Article
USB Fuse
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The MAX1562 is a purpose-built USB current limiter from the chip manufacturers Maxim. The device operates with a supply voltage from 4.0 to 5.5 V with an operating current of typically 40 µA or 3 µA in standby mode. The circuit introduces a very low resistance in the power line (typically 26 mOhm but guaranteed less than 50 mOhm) from an internal MOSFET. The FET gate bias voltage is generated on-chip from a charge pump circuit.
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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PCB
Component list
Resistors
R1 = 5k6 (SMD 1206)
R2 = 1k5 (SMD 1206)
P1 = 10k preset
Capacitors
C1 = 1µF (SMD 1206)
C2 = 4µF7 10 V, tantalum
C3 = 220nF (SMD 1206)
Semiconductors
D1 = LED, low current
IC1 = MAX1562ESA
PCB, ref. 060024-1
R1 = 5k6 (SMD 1206)
R2 = 1k5 (SMD 1206)
P1 = 10k preset
Capacitors
C1 = 1µF (SMD 1206)
C2 = 4µF7 10 V, tantalum
C3 = 220nF (SMD 1206)
Semiconductors
D1 = LED, low current
IC1 = MAX1562ESA
PCB, ref. 060024-1
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