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 A 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 de-
vice is continually monitored and compared against an ex-
ternally 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 A output current sink)
after programmable delay time interval.
Designed for the automotive application environment the
LM9061 has a wide operating temperature range of -40C to
+125C, remains operational with V
CC
up to 26V, and can
withstand 60V power supply transients. The LM9061 is avail-
able in an 8-pin small outline package, and an 8-pin dual
in-line package.
Features
n
Built-in charge pump for gate overdrive of high side
drive applications
n
Lossless protection of the power MOSFET
n
Programmable MOSFET protection voltage
n
Programmable delay of protection latch-OFF
n
Fast turn-ON (1.5 ms max with gate capacitance of
25000 pF)
n
Undervoltage shut OFF with V
CC
<
7V
n
Overvoltage shut OFF with V
CC
>
26V
n
Withstands 60V supply transients
n
CMOS logic compatible ON/OFF control input
n
Surface mount and dual-in-line packages available
Applications
n
Valve, relay and solenoid drivers
n
Lamp drivers
n
DC motor PWM drivers
n
Logic controlled power supply distribution switch
n
Electronic circuit breaker
Typical Application
01231701
Connection Diagrams
01231703
Top View
Order Number LM9061M
See NS Package Number M08A
01231702
Top View
Order Number LM9061N
See NS Package Number N08E
April 1995
LM9061
Power
MOSFET
Driver
with
Lossless
Protection
2001 National Semiconductor Corporation
DS012317
www.national.com
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
+15V
Voltage at Sense and Threshold
(through 1 k
)
-25V to +60V
ON/OFF Input Voltage
-0.3V to V
CC
+0.3V
Junction Temperature
150C
Storage Temperature
-55C to +150C
Lead Temperature
(Soldering, 10 seconds)
260C
Operating Ratings
(Note 2)
Supply Voltage
7V to 26V
ON/OFF Input Voltage
-0.3V to V
CC
Ambient Temperature Range
-40C to +125C
Thermal Resistance (
J-A
)
LM9061M
150C/W
LM9061N
100C/W
DC Electrical Characteristics
7V
V
CC
20V, R
REF
= 15.4 k
, -40C
T
J
+125C, unless otherwise
specified.
Symbol
Parameter
Conditions
Min
Max
Units
POWER SUPPLY
I
Q
Quiescent Supply Current
ON/OFF = "0"
5
mA
I
CC
Operating Supply Current
ON/OFF = "1",
C
LOAD
= 0.025 F,
Includes Turn-ON
Transient Output Current
40
mA
ON/OFF CONTROL INPUT
V
IN
(0)
ON/OFF Input Logic "0"
V
OUT
= OFF
1.5
V
V
IN
(1)
ON/OFF Input Logic "1"
V
OUT
= 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 = 5V
50
250
A
GATE DRIVE OUTPUT
V
OH
Charge Pump Output Voltage
ON/OFF = "1"
V
CC
+ 7
V
CC
+ 15
V
V
OL
OFF Output Voltage
ON/OFF = "0",
I
SINK
= 110 A
0.9
V
V
CLAMP
Sense to Output
Clamp Voltage
ON/OFF = "1,
V
SENSE
= V
THRESHOLD
11
15
V
I
SINK(Normal-OFF)
Output Sink Current
Normal Operation
ON/OFF = "0",
V
DELAY
= 0V,
V
SENSE
= V
THRESHOLD
75
145
A
I
SINK(Latch-OFF)
Output Sink Current with
Protection Comparator Tripped
V
DELAY
= 7V,
V
SENSE
<
V
THRESHOLD
5
15
A
PROTECTION CIRCUITRY
I
REF
Threshold Pin Reference Current
V
SENSE
= V
THRESHOLD
75
88
A
V
REF
Reference Voltage
1.15
1.35
V
I
THR(LEAKAGE)
Threshold Pin Leakage Current
V
CC
= Open,
7V
V
THRESHOLD
20V
10
A
I
SENSE
Sense Pin Input Bias Current
V
SENSE
= V
THRESHOLD
10
A
DELAY TIMER
I
DELAY
Delay Pin Source Current
6.74
15.44
A
V
TIMER
Delay Timer Threshold Voltage
5
6.2
V
I
DIS
Delay Capacitor Discharge Current
V
DELAY
= 5V
2
10
mA
V
SAT
Discharge Transistor Saturation Voltage
I
DIS
= 1 mA
0.4
V
LM9061
www.national.com
2
AC Timing Characteristics
7V
V
CC
20V, R
REF
= 15.4 k
, -40C
T
J
+125C, C
LOAD
= 0.025 F,
C
DELAY
= 0.022 F, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Max
Units
T
ON
Output Turn-ON Time
C
LOAD
= 0.025 F
7V
V
CC
10V, V
OUT
V
CC
+ 7V
1.5
ms
10V
V
CC
20V, V
OUT
V
CC
+ 11V
1.5
ms
T
OFF(NORMAL)
Output Turn-OFF Time,
Normal Operation
(Note 4)
C
LOAD
= 0.025 F
V
CC
= 14V, V
OUT
25V
V
SENSE
= V
THRESHOLD
4
10
ms
T
OFF(Latch-OFF)
Output Turn-OFF Time,
Protection Comparator Tripped
(Note 4)
C
LOAD
= 0.025 F
V
CC
= 14V, V
OUT
25V
V
SENSE
= V
THRESHOLD
45
140
ms
T
DELAY
Delay Timer Interval
C
DELAY
= 0.022 F
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 1500
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
01231704
LM9061
www.national.com
3
Typical Electrical Characteristics
(Continued)
Output Voltage vs V
CC
Output Sink Current vs Temperature
01231719
01231720
Output Sink Current vs Temperature
Output Source Current vs Output Voltage
01231721
01231722
Reference Voltage vs Temperature
Delay Threshold vs Temperature
01231723
01231724
LM9061
www.national.com
5
PDF 
ZIP