LV5710GP

No.A1899-5/6

Output Voltage Setting Method

The output voltage of IC-incorporated LDO can be determined as follows :

VH =

R1+R2

R2

× VREF

For example, to set the output voltage to 12V, set the resistance

Value to R1 = 1070k

Ω/R2 = 130kΩ.

Short-circuit Protective Operation

The RO output pin has the short-circuit protective function.

The over-current detector circuit outputs the detection signal when the output current of 50mA (typ) or more flows or

when the output voltage drops below 87.5% (typ). When this detection signal is output continuously for 18ms (typ) or

more, IC determines that there is over-current and stops the output. To reset from the stop state, set the EN pin to “L”,

then set the EN pin to “H” again.

Equivalent circuit of the over-current detection circuit

Selecting the Frequency

According to the logic of S0 and S1, the charge pump operation frequency can be changed.

In the case of light load, the reactive power can be reduced by decreasing the operating frequency.

S0

S1

CP operating frequency

L

L

1MHz

H

L

500kHz

L

H

250kHz

H

H

125kHz

RO

CPO

FB

R1

R2

VREF = 1.3V

+

VREF

-

FB

RO

CPO

Output voltage

detection comparator

Short-circuit

detection signal

Output current

detection comparator

+

0.875

× VREF

-