2.4.2 Boost Converter Solution

Figure 3 shows the TLV61048 boost converter, which is the main circuit of TIDA-050033. Most of the external components are selected based on the suggestion in the data sheet. The device operates at 600kHz (FREQ = floating) for higher efficiency and higher duty cycle. An external 3.3 V bias supply is applied at VIN pin so the device can operate down to 1.3 V. When Vbus exists, TLV61048 stops switching so it consumes minimum current, only 100uA (typical). Once Vbus fails, TLV61048 could work immediately and provide 12 V supply seamlessly.

Figure 3. TLV61048 Boost Converter