P1686

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 6

www.unisonic.com.tw

QW-R103-039.C

PIN CONFIGURATION

SOP-8

HSOP-8

5

6

7

8

4

3

2

1

EN

FB

COMP

SYNC

GND

SW

IN

BST

5

6

7

8

4

3

2

1

EN

FB

COMP

SYNC

GND

SW

IN

BST

PIN DESCRIPTION

PIN NO.

PIN NAME

PIN FUNCTION

1

BST

Providing power to the internal NPN switch. To turn on for this switch the lowest voltage is

2.7V.

2

IN

This PIN delivers all control and power circuitry’s power, and sees high di/dt during

switching. A decoupling capacitor is better to be attached to this pin very closely.

3

SW

This PIN is the emitter of the internal switch and should be connected with the external

freewheeling diode very closely.

4

GND

Almost all voltages are measured with respect to this pin. The decoupling capacitor and the

freewheeling diode is better to be connected to this PIN as short as possible.

5

FB

Input of feedback for adjustable output controllers.

6

COMP

Output of the internal error amplifier and also input of the peak current comparator. To

achieve the specified performance a compensation network is connected to this pin.

7

EN

Chip enable input. EN is high: the regulator switched on; EN is low: off. EN is low: the

regulator is in standby mode, and the input supply current is reduced to a few

microamperes.

8

SYNC

Synchronous control pin used to synchronize the internal oscillator to an external pulse

control signal. But it should be connected to GND when not used.