EXT

CHARGE

INT

IN

Δt

C

I

C

V

=

´

-

LOAD

IN

C LOAD

C

V

Δt

I

-

´

=

TPS25910

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SLUSAR6B – SEPTEMBER 2012 – REVISED MARCH 2013

The TPS25910 can be used with applications that require constant turn-on currents. The current is controlled by

a single capacitor from the GATE terminal to ground. The TPS25910 internal MOSFET appears to operate as a

source follower (following the gate voltage) in this implementation. Choose a time to charge,

Δt, based on the

W ÷ VIN.

(11)

To select the gate capacitance:

(12)

•

•

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