LTC1154
High Side Micropower
MOSFET Driver
FEATURES
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DESCRIPTION
The LTC
®
1154 single high side gate driver allows using low
cost N-channel FETs for high side switching applications. An
internal charge pump boosts the gate drive voltage above
the positive rail, fully enhancing an N-channel MOS switch
with no external components. Micropower operation, with
8μA standby current and 85μA operating current, allows
use in virtually all systems with maximum efficiency.
Included on chip is programmable overcurrent sensing.
A time delay can be added to prevent false triggering on
high inrush current loads. An active high shutdown input
is also provided and interfaces directly to a standard PTC
thermistor for thermal shutdown. An open-drain output
is provided to report switch status to the μP An active
.
low enable input is provided to control multiple switches
in banks.
The LTC1154 is available in both 8-pin DIP and 8-pin SOIC
packages.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Fully Enhances N-Channel Power MOSFETs
8μA I
Q
Standby Current
85μA I
Q
ON Current
No External Charge Pump Capacitors
4.5V to 18V Supply Range
Short-Circuit Protection
Thermal Shutdown via PTC Thermistor
Status Output Indicates Shutdown
Available in 8-Pin SOIC and PDIP Packages
APPLICATIONS
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Laptop Computer Power Switching
SCSI Termination Power Switching
Cellular Telephone Power Management
Battery Charging and Management
High Side Industrial and Automotive Switching
Stepper Motor and DC Motor Control
TYPICAL APPLICATION
Ultralow Voltage Drop High Side Switch with
Short-Circuit Protection
5V
51k
IN
μP
EN
LTC1154
STATUS
GND
G
SD
IRLR024
V
S
0.1μF**
200k**
DS
0.036Ω*
2.7A MAX
SUPPLY CURRENT (μA)
Standby Supply Current
50
45
40
35
30
25
20
15
10
5
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1153 • TA02
V
IN
= 0V
T
J
= 25°C
5V
LOAD
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.
* IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700
** NOT REQUIRED IF LOAD IS RESISTIVE OR INDUCTIVE.
LTC1154 • TA01
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LTC1154
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage ..........................................................22V
Input Voltage.......................(V
S
+ 0.3V) to (GND – 0.3V)
Enable Input Voltage ...........(V
S
+ 0.3V) to (GND – 0.3V)
Gate Voltage .........................(V
S
+ 24V) to (GND – 0.3V)
Status Output Voltage ...............................................15V
Current (Any Pin) ...................................................50mA
Operating Temperature
LTC1154C ................................................ 0°C to 70°C
LTC1154H .......................................... –40°C to 150°C
Storage Temperature Range....................–65°c to 150°C
Lead Temperature (Soldering, 10 sec.) ................. 300°C
PIN CONFIGURATION
TOP VIEW
IN 1
ENABLE
2
STATUS 3
GND 4
8
7
6
5
V
S
DRAIN SENSE
GATE
SHUTDOWN
IN 1
ENABLE
2
STATUS 3
GND 4
TOP VIEW
8
7
6
5
V
S
DRAIN SENSE
GATE
SHUTDOWN
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 100°C,
θ
JA
= 130°C/W
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 100°C,
θ
JA
= 150°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1154CN8#PBF
LTC1154CS8#PBF
LTC1154HS8#PBF
LEAD BASED FINISH
LTC1154CN8
LTC1154CS8
LTC1154HS8
TAPE AND REEL
LTC1154CN8#TRPBF
LTC1154CS8#TRPBF
LTC1154HS8#TRPBF
TAPE AND REEL
LTC1154CN8#TR
LTC1154CS8#TR
LTC1154HS8#TR
1154
1154H
1154
1154H
PART MARKING
PART MARKING
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic SIOC
8-Lead Plastic SIOC
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic SIOC
8-Lead Plastic SIOC
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 150°C
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
= 4.5V to 18V, T
A
= 25°C, V
EN
= 0V, V
SD
= 0V unless otherwise noted.
SYMBOL
V
S
I
Q
PARAMETER
Supply Voltage
Quiescent Current OFF
Quiescent Current ON
Quiescent Current ON
V
INH
Input High Voltage
V
S
= 5V, V
IN
= 0V
V
S
= 5V, V
IN
= 5V
V
S
= 12V, V
IN
= 5V
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
4.5
TYP
8
85
180
MAX
18
20
120
400
UNITS
V
μA
μA
μA
V
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2
LTC1154
ELECTRICAL CHARACTERISTICS
SYMBOL
V
INL
I
IN
C
IN
V
ENH
V
ENL
I
EN
V
SDH
V
SDL
I
SD
V
SEN
I
SEN
V
GATE
– V
S
PARAMETER
Input Low Voltage
Input Current
Input Capacitance
ENABLE
Input High Voltage
ENABLE
Input Low Voltage
ENABLE
Input Current
Shutdown Input High Voltage
Shutdown Input Low Voltage
Shutdown Input Current
Drain Sense Threshold Voltage
Drain Sense Input Current
Gate Voltage Above Supply
0V < V
SEN
< V
S
V
S
= 5V
V
S
= 6V
V
S
= 12V
I
STAT
= 400μA
V
STAT
= 12V
V
S
= 5V, C
GATE
= 1000pF
Time for V
GATE
> V
S
+ 2V
Time for V
GATE
> V
S
+ 5V
V
S
= 12V, C
GATE
= 1000pF
Time for V
GATE
> V
S
+ 5V
Time for V
GATE
> V
S
+ 10V
t
OFF
t
SC
t
SD
Turn-OFF Time
Short-Circuit Turn-OFF Time
Shutdown Turn-OFF Time
V
S
= 5V, C
GATE
= 1000pF Time for V
GATE
< 1V
,
,
V
S
= 12V, C
GATE
= 1000pF Time for V
GATE
< 1V
V
S
= 5V, C
GATE
= 1000pF Time for V
GATE
< 1V
,
,
V
S
= 12V, C
GATE
= 1000pF Time for V
GATE
< 1V
V
S
= 5V, C
GATE
= 1000pF Time for V
GATE
< 1V
,
,
V
S
= 12V, C
GATE
= 1000pF Time for V
GATE
< 1V
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.
0V < V
IN
< V
S
0V < V
IN
< V
S
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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. V
S
= 4.5V to 18V, T
A
= 25°C, V
EN
= 0V, V
SD
= 0V unless otherwise noted.
CONDITIONS
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MIN
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TYP
MAX
0.8
±1
UNITS
V
μA
pF
V
0V < V
IN
< V
S
5
3.5
2.6
1
2
0.8
±1
80
75
6
7.5
15
100
100
7
8.3
18
0.05
120
125
±0.1
9
15
25
0.4
1
30
100
20
50
10
10
5
5
110
450
80
160
36
28
25
23
17
13
300
1000
200
500
60
60
40
40
40
35
0.6
±1
V
μA
V
V
μA
mV
mV
μA
V
V
V
V
μA
μs
μs
μs
μs
μs
μs
μs
μs
μs
μs
V
STAT
I
STAT
t
ON
Status Output Low Voltage
Status Output Leakage Current
Turn-ON Time
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LTC1154
TYPICAL PERFORMANCE CHARACTERISTICS
Standby Supply Current
50
45
40
SUPPLY CURRENT (μA)
SUPPLY CURRENT (μA)
35
30
25
20
15
10
5
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC01
Supply Current ON
1000
24
T
A
= 25°C
22
20
18
V
GATE
– V
S
(V)
16
14
12
10
8
6
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC02
High Side Gate Voltage
V
IN
= 0V
T
A
= 25°C
900
800
700
600
500
400
300
200
100
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC03
Input Threshold Voltage
2.4
2.2
INPUT THRESHOLD VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0
5
15
10
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC04
Drain Sense Threshold Voltage
150
DRAIN SENSE THRESHOLD VOLTAGE (mV)
140
130
120
V
GATE
(V)
110
100
90
80
70
60
50
0
5
15
10
SUPPLY VOLTAGE (V)
20
30
27
24
21
18
15
12
9
6
3
0
Low Side Gate Voltage
V
ON
V
OFF
0
2
4
6
SUPPLY VOLTAGE (V)
8
10
LTC1154 • TPC06
Turn-ON Time
1000
900
800
TURN-OFF TIME (μs)
TURN-ON TIME (μs)
700
600
500
400
300
200
100
0
0
5
V
GS
= 5V
C
GATE
= 1000pF
50
45
40
35
30
25
20
15
10
5
20
LTC1153 • TPC07
Turn-OFF Time
50
C
GATE
= 1000pF
TIME FOR V
GATE
< 1V
TURN-OFF TIME (μs)
45
40
35
30
25
20
15
10
5
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC08
Short-Circuit Turn-OFF Delay
Time
C
GATE
= 1000pF
TIME FOR V
GATE
< 1V
V
SEN
= V
S
– 1V
NO EXTERNAL DELAY
V
GS
= 2V
10
15
SUPPLY VOLTAGE (V)
0
0
5
10
15
SUPPLY VOLTAGE (V)
20
LTC1154 • TPC09
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LTC1154
TYPICAL PERFORMANCE CHARACTERISTICS
Standby Supply Current
50
45
40
SUPPLY CURRENT (μA)
35
30
25
20
15
10
5
0
–50
–25
V
S
= 18V
V
S
= 5V
50
25
0
75
TEMPERATURE (°C)
100
125
SUPPLY CURRENT (μA)
V
IN
= 0V
V
EN
= 0V
1000
900
800
700
600
500
400
300
200
100
0
–50
V
S
= 5V
V
S
= 12V
INPUT THRESHOLD VOLTAGE (V)
V
IN
= 5V
V
EN
= 0V
Supply Current ON
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
100
125
Input ON Threshold Voltage
V
S
= 5V
V
S
= 18V
–25
25
0
50
75
TEMPERATURE (°C)
0.4
–50
–25
25
0
50
75
TEMPERATURE (°C)
100
125
LTC1154 • TPC10
LTC1154 • TPC11
LTC1154 • TPC12
Shutdown Threshold Voltage
2.4
SHUTDOWN THRESHOLD VOLTAGE (V)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
–50
–25
25
0
50
75
TEMPERATURE (°C)
100
125
V
S
= 5V
V
S
= 18V
ENABLE THRESHOLD VOLTAGE (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
ENABLE
Threshold Voltage
V
S
= 12V
1000
Gate Drive Current
T
A
= 25°C
GATE DRIVE CURRENT (μA)
100
V
S
= 18V
V
S
= 12V
10
DISABLE
1
V
S
= 5V
ENABLE
–25
25
0
50
75
TEMPERATURE (°C)
100
125
0.1
0
4
8
12
16
GATE VOLTAGE ABOVE SUPPLY (V)
20
0
–50
LTC1154 • TPC13
LTC1154 • TPC14
LTC1154 • TPC15
PIN FUNCTIONS
Input and Shutdown Pins
The LTC1154 input pin is active high and activates all of the
protection and charge pump circuitry when switched ON.
The shutdown pin is designed to immediately disable the
switch if a secondary fault condition (over temperature,
etc.) is detected. The LTC1154 logic and shutdown inputs
are high impedance CMOS gates with ESD protection
diodes to ground and supply and therefore should not be
forced beyond the power supply rails. The shutdown pin
should be connected to ground when not in use.
ENABLE
Input Pin
The
ENABLE
input can be used to enable a number of
LTC1154 high side switches in banks or to provide a sec-
ondary means of control. It can also act as an inverting
input. The
ENABLE
input is a high impedance CMOS gate
with ESD clamp diodes to ground and supply and therefore
should not be forced beyond the power supply rails. This
pin should be grounded when not in use.
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