operate Down to +1.8V
  • Internal 1.245V ±1.5% Reference (MAX917/MAX918)
  • Input Voltage Range Extends 200mV Beyond-the-Rails
  • CMOS Push-Pull Output with ±8mA Drive Capability (MAX917/MAX919)
  • Open-Drain Output Versions Available (MAX918/MAX920)
  • Crowbar-Current-Free Switching
  • Internal Hysteresis for Clean Switching
  • No Phase Reversal for Overdriven Inputs
  • Space-Saving SOT23 Package

Applications/Uses

  • 2-Cell Battery Monitoring/Management
  • Medical Instruments
  • Mobile Communications
  • Notebooks and PDAs
  • Sensing at Ground or Supply Line
  • Telemetry and Remote Systems
  • Threshold Detectors/Discriminators
  • Ultra-Low-Power Systems

Description

The MAX917–MAX920 nanopower comparators in space-saving SOT23 packages feature Beyond-the-Rails™ inputs and are guaranteed to operate down to +1.8V. The MAX917/MAX918 feature an on-board 1.245V ±1.5% reference and draw an ultra-low supply current of only 750nA, while the MAX919/MAX920 (without reference) require just 380nA of supply current. These features make the MAX917–MAX920 family of comparators ideal for all 2-cell battery applications, including monitoring/management.

The unique design of the output stage limits supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. This design also minimizes overall power consumption under dynamic conditions. The MAX917/MAX919 have a push-pull output stage that sinks and sources current. Large internal output drivers allow rail-to-rail output swing with loads up to 8mA. The MAX918/MAX920 have an open-drain output stage that makes them suitable for mixed-voltage system design.

Simplified Block Diagram

MAX917, MAX918, MAX919, MAX920: Typical Operating Circuit MAX917, MAX918, MAX919, MAX920: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal