Motorola MC34166TV, MC34166D2TR4, MC34166T, MC34166TH, MC33166D2T Datasheet

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The MC34166, MC33166 series are high performance fixed frequency power switching regulators that contain the primary functions required for dc–to–dc converters. This series was specifically designed to be incorporated in step–down and voltage–inverting configurations with a minimum number of external components and can also be used cost effectively in step–up applications.

These devices consist of an internal temperature compensated reference, fixed frequency oscillator with on–chip timing components, latching pulse width modulator for single pulse metering, high gain error amplifier, and a high current output switch.

Protective features consist of cycle–by–cycle current limiting, undervoltage lockout, and thermal shutdown. Also included is a low power standby mode that reduces power supply current to 36 µA.

• Output Switch Current in Excess of 3.0 A

• Fixed Frequency Oscillator (72 kHz) with On–Chip Timing

• Provides 5.05 V Output without External Resistor Divider

• Precision 2% Reference

• 0% to 95% Output Duty Cycle

• Cycle–by–Cycle Current Limiting

• Undervoltage Lockout with Hysteresis

• Internal Thermal Shutdown

• Operation from 7.5 V to 40 V

• Standby Mode Reduces Power Supply Current to 36 µA

• Economical 5–Lead TO–220 Package with Two Optional Leadforms

• Also Available in Surface Mount D

2

PAK Package

Order this document by MC34166/D

 

POWER SWITCHING

REGULATORS

SEMICONDUCTOR

TECHNICAL DATA

TH SUFFIX

PLASTIC PACKAGE

CASE 314A

1

5

Heatsink surface connected to Pin 3.

T SUFFIX

PLASTIC PACKAGE

CASE 314D

1

5

1

5

TV SUFFIX

PLASTIC PACKAGE

CASE 314B

3

Oscillator

PWM

Simplified Block Diagram

(Step Down Application)

I

LIMIT

S

Q

R

UVLO

Thermal

Reference

EA

5

This device contains 143 active transistors.

Pin 1. V oltage Feedback Input

2. Switch Output

3. Ground

4. Input V oltage/V

5. Compensation/Standby

V

in

4

1

5

Heatsink surface (shown as terminal 6

2

in case outline drawing) is connected to Pin 3.

CC

D2T SUFFIX

PLASTIC PACKAGE

CASE 936A

(D2PAK)

ORDERING INFORMATION

L

1

V

O

5.05 V/3.0 A

Device

MC33166D2T MC33166T MC33166TH MC33166TV MC34166D2T MC34166T MC34166TH MC34166TV

Operating

Temperature Range

TA = – 40° to + 85°C

TA = 0° to + 70°C

Package

Surface Mount Straight Lead Horiz. Mount Vertical Mount Surface Mount Straight Lead Horiz. Mount Vertical Mount

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 4

1

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Input Voltage V Switch Output Voltage Range V Voltage Feedback and Compensation Input

Voltage Range

Power Dissipation

Case 314A, 314B and 314D (TA = +25°C) P

Thermal Resistance, Junction–to–Ambient θ Thermal Resistance, Junction–to–Case θ

Case 936A (D2PAK) (TA = +25°C) P

Thermal Resistance, Junction–to–Ambient θ

Thermal Resistance, Junction–to–Case θ Operating Junction Temperature T Operating Ambient Temperature (Note 3)

MC34166 MC33166

Storage Temperature Range T

V

FB, VComp

MC34166 MC33166

CC

O(switch)

D JA JC

J

T

A

stg

40 V

–1.5 to + V

in

–1.0 to + 7.0 V

Internally Limited W

65 °C/W

5.0 °C/W

Internally Limited W

70 °C/W

5.0 °C/W

+150 °C

0 to + 70

– 40 to + 85

– 65 to +150 °C

V

°C

ELECTRICAL CHARACTERISTICS (V

= 12 V, for typical values TA = +25°C, for min/max values TA is the operating ambient

CC

temperature range that applies [Notes 2, 3], unless otherwise noted.)

Characteristic

Symbol Min Typ Max Unit

OSCILLAT OR

Frequency (VCC = 7.5 V to 40 V) TA = +25°C

TA = T

low

to T

high

f

OSC

65 62

72

–

81

79

ERROR AMPLIFIER

Voltage Feedback Input Threshold TA = +25°C

TA = T

low

to T

high

Line Regulation (VCC = 7.5 V to 40 V, TA = +25°C) Reg Input Bias Current (VFB = V

+ 0.15 V) I

FB(th)

V

FB(th)

IB

line

4.95

4.85

5.05 –

5.15

5.2 – 0.03 0.078 %/V – 0.15 1.0 µA

Power Supply Rejection Ratio (VCC = 10 V to 20 V, f = 120 Hz) PSRR 60 80 – dB Output Voltage Swing

High State (I Low State (I

= 75 µA, VFB = 4.5 V)

Source

= 0.4 mA, VFB = 5.5 V)

Sink

V

OH

V

OL

4.2 –

4.9

1.6

–

1.9

PWM COMPARATOR

Duty Cycle

Maximum (VFB = 0 V) Minimum (V

Comp

= 1.9 V)

DC

(max)

(min)

92

0

95

100

0

SWITCH OUTPUT

Output Voltage Source Saturation (VCC = 7.5 V, I

Off–State Leakage (VCC = 40 V, Pin 2 = Gnd) I Current Limit Threshold I

= 3.0 A) V

Source

sat

sw(off)

pk(switch)

– (V

CC

–1.5)

(V

CC

–1.8)

– 0 100 µA

3.3 4.3 6.0 A

Switching Times (VCC = 40 V, Ipk = 3.0 A, L = 375 µH, TA = +25°C)

Output Voltage Rise T ime Output Voltage Fall T ime

t

r

t

f

– –

100

50

200 100

UNDERVOLTAGE LOCKOUT

Startup Threshold (VCC Increasing, TA = +25°C) V Hysteresis (VCC Decreasing, TA = +25°C) V

th(UVLO) H(UVLO)

5.5 5.9 6.3 V

0.6 0.9 1.2 V

TOTAL DEVICE

Power Supply Current (TA = +25°C )

Standby (VCC = 12 V, V Operating (VCC = 40 V, Pin 1 = Gnd for maximum duty cycle)

NOTES: 1. Maximum package power dissipation limits must be observed to prevent thermal shutdown activation.

2.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

3.T

=0°C for MC34166 T

low

=–40°C for MC33166 = + 85°C for MC33166

Comp

< 0.15 V)

high

= + 70°C for MC34166

I

CC

– –

36 31

100

55

kHz

V

%

V

ns

µA

mA

2

MOTOROLA ANALOG IC DEVICE DATA

MC34166 MC33166

Figure 1. V oltage Feedback Input Threshold

versus T emperature

5.25 VCC = 12 V

5.17

5.09

5.01

4.93

, VOLTAGE FEEDBACK INPUT THRESHOLD (V)

4.85

– 55 – 25 0 25 50 75 100 125

FB(th)

V

TA, AMBIENT TEMPERATURE (°C)

V

FB(th)

V

FB(th)

V

FB(th)

Max = 5.15 V

Typ = 5.05 V

Min = 4.95 V

Figure 3. Error Amp Open Loop Gain and

Phase versus Frequency

100

80

60

40

20

, OPEN LOOP VOL TAGE GAIN (dB)

0

VOL

A

–20

Gain

100 1.0 k 10 k 100 k 1.0 M

f, FREQUENCY (Hz)

VCC = 12 V

V

= 3.25 V

Comp

RL = 100 k TA = +25

°

C

Phase

100

80

60

40

, INPUT BIAS CURRENT (nA)

20

IB

I

0

– 55 – 25 0 25 50 75 100 125

0

30

60

90

120

150

180

10 M10

2.0

1.6

1.2

0.8

0.4

, EXCESS PHASE (DEGREES)

φ

, OUTPUT SA TURATION VOLTAGE (V)

sat

V

0

Figure 2. V oltage Feedback Input Bias

Current versus Temperature

VCC = 12 V VFB = V

FB(th)

TA, AMBIENT TEMPERATURE (°C)

Figure 4. Error Amp Output Saturation

versus Sink Current

VCC = 12 V VFB = 5.5 V

°

C

TA = +25

0.4 0.8 1.2 1.6 I

, OUTPUT SINK CURRENT (mA)

Sink

2.00

Figure 5. Oscillator Frequency Change

versus T emperature

4.0

0

– 4.0

– 8.0

, OSCILLAT OR FREQUENCY CHANGE (%)

OSC

–12

f

–55

∆

– 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (

MOTOROLA ANALOG IC DEVICE DATA

VCC = 12 V

°

C)

100

80

60

40

20

DC, SWITCH OUTPUT DUTY CYCLE (%)

0

1.5

Figure 6. Switch Output Duty Cycle

versus Compensation V oltage

VCC = 12 V

°

C

TA = +25

2.0 2.5 3.0 3.5 4.0 V

, COMPENSATION VOLTAGE (V)

Comp

4.5

3

MC34166 MC33166

Figure 7. Switch Output Source Saturation

versus Source Current

0

V

– 0.5

–1.0

–1.5

– 2.0

– 2.5

, SWITCH OUTPUT SOURCE SA TURATION (V)

– 3.0

sat

0 2.0 3.0 4.0 5.0

V

1.0

I

, SWITCH OUTPUT SOURCE CURRENT (A)

Source

CC

TA = +25°C

Figure 9. Switch Output Current Limit

Threshold versus T emperature

4.7 VCC = 12 V

Pins 1, 2, 3 = Gnd

4.5

Figure 8. Negative Switch Output Voltage

versus T emperature

0

VCC = 12 V

– 0.2

Pin 5 = 2.0 V Pins 1, 3 = Gnd

– 0.4

Pin 2 Driven Negative

– 0.6

– 0.8

–1.0

, SWITCH OUTPUT VOL TAGE (V)

sw

V

–1.2

– 55 – 25 0 25 50 75 100 125

Isw = 10 mA

TA, AMBIENT TEMPERATURE (°C)

Gnd

Isw = 100 µA

Figure 10. Standby Supply Current

versus Supply V oltage

160

Pin 4 = V

CC

Pins 1, 3, 5 = Gnd

A)

µ

120

Pin 2 Open

°

C

TA = +25

4.3

4.1

, CURRENT LIMIT THRESHOLD (A)

pk(switch)

3.9

I

– 55 – 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

Figure 11. Undervoltage Lockout

Threshold versus T emperature

6.5

6.0

5.5

5.0

4.5

, UNDERVOL TAGE LOCKOUT THRESHOLD (V)

4.0

–55

th(UVLO)

V

– 25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (

Startup Threshold

VCC Increasing

Turn–Off Threshold

VCC Decreasing

°

C)

, SUPPLY CURRENT (

CC

I

, SUPPLY CURRENT (mA)

CC

I

40

30

20

10

80

40

0

10 20 30 40

VCC, SUPPLY VOLTAGE (V)

Figure 12. Operating Supply Current

versus Supply V oltage

0

10 20 30

VCC, SUPPLY VOLTAGE (V)

Pin 4 = V

CC

Pins 1, 3 = Gnd Pins 2, 5 Open

°

C

TA = +25

40

4

MOTOROLA ANALOG IC DEVICE DATA

MC34166 MC33166

Figure 13. MC34166 Representative Block Diagram

V

in

+

C

T

Oscillator

Pulse Width

Modulator

PWM Latch

Current

Sense

S

Q

R

Undervoltage

Lockout

4

Switch Output

2

Input Voltage/V

C

in

CC

Timing Capacitor C

4.1 V T

Compensation

2.3 V

Thermal

Shutdown

µ

A

100

Gnd Compensation

3

Sink Only

=

Positive True Logic

Figure 14. Timing Diagram

+

120

5

5.05 V

Reference

Error

Amp

C

F

R

F

Voltage

+

Feedback Input

L

V

1

R

2

R

1

O

C

O

ON

Switch Output

OFF

MOTOROLA ANALOG IC DEVICE DATA

5