sparkfun/buck-boost

SparkFun Buck-Boost Converter allows you to fine tune the power your project receives with an input voltage of 3-16V and an output voltage of 2.5-9V.

SparkFun Buck-Boost Converter

SparkFun Buck-Boost Converter (15208)

Repository Contents

• /Hardware - Eagle design files (.brd, .sch)

Documentation

• Hookup Guide - Basic hookup guide for the SparkFun Buck-Boost Converter.

License Information

This product is open source!

Please review the LICENSE.md file for license information.

If you have any questions or concerns on licensing, please contact technical support on our SparkFun forums.

Distributed as-is; no warranty is given.

• Your friends at SparkFun.

buck-boost's Issues

v01 checklist

SCH:
(1) RSET note exceeds the frame

BRD:
(1) Dimension wire is 0.000008", should be 0.008"
(2) Jumper overlap errors need approval (DRC)
(3) PWR LED silk and PWR LED jumper silk are slightly off-center from pads
(4) tSTOP on C1 VIN pad is slightly overlapping the GND pour and could expose copper

EN disabled - High current consumption

Hi folks,

I'm not sure if the SparkFun Buck-Boost will ever see any hardware revisions, but I thought I'd report an issue and make a suggestion that doesn't require any modifications to the board, just a different resistance value.

When the Buck-Boost is disabled by pulling the EN pin LOW, the quiescent draw jumps significantly. This is due to the 10 kΩ pull-up resistor on the EN pin. For example, 5 V = 0.5 mA, 12 V = 1.2 mA. By comparison, the TPS63070 has a shut-down current of 2 uA.

The TPS63070 datasheet also states that "It is recommended to not connect EN directly to VIN but use a resistor in series in the range of 1kΩ to 1MΩ."

If the pull-up resistor was increased to 1MΩ, this would decrease the quiescent draw considerably (5 V = 5 uA and 12 V = 12 uA.

Is this something SparkFun could do in house?

Cheers,
Adam

P.S. Originally reported here: https://forum.sparkfun.com/viewtopic.php?f=103&t=54433&p=221143#p221143