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Design Notes

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  Ultralow Power Comparators Include Reference &mdash DN123
  PDF, 83 Kb, File published: Feb 2, 1996
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  Ultralow Power Comparators Include Reference
  Design Note 123
  Robert Reay
  With the explosion of battery-powered products has
  come the need for circuits that draw as little supply
  current as possible in order to extend battery life. Linear
  Technology’s new family of micropower comparators
  with built-in references is designed to meet that need.
  Drawing only 1ОјA of supply current per comparator, the
  LTC ®1440–LTC1445 family provides the perfect solution to battery-powered system monitoring problems. 7
  3 IN+ +
  8 4 IN – OUT – 5 HYST
  6 REF
  2.4M
  5% The LTC1440–LTC1445 family features 1μA comparators, adjustable hysteresis, TTL/CMOS outputs that sink
  and source current and a 1ОјA reference that can drive
  a bypass capacitor of up to 0.01ОјF without oscillation.
  The parts operate from a 2V to 11V single supply or a
  ±1V to ±5V dual supply. Each comparator’s input voltage
  range swings from the negative supply rail to within
  1.3V of the positive supply. The comparator propagation
  delay is 12Ојs with a 10mV overdrive, and the supply
  current glitches that commonly occur when comparators change logic states have been eliminated. Table 1 …

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  New Comparators Feature Micropower Operation Under All Conditions &mdash DN137
  PDF, 443 Kb, File published: Sep 2, 1996
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  New Comparators Feature Micropower Operation
  Under All Conditions – Design Note 137
  Jim Williams
  Some micropower comparators have operating modes
  that allow excessive current drain. In particular, poorly
  designed devices can conduct large transient currents
  during switching. Such behavior causes dramatically
  increased power drain with rising frequency, or when
  the inputs are nearly balanced, as in battery monitoring
  applications. resulting in greatly reduced power consumption versus
  frequency, or when the inputs are nearly balanced. Figure 2’s
  plot contrasts the LTC1440’s power consumption versus
  frequency with that of another comparator specified as a
  micropower component. The LTC1440 has about 200 times
  lower current consumption at higher frequencies, while
  maintaining a significant advantage below 1kHz. Figure 1 shows a popular micropower comparator’s current
  consumption during switching. Trace A is the input pulse,
  trace B is the output response and trace C is the supply
  current. The device, specified for micropower level supply drain, pulls 40mA during switching. This undesirable
  surprise can upset a design’s power budget or interfere
  with associated circuitry’s operation. Table 1 shows some LTC1440 family characteristics. A voltage reference and programmable hysteresis are included
  in some versions, with 5Вµs response time for all devices. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their …

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Manufacturer's Classification

• Signal Conditioning > Comparators > Micropower Comparators | Application Specific Comparators
• Signal Conditioning > Voltage References > Reference Plus Comparator or Amplifier

Other Names:

LTC1445ISPBF, LTC1445IS PBF