LD1985

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

2 of 9

www.unisonic.com.tw

QW-R102-021.J



MARKING INFORMATION

PACKAGE

VOLTAGE CODE

MARKING

SOT-25

1 5 : 1 . 5 V

1 8 : 1 . 8 V

2 5 : 2 . 5 V

2 8 : 2 . 8 V

2 J : 2 . 8 5 V

3 0 : 3 . 0 V

3 1 : 3 . 1 V

3 2 : 3 . 2 V

3 3 : 3 . 3 V

3 5 : 3 . 5 V

3 6 : 3 . 6 V

3 8 : 3 . 8 V

4 0 : 4 . 0 V

4 7 : 4 . 7 V

5 0 : 5 . 0 V

3

2

1

LDXX

5

4

Voltage Code

L: Lead Free

G: Halogen Free



PIN CONFIGURATION

3

2

1

4

5

INH

GND

VIN

VOUT

Byp



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

VIN

Input port

2

GND

Ground Pin

3

INHIBIT

Control switches ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating.

Disable the device when connected to GND or to a positive voltage less than 0.18V

4

Bypass

Bypass pin: capacitor to be connected to GND in order to improve the thermal noise

performances.

5

VOUT

Output port



BLOCK DIAGRAM

VOUT

DRIVER

ERROR

AMPLIFIER

CURRENT

LIMIT

REFERENCE

VOLTAGE

START-UP

SHUTDOWN

TERM. PROTEC.

GND

BYPASS

INHIBIT

VIN