USB Fuse

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.

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