MC34129EF Datasheet MC34129EF, MC34129D, MC34129DR2 | P1-P3

SEMICONDUCTOR

TECHNICAL DATA

HIGH PERFORMANCE

CURRENT MODE

CONTROLLERS

PIN CONNECTIONS

Order this document by MC34129/D

D SUFFIX

PLASTIC PACKAGE

CASE 751A

(SO–14)

P SUFFIX

PLASTIC PACKAGE

CASE 646

14

1

14

1

(Top View)

Drive Output

Drive Ground

Ramp Input

Sync/Inhibit

Input

R

T

/C

T

V

ref

2.5 V

Gnd

1

2

3

4

5

6

78

9

10

11

12

13

14 V

CC

Start/Run Output

C

Soft–Start

Feedback/

PWM Input

Error Amp

Inverting Input

Error Amp

Noninverting Input

V

ref

1.25 V

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC34129D

MC34129P

T

A

= 0° to +70°C

SO–14

Plastic DIP

MC33129D

MC33129P

SO–14

Plastic DIP

T

A

= –40° to +85°C

1

MOTOROLA ANALOG IC DEVICE DATA

The MC34129/MC33129 are high performance current mode switching

regulators specifically designed for use in low power digital telephone

applications. These integrated circuits feature a unique internal fault timer

that provides automatic restart for overload recovery. For enhanced system

efficiency, a start/run comparator is included to implement bootstrapped

operation of V

CC

. Other functions contained are a temperature compensated

reference, reference amplifier, fully accessible error amplifier, sawtooth

oscillator with sync input, pulse width modulator comparator, and a high

current totem pole driver ideally suited for driving a power MOSFET.

Also included are protective features consisting of soft–start,

undervoltage lockout, cycle–by–cycle current limiting, adjustable deadtime,

and a latch for single pulse metering.

Although these devices are primarily intended for use in digital telephone

systems, they can be used cost effectively in many other applications.

• Current Mode Operation to 300 kHz

• Automatic Feed Forward Compensation

• Latching PWM for Cycle–by–Cycle Current Limiting

• Continuous Retry after Fault Timeout

• Soft–Start with Maximum Peak Switch Current Clamp

• Internally Trimmed 2% Bandgap Reference

• High Current Totem Pole Driver

• Input Undervoltage Lockout

• Low Startup and Operating Current

• Direct Interface with Motorola SENSEFET Products

Simplified Block Diagram

+

–

Soft–Start

and

Fault Timer

Start/Run

Undervoltage

Lockout

1.25V

Reference

Error Amp

Latching

PWM

X2

Oscillator

12

7

6

5

4

C

Soft–Start

Gnd

V

ref

2.5V

R

T

/C

T

Sync/Inhibit

Input

13

14

8

9

10

11

1

2

3

Start/Run

Output

V

CC

V

ref

1.25V

Noninverting

Input

Inverting

Input

Feedback/

PWM Input

Drive Out

Drive Gnd

Ramp Input

 Motorola, Inc. 1996 Rev 1

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cale Semiconductor,

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MC34129 MC33129

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

Rating Symbol Value Unit

V

CC

Zener Current I

Z(VCC)

50 mA

Start/Run Output Zener Current I

Z(Start/Run)

50 mA

Analog Inputs (Pins 3, 5, 9, 10, 11, 12) – –0.3 to 5.5 V

Sync Input Voltage V

sync

–0.3 to V

CC

V

Drive Output Current, Source or Sink I

DRV

1.0 A

Current, Reference Outputs (Pins 6, 8) I

ref

20 mA

Power Dissipation and Thermal Characteristics

D Suffix, Plastic Package Case 751A

Maximum Power Dissipation @ T

A

= 70°C

Thermal Resistance, Junction–to–Air

P Suffix, Plastic Package Case 646

Maximum Power Dissipation @ T

A

= 70°C

Thermal Resistance, Junction–to–Air

P

D

R

θJA

P

D

R

θJA

552

145

800

100

mW

°C/W

mW

°C/W

Operating Junction Temperature T

J

+150 °C

Operating Ambient Temperature

MC34129

MC33129

T

A

0 to +70

–40 to +85

°C

Storage Temperature Range T

stg

–65 to +150 °C

ELECTRICAL CHARACTERISTICS (V

CC

= 10 V, T

A

= 25°C [Note 1], unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

REFERENCE SECTIONS

Reference Output Voltage, T

A

= 25°C

1.25 V Ref., I

L

= 0 mA

2.50 V Ref., I

L

= 1.0 mA

V

ref

1.225

2.375

1.250

2.500

1.275

2.625

V

Reference Output Voltage, T

A

= T

low

to T

high

1.25 V Ref., I

L

= 0 mA

2.50 V Ref., I

L

= 1.0 mA

V

ref

1.200

2.250

–

1.300

2.750

V

Line Regulation (V

CC

= 4.0 V to 12 V)

1.25 V Ref., I

L

= 0 mA

2.50 V Ref., I

L

= 1.0 mA

Reg

line

–

2.0

10

12

50

mV

Load Regulation

1.25 V Ref., I

L

= –10 µA to +500 µA

2.50 V Ref., I

L

= –0.1 mA to +1.0 mA

Reg

load

–

1.0

3.0

12

25

mV

ERROR AMPLIFIER

Input Offset Voltage (V

in

= 1.25 V)

T

A

= 25°C

T

A

= T

low

to T

high

V

IO

–

1.5

–

10

mV

Input Offset Current (V

in

= 1.25 V) I

IO

– 10 – nA

Input Bias Current (V

in

= 1.25 V)

T

A

= 25°C

T

A

= T

low

to T

high

I

IB

–

25

–

200

nA

Input Common Mode Voltage Range V

ICR

– 0.5 to 5.5 – V

Open Loop Voltage Gain (V

O

= 1.25 V) A

VOL

65 87 – dB

Gain Bandwidth Product (V

O

= 1.25 V, f = 100 kHz) GBW 500 750 – kHz

Power Supply Rejection Ratio (V

CC

= 5.0 V to 10 V) PSRR 65 85 – dB

Output Source Current (V

O

= 1.5 V) I

Source

40 80 – µA

Output Voltage Swing

High State (I

Source

= 0 µA)

Low State (I

Sink

= 500 µA)

V

OH

V

OL

1.75

–

1.96

0.1

2.25

0.15

V

NOTE: 1. T

low

=0°C for MC34129 T

high

= +70°C for MC34129

–40°C for MC33129 +85°C for MC33129

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MC34129 MC33129

3

MOTOROLA ANALOG IC DEVICE DATA

ELECTRICAL CHARACTERISTICS (V

CC

= 10 V, T

A

= 25°C [Note 1], unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

PWM COMPARATOR

Input Offset Voltage (V

in

= 1.25 V) V

IO

150 275 400 mV

Input Bias Current I

IB

– –120 –250 µA

Propagation Delay, Ramp Input to Drive Output t

PLH(IN/DRV)

– 250 – ns

SOFT–START

Capacitor Charge Current (Pin 12 = 0 V) I

chg

0.75 1.2 1.50 µA

Buffer Input Offset Voltage (V

in

= 1.25 V) V

IO

– 15 40 mV

Buffer Output Voltage (I

Sink

= 100 µA) V

OL

– 0.15 0.225 V

FAULT TIMER

Restart Delay Time t

DLY

200 400 600 µs

START/RUN COMPARATOR

Threshold Voltage (Pin 12) V

th

– 2.0 – V

Threshold Hysteresis Voltage (Pin 12) V

H

– 350 – mV

Output Voltage (I

Sink

= 500 µA) V

OL

9.0 10 10.3 V

Output Off–State Leakage Current (V

OH

= 15 V) I

S/R(leak)

– 0.4 2.0 µA

Output Zener Voltage (I

Z

= 10 mA) V

Z

– (V

CC

+ 7.6) – V

OSCILLATOR

Frequency (R

T

= 25.5 kΩ, C

T

= 390 pF) f

OSC

80 100 120 kHz

Capacitor C

T

Discharge Current (Pin 5 = 1.2 V) I

dischg

240 350 460 µA

Sync Input Current

High State (V

in

= 2.0 V)

Low State (V

in

= 0.8 V)

I

IH

I

IL

–

40

15

125

35

µA

Sync Input Resistance R

in

12.5 32 50 kΩ

DRIVE OUTPUT

Output Voltage

High State (I

Source

= 200 mA)

Low State (I

Source

= 200 mA)

V

OH

V

OL

8.3

–

8.9

1.4

–

1.8

V

Low State Holding Current I

H

– 225 – µA

Output Voltage Rise Time (C

L

= 500 pF) t

r

– 390 – ns

Output Voltage Fall Time (C

L

= 500 pF) t

f

– 30 – ns

Output Pull–Down Resistance R

PD

100 225 350 kΩ

UNDERVOLTAGE LOCKOUT

Startup Threshold V

th

3.0 3.6 4.2 V

Hysteresis V

H

5.0 10 15 %

TOTAL DEVICE

Power Supply Current

R

T

= 25.5 kΩ, C

T

= 390 pF, C

L

= 500 pF

I

CC

1.0 2.5 4.0 mA

Power Supply Zener Voltage (I

Z

= 10 mA) V

Z

12 14.3 – V

NOTE: 1. T

low

=0°C for MC34129 T

high

= +70°C for MC34129

–40°C for MC33129 +85°C for MC33129

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cale Semiconductor,

I

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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MC34129EF

MC34129EF

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