USB Power Supply 1.1

Eric Lieser
254
9
0
1
Non-isolated revision of 0-30V USB power supply.
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USB Power Supply 1.1
USB Power Supply 1.1

physics_fy physics_fy

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Open Web Foundation Contributor License Agreement 1.0 / OWF-CLA 1.0

Published: March 17, 2015 Concept

Project Description

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Project description
Issues with this rev: 1. GOOD_BAT on U1 should be pulled high 2. Need divider to monitor USB_VBUS, dio pin on proc 3. Need USB_VBUS voltage monitor, adc pin on proc 4. Need USB current monitor INA199 (TI) 5. Input inductance for USB_VBUS? 6. Need to move bulk caps of USB_VBUS up closer to mosfet 7. Add bulk capacitance to BUS 8. Use ADC pins that are all in a row, so the scan time is not wasted.
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Component (67)
Qty
Description
Capacitor

C12

1
Generic Capacitor (22uF)
LP2980IM5-3.3NOPB

VR1

1
TI LDO Reg 3.3V 50mA
S5B-ZR-SM4A-TF(LF)(SN)

J4

1
Standard
Capacitor

C1

1
Generic Capacitor (100nF)

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