UNISONIC TECHNOLOGIES CO., LTD

L3383

CMOS IC

www.unisonic.com.tw

1 of 14

Copyright © 2005 Unisonic Technologies Co., Ltd.

QW-R502-032,E

PFM CONTROLLED, STEP-UP

DC/DC CONVERTERS

(VARIABLE DUTY RATIO)

DESCRIPTION

The UTC L3383 Series are PFM step-up DC/DC switching

converter. The UTC L3383 can support both large and small

currents. It automatically switches duty ratio (45%/75%) when it

senses changes in load.

Both built-in and external transistor types include 5-pin and 3-pin

packages, which are provided with either a CE (chip enable) function

pin function (separated power and voltage detect pins).

FEATURES

* Output voltage range: 2.0V~7.0V in 0.1V increments

* Operating (start-up) voltage range: 0.9V~10V

* Highly accurate: Set-up voltage ±2.5%

* Maximum oscillator frequency (Max Fosc1): 180kHz (±15%)

* Variable Duty Ratio: 45%/75% (±5%)

* Both switching transistor built-in and external types are available

1

SOT-89

SOT-25

4

5

3

2

1

*Pb-free plating product number: L3383L

ORDERING INFORMATION

Order Number

Pin Assignment

Normal

Lead Free Plating

Package

12

3

4

5

Packing

L3383-xx-AB3-R

L3383L-xx-AB3-R

SOT-89

G

O

I

-

-

Tape Reel

L3383-xx-AF5-R

L3383L-xx-AF5-R

SOT-25

E

O

N

G

I

Tape Reel

xx: Output Voltage, refer to Marking Information.

L3383L-xx-AB3-R

(1)Packing Type

(2)Package Type

(3)Output Voltage Code

(4)Lead Plating

(1) R: Tape Reel

(2) AB3: SOT-89, AF5: SOT-25

(3) xx: refer to Marking Information

(4) L: Lead Free Plating, Blank: Pb/Sn