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 mini-
mize 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 circuit-
ry 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 V
CC
up 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
C1995 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 to
a
60V
ON OFF Input Voltage
b
0 3V to V
CC
a
0 3V
Junction Temperature
150 C
Storage Temperature
b
55 C to 150 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 C to 125 C
Thermal Resistance (i
J-A
)
LM9061M
150 C W
LM9061N
100 C W
DC Electrical Characteristics
7V
s
V
CC
s
20V R
REF
e
15 4 kX
b
40 C
s
T
J
s
a
125 C unless otherwise specified
Symbol
Parameter
Conditions
Min
Max
Units
POWER SUPPLY
I
Q
Quiescent Supply Current
ON OFF
e
``0''
5
mA
I
CC
Operating Supply Current
ON OFF
e
``1''
C
LOAD
e
0 025 mF
40
mA
Includes Turn-ON
Transient Output Current
ON OFF CONTROL INPUT
V
IN
(0)
ON OFF Input Logic ``0''
V
OUT
e
OFF
1 5
V
V
IN
(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 OFF
e
5V
50
250
m
A
GATE DRIVE OUTPUT
V
OH
Charge Pump Output Voltage
ON OFF
e
``1''
V
CC
a
7
V
CC
a
15
V
V
OL
OFF Output Voltage
ON OFF
e
``0''
0 9
V
I
SINK
e
110 mA
V
CLAMP
Sense to Output
ON OFF
e
``1''
11
15
V
Clamp Voltage
V
SENSE
e
V
THRESHOLD
I
SINK(Normal-OFF)
Output Sink Current
ON OFF
e
``0''
Normal Operation
V
DELAY
e
0V
75
145
m
A
V
SENSE
e
V
THRESHOLD
I
SINK(Latch-OFF)
Output Sink Current with
V
DELAY
e
7V
5
15
m
A
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
m
A
7V
s
V
THRESHOLD
s
20V
I
SENSE
Sense Pin Input Bias Current
V
SENSE
e
V
THRESHOLD
10
m
A
DELAY TIMER
I
DELAY
Delay Pin Source Current
6 74
15 44
m
A
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
7V
s
V
CC
s
20V R
REF
e
15 4 kX
b
40 C
s
T
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
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