Motorola MC33466H-30LT1, MC33466H-33JT1, MC33466H-33LT1, MC33466H-50JT1, MC33466H-50LT1 Datasheet

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T

30° t

80°C

     

The MC33466 series are micropower switching voltage regulators, specifically designed for handheld and laptop applications, to provide regulated output voltages using a minimum of external parts. A wide choice of output voltages are available. These devices feature a very low quiescent bias current of 15 µA typical.

The MC33466H–XXJT1 series features a highly accurate voltage reference, an oscillator, a pulse width modulation (PWM) controller, a driver transistor (Lx), an error amplifier and feedback resistive divider.

The MC33466H–XXLT1 is identical to the MC33466H–XXJT1, except that a drive pin (EXT) for an external transistor is provided.

Due to the low bias current specifications, these devices are ideally suited for battery powered computer, consumer , and industrial equipment where an extension of useful battery life is desirable.

MC33466 Series Features:

• Low Quiescent Bias Current of 15 µA

• High Output Voltage Accuracy of ±2.5%

Order this document by MC33466/D



FIXED FREQUENCY PWM

MICROPOWER DC–to–DC

CONVERTER

SEMICONDUCTOR

TECHNICAL DATA

TAB

1

H SUFFIX

PLASTIC PACKAGE

CASE 1213

(SOT–89)

• Low Startup Voltage of 0.9 V at 1.0 mA

• Soft–Start = 500 µs

• Surface Mount Package

ORDERING INFORMATION

Output

Device

MC33466H–30JT1 3.0 MC33466H–33JT1 3.3 MC33466H–50JT1 5.0

MC33466H–30LT1 3.0 MC33466H–33LT1 3.3 MC33466H–50LT1 5.0

Other voltages from 2.5 V to 7.5 V , in 0.1 V increments are available. Consult factory for information.

Voltage

Type

Int.

Switch

Ext.

Switch

Drive

Operating

Temperature Range

°

o +

= –

A

Package

(Tape/Reel)

SOT–89

(Tape)

SOT–89

(Tape)

PIN CONNECTIONS

MC33466H–XXJT1

1

Ground

2

Output

Lx

3

(Top View)

MC33466H–XXLT1

1

Ground

2

Output

EXT

3

(Top View)

Tab

(Tab is connected to Pin 2)

Tab

(Tab is connected to Pin 2)

This document contains information on a new product. Specifications and information herein are subject to change without notice.

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1997 Rev 1

1

MC33466

Representative Block Diagrams

MC33466H–XXJT1

Phase Comp

Soft–Start

D

2

Output (Voltage Feedback)

V

ref

Gnd

1

L

V

in

C

in

3

Lx

VLx Limiter

Drive

PWM

Controller

50 kHz

Oscillator

V

O

C

O

L

V

in

C

in

Rb

Q

3

EXT

Cb

This device contains 100 active transistors.

MAXIMUM RATINGS (T

= 25°C, unless otherwise noted.)

C

Rating Symbol Value Unit

Power Supply Voltage (Transient) Power Supply Voltage (Operating) External Pin Voltage Lx Pin Voltage EXT Pin Source/Sink Current Lx Pin Sink Current Power Dissipation and Thermal Characteristics

H Suffix, Plastic Package Case 1213 (SOT–89)

Maximum Power Dissipation @ T

= 25°C P

A

Thermal Resistance, Junction–to–Air R

Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range

NOTE: ESD data available upon request.

MC33466H–XXLT1

D

Drive

PWM

Controller

50 kHz

Oscillator

Phase Comp

Soft–Start

XX Denotes Output Voltage

V

O

V

O

V

I

EXT

Lx

I

Lx

–0.3 to V

D θJA T

J

T

A

T

stg

–30 to +80

–40 to +125

V

ref

Gnd

1

12

8.0 O

12

50/50

250

mA mA

500 mW 200 °C/W

125

2

Output (Voltage Feedback)

V V V V

°C °C °C

V

O

C

O

2

MOTOROLA ANALOG IC DEVICE DATA

MC33466

ÁÁÁ

ÁÁÁ ÁÁÁ

ÁÁÁ

ELECTRICAL CHARACTERISTICS (V

Characteristic

= 2.0 V, IO = 10 mA and TA = 25°C, unless otherwise noted.)

CC

Symbol Min Typ Max Unit

OSCILLAT OR

Frequency Oscillator Minimum Startup Voltage (IO = 0 mA) Oscillator Minimum Supply Voltage (IO = 0 mA)

V

f

osc start

V

CC

40

0.7

50

–

0.8 –

60

0.9 –

LX OUTPUT (JT1 SUFFIX)

ON State Sink Current (VLx = 0.4 V)

I

Lx

30KT1 Suffix 60 – – 33KT1 Suffix 63 – – 50KT1 Suffix 80 – –

VLx Voltage Limit (Note 1) V OFF State Leakage Current (VLx = 6.0 V)

LxLim I

LKG

0.65 0.8 1.0 V –

–

0.5

EXT OUTPUT (LT1 SUFFIX)

ON State Source Current (V

= VO – 0.4 V)

EXT

I

source

30LT1 Suffix 1.5 – – 33LT1 Suffix 1.575 – – 50LT1 Suffix 2.0 – –

OFF State Sink Current (V

EXT

= 0.4 V)

I

sink

30LT1 Suffix 1.5 – – 33LT1 Suffix 1.575 – – 50LT1 Suffix 2.0 – –

TOTAL DEVICE

Maximum Duty Ratio Each Cycle D 70 80 90 % Output Voltage

V

O

30KT1 or 30LT1 Suf fix 2.925 3.0 3.075 33KT1 or 33LT1 Suf fix 3.218 3.3 3.383 50KT1 or 50LT1 Suf fix 4.875 5.0 5.125

Soft–Start Time (Note 2) T Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)

ss

I

Q

0.5 2.0 – ms

30JT1 Suffix – 15 25 33JT1 Suffix – 17 27 50JT1 Suffix – 30 45

Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)

30JT1 Suffix – 1.2 5.0 33JT1 Suffix – 1.2 5.0 50JT1 Suffix – 2.0 5.0

Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA)

I

Q

30LT1 Suffix – 30 50 33LT1 Suffix – 34.5 56 50LT1 Suffix – 60 90

Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA)

30LT1 Suffix – 1.2 5.0 33LT1 Suffix – 1.2 5.0 50LT1 Suffix – 2.0 5.0

NOTES: 1. When the Lx switch is turned on, ILx current carried through the R

turned off by the Lx switch protection circuit.

2.The soft–start circuit turn–on sequence is as follows: a) Vin is applied. b) The internal IC V c) The internal reference steps up to 0.7 V after 200 µs delay has timed out. d) The error amplifier output voltage integrates down to its steady state value. As the error amplifier output integrates down, the output Lx pin of EXT pin pulse width gradually widens to its steady operating value.

is held at zero for 200 µs. During this time, the error amplifier output voltage ramps up to the positive voltage rail.

ref

of the Lx switch results in VLx. When VLx reaches V

DS(on)

, the Lx switch is

LxLim

kHz

V V

mA

µA

mA

V

µA

MOTOROLA ANALOG IC DEVICE DATA

3

MC33466

Figure 1. Quiescent Current versus T emperature

50

MC33466H–33JT1

µ

IO = 0 mA Vin = 2.0 V

40

30

20

, QUIESCENT BIAS CURRENT ( A)

Q

I

10

–40

–20

0

TA, AMBIENT TEMPERATURE (°C)

20 40

60

Figure 3. Oscillator Frequency versus T emperature

100

MC33466H–50JT1

µ

H

L = 120 IO = 10 mA

80

Vin = 3.0 V

Figure 2. Quiescent Current versus T emperature

2.0 MC33466H–33JT1

µ

IO = 0 mA Vin = 5.5 V

1.6

1.2

0.8

, QUIESCENT BIAS CURRENT ( A)

Q

I

0.4

80 –20

–40

100

MC33466H–50JT1 L = 120 IO = 10 mA

90

Vin = 3.0 V

µ

0

TA, AMBIENT TEMPERATURE (

20

40

°

C)

Figure 4. Maximum Duty Ratio

versus T emperature

H

60

80

, MAXIMUM DUTY RATIO (%)

max

D

80

70

60

–40

–20

0

TA, AMBIENT TEMPERATURE (

20

40

60

°

C)

60

40

, OSCILLAT OR FREQUENCY (kHz)

osc

f

20

–40

–20

0

TA, AMBIENT TEMPERATURE (°C)

20

40

60

80

Figure 5. Lx Switching Current versus Temperature Figure 6. VLx V oltage Limit versus Temperature

200

160

120

80

MC33466H–50JT1

40

, Lx SWITCHING CURRENT (mA)

IO = 10 mA

Lx

I

Vin = 2.0 V

0 –40

–20

0

TA, AMBIENT TEMPERATURE (°C)

20

40

60

80

1.0

0.9

0.8

VOLTAGE LIMIT (V)

0.7

Lx

, V

0.6

MC33466H–50JT1

LxLim

V

IO = 10 mA Vin = 2.0 V

0.5

–40

–20

0

TA, AMBIENT TEMPERATURE (°C)

20

40

60

80

4

MOTOROLA ANALOG IC DEVICE DATA