LMR61428 SIMPLE SWITCHER® Voltage Regulator

By Texas Instruments 95

LMR61428 SIMPLE SWITCHER® Voltage Regulator

Texas Instruments' LMR61428 is a step-up, DC-DC switching regulator for battery-powered and low input voltage systems that can achieve efficiencies up to 90%. It has a wide input voltage range from 1.2 V to 14 V and a possible regulated output voltage range of 1.24 V to 14 V. It has an internal 0.17 Ω N-Channel MOSFET power switch.

The high switching frequency of up to 2 MHz of the LMR61428 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology, very high efficiencies are realized over a wide load range. The supply current is reduced to 80 µA because of the BiCMOS process technology.

  • 1.2 V to 14 V input voltage
  • Adjustable output voltage up to 14 V
  • Switch current up to 2.85 A
  • Up to 2 MHz switching frequency
  • Low shutdown Iq, <1 µA
  • Boost/SEPIC conversions from 3.3 V, 5 V, 12 V
  • Space-constrained applications
  • LCD displays
  • LED applications

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