LMR70503 Evaluation Module


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The LMR70503 is an inverting buck-boost converter with adjustable negative output voltage in a tiny 8-bump thin micro SMD package (0.84 mm × 1.615 mm × 0.6 mm). Its unique control method is designed to provide fast transient response, low outputnoise, high efficiency, and tight regulation in the smallest possible PCB area. The LMR70503 has built in soft start, peak currentlimit, minimum switching frequency limit, and Under Voltage Lock Out (UVLO), with no external compensation required. Forease of use, the EN pin is referred to the IC ground instead of the negative output voltage. The LMR70503 is operating inDiscontinuous Conduction Mode (DCM) in light load. The minimum switching frequency is limited to 500 kHz to avoid audiofrequency interference to other systems. Very small total solution size can be achieved with the tiny footprint of the LMR70503and the low external component count.

  • Tiny 8-Bump Thin Micro SMD Package: 0.84 mm × 1.615 mm × 0.6 mm
  • 2.8 V to 5.5 V Input Voltage Range
  • Adjustable Output Voltage: -0.9 V to -5.5 V
  • 320 mA Switch Current Limit
  • 500 kHz Minimum Switching Frequency
  • Ground Referred Enable Input
  • Under Voltage Lock Out (UVLO)
  • No External Compensation
  • Internal Soft Start
  • 1 μA Shutdown Supply Current
  • WEBENCH® Enabled
AC/DC & DC/DC converters (integrated FET)
LMR70503 2.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator
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Evaluation board

LMR70503EVM/NOPB — LMR70503 Evaluation Module

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Type Title Date
* EVM User's guide AN-2264 LMR70503 Demo Board (Rev. A) 25 Apr 2013
Certificate LMR70503EVM/NOPB EU Declaration of Conformity (DoC) 02 Jan 2019

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