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MC33468

Variable Frequency Micropower Step-up DC-DC Converter

ON Semiconductor 

ON Semiconductort

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:

• Low Quiescent Bias Current of 3.0 µA

• High Output Voltage Accuracy of ±2.5%

• Low Startup Voltage of 0.8 V at No Load

• Output Voltage Set With External Resistors

• Operating Temperature Range: –40°C to +85°C

• Surface Mount Package

ORDERING INFORMATION

Device

Output

Reel

Voltage Marking Size

Tape

Width Quantity

MC33468SN–20ATR

2.0

* “XX” denotes the lot number.

0KXX*

7”

8 mm

3000

PIN DESCRIPTION

Pin No.

1

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 4

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 5

Symbol

Description

GND

Ground

VDD

Input

EXT

External Transistor Drive

NC

No Connection

VOUT

Voltage Output Pin (Fixed at 2V)

Representative Block Diagram

2

VDD

3

Drive

EXT

5

VOUT

Oscillator

MC33468

VARIABLE FREQUENCY

MICROPOWER DC–to–DC

CONVERTER

SEMICONDUCTOR

TECHNICAL DATA

5

1

N SUFFIX

PLASTIC PACKAGE

CASE 1212

(SOT–23–5)

PIN CONNECTIONS

Ground 1

Vdd 2

EXT 3

5 VOUT

4 N/C

(Top View)

Vref

© Semiconductor Components Industries, LLC, 2001

March, 2001 – Rev. 2

1 Gnd

1

Publication Order Number:

MC33468/D

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