LP6312-02

May.-2013

www.lowpowersemi.com

Page 9 of 12

Preliminary Datasheet

LP6312

Application Information

Output Voltage Setting

Each of the regulators output voltage can be set via a

resistor divider (ex. R1, R2). The output voltage is

calculated by following equation:







OUT1

R1

V

0.6

0.6 V

R2

LX1

FB1

GND

L1

1.5μH

C10

(Optional)

VOUT1

1.1 V

R1

68KΩ

R2

82KΩ

The following table lists common output voltage and

the corresponding R1, R2 resistance value for

reference.

R1

R2

Tolerance

3.3V

510KΩ

110KΩ

1%

1.8V

200KΩ

100KΩ

1%

1.5V

150KΩ

100KΩ

1%

1.1V

68KΩ

82KΩ

1%

Output Inductor Selection

The output inductor selection mainly depends on the

loss, but the user can use a smaller inductor to save

cost and space.

On the contrary, the larger

output voltage ripple and loss. But it will increase

the space and the cost. The inductor value can be

calculated as:

PWR

OUT

OUT

L

SW

PWR

V

V

V

L

ΔI

F

V







For most applications, 1.0uH to 4.7uH inductors are

suitable for LP6312

Power Dissipation

The total output power dissipation of LP6312 should

not to exceed the maximum 5W range. The total

output power dissipation can be calculated as: