MC33468

SEMICONDUCTOR

TECHNICAL DATA

VARIABLE FREQUENCY

MICROPOWER DC–to–DC

CONVERTER

Order this document by MC33468/D

N SUFFIX

PLASTIC PACKAGE

CASE 1212

(SOT–23–5)

15

4

2

3

(Top View)

Ground

Vdd

EXT

VOUT

N/C

PIN CONNECTIONS

5

1

1

MOTOROLA ANALOG IC DEVICE DATA

Variable Frequency

Micropower Step-up DC-DC

Converter

The MC33468 is a micropower step–up switching voltage regulator,

specifically designed for handheld and pager applications, to provide a

regulated output voltage using a minimum of external parts. This device

features a quiescent bias current of 3.0

µA typical.

The MC33468 features a highly accurate voltage reference, an error

amplifier, an oscillator, a variable frequency modulation (VFM) controller, a

drive pin (EXT) for an external transistor, and feedback resistors.

The Vout pin is fixed at 2V in the IC. The output of the converter with an

inductor, a diode, a capacitor, a drive transistor, and feed–back resistors can

have an output of 30V.

MC33468 Features:

ORDERING INFORMATION

Device

Output

Voltage

Marking

Reel

Size

Tape

Width

Quantity

MC33468SN–20ATR

2.0

0KXX*

7”

8 mm

3000

* “XX” denotes the lot number.

PIN DESCRIPTION

Pin No.

Symbol

Description

1

GND

Ground

2

VDD

Input

3

EXT

External Transistor Drive

4

NC

No Connection

5

VOUT

Voltage Output Pin (Fixed at 2V)

Representative Block Diagram

Vref

Gnd

Oscillator

5

VOUT

1

Drive

VDD

2

EXT

3