首页 |元器件品牌

LTC1154CS8#PBF [Linear]

LTC1154 - High-Side Micropower MOSFET Driver; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
LTC1154CS8#PBF
型号： LTC1154CS8#PBF
厂家： Linear    Linear
描述：

LTC1154 - High-Side Micropower MOSFET Driver; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C

驱动器 接口集成电路 光电二极管
文件： 总16页 (文件大小：334K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
 查看货源
LTC1154  
High-Side Micropower  
MOSFET Driver  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
■
■
■
■
■
■
Fully Enhances N-Channel Power MOSFETs  
8µA IQ Standby Current  
TheLTC1154singlehigh-sidegatedriverallowsusinglow  
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 opera-  
tion, with 8µA standby current and 85µA operating cur-  
rent, allows use in virtually all systems with maximum  
efficiency.  
85µA IQ 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  
Included on chip is programmable over-current sensing.  
A time delay can be added to prevent false triggering on  
high in-rush 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.  
O U  
PPLICATI  
S
A
■
■
■
■
■
■
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  
The LTC1154 is available in both 8-pin DIP and 8-pin SOIC  
packages.  
U
O
TYPICAL APPLICATI  
Ultra-Low Voltage Drop High-Side Switch  
with Short-Circuit Protection  
Standby Supply Current  
50  
5V  
V
J
= 0V  
IN  
51k  
45  
40  
35  
30  
25  
20  
15  
10  
5
0.036Ω*  
0.1µF**  
2.7A MAX  
T
= 25°C  
IN  
V
S
200k**  
µP  
EN  
DS  
G
LTC1154  
STATUS  
IRLR024  
GND  
SD  
5V  
LOAD  
LTC1154 • TA01  
0
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.  
* IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700  
** NOT REQUIRED IF LOAD IS RESISTIVE OR INDUCTIVE.  
0
5
10  
15  
20  
SUPPLY VOLTAGE (V)  
LTC1153 • TA02  
1
LTC1154  
W W W  
U
ABSOLUTE AXI U RATI GS  
Current (Any Pin).................................................. 50mA  
Operating Temperature  
LTC1154C .............................................. 0°C to 70°C  
Storage Temperature Range ................. –65°c to 150°C  
Lead Temperature (Soldering, 10 sec.)................ 300°C  
Supply Voltage ........................................................ 22V  
Input Voltage ..................... (VS + 0.3V) to (GND – 0.3V)  
Enable Input Voltage.......... (VS + 0.3V) to (GND – 0.3V)  
Gate Voltage ....................... (VS + 24V) to (GND – 0.3V)  
Status Output Voltage.............................................. 15V  
W
U
/O  
PACKAGE RDER I FOR ATIO  
ORDER PART  
ORDER PART  
TOP VIEW  
TOP VIEW  
NUMBER  
NUMBER  
IN  
ENABLE  
STATUS  
GND  
1
2
3
4
V
IN  
ENABLE  
STATUS  
GND  
1
2
3
4
8
7
6
5
V
S
8
7
6
5
S
DRAIN SENSE  
GATE  
DRAIN SENSE  
GATE  
LTC1154CS8  
LTC1154CN8  
SHUTDOWN  
SHUTDOWN  
N8 PACKAGE  
8-LEAD PLASTIC DIP  
S8 PACKAGE  
8-LEAD PLASTIC SOIC  
LTC1154 • PO01  
LTC1154 • PO02  
S8 PART MARKING  
1154  
TJMAX = 100°C, θJA = 130°C/W (N8)  
TJMAX = 100°C, θJA = 150°C/W  
ELECTRICAL CHARACTERISTICS VS = 4.5V to 18V, TA = 25°C, VEN = 0V, VSD = 0V unless otherwise noted.  
LTC1154C  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
18.0  
20  
UNITS  
V
V
S
Supply Voltage  
●
4.5  
I
I
I
Quiescent Current OFF  
Quiescent Current ON  
Quiescent Current ON  
Input High Voltage  
V = 5V, V = 0V  
8
µA  
µA  
µA  
V
Q
Q
Q
S
IN  
V = 5V, V = 5V  
85  
120  
400  
S
IN  
V = 12V, V = 5V  
180  
S
IN  
V
INH  
V
INL  
●
●
●
2
Input Low Voltage  
0.8  
V
I
Input Current  
0V < V < V  
±1  
µA  
pF  
V
IN  
IN  
S
C
V
V
Input Capacitance  
5
IN  
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  
●
●
●
●
●
●
3.5  
2
2.6  
1.0  
ENH  
ENL  
0.6  
V
I
0V < V < V  
±1  
µA  
V
EN  
IN  
S
V
SDH  
V
SDL  
0.8  
V
I
0V < V < V  
±1  
µA  
SD  
IN  
S
V
SEN  
80  
75  
100  
100  
120  
125  
mV  
mV  
●
●
I
Drain Sense Input Current  
0V < V  
< V  
±0.1  
µA  
SEN  
SEN  
S
2
LTC1154  
ELECTRICAL CHARACTERISTICS VS = 4.5V to 18V, TA = 25°C, VEN = 0V, VSD = 0V unless otherwise noted.  
LTC1154C  
TYP  
SYMBOL  
PARAMETER  
CONDITIONS  
V = 5V  
MIN  
MAX  
UNITS  
V
GATE  
– V Gate Voltage Above Supply  
●
●
●
6.0  
7.5  
15.0  
7.0  
8.3  
18.0  
9.0  
15.0  
25.0  
V
V
V
S
S
V = 6V  
S
V = 12V  
S
V
Status Output Low Voltage  
Status Output Leakage Current  
Turn-ON Time  
I
= 400µA  
STAT  
●
●
0.05  
0.4  
1
V
STAT  
STAT  
ON  
I
t
V
= 12V  
µA  
STAT  
V = 5V, C  
Time for V  
Time for V  
= 1000pF  
S
GATE  
GATE  
GATE  
> V + 2V  
30  
100  
110  
450  
300  
1000  
µs  
µs  
S
> V + 5V  
S
V = 12V, C  
= 1000pF  
S
GATE  
Time for V  
Time for V  
> V + 5V  
20  
50  
80  
160  
200  
500  
µs  
µs  
GATE  
GATE  
S
> V + 10V  
S
t
t
t
Turn-OFF Time  
V = 5V, C  
Time for V  
= 1000pF  
< 1V  
OFF  
SC  
S
GATE  
GATE  
10  
10  
5
36  
28  
25  
23  
17  
13  
60  
60  
40  
40  
40  
35  
µs  
µs  
µs  
µs  
µs  
µs  
V = 12V, C  
= 1000pF  
S
GATE  
Time for V  
< 1V  
GATE  
Short-Circuit Turn-OFF Time  
Shutdown Turn-OFF Time  
V = 5V, C  
= 1000pF  
< 1V  
S
GATE  
Time for V  
GATE  
V = 12V, C  
= 1000pF  
S
GATE  
Time for V  
< 1V  
5
GATE  
V = 5V, C  
Time for V  
= 1000pF  
< 1V  
SD  
S
GATE  
GATE  
V = 12V, C  
= 1000pF  
S
GATE  
Time for V  
< 1V  
GATE  
The  
●
denotes specifications which apply over the operating temperature range.  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Standby Supply Current  
High-Side Gate Voltage  
Supply Current ON  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
24  
22  
20  
18  
16  
14  
12  
10  
8
T
A
= 25°C  
V
A
= 0V  
IN  
T
= 25°C  
6
0
0
0
5
10  
15  
20  
0
5
10  
15  
20  
0
5
10  
15  
20  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
LTC1154 • TPC01  
LTC1154 • TPC02  
LTC1154 • TPC03  
3
LTC1154  
TYPICAL PERFOR A CE CHARACTERISTICS  
U W  
Input Threshold Voltage  
Low-Side Gate Voltage  
Drain Sense Threshold Voltage  
2.4  
2.2  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
150  
140  
130  
120  
110  
100  
90  
30  
27  
24  
21  
V
ON  
18  
15  
V
OFF  
12  
9
80  
70  
6
3
0
60  
50  
0
5
10  
15  
20  
10  
SUPPLY VOLTAGE (V)  
20  
0
5
15  
0
2
4
6
8
10  
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
LTC1154 • TPC04  
LTC1154 • TPC05  
LTC1154 • TPC06  
Turn-ON Time  
Turn-OFF Time  
Short-Circuit Turn-OFF Delay Time  
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
C
GATE  
= 1000pF  
C
= 1000pF  
C
= 1000pF  
GATE  
GATE  
TIME FOR V  
< 1V  
TIME FOR V  
< 1V  
GATE  
GATE  
V
SEN  
= V – 1V  
S
NO EXTERNAL DELAY  
V
GS  
= 5V  
V
= 2V  
GS  
0
0
10  
SUPPLY VOLTAGE (V)  
20  
0
5
10  
SUPPLY VOLTAGE (V)  
15  
20  
0
5
10  
SUPPLY VOLTAGE (V)  
15  
20  
0
5
15  
LTC1153 • TPC07  
LTC1154 • TPC08  
LTC1154 • TPC09  
Standby Supply Current  
Input ON Threshold Voltage  
Supply Current ON  
50  
45  
40  
35  
30  
25  
20  
15  
10  
5
1000  
900  
800  
700  
600  
500  
400  
300  
200  
100  
0
2.4  
2.2  
2.0  
1.8  
1.6  
1.4  
1.2  
1.O  
0.8  
0.6  
0.4  
V
V
= 0V  
= 0V  
V
V
= 5V  
= 0V  
IN  
EN  
IN  
EN  
V
V
= 5V  
S
S
= 18V  
V
= 12V  
= 5V  
S
V
= 18V  
S
V
S
V
= 5V  
75 100 125  
S
0
–50  
0
25  
50  
–50  
0
25  
50  
75  
125  
–50  
0
25  
50  
75  
125  
–25  
–25  
100  
–25  
100  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
LTC1154 • TPC10  
LTC1154 • TPC11  
LTC1154 • TPC12  
4
LTC1154  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
Shutdown Threshold Voltage  
ENABLE Threshold Voltage  
Gate Drive Current  
5.0  
4.5  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
2.4  
2.2  
2.0  
1.8  
1.6  
1.4  
1.2  
1.O  
0.8  
0.6  
0.4  
1000  
100  
10  
V
= 12V  
T
A
= 25°C  
S
V
= 18V  
S
DISABLE  
V
= 12V  
S
V
V
= 5V  
S
= 18V  
S
V
= 5V  
S
1
ENABLE  
0.1  
–50  
–25  
0
25  
50  
75 100 125  
–50  
0
25  
50  
75 100 125  
–25  
0
4
8
12  
16  
20  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
GATE VOLTAGE ABOVE SUPPLY (V)  
LTC1154 • TPC15  
LTC1154 • TPC14  
LTC1154 • TPC13  
U
U
U
PI FU CTIO S  
few hundred kΩ). Care should be taken to minimize any  
loading of this pin by parasitic resistance to ground or  
supply.  
Input and Shutdown Pins  
TheLTC1154inputpinisactivehighandactivatesallofthe  
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.  
Supply Pin  
The supply pin of the LTC1154 serves two vital purposes.  
The first is obvious: it powers the input, gate drive, regu-  
lation and protection circuitry. The second purpose is less  
obvious: it provides a Kelvin connection to the top of the  
drain sense resistor for the internal 100mV reference.  
The LTC1154 is designed to be continuously powered so  
that the gate of the MOSFET is actively driven at all times.  
If it is necessary to remove power from the supply pin and  
then re-apply it, the input pin (or enable pin) should be  
cycled a few milliseconds after the power is re-applied to  
reset the input latch and protection circuitry. Also, the  
input and enable pins should be isolated with 10k resistors  
to limit the current flowing through the ESD protection  
diodes to the supply pin.  
ENABLE Input Pin  
The ENABLE input can be used to enable a number of  
LTC1154 high-side switches in banks or to provide a  
secondary 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 there-  
fore should not be forced beyond the power supply rails.  
This pin should be grounded when not in use.  
The supply pin of the LTC1154 should never be forced  
below ground as this may result in permanent damage to  
the device. A 300Ω resistor should be inserted in series  
with the ground pin if negative supply voltage transients  
are anticipated.  
Gate Drive Pin  
The gate drive pin is either driven to ground when the  
switch is turned OFF or driven above the supply rail when  
the switch is turned ON. This pin is a relatively high  
impedance when driven above the rail (the equivalent of a  
5
LTC1154  
U
U
U
PI FU CTIO S  
Drain Sense Pin  
sense pin to ensure that the drain sense circuitry does not  
false-triggerduringstart-up. Thistimeconstantcanbeset  
fromafewmicrosecondstomanyseconds.However,very  
longdelaysmayputtheMOSFETinriskofbeingdestroyed  
byashort-circuitcondition. (seeApplicationsInformation  
Section).  
The drain sense pin is compared against the supply pin  
voltage.Ifthevoltageatthispinismorethan100mVbelow  
thesupplypin,theinputlatchwillberesetandtheMOSFET  
gatewillbequicklydischarged.Cycletheinput,orENABLE  
input, to reset the short-circuit latch and turn the MOSFET  
back on.  
Status Pin  
This pin is also a high impedance CMOS gate with ESD  
protection and therefore should not be forced beyond the  
power supply rails. To defeat the over current protection,  
short the drain sense to supply.  
The status pin is an open-drain output which is driven low  
whenever a fault condition is detected. A 51k pull-up  
resistor should be connected between this output and a  
logic supply. The status pins of multiple LTC1154s can be  
OR’d together if independent fault sensing is not required.  
No connection is required to this pin when not in use.  
Some loads, such as large supply capacitors, lamps, or  
motors require high in-rush currents. An RC time delay  
can be added between the sense resistor and the drain  
W
BLOCK DIAGRA  
DRAIN  
SENSE  
ANALOG SECTION  
V
S
SHUTDOWN  
TTL-TO-CMOS  
CONVERTER  
10µs  
DELAY  
COMP  
SHUTDOWN  
GATE  
LOW STANDBY  
CURRENT  
REGULATOR  
100mV  
REFERENCE  
GATE CHARGE  
AND DISCHARGE  
CONTROL LOGIC  
ANALOG DIGITAL  
R
INPUT  
LATCH  
TTL-TO-CMOS  
CONVERTER  
VOLTAGE  
REGULATORS  
INPUT  
OSCILLATOR  
AND CHARGE  
PUMP  
FAST/SLOW  
GATE CHARGE  
LOGIC  
ONE  
SHOT  
S
ENABLE  
GND  
FAULT DETECTION  
AND STATUS  
OUTPUT DRIVER  
STATUS  
LTC1154 • BD01  
6
LTC1154  
TRUTH TABLE  
The Truth Table demonstrates how the LTC1154 receives  
inputs and returns status information to the µP. The  
ENABLE and input signal from the µP controls the switch  
in its normal operating mode, where the rise and fall time  
of the gate drive are controlled to limit EMI and RFI  
emissions. The shutdown and over-current detection cir-  
cuitry however, switch the gate off at a much higher rate  
to limit the exposure of the MOSFET switch and the load to  
dangerousconditions.Thestatuspinremainshighaslong  
as the switch is operating normally, and is driven low only  
when a fault condition is detected. Note that the shutdown  
pin is edge-sensitive and latches the output off even if the  
shutdown pin returns to a low state.  
INPUTS  
OUTPUTS  
SD GATE STATUS  
SWITCH  
CONDITION  
IN  
X
EN  
H
X
X
X
L
L
L
L
H
L
H
H
H
L
SWITCH OFF  
SWITCH OFF  
SWITCH ON  
L
H
H
L
L
SWITCH LATCHED OFF  
(OVER CURRENT)  
H
L
L
L
SWITCH LATCHED OFF  
(SHUTDOWN)  
L = LOGIC LOW  
H = LOGIC HIGH  
X = IRRELEVANT  
= EDGE TRIGGERED  
U
LTC1154 OPERATIO  
The LTC1154 is a single micropower MOSFET driver with  
built-inprotection,statusfeedbackandgatechargepump.  
The LTC1154 consists of the following functional blocks:  
pump logic is not coupled into the 100mV reference or the  
analog comparator.  
Gate Charge Pump  
TTL and CMOS Compatible Inputs  
Gate drive for the MOSFET switch is produced by an  
adaptive charge pump circuit which generates a gate  
voltage substantially higher than the power supply volt-  
age. The charge pump capacitors are included on chip and  
thereforenoexternalcomponentsarerequiredtogenerate  
the gate drive.  
The LTC1154 input and shutdown input have been de-  
signed to accommodate a wide range of logic families.  
Both input thresholds are set at about 1.3V with approxi-  
mately 100mV of hysteresis.  
A low standby current voltage regulator provides continu-  
ous bias for the TTL-to-CMOS converter. The TTL-to-  
CMOS converter output enables the rest of the circuitry. In  
this way the power consumption is kept to a minimum in  
the standby mode.  
Drain Current Sense  
The LTC1154 is configured to sense the current flowing  
into the drain of the power MOSFET in a high-side applica-  
tion. An internal 100mV reference is compared to the drop  
across a sense resistor (typically 0.002Ω to 0.10Ω) in  
series with the drain lead. If the drop across this resistor  
exceeds the internal 100mV threshold, the input latch is  
reset and the gate is quickly discharged via a large  
N-channel transistor.  
ENABLE Input  
The ENABLE input is CMOS compatible and inhibits the  
input signal whenever it is held logic high. This input  
should be grounded when not in use.  
Internal Voltage Regulation  
Controlled Gate Rise and Fall Times  
The output of the TTL-to-CMOS converter drives two  
regulated supplies which power the low voltage CMOS  
logicandanalogblocks.Theregulatoroutputsareisolated  
from each other so that the noise generated by the charge  
When the input is switched ON and OFF, the gate is  
charged by the internal charge pump and discharged in a  
controlled manner. The charge and discharge rates have  
7
LTC1154  
U
LTC1154 OPERATIO  
been set to minimize RFI and EMI emissions in normal  
operation. If a short-circuit or current overload condition  
is encountered, the gate is discharged very quickly (typi-  
cally a few microseconds) by a large N-channel transistor.  
gate of the MOSFET is driven low by the protection  
circuitry. The status circuitry is reset along with the input  
latch when the input, or ENABLE input, is cycled.  
Status Output Driver  
Thestatuscircuitrycontinuouslymonitorsthefaultdetec-  
tion logic. This open-drain output is driven low when the  
O U  
W
U
PPLICATI  
A
S I FOR ATIO  
stored energy to ground. Many inductive loads have these  
diodes included. If not, a diode of the proper current rating  
should be connected across the load, as shown in Figure  
2, to safely divert the stored energy.  
MOSFET and Load Protection  
The LTC1154 protects the power MOSFET switch by  
removing drive from the gate as soon as an over-current  
conditionisdetected. Resistiveandinductiveloadscanbe  
protected with no external time delay in series with the  
drain sense pin. Lamp loads, however, require that the  
over-current protection by delayed long enough to start  
the lamp but short enough to ensure the safety of the  
MOSFET.  
12V  
+
100µF  
IN  
V
S
0.036Ω  
EN  
DS  
G
LTC1154  
STATUS  
GND  
IRFZ24  
Resistive Loads  
15V  
Loadsthatareprimarilyresistiveshouldbeprotectedwith  
asshortadelayaspossibletominimizetheamountoftime  
that the MOSFET is subjected to an overload condition.  
The drain sense circuitry has a built-in delay of approxi-  
mately 10µs to eliminate false triggering by power supply  
or load transient conditions. This delay is sufficient to  
“mask” short load current transients and the starting of a  
small capacitor (<1µF) in parallel with the load. The drain  
sense pin can therefore be connected directly to the drain  
current sense resistor as shown in Figure 1.  
SD  
R
LOAD  
C
≤ 1µF  
LOAD  
12Ω  
LTC1154 • F01  
Figure 1. Protecting Resistive Loads  
12V  
+
100µF  
IN  
V
S
0.036Ω  
Inductive Loads  
EN  
DS  
G
Loads that are primarily inductive, such as relays, sole-  
noids and stepper motor windings should be protected  
with as short a delay as possible to minimize the amount  
of time that the MOSFET is subjected to an overload  
condition.Thebuilt-in10µsdelaywillensurethattheover-  
current protection is not false-triggered by a supply or  
load transient. No externaldelay components arerequired  
as shown in Figure 2.  
LTC1154  
STATUS  
IRFZ24  
15V  
GND  
SD  
12V, 1A  
SOLENOID  
1N5400  
LTC1154 • F02  
Large inductive loads (>0.1mH) may require diodes con-  
nected directly across the inductor to safely divert the  
Figure 2. Protecting Inductive Loads  
8
LTC1154  
O U  
W
U
PPLICATI  
A
S I FOR ATIO  
Capacitive Loads  
Lamp Loads  
Large capacitive loads, such as complex electrical sys-  
tems with large bypass capacitors, should be powered  
using the circuit shown in Figure 3. The gate drive to the  
power MOSFET is passed through an RC delay network,  
R1 and C1, which greatly reduces the turn-on ramp rate of  
the switch. And since the MOSFET source voltage follows  
the gate voltage, the load is powered smoothly and slowly  
from ground. This dramatically reduces the start-up cur-  
rent flowing into the supply capacitor(s) which, in turn,  
reducessupplytransientsandallowsforsloweractivation  
of sensitive electrical loads. (Diode, D1, provides a direct  
path for the LTC1154 protection circuitry to quickly dis-  
charge the gate in the event of an over-current condition).  
The in-rush current created by a lamp during turn-on can  
be 10 to 20 times greater than the rated operating current.  
The circuit shown in Figure 4 shifts the current limit  
threshold up by a factor of 11:1 (to 30A) for 100ms when  
the bulb is first turned on. The current limit then drops  
down to 2.7A after the in-rush current has subsided.  
12V  
+
470µF  
10k  
0.036Ω  
IN  
V
S
100k  
EN  
DS  
G
VN2222LL  
0.1µF  
LTC1154  
STATUS  
GND  
1M  
SD  
MTP3055EL  
12V  
+
9.1V  
470µF  
IN  
V
S
0.036Ω  
C
R
12V/1A  
BULB  
D
D
0.01µF  
100k  
EN  
DS  
G
D1  
1N4148  
LTC1154  
LTC1154 • F04  
STATUS  
GND  
R
100k  
R
2
Figure 4. Lamp Driver with Delayed Protection  
1
100k  
MTP3055E  
OUT  
SD  
C
1
Selecting RD and CD  
0.33µF  
15V  
Figure 5 is a graph of normalized over-current shutdown  
time versus normalized MOSFET current. This graph is  
used to select the two delay components, RD and CD,  
which make up a simple RC delay between the drain sense  
resistor and the drain sense input.  
+
C
LOAD  
100µF  
LTC1154 • F03  
Figure 3. Powering Large Capacitive Loads  
The RC network, RD and CD, in series with the drain sense  
input should be set to trip based on the expected charac-  
teristics of the load after start-up. With this circuit, it is  
possible to power a large capacitive load and still react  
quickly to an over-current condition. The ramp rate at the  
output of the switch as it lifts off ground is approximately:  
10  
1
dV/dt = (VGATE – VTH)/(R1 × C1)  
0.1  
0.01  
Andthereforethecurrentflowingintothecapacitorduring  
start-up is approximately:  
1
10  
100  
ISTART-UP = CLOAD × dV/dt  
MOSFET CURRENT (1 = SET CURRENT)  
LTC1154 • F05  
Using the values shown in Figure 3, the start-up current is  
less than 100mA and does not false-trigger the drain  
sense circuitry which is set at 2.7A with a 1ms delay.  
Figure 5. Over-Current Shutdown Time vs MOSFET Current  
9
LTC1154  
PPLICATI  
The Y axis of the graph is normalized to one RC time  
constant. The X axis is normalized to the current. (The set  
current is defined as the current required to develop  
100mV across the drain sense resistor).  
O U  
W
U
A
S I FOR ATIO  
12V  
5V  
+
10µF  
120k  
10k  
10k  
10k  
IN  
V
S
0.05Ω  
5V  
µP OR  
CONTROL  
LOGIC  
EN  
DS  
G
Note that the shutdown time is shorter for increasing  
levels of MOSFET current. This ensures that the total  
energy dissipated by the MOSFET is always within the  
bounds established by the manufacturer for safe opera-  
tion. (See MOSFET data sheet for further information).  
LTC1154  
STATUS  
GND  
MTP12N06  
15V  
SD  
LOAD  
10k  
300Ω  
Using a Speed-Up Diode  
LTC1154 • F07  
To reduce the amount of time that the power MOSFET is in  
a short-circuit condition, “bypass” the delay resistor with  
a small signal diode as shown in Figure 6. The diode will  
engage when the drop across the drain sense resistor  
exceeds about 0.7V, providing a direct path to the sense  
pin and dramatically reducing the amount of time the  
Figure 7. Reverse Battery Protection  
Since the LTC1154 draws very little current while in  
normal operation, the drop across the ground resistor is  
minimal. The 5V µP (or control logic) is protected by the  
10k resistors in series with the input and status pins.  
Current Limited Power Supplies  
12V  
+
100µF  
The LTC1154 requires at least 3.5V at the supply pin to  
ensure proper operation. It is therefore necessary that the  
supply to the LTC1154 be held higher than 3.5V at all  
times,evenwhentheoutputoftheswitchisshortcircuited  
toground.Theoutputvoltageofacurrentlimitedregulator  
may drop very quickly during short circuit and pull the  
supply pin of the LTC1154 below 3.5V before the shut-  
down circuitry has had time to respond and remove drive  
from the gate of the power MOSFET. A supply filter should  
1N4148  
IN  
V
S
0.036Ω  
0.01µF  
100k  
EN  
DS  
G
LTC1154  
STATUS  
IRF530  
15V  
GND  
SD  
LOAD  
LTC1154 • F06  
5V/2A  
REGULATOR  
Figure 6. Using a Speed-Up Diode  
>7V  
+
+
*20Ω  
10µF  
0.1Ω  
100µF  
+
1N4148  
100k  
MOSFET is in an overload condition. The drain sense  
resistor value is selected to limit the maximum DC current  
to 2.8A. The diode conducts when the drain current  
exceeds 20A and reduces the turn-off time to 15µs.  
47µF*  
IN  
V
S
0.1µF  
EN  
DS  
G
LTC1154  
IRLR024  
STATUS  
Reverse Battery Protection  
SHORT  
CIRCUIT  
GND  
SD  
The LTC1154 can be protected against reverse battery  
conditions by connecting a resistor in series with the  
ground lead as shown in Figure 7. The resistor limits the  
supply current to less than 50mA with –12V applied.  
LTC1154 • F08  
*SUPPLY FILTER COMPONENTS  
Figure 8. Supply Filter for Current Limited Supplies  
10  
LTC1154  
O U  
W
U
PPLICATI  
A
S I FOR ATIO  
be added as shown in Figure 8 which holds the supply pin  
of the LTC1154 high long enough for the over-current  
shutdown circuitry to respond and fully discharge the  
gate.  
largeoutputcapacitorsonmanyswitchingregulatorsmay  
be able to hold the supply pin of the LTC1154 above 3.5V  
sufficiently long that this extra filtering is not required.  
Because the LTC1154 is micropower in both the standby  
and ON state, the voltage drop across the supply filter is  
less than 2mV, and does not significantly alter the accu-  
racy of the 100mV drain sense threshold voltage.  
Five volt linear regulators with small output capacitors are  
the most difficult to protect as they can “switch” from a  
voltage mode to a current limited mode very quickly. The  
U
O
TYPICAL APPLICATI S  
High-Side Driver with Over-Voltage Shutdown  
High-Side Driver with Thermal Shutdown  
6V  
4.75V TO 5.25V  
5V  
5V  
+
+
100µF  
10µF  
IN  
V
S
IN  
V
S
100Ω  
µP OR  
CONTROL  
LOGIC  
µP OR  
CONTROL  
LOGIC  
EN  
DS  
G
EN  
DS  
G
LTC1154  
LTC1154  
5.6V  
STATUS†  
IRLZ24  
STATUS†  
IRLD024  
30k  
GND  
SD  
GND  
SD  
6V  
LOAD  
PTC  
THERMISTOR  
(100°C)*  
5V  
LOAD  
*RL3006-50-100-25-PT0 KEYSTONE  
SWITCH IS SHUTDOWN WHEN V > 5.7V  
S
LTC1154 • TA03  
LTC1154 • TA05  
†A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.  
High-Side Driver with Under-Voltage Shutdown  
24V to 28V High-Side Switch with Thermal Shutdown  
5V  
24V TO 28V  
+
+
10k  
3k  
100µF  
100µF  
1N4148*  
+
+
1µF**  
5V  
5V  
18V  
10µF  
2N2907  
IN  
V
IN  
V
S
S
µP OR  
CONTROL  
LOGIC  
µP OR  
CONTROL  
LOGIC  
EN  
DS  
G
EN  
DS  
G
LTC1154  
LTC1154  
STATUS†  
IRLZ24  
MTP12N06  
STATUS†  
200k  
GND  
SD  
GND  
SD  
PTC  
THERMISTOR  
(100°C)*  
6V  
LOAD  
24V TO 28V  
LOAD  
10k  
*OPTIONAL IF SUPPLY VOLTAGE LESS THAN 6V.  
*KEYSTONE RL2006-100-100-30-PT.  
MOUNT ON MOSFET OR LOAD HEAT SINK  
**CAPACITOR CHARGED TO SUPPLY VOLTAGE.  
SHUTDOWN OCCURS WHEN SUPPLY VOLTAGE  
DROPS BY 0.6V.  
LTC1154 • TA06  
LTC1154 • TA04  
11  
LTC1154  
U
O
TYPICAL APPLICATI S  
High-Side Relay Driver with Over-Current  
Protection and Status Feedback  
24V to 28V Switch with Bootstrapped Supply  
24V TO 28V  
12V  
+
+
100k  
100µF  
100µF  
2Ω  
0.02Ω  
+
5V  
5V  
18V  
10µF  
10k  
6.2k  
IN  
V
IN  
V
S
S
0.01µF  
1N4148  
µP OR  
CONTROL  
LOGIC  
µP OR  
CONTROL  
LOGIC  
1N4148  
EN  
DS  
G
EN  
DS  
G
MTD3055E  
15V  
LTC1154  
LTC1154  
STATUS†  
MTP15N06E  
STATUS†  
TO 12V  
LOAD  
200k  
GND  
SD  
GND  
SD  
PTC  
THERMISTOR  
(100°C)*  
1N4001  
24V TO 28V  
LOAD  
*KEYSTONE RL2006-100-100-30-PT.  
COIL CURRENT LIMITED TO 350mA.  
CONTACT CURRENT LIMITED TO 5A.  
MOUNT ON MOSFET OR LOAD HEAT SINK.  
LTC1154 • TA07  
LTC1154 • TA08  
I
= 60µA, I  
= 1mA.  
Q(OFF)  
Q(ON)  
†A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.  
“4-Cell-to-5V” Extremely Low Voltage Drop Regulator with  
Over-Current Shutdown, Status Feedback, Ramped Turn-ON  
and 8µA Standby Current  
4-CELL  
BATTERY  
PACK  
+
100µF  
0.036Ω  
5V  
IN  
V
S
µP OR  
CONTROL  
LOGIC  
IRLR024  
1N4148  
100k 100k  
0.22µF  
EN  
DS  
G
200pF  
10k  
LTC1154  
STATUS†  
1
8
3
4
5V/2A  
LT1431  
7
GND  
SD  
+
470µF  
ESR < 0.5Ω  
6
5
LTC1154 • TA09  
12  
LTC1154  
U
O
TYPICAL APPLICATI S  
Bank Controlled High-Side Switches with “Global” Thermal  
and Over-Voltage Shutdown  
12V  
IN  
V
S
+
100Ω  
470µF  
EN  
DS  
G
LTC1154  
STATUS  
IRLR024  
IRLR024  
IRLR024  
IRLR024  
15V  
15V  
15V  
15V  
GND  
SD  
OUTPUT 1  
OUTPUT 2  
OUTPUT 3  
IN  
V
S
5V  
EN  
DS  
G
LTC1154  
51k  
STATUS  
GND  
SD  
µP OR  
CONTROL  
LOGIC  
IN  
V
S
EN  
DS  
G
LTC1154  
STATUS  
GND  
SD  
IN  
V
S
120k  
EN  
DS  
G
LTC1154  
STATUS  
GND  
SD  
OUTPUT 4  
PTC  
THERMISTOR  
(100°C)*  
15V  
*KEYSTONE RL2006-100-100-30-PT.  
MOUNT ON COMMON HEAT SINK.  
LTC1154 • TA10  
13  
LTC1154  
TYPICAL APPLICATI S  
U
O
12V Step-Up Regulator with Ultra-Low Standby Current,  
Over-Current Protection and Status Feedback  
1N5820  
50µH  
0.02Ω  
IRLZ24  
12V/1A  
5V  
+
+
20Ω  
470µF  
330µF  
5
+
10.72k  
1%  
+
10k  
1N4148  
V
47µF  
IN  
150µF  
4
2
V
SW  
ON/OFF  
STATUS  
IN  
V
S
LT1070  
0.22µF  
FB  
1N4148  
100k 100k  
V
GND  
C
1
51k  
EN  
DS  
G
3
1.24k  
1%  
LTC1154  
STATUS  
GND  
1k  
0.1µF  
SD  
1µF  
LTC1154 • TA11  
12V Step-Up Regulator with 1A Over-Current Protection,  
Switch Status Feedback and Ramped Output  
1N5820  
50µH  
5V  
+
+
150µF  
330µF  
0.1Ω  
5
1N4148  
10k  
V
IN  
10.72k  
1%  
4
2
V
SW  
ON/OFF  
IN  
V
S
LT1070  
0.1µF  
FB  
1N4148  
V
C
1
GND  
51k  
EN  
DS  
G
1.24k  
1%  
3
LTC1154  
100k 100k  
STATUS  
STATUS  
GND  
IRF530  
1k  
1µF  
12V  
SD  
12V/1A  
+
0.22µF  
47µF  
LTC1154 • TA12  
14  
LTC1154  
U
O
TYPICAL APPLICATI S  
Auto-Reset High-Side Switch with Over-Current  
and Over-Current Temperature Shutdown  
12V  
+
100µF  
R
T
1M  
1M**  
0.036Ω  
ON/OFF  
IN  
V
S
EN  
DS  
G
LTC1154  
+
C
T
STATUS  
GND  
MTP12N06  
100µF**  
18V  
VN2222LL  
200k  
PTC  
SD  
12V  
LOAD  
THERMISTOR  
(100°C)*  
*KEYSTONE RL2006-100-100-30-PT.  
**AUTO-RESET PERIOD ≈ 800ms WITH COMPONENTS SHOWN  
LTC1154 • TA13  
SCSI Termination Power Switch with 1A Over-Current Shutdown,  
Auto-Reset and Load Soft-Start  
1N5817  
0.1Ω  
MTD3055EL  
4.25V/1A  
5V  
+
+
100µF  
10µF  
1M  
1M  
20Ω  
10k  
1N4148  
+
ON/OFF  
IN  
V
S
47µF  
0.1µF  
1N4148  
100k 100k  
EN  
DS  
G
LTC1154  
+
STATUS  
1µF  
VN2222LL  
0.22µF  
GND  
SD  
LTC1154 • TA14  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.  
15  
LTC1154  
U
PACKAGE DESCRIPTIO  
N8 Package  
8-Lead Plastic Lead  
0.400  
(10.160)  
MAX  
0.130 ± 0.005  
(3.302 ± 0.127)  
0.300 – 0.320  
(7.620 – 8.128)  
0.045 – 0.065  
(1.143 – 1.651)  
8
1
7
6
5
4
0.065  
(1.651)  
TYP  
0.250 ± 0.010  
(6.350 ± 0.254)  
0.009 – 0.015  
(0.229 – 0.381)  
0.125  
(3.175)  
MIN  
0.020  
(0.508)  
MIN  
+0.025  
–0.015  
0.045 ± 0.015  
(1.143 ± 0.381)  
0.325  
2
3
+0.635  
8.255  
(
)
–0.381  
0.100 ± 0.010  
(2.540 ± 0.254)  
0.018 ± 0.003  
(0.457 ± 0.076)  
S8 Package  
8-Lead Plastic SOIC  
0.189 – 0.197  
0.010 – 0.020  
(0.254 – 0.508)  
(4.801 – 5.004)  
× 45°  
0.053 – 0.069  
(1.346 – 1.752)  
7
5
8
6
0.004 – 0.010  
(0.101 – 0.254)  
0.008 – 0.010  
(0.203 – 0.254)  
0.016 – 0.050  
0.406 – 1.270  
0.050  
(1.270)  
BSC  
0.014 – 0.019  
(0.355 – 0.483)  
0.228 – 0.244  
(5.791 – 6.197)  
0.150 – 0.157  
(3.810 – 3.988)  
0°– 8°  
TYP  
1
3
4
2
LT/GP 1192 10K REV 0  
Linear Technology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7487  
16  
●
●
LINEAR TECHNOLOGY CORPORATION 1992  
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977  

相关型号：

SI9130DB

 5- and 3.3-V Step-Down Synchronous Converters

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9135LG-T1

 SMBus Multi-Output Power-Supply Controller

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9135LG-T1-E3

 SMBus Multi-Output Power-Supply Controller

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9135_11

 SMBus Multi-Output Power-Supply Controller

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9136_11

 Multi-Output Power-Supply Controller

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9130CG-T1-E3

 Pin-Programmable Dual Controller - Portable PCs

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9130LG-T1-E3

 Pin-Programmable Dual Controller - Portable PCs

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9130_11

 Pin-Programmable Dual Controller - Portable PCs

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9137

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9137DB

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9137LG

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY

SI9122E

 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

Warning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明