MOTOROLA MC33468SN-20ATR Datasheet

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Order this document by MC33468/D

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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

Output

Device

MC33468SN–20ATR 2.0 0KXX* 7” 8 mm 3000

* “XX” denotes the lot number.

Voltage

Marking

PIN DESCRIPTION

Pin No. Symbol Description

1 2 3 4 5

GND V

EXT

NC

V

OUT

DD

Ground Input External Transistor Drive No Connection Voltage Output Pin (Fixed at 2V)

Reel Size

Tape

Width

Quantity

VARIABLE FREQUENCY

MICROPOWER DC–to–DC

CONVERTER

SEMICONDUCTOR

TECHNICAL DATA

5

1

N SUFFIX

PLASTIC PACKAGE

CASE 1212

(SOT–23–5)

PIN CONNECTIONS

15

Ground

Vdd

EXT

2 3

(Top View)

V

OUT

N/C

4

Representative Block Diagram

2

V

DD

3

EXT

Drive

Oscillator

MOTOROLA ANALOG IC DEVICE DATA

5

V

OUT

V

ref

Gnd

1

MC33468

Á

MAXIMUM RATINGS

Power Supply Voltage (Transient) Power Supply Voltage (Operating) External Pin Voltage EXT Pin Source/Sink Current

(TC = 25°C, unless otherwise noted.)

Rating

Symbol Value Unit

V V

V

I

DD DD

EXT

Power Dissipation and Thermal Characteristics

N Suffix, Plastic Package Case 1212 (SOT–23–5)

Maximum Power Dissipation @ T Thermal Resistance, Junction–to–Air R

Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range

ELECTRICAL CHARACTERISTICS (V

= 250°C P

A

= 1.9 V, TA = 25°C, unless otherwise noted.)

DD

T

θJA T

T

stg

Characteristic

OSCILLAT OR

Frequency Oscillator Minimum Supply Voltage (IO = 0 mA) Oscillator Duty Cycle

EXT OUTPUT

ON State Source Current (V OFF State Sink Current (V

EXT

= GND)

= 1.9 V)

TOTAL DEVICE

Output Voltage Quiescent Bias Current (V Quiescent Bias Current (V Internal Resistor (V

OUT

= 1.9 V, IO = 0 mA)

OUT

= 2.1 V, IO = 0 mA)

OUT

to GND)

Output Voltage Temperature Coefficient

I

= 10 mA, –40°C ≤ TA ≤ 85°C

OUT

БББББББББББББББ

1. Indicates test circuits shown on next page.

12 10

–0.3 to VDD + 0.3

50/50

D

150 mW

V V V

mA

667 °C/W

J

A

125

–40 to +85

–55 to +125

°C °C °C

Symbol Min Typ Max Unit Note

f

osc

V

DD D

I

source

I

sink

V

OUT

I

Q

I

Q

R

Vout

D

V

OUT

D

T

ÁÁÁ

A

– –

65

1.5

1.950 – –

2.0 –

ÁÁ

180

0.7 75

– –

2.000 15

3.0 –

±50

ÁÁ

–

0.8 –

– –

2.050 25

5.0 – –

ÁÁ

kHz

M

ppm/oc

ÁÁ

V

%

mA mA

V

µA µA

1

B B B

C D

A A

W

E

Á

Figure 1. Output Voltage versus Output Current

40

35

30

, OUTPUT VOL TAGE (V)

OUT

25

V

0

I

, OUTPUT CURRENT (mA)

OUT

2

Vin = 3.6 V

Figure 2. Efficiency versus Output Current

80

70

60

50

EFFICIENCY

40

30

2020

0

 Motorola, Inc. 1999 Rev 1, 09/1999

Vin = 3.6 V

2020 4040 6060

I

, OUTPUT CURRENT (mA)

OUT

MOTOROLA ANALOG IC DEVICE DATA

MC33468

A

C

V

DD

GND

V

OUT

A A

EXT

V

DD

EXT

B

Oscilloscope

D

V

DD

EXT

V

DD

EXT

GND

V

OUT

V

OUT

E

V

DD

EXT

GND

V

OUT

A

Figure 3. T est Circuit Schematics

MOTOROLA ANALOG IC DEVICE DATA

3