![]() But LDOs have excellent noise rejection performance, meaning they can take a noisy rail from a switching buck/boost converter with lots of transient or high-draw components on it, and create a much cleaner rail for lower-current, more sensitive devices. You’re right, using an LDO for a large voltage drop is not good electrical design. However, if an LDO is used to generate a 3.3V rail from a 5V rail, it is dropping just 1.7V, resulting in less power dissipation for the same load current. So an LDO dropping 18V to 5V could be very inefficient, more so when driving a higher current load as shown by the formula above. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f2:b293 Chicony Electronics Co., Ltd Bus 001 Device 002: ID 8087:0024 Intel Corp. ![]() USB 2.0 Card Reader Bus 002 Device 002: ID 8087:0024 Intel Corp. The transmission speed of USB has also evolved from the 12 Mbps of USB1.1 to the recent 480 Mbps of USB2.0. Since an LDO is a resistive element, yes, it burns off energy as heat in this process. Bus 002 Device 008: ID 05e3:070e Genesys Logic, Inc. (PCs) can be used to connect many universal serial bus (USB) peripherals, including USB keyboard, USB mouse, USB card reader, USB flash drive, external USB hard disk, USB printer, and USB scanner. While operating, an LDO is effectively a resistor that varies in real-time to ensure its output voltage stays stable despite changes in load current. In practise, the efficiency of an LDO regulator is dependent on how much voltage it is dropping.
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