Datasheet Linear Technology LT1937 — Даташит

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Купить LT1937 на РадиоЛоцман.Цены — от 17 до 328 ₽ 17 предложений от 17 поставщиков Dual 1.3A White LED Step-Up Converters with Wide Dimming
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Экологический статус

Design Notes

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  White LED Driver in Tiny SC70 Package Delivers High Efficiency and Uniform LED Brightness &mdash DN315
  PDF, 88 Кб, Файл опубликован: 1 июл 2003
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  White LED Driver in Tiny SC70 Package Delivers High Efficiency
  and Uniform LED Brightness – Design Note 315
  David Kim
  Introduction
  The LTВ®1937 step-up white LED driver is an ideal solution for small battery-powered portable devices such as
  cellular phones, PDAs and digital cameras. The LT1937
  features an internal 36V switch that is capable of driving up to eight LEDs in series, but it is optimized for
  Li-Ion powered color display backlight applications that
  use two to four white LEDs. The LT1937 guarantees a
  constant light intensity and color in each LED, regardless of differences in their forward voltage drops due
  to a constant current step-up architecture that directly
  regulates the LED current. The constant 1.2MHz switching allows for the use of tiny external components and
  minimizes input and output ripple voltage—meeting
  the noise level requirements of products with sensitive
  wireless circuitry. The superior internal compensation
  of LT1937 lowers the output capacitor requirement to a
  single 0.22ОјF ceramic, saving space and cost. The low
  95mV feedback voltage and an efficient internal switch
  minimize power losses in the LT1937. The result is a
  typical efficiency of 84%. The LT1937 is available in the
  tiny SC70 or 1mm tall ThinSOTв„ў package.
  Li-Ion Powered Driver for Three White LEDs
  Figure 1 shows a white LED driver circuit that is …

Статьи

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  White LED Driver in Tiny SC70 Package Achieves 84% Efficiency &mdash LT Journal
  PDF, 160 Кб, Файл опубликован: 9 авг 2004
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  DESIGN IDEAS White LED Driver in Tiny SC70 Package
  Achieves 84% Efficiency
  by Pit-Leong Wong
  Introduction
  VIN
  3V–5V L
  22ВµH D 90
  CIN
  1ВµF VDC
  DIMMING
  VIN 85 SW
  91k
  5.1k LT1937
  SHDN FB
  R1
  4.02Ω GND CIN: TAIYO YUDEN JMK107BJ105
  COUT: AVX 0603YD224
  D: CENTRAL CMDSH-3
  L: MURATA LQH3C220 (408) 573-4150
  (843) 946-0362
  (516) 435-1110
  (814) 237-1431 LT1937
  FB D2 Figure 1. Li-Ion driver for …

Модельный ряд

Классификация производителя

• Power Management > LED Driver ICs > Step-Up (Boost) LED Drivers