DIO1280B

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DIO1280B• 2.4

Over-Voltage Lockout (OVLO) Calculation:

OVLO can be set externally and override default OVP. By connecting an external resistor-driver to the OVLO pin.

Equation (1) can produce the desired trip voltage and resistor values.

[

]2

/

1

1

_

_

R

R

V

V

TH

OVLO

OVLO

IN

+

×

=

(1)

Recommended minimum R1=820kΩ.

On-The-Go (OTG) Functionality:

During OTG operation, the DIO1280B is initially disabled and the power FET’s bulk diode is forward biased. The

bulk diode represents ~0.7V drop across the device, which remains until the V_IN voltage increases past 2.5V,

when the device is fully enabled. While the device is disabled and the body diode is forward biased, the max DC

current through the diode is 1.8A. This current is limited by the thermal performance of the device (0.7V x

1.8A=1.36W). The #EN pin must be pulled LOW to ensure the device fully enables and the transient should not

exceed the RC time constant of the C_IN and C_OUT capacitors. At the system level, over-voltage and current

protection should be provided outside the DIO1280B.