LV5256GP

No.A1277-7/9

Continued from preceding page.

Pin No.

Pin Name

Description

Equivalent Circuit

13

SS

Capacitor connection pin for soft start. The capacitor

connected to this pin is charged by the internal 10

µA

constant current. The interval during which this voltage

reaches Vref is called the soft start period. The voltage is

clipped to approx. 2V after the soft start. This pin is pulled

down to the ground level when ONOFF/UVLO lock mode.

13

VIN

500

Ω

REG_O

10k

Ω

10

µA

1.25V

REG_O

14

TRAC_IN

Reference voltage input pin for tracking power supply

operating. A voltage from 0V up to Vref applied to this pin

serves as the reference voltage for determining the output

voltage. This pin must be connected to the SS pin when it

is not to be used.

14

VIN

1k

Ω

REG_O

REG_O

15

FB

Error amplifier output pin. Connect a phase compensation

component between this pin and IN pin.

15

VIN

1k

Ω

1.25V

REG_O

400

Ω

100

µA

16

IN

Output voltage input pin. Apply the resistor divided output

voltage to this pin.

REG_O

16

VIN

1k

Ω

SS

TRAC_IN Vref

REG_O

17

OCP_SEL

OCP detection voltage switching pin, A 100k

Ω pull-down

resistor is provided between OCP_SEL and GND. The IC

enters the 0.8 times detection mode when this pin is

connected to GND or kept open and enters the 0.4 times

detection mode when the pin is connected to the REG_O

pin.

17

VDD

100k

Ω

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