NSC LM9061MX, LM9061M Datasheet

TL/H/12317

LM9061 Power MOSFET Driver with Lossless Protection

April 1995

LM9061
Power MOSFET Driver with Lossless Protection

General Description

The LM9061 is a charge-pump device which provides the
gate drive to any size external power MOSFET configured
as a high side driver or switch. A CMOS logic compatible
ON/OFF input controls the output gate drive voltage. In the
ON state, the charge pump voltage, which is well above the
available V

CC

supply, is directly applied to the gate of the
MOSFET. A built-in 15V zener clamps the maximum gate to
source voltage of the MOSFET. When commanded OFF a
110 mA current sink discharges the gate capacitances of
the MOSFET for a gradual turn-OFF characteristic to mini­mize the duration of inductive load transient voltages and
further protect the power MOSFET.

Lossless protection of the power MOSFET is a key feature
of the LM9061. The voltage drop (V

DS

) across the power
device is continually monitored and compared against an
externally programmable threshold voltage. A small current
sensing resistor in series with the load, which causes a loss
of available energy, is not required for the protection circuit­ry. Should the V

DS

voltage, due to excessive load current,
exceed the threshold voltage, the output is latched OFF in a
more gradual fashion (through a 10 mA output current sink)
after a programmable delay time interval.

Designed for the automotive application environment the
LM9061 has a wide operating temperature range of

b

40§C

to

a

125§C, remains operational with VCCup to 26V, and
can withstand 60V power supply transients. The LM9061 is
available in an 8-pin small outline package, and an 8-pin
dual in-line package.

Features

Y

Built-in charge pump for gate overdrive of high side
drive applications

Y

Lossless protection of the power MOSFET

Y

Programmable MOSFET protection voltage

Y

Programmable delay of protection latch-OFF

Y

Fast turn-ON (1.5 ms max with gate capacitance of
25000 pF)

Y

Undervoltage shut OFF with V

CC

k

7V

Y

Overvoltage shut OFF with V

CC

l

26V

Y

Withstands 60V supply transients

Y

CMOS logic compatible ON/OFF control input

Y

Surface mount and dual in-line packages available

Applications

Y

Valve, relay and solenoid drivers

Y

Lamp drivers

Y

DC motor PWM drivers

Y

Logic controlled power supply distribution switch

Y

Electronic circuit breaker

Typical Application

TL/H/12317– 1

Connection Diagrams

TL/H/12317– 3

Top View

Order Number LM9061M

See NS Package Number M08A

TL/H/12317– 2

Top View

Order Number LM9061N

See NS Package Number N08E

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 60V

Reverse Supply Current 20 mA

Output Voltage V

CC

a

15V

Voltage at Sense and Threshold

(through 1 kX)

b

25V toa60V

ON/OFF Input Voltage

b

0.3V to V

CC

a

0.3V

Junction Temperature 150§C

Storage Temperature

b

55§Cto150§C

Lead Temperature (Soldering, 10 seconds) 260

§

C

Operating Ratings (Note 2)

Supply Voltage 7V to 26V

ON/OFF Input Voltage

b

0.3V to V

CC

Ambient Temperature Range

b

40§Cto125§C

Thermal Resistance (i

J-A

)

LM9061M 150§C/W

LM9061N 100

§

C/W

DC Electrical Characteristics

7VsV

CC

s

20V, R

REF

e

15.4 kX,b40§CsT

J

s

a

125§C, unless otherwise specified.

Symbol Parameter Conditions Min Max Units

POWER SUPPLY

I

Q

Quiescent Supply Current ON/OFFe‘‘0’’ 5 mA

I

CC

Operating Supply Current ON/OFFe‘‘1’’,

C

LOAD

e

0.025 mF,
40 mA

Includes Turn-ON
Transient Output Current

ON/OFF CONTROL INPUT

VIN(0) ON/OFF Input Logic ‘‘0’’ V

OUT

e

OFF 1.5 V

VIN(1) ON/OFF Input Logic ‘‘1’’ V

OUT

e

ON 3.5 V

V

HYST

ON/OFF Input Hysteresis Peak to Peak 0.8 2 V

I

IN

ON/OFF Input Pull-Down Current VON/OFFe5V 50 250 mA

GATE DRIVE OUTPUT

V

OH

Charge Pump Output Voltage ON/OFFe‘‘1’’ V

CC

a

7V

CC

a

15 V

V

OL

OFF Output Voltage ON/OFFe‘‘0’’,

0.9 V

I

SINK

e

110 mA

V

CLAMP

Sense to Output ON/OFFe‘‘1’’,

11 15 V

Clamp Voltage V

SENSE

e

V

THRESHOLD

I

SINK(Normal-OFF)

Output Sink Current, ON/OFFe‘‘0’’,
Normal Operation V

DELAY

e

0V, 75 145 mA

V

SENSE

e

V

THRESHOLD

I

SINK(Latch-OFF)

Output Sink Current with V

DELAY

e

7V,

515mA

Protection Comparator Tripped V

SENSE

k

V

THRESHOLD

PROTECTION CIRCUITRY

I

REF

Threshold Pin Reference Current V

SENSE

e

V

THRESHOLD

75 88 m A

V

REF

Reference Voltage 1.15 1.35 V

I

THR(LEAKAGE)

Threshold Pin Leakage Current V

CC

e

Open,

10 mA

7V

s

V

THRESHOLD

s

20V

I

SENSE

Sense Pin Input Bias Current V

SENSE

e

V

THRESHOLD

10 mA

DELAY TIMER

I

DELAY

Delay Pin Source Current 6.74 15.44 mA

V

TIMER

Delay Timer Threshold Voltage 5 6.2 V

I

DIS

Delay Capacitor Discharge Current V

DELAY

e

5V 2 10 mA

V

SAT

Discharge Transistor Saturation Voltage I

DIS

e

1 mA 0.4 V

2

AC Timing Characteristics

7VsV

CC

s

20V, R

REF

e

15.4 kX,b40§CsT

J

s

a

125§C, C

LOAD

e

0.025 mF, C

DELAY

e

0.022 mF, unless otherwise

specified.

Symbol Parameter Conditions Min Max Units

T

ON

Output Turn-ON Time C

LOAD

e

0.025 mF

7V

s

V

CC

s

10V, V

OUT

t

V

CC

a

7V 1.5 ms

10V

s

V

CC

s

20V, V

OUT

t

V

CC

a

11V 1.5 ms

T

OFF(Normal)

Output Turn-OFF Time, C

LOAD

e

0.025 mF

Normal Operation V

CC

e

14V, V

OUT

t

25V 4 10 ms

(Note 4) V

SENSE

e

V

THRESHOLD

T

OFF(Latch-OFF)

Output Turn-OFF Time, C

LOAD

e

0.025 mF

Protection Comparator Tripped V

CC

e

14V, V

OUT

t

25V 45 140 ms

(Note 4) V

SENSE

e

V

THRESHOLD

T

DELAY

Delay Timer Interval C

DELAY

e

0.022 mF 8 18 ms

Note 1: Absolute Maximum Ratings indicate the limits beyond which damage to the device may occur.

Note 2: Operating Ratings indicate conditions for which the device is intended to be functional, but may not meet the guaranteed specific performance limits. For

guaranteed specifications and test conditions see the Electrical Characteristics.

Note 3: ESD Human Body Model: 100 pF discharged through 1500X resistor.

Note 4: The AC Timing specifications for T

OFF

are not production tested, and therefore are not specifically guaranteed. Limits are provided for reference purposes

only. Smaller load capacitances will have proportionally faster turn-ON and turn-OFF times.

Block Diagram

TL/H/12317– 4

3

Typical Operating Waveforms

TL/H/12317– 5

4

Typical Electrical Characteristics

vs V

CC

Standby Supply Current

vs V

CC

Operating Supply Current

vs V

CC

Output Voltage

vs Temperature

Output Sink Current

vs Temperature

Output Sink Current

vs Output Voltage

Output Source Current

vs Temperature

Reference Voltage

vs Temperature

Delay Threshold

vs Temperature

Delay Charge Current

TL/H/12317– 06

5