RD-171 LM5001: +/- 5V @ 250mA, 10 ~ 30V in


A very low noise differential power supply for split rail systems requiring low noise +5V and -5V (higher or lower voltage is possible). This design is fully isolated and capable of floating to over 500V differential from Vin to Vout (higher is possible).

The LM5001 IC is a fully integrated flyback regulator which performs all of the current mode control for tight regulation and transient response. The design is small and uses only one side of a double sided FR4 PCB for components.

This design provides very low noise bias rails for ground referenced analog circuitry (under 20 mV p-p total noise up to 1GHz). The design utilizes a very small size PCB footprint.


Manufacturer Texas Instruments
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Board not Stocked
Topology Step Down
Outputs and Type 2 Isolated
Voltage Out: Highest Current First ±5V
Current Out 250mA per Channel
Voltage In 10 ~ 30 V
Efficiency @ Conditions >77%, 30V in, ±5V @ 100 ~ 250 mA
Voltage Out Range - Not Given
Features Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 600 kHz
Standby Current [Typical] 95 µA
Quiescent Current [Typical] 3.1 mA
Component Count + Extras 35 + 2
Internal Switch Yes
Design Author Texas Instruments
Application / Target Market Audio: Powered Speakers
Standby Current [Maximum] 130 µA
Quiescent Current [Maximum] 4.5 mA
Main I.C. Base Part LM5001
Date Created By Author
Date Added To Library 2011-03