Motorola MC3425P1 Datasheet

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The MC3425 is a power supply supervisory circuit containing all the
necessary functions required to monitor over and undervoltage fault
conditions. These integrated circuits contain dedicated over and
undervoltage sensing channels with independently programmable time
delays. The overvoltage channel has a high current Drive Output for use in
conjunction with an external SCR Crowbar for shutdown. The undervoltage
channel input comparator has hysteresis which is externally programmable,
and an open–collector output for fault indication.

• Dedicated Over and Undervoltage Sensing

• Programmable Hysteresis of Undervoltage Comparator

• Internal 2.5 V Reference

• 300 mA Overvoltage Drive Output

• 30 mA Undervoltage Indicator Output

• Programmable Time Delays

• 4.5 V to 40 V Operation

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V
Comparator Input Voltage Range (Note 1) V
Drive Output Short Circuit Current I

Indicator Output Voltage V
Indicator Output Sink Current I
Power Dissipation and Thermal Characteristics

Maximum Power Dissipation @ TA = 70°C

Thermal Resistance, Junction–to–Air
Operating Junction Temperature T
Operating Ambient Temperature Range T
Storage Temperature Range T

NOTE: 1. The input signal voltage should not be allowed to go negative by more than 300 mV

NOTE: 1. or positive by more than 40 V, independent of VCC, without device destruction.

CC

IR

OS(DRV)

IND

IND

P

D

R

θJA

J
A

stg

40 Vdc

–0.3 to +40 Vdc

Internally

Limited

0 to 40 Vdc

30 mA

1000

80

+150 °C

0 to +70 °C

–55 to +150 °C

mA

mW

°C/W

Order this document by MC3425/D



POWER SUPPLY SUPERVISORY/

OVER AND UNDERVOLTAGE

PROTECTION CIRCUIT

SEMICONDUCTOR

TECHNICAL DATA

8

1

P1 SUFFIX

PLASTIC PACKAGE

CASE 626

PIN CONNECTIONS

O.V. DRV

O.V. DLY

O.V. Sense

Output

1

2

3

8

V

CC

7

Gnd
U.V. IND

6

Output

Simplified Application

Overvoltage Crowbar Protection, Undervoltage Indication

V

in

DC

Power

Supply

+

C

out

MOTOROLA ANALOG IC DEVICE DATA

MC3425

V

out

Undervoltage
Indication

U.V. Sense

45

(Top View)

U.V. DLY

ORDERING INFORMATION

Operating

Device

MC3425P1 TA = 0° to +70°C Plastic DIP

 Motorola, Inc. 1996 Rev 2

Temperature Range

Package

1

MC3425

ELECTRICAL CHARACTERISTICS

(4.5 V ≤ VCC ≤ 40 V; TA = T

Characteristics Symbol Min Typ Max Unit

REFERENCE SECTION

Sense Trip Voltage (Referenced Voltage)

VCC = 15 V

TA= 25°C
T

to T

low

Line Regulation of V

4.5 V ≤ VCC ≤ 40 V; TJ = 25°C

high

(Note 2)

Sense

Power Supply Voltage Operating Range V
Power Supply Current

VCC = 40 V; TA = 25°C; No Output Loads

O.V. Sense (Pin 3) = 0 V;
U.V. Sense (Pin 4) = V

CC

O.V. Sense (Pin 3) = VCC;

U.V. Sense (Pin 4) = 0 V

INPUT SECTION

Input Bias Current, O.V . and U.V. Sense I
Hysteresis Activation Voltage, U.V. Sense

VCC = 15 V; TA = 25°C;

IH = 10%
IH = 90%

Hysteresis Current, U.V. Sense

VCC = 15 V; TA = 25°C; U.V. Sense (Pin 4) = 2.5 V
Delay Pin Voltage (I

Low State

DLY

= 0 mA)

High State
Delay Pin Source Current

VCC = 15 V; V

DLY

= 0 V

Delay Pin Sink Current

VCC = 15 V; V

DLY

= 2.5V

OUTPUT SECTION

Drive Output Peak Current (TA = 25°C) I
Drive Output Voltage

I

= 100 mA; TA = 25° C

DRV

Drive Output Leakage Current

V

= 0 V

DRV

Drive Output Current Slew Rate (TA = 25°C) di/dt – 2.0 – A/µs
Drive Output VCC Transient Rejection

VCC = 0 V to 15 V at dV/dt = 200 V µs;

O.V. Sense (Pin 3) = 0 V; TA = 25°C
Indicator Output Saturation Voltage

I

= 30 mA; TA = 25°C

IND

Indicator Output Leakage Current

V

OH(IND)

= 40 V
Output Comparator Threshold Voltage (Note 3) V
Propagation Delay Time

(VCC = 15 V; TA = 25°C)
Input to Drive Output or Indicator Output

100 mV Overdrive, C

DLY

= 0 µF

Input to Delay

2.5 V Overdrive (0 V to 5.0 V Step)

NOTES: 2. T

low

3.The V

to T

= 0° to +70°C

high

limits are approximately the V

th(OC)

limits over the applicable temperature range.

Sense

to T

low

V

Reg

I

CC(off)

I

CC(on)

V

V

OL(DLY)

V

OH(DLY)

I

DLY(source)

I

DLY(sink)

DRV(peak)

V

OH(DRV)

I

DRV(leak)

I

DRV(trans)

V

IND(sat)

I

IND(leak)

t

PLH(IN/OUT)

t

PLH(IN//DLY)

[Note 2], unless otherwise noted.)

high

Sense

2.4

2.33

line

CC

– 7.0 15 mV

4.5 – 40 Vdc

– 8.5 10 mA

– 16.5 19 mA

IB

– 1.0 2.0 µA

H(act)

–
–

I

H

9.0 12.5 16 µA

–

VCC–0.5

VCC–0.15

140 200 260 µA

1.8 3.0 – mA

200 300 – mA

VCC–2.5 VCC–2.0 – V

– 15 200 nA

– 1.0 – mA

– 560 800 mV

– 25 200 nA

th(OC)

2.33 2.5 2.63 V

– 1.7 – µs

– 700 – ns

2.5

2.5

0.6

0.8

0.2

2.6

2.63

–
–

0.5
–

(Peak)

Vdc

V

V

2

MOTOROLA ANALOG IC DEVICE DATA

MC3425

Figure 1. Hysteresis Current versus

Hysteresis Activation V oltage

14
12

µ

, HYSTERESIS CURRENT ( A)

H

I

TA = 25°C

10

8.0

6.0

4.0

2.0
0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

VCC = 40 V

V

CC

=15V

V

, HYSTERESIS ACTIVATION VOLTAGE (V)

H(act)

VCC = 5.0 V

Figure 3. Hysteresis Current

versus T emperature

15.0

µ

14.0

U.V. Sense = 2.5 V

Figure 2. Hysteresis Activation V oltage

versus T emperature

1.2
V

= Voltage Level at

H(act)

VCC = 5.0 V

1.0

0.8

VCC = 15 V

0.6

0.4

0.2

, HYSTERESIS ACTIVATION VOLTAGE (V)

H(act)

V

VCC = 40 V

0

–55 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (

which Hysteresis Current
(IH) is 90% of full value.

°

C)

Figure 4. Sense Trip Voltage Change

versus T emperature

V

* = 2.400 V * = 2.500 V * = 2.600 V

Sense

0

–10

13.0

12.0

11.0

, HYSTERESIS CURRENT ( A)

H

I

10.0
–55 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (

°

C)

Figure 5. Output Delay Time versus

Delay Capacitance

, OUTPUT DELAY TIME (mS)t

DLY

100

10

1.0

0.1

0.01

VCC = 15 V

°

C

TA = 25

t

DLY

=

2.5 C
200 µA

DLY

–20

–30

–40

, SENSE TRIP VOLTAGE CHANGE (mW)

–50

Sense

V

–55 –25 0 25 50 75 100 125

∆

VCC = 15 V
*V

at TA = 25

Sense

TA, AMBIENT TEMPERATURE (°C)

°

C

Figure 6. Delay Pin Source Current

µ

260

240

220

200

, DELAY PIN SOURCE CURRENT ( A)

180

versus T emperature

VCC = 40 V

VCC = 15 V

VCC = 5.0 V

0.001

0.0001 0.001 0.01 0.1 1.0 10
C

, DELAY PIN CAPACITANCE (µF)

DLY

MOTOROLA ANALOG IC DEVICE DATA

160

DLY(source)

I

–55 –25 0 25 50 75 100 125

°

TA, AMBIENT TEMPERATURE (

C)

3

MC3425

Figure 7. Drive Output Saturation Voltage

versus Output Peak Current

5.0

VCC = 15 V

4.0

1.0% Duty Cycle @ 300 Hz

°

C

TA = 25

3.0

2.0

1.0

, DRIVE OUTPUT SATURATION VOLTAGE (V)

0

0 100 200 300 400

OH(DRV)

V

I

DRV(peak)

, DRIVE OUTPUT PEAK CURRENT (mA)

Figure 9. Drive Output Saturation Voltage

versus T emperature

2.500
VCC = 15 V

2.460

2.420

I

DRV(peak)

1.0% Duty Cycle @ 300 Hz

= 200 mA

Figure 8. Indicator Output Saturation Voltage

versus Output Sink Current

0.4

0.3

0.2
VCC = 15 V

°

C

TA = 25

0.1

0

, INDICAT OR OUTPUT SATURATION VOL TAGE (V)

010203040

I

, INDICAT OR OUTPUT SINK CURRENT (mA)

IND(sat)

V

IND

Figure 10. Power Supply Current

versus V oltage

28

Curve O.V. Sense U.V. Sense

AVCCGnd

24

B Gnd V

20
16

CC

A

2.380

2.340

, DRIVE OUTPUT SATURATION VOTLAGE (V)

2.300
–55 –25 0 25 50 75 100 125

OH(DRV)

V

TA, AMBIENT TEMPERATURE (

°

C)

12

8.0

, POWER SUPPLY CURRENT (mA)

4.0

CC

I

0

0 5.0 10 15 20 25 30 35 40

VCC, POWER SUPPLY VOLTAGE (V)

B

TA = 25°C

4

MOTOROLA ANALOG IC DEVICE DATA