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 output noise, high efficiency, and tight regulation in the smallest possible PCB area. The LMR70503 has built in soft start, peak current limit, minimum switching frequency limit, and Under Voltage Lock Out (UVLO), with no external compensation required. For ease of use, the EN pin is referred to the IC ground instead of the negative output voltage. The LMR70503 is operating in Discontinuous Conduction Mode (DCM) in light load. The minimum switching frequency is limited to 500 kHz to avoid audio frequency interference to other systems. Very small total solution size can be achieved with the tiny footprint of the LMR70503 and 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

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LMR70503 Evaluation Module


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Technical Documents
User guides (1)
Title Type Size (KB) Date
PDF 729 25 Apr 2013
More literature (1)
Title Type Size (KB) Date
PDF 39 02 Jan 2019

TI Devices (1)

Part Number Name Product Family
LMR70503  2.8V to 5.5V, 300mA Buck/Boost Negative Output Voltage Regulator  Buck-boost & inverting 

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