LT1158
Half Bridge N-Channel
Power MOSFET Driver
FEATURES
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DESCRIPTION
A single input pin on the LT
®
1158 synchronously controls
two N-channel power MOSFETs in a totem pole configura-
tion. Unique adaptive protection against shoot-through
currents eliminates all matching requirements for the two
MOSFETs. This greatly eases the design of high efficiency
motor control and switching regulator systems.
A continuous current limit loop in the LT1158 regulates
short-circuit current in the top power MOSFET. Higher
start-up currents are allowed as long as the MOSFET V
DS
does not exceed 1.2V. By returning the
FAULT
output to
the enable input, the LT1158 will automatically shut down
in the event of a fault and retry when an internal pull-up
current has recharged the enable capacitor.
An on-chip charge pump is switched in when needed to
turn on the top N-channel MOSFET continuously. Special
circuitry ensures that the top side gate drive is safely
maintained in the transition between PWM and DC opera-
tion. The gate-to-source voltages are internally limited to
14.5V when operating at higher supply voltages.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5365118.
Drives Gate of Top Side MOSFET Above V
+
Operates at Supply Voltages from 5V to 30V
150ns Transition Times Driving 3000pF
Over 500mA Peak Driver Current
Adaptive Non-Overlap Gate Drives
Continuous Current Limit Protection
Auto Shutdown and Retry Capability
Internal Charge Pump for DC Operation
Built-In Gate Voltage Protection
Compatible with Current-Sensing MOSFETs
TTL/CMOS Input Levels
Fault Output Indication
APPLICATIONS
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PWM of High Current Inductive Loads
Half Bridge and Full Bridge Motor Control
Synchronous Step-Down Switching Regulators
Three-Phase Brushless Motor Drive
High Current Transducer Drivers
Battery-Operated Logic-Level MOSFETs
TYPICAL APPLICATION
24V
1N4148
Top and Bottom Gate Waveforms
BOOST
T GATE DR
T GATE FB
T SOURCE
0.1μF
IRFZ34
BOOST DR
+
10μF
V
+
V
+
+
500μF
LOW
ESR
PWM
0Hz TO
100kHz
INPUT
LT1158
SENSE
+
+
R
SENSE
0.015Ω
LOAD
V
IN
= 24V
R
L
= 12Ω
1158 TA02
+
1μF
ENABLE
FAULT
BIAS
SENSE
–
B GATE DR
B GATE FB
GND
–
IRFZ34
0.01μF
LT1158 TA01
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LT1158
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (Pins 2, 10) ......................................36V
Boost Voltage (Pin 16) ..............................................56V
Continuous Output Currents (Pins 1, 9, 15) .........100mA
Sense Voltages (Pins 11, 12) .................. –5V to V
+
+ 5V
Top Source Voltage (Pin 13) ................... –5V to V
+
+ 5V
Boost to Source Voltage (V16 – V13) ........ –0.3V to 20V
Operating Temperature Range
LT1158C................................................... 0°C to 70°C
LT1158I ................................................ –40°C to 85°C
Junction Temperature (Note 2)
LT1158C............................................................ 125°C
LT1158I ............................................................. 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ................. 300°C
PIN CONFIGURATION
TOP VIEW
BOOST DR
V
+
BIAS
ENABLE
FAULT
INPUT
GND
B GATE FB
1
2
3
4
5
6
7
8
16 BOOST
15 T GATE DR
14 T GATE FB
13 T SOURCE
12 SENSE
+
11 SENSE
–
10 V
+
9
B GATE DR
BOOST DR 1
V
+
2
TOP VIEW
16 BOOST
15 T GATE DR
14 T GATE FB
13 T SOURCE
12 SENSE
+
11 SENSE
–
10 V
+
9
B GATE DR
BIAS 3
ENABLE 4
FAULT
5
INPUT 6
GND 7
B GATE FB 8
N PACKAGE
16-LEAD PLASTIC DIP
θ
JA
= 70°C/W
SW PACKAGE
16-LEAD PLASTIC (WIDE) SO
θ
JA
= 110°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1158CN#PBF
LT1158IN#PBF
LT1158CSW#PBF
LT1158ISW#PBF
LEAD BASED FINISH
LT1158CN
LT1158IN
LT1158CSW
LT1158ISW
TAPE AND REEL
LT1158CN#TRPBF
LT1158IN#TRPBF
LT1158CSW#TRPBF
LT1158ISW#TRPBF
TAPE AND REEL
LT1158CN#TR
LT1158IN#TR
LT1158CSW#TR
LT1158ISW#TR
PART MARKING*
PART MARKING*
PACKAGE DESCRIPTION
16-Lead Plastic DIP
16-Lead Plastic DIP
16-Lead Plastic (Wide) SO
16-Lead Plastic (Wide) SO
PACKAGE DESCRIPTION
16-Lead Plastic DIP
16-Lead Plastic DIP
16-Lead Plastic (Wide) SO
16-Lead Plastic (Wide) SO
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
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LT1158
ELECTRICAL CHARACTERISTICS
SYMBOL
I
2
+ I
10
PARAMETER
DC Supply Current (Note 2)
CONDITIONS
V
+
= 30V, V16 = 15V, V4 = 0.5V
V
+
= 30V, V16 = 15V, V6 = 0.8V
V
+
= 30V, V16 = 15V, V6 = 2V
V
+
= V13 = 30V, V16 = 45V, V6 = 0.8V
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Test Circuit, V
+
= V16 = 12V, V11 = V12 = V13 = 0V, Pins 1 and 4 open,
Gate Feedback pins connected to Gate Drive pins unless otherwise specified.
LT1158I
MIN
4.5
8
0.8
0.9
1.3
15
9
40
12
12
1
1
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LT1158C
MAX
3
10
18
4.5
2
15
1.4
1.7
35
47
17
17
2.5
2
1
1
130
170
180
1.4
250
550
250
250
400
200
85
120
120
1.1
0.85
1.2
15
9
40
12
12
1
1
0.8
MIN
4.5
8
TYP
2.2
7
13
3
1.4
5
1.15
1.5
25
11
43
14.5
14.5
1.75
1.5
0.1
0.5
110
150
1.25
130
350
120
130
200
100
MAX
3
10
18
4.5
2
15
1.4
1.8
35
47
17
17
2.5
2
1
1
135
180
180
1.4
250
550
250
250
400
200
UNITS
mA
mA
mA
mA
V
μA
V
V
μA
V
V
V
V
V
V
μA
V
mV
mV
mV
V
ns
ns
ns
ns
ns
ns
TYP
2.2
7
13
3
1.4
5
1.15
1.5
25
11
43
14.5
14.5
1.75
1.5
0.1
0.5
I
16
V6
I
6
V4
ΔV4
I
4
V15
V9
V1
V8
I
5
V5
Boost Current
Input Threshold
Input Current
Enable Low Threshold
Enable Hysteresis
Enable Pullup Current
Charge Pump Voltage
Bottom Gate “ON” Voltage
Boost Drive Voltage
Bottom Turn-Off Threshold
Fault Output Leakage
Fault Output Saturation
V6 = 5V
V6 = 0.8V, Monitor V9
V6 = 0.8V, Monitor V9
V4 = 0V
V
+
= 5V, V6 = 2V, Pin 16 open, V13
→
5V
V
+
= 30V, V6 = 2V, Pin16 open, V13
→
30V
V
+
= V16 = 18V, V6 = 0.8V
V
+
= V16 = 18V, V6 = 0.8V, 100mA Pulsed Load
V
+
= V16 = 5V, V6 = 0.8V
V
+
= V16 = 5V, V6 = 2V
V
+
= 30V, V16 = 15V, V6 = 2V
V
+
= 30V, V16 = 15V, V6 = 2V, I
5
= 10mA
V
+
= 30V, V16 = 15V, V6 = 2V, I
5
= 100μA
V
+
= 30V, V16 = 15V, V6 = 2V, Closed Loop
V
+
= V12 = 12V, V6 = 2V, Decrease V11
Until V15 Goes Low
Pin 6 (+) Transition, Meas. V15 – V13 (Note 4)
Pin 6 (–) Transition, Meas. V15 – V13 (Note 4)
Pin 6 (–) Transition, Meas. V15 – V13 (Note 4)
Pin 6 (–) Transition, Meas. V9 (Note 4)
Pin 6 (+) Transition, Meas. V9 (Note 4)
Pin 6 (+) Transition, Meas. V9 (Note 4)
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V14 – V13 Top Turn-Off Threshold
V12 – V11 Fault Conduction Threshold
V12 – V11 Current Limit Threshold
V12 – V11 Current Limit Inhibit
V
DS
Threshold
t
R
t
D
t
F
t
R
t
D
t
F
Top Gate Rise Time
Top Gate Turn-Off Delay
Top Gate Fall Time
Bottom Gate Rise Time
Bottom Gate Turn-Off Delay
Bottom Gate Fall Time
90
l
110
150
1.25
130
350
120
130
200
100
130
120
1.1
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Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LT1158IN, LT1158CN: T
J
= T
A
+ (P
D
×
70°C/W)
LT1158ISW, LT1158CSW: T
J
= T
A
+ (P
D
×
110°C/W)
Note 3:
Dynamic supply current is higher due to the gate charge
being delivered at the switching frequency. See typical performance
characteristics and applications information.
Note 4:
Gate rise times are measured from 2V to 10V, delay times are
measured from the input transition to when the gate voltage has decreased
to 10V, and fall times are measured from 10V to 2V.
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LT1158
TYPICAL PERFORMANCE CHARACTERISTICS
DC Supply Current
14
I
2
+ I
10
+ I
16
12
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
INPUT HIGH
10
INPUT LOW
8
6
4
2
0
0
5
10
15 20 25 30
SUPPLY VOLTAGE (V)
35
40
ENABLE LOW
V13 = V
+
V13 = 0V
12
10
8
INPUT LOW
6
4
2
0
–50 –25
ENABLE LOW
14
I
2
+ I
10
+ I
16
V
+
= 12V
25
SUPPLY CURRENT (mA)
INPUT HIGH
20
15
10
5
0
1
10
INPUT FREQUENCY (kHz)
100
LT1158 G03
DC Supply Current
30
Dynamic Supply Current (V
+
)
50% DUTY CYCLE
C
GATE
= 3000pF
V
+
= 24V
V
+
= 12V
V
+
= 6V
50
25
75
0
TEMPERATURE (°C)
100
125
LT1158 G01
LT1158 G02
Dynamic Supply Current
40
35
SUPPLY CURRENT (mA)
30
25
20
15
10
5
0
1
10
INPUT FREQUENCY (kHz)
100
LT1158 G04
Charge Pump Output Voltage
50
INPUT THRESHOLD VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
45
40
TOP GATE VOLTAGE (V)
35
30
25
20
15
10
5
0
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
0.8
35
40
10μA LOAD
NO LOAD
Input Thresholds
50% DUTY CYCLE
V
+
= 12V
V(HIGH)
–40°C
+25°C
+85°C
–40°C
+25°C
+85°C
V(LOW)
C
GATE
= 10000pF
C
GATE
= 3000pF
C
GATE
= 1000pF
1.0
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
40
LT1158 G05
LT1158 G06
Enable Thresholds
3.5
FAULT CONDUCTION THRESHOLD (mV)
ENABLE THRESHOLD VOLTAGE (V)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
5
10
15 20 25 30
SUPPLY VOLTAGE (V)
35
40
V(LOW)
–40°C
+25°C
+85°C
V(HIGH)
–40°C
+25°C
+85°C
160
150
140
130
120
110
100
90
80
70
60
Fault Conduction Threshold
200
V11 = 0V
CURRENT LIMIT THRESHOLD (mV)
190
180
170
160
150
140
130
120
110
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
100
40
Current Limit Threshold
CLOSED LOOP
+85°C
+25°C
–40°C
+85°C
+25°C
–40°C
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
40
LT1158 G07
LT1158 G08
LT1158 G09
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LT1158
TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit Inhibit
V
DS
Threshold
1.50
CURRENT LIMIT INHIBIT THRESHOLD (V)
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
40
–40°C
+25°C
+85°C
V2 – V11
BOTTOM GATE RISE TIME (ns)
400
350
300
250
200
150
100
50
0
0
5
C
GATE
= 1000pF
C
GATE
= 3000pF
C
GATE
= 10000pF
BOTTOM GATE FALL TIME (ns)
Bottom Gate Rise Time
400
350
300
250
200
150
100
50
40
0
Bottom Gate Fall Time
C
GATE
= 10000pF
C
GATE
= 3000pF
C
GATE
= 1000pF
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
40
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
LT1158 G10
LT1158 G11
LT1158 G12
Top Gate Rise Time
400
350
TOP GATE FALL TIME (ns)
TOP GATE RISE TIME (ns)
300
250
200
150
100
50
0
0
5
C
GATE
= 1000pF
C
GATE
= 3000pF
C
GATE
= 10000pF
400
350
Top Gate Fall Time
800
700
C
GATE
= 10000pF
TRANSITION TIMES (ns)
600
500
400
300
200
100
0
5
10 15 20 25 30
SUPPLY VOLTAGE (V)
35
40
0
Transition Times vs R
Gate
V
+
= 12V
C
GATE
= 3000pF
300
250
200
150
100
RISE TIME
FALL TIME
C
GATE
= 3000pF
C
GATE
= 1000pF
50
35
40
0
10 15 20 25 30
SUPPLY VOLTAGE (V)
0
10 20 30 40 50 60 70 80 90 100
GATE RESISTANCE (Ω)
LT1158 G15
LT1158 G13
LT1158 G14
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