MP26085

– CC/CV CONTROLLER

MP26085 Rev. 1.02

www.MonolithicPower.com

8

11/30/2015

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© 2015 MPS. All Rights Reserved.

APPLICATION INFORMATION

Setting the Constant Output Voltage

The output voltage is set by selecting the

resistive voltage divider ratio. The voltage

divider drops the charge voltage to the internal

voltage reference 1.223V,. Generally, use 10kΩ

for the low-side resistor of the voltage divider.

Determine the high-side resistor by the

equation:

1)

1.223V

V

(

R2

R1

O

−

×

=

Where R1 is the high-side resistor, R2 is the

voltage.

Setting

the

Constant

Output

Current

/Current Limitation

The output current is regulated effectively when

voltage on IREF pin of the MP26085 (assuming

that the internal current source is disabled).

measurement.

For general application (<1A), the voltage drop

parallel.

_IREF

SEN

O

V

R

I

=

through R3 and R4:

_IREF

REF

R4

VV

R3 R4

=×

+

The ratio of R3 and R4 determines the current

reference, and the sum of the resistances of R3

and R4 sets the current source. So, it is

recommended to set the sum of R3 and R4 to

then select a suitable ratio between R3 and R4

to achieve the current reference value.

Output Current Adjustment

If the ICON pin is left open or connected to 5V

SEN

_IREF

O

R

V

I

=

If ICON pin is connected to ground, the internal

current

source

is

enabled,

the

current

measurement is off-set by a voltage equal to:

REF

_OFFSET

V

VRif Ki

R3 R4

=× ×

+

This can be used to lower the output current for

trickle charge or eventually to stop the charge.