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PDF LTC1156 Data sheet ( Hoja de datos )
| Número de pieza | LTC1156 | |
| Descripción | Quad High Side Micropower MOSFET Driver with Internal Charge Pump | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s No External Charge Pump Components
s Fully Enhances N-Channel Power MOSFETs
s 16 Microamps Standby Current
s 95 Microamps ON Current
s Wide Power Supply Range 4.5V to 18V
s Controlled Switching ON and OFF Times
s Replaces P-Channel High Side Switches
s Compatible with Standard Logic Families
s Available in 16-pin SOL Package
APPLICATI S
s Laptop Computer Power Switching
s SCSI Termination Power Switching
s Cellular Telephone Power Management
s P-Channel Switch Replacement
s Battery Charging and Management
s Low Frequency H-Bridge Driver
s Stepper Motor and DC Motor Control
LTC1156
Quad High Side
Micropower MOSFET Driver
with Internal Charge Pump
DESCRIPTIO
The LTC1156 quad 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 opera-
tion, with 16µA standby current and 95µA operating
current, allows use in virtually all systems with maximum
efficiency.
Included on chip is independent over-current sensing to
provide automatic shutdown in case of short circuits. A
time delay can be added to the current sense to prevent
false triggering on high in-rush current loads.
The LTC1156 operates off of a 4.5V to 18V supply and is
well suited for battery-powered applications, particularly
where micropower “sleep” operation is required.
The LTC1156 is available in both 16-pin DIP and 16-pin
SOL packages.
TYPICAL APPLICATI
Laptop Computer Power Management
5V
+
5V
CONTROL
LOGIC
OR µP
10µF
VS VS DS1
DS2
DS3
DS4
LTC1156
IN1
IN2
IN3
IN4
GND GND
G1
G2
G3
G4
0.1µF
100k
Si9956DY
Si9956DY
ALL COMPONENTS SHOWN ARE SURFACE MOUNT. MINIMUM PARTS COUNT
SHOWN. CURRENT LIMITS CAN BE SET SEPARATELY AND TAILORED TO
INDIVIDUAL LOAD CHARACTERISTICS.
* IMS026 INTERNATIONAL MANUFACTURING SERVICES, INC. (401) 683-9700
*30mΩ
HARD DISK
DRIVE
FLOPPY DISK
DRIVE
DISPLAY
PERIPHERAL
1156 TA01
Standby Supply Current
100
90 VIN1 = VIN2 = VIN3 = VIN4 = 0V
TJ = 25°C
80
70
60
50
40
30
20
10
0
0 5 10 15 20
SUPPLY VOLTAGE (V)
LTC1156 G01
1
1 page  
LTC1156
OPERATIO
A voltage regulator with low standby current provides
continuous bias for the TTL to CMOS converters. 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.
Internal Voltage Regulation
The output of the TTL to CMOS converter drives two
regulated supplies which power the low voltage CMOS
logic and analog blocks. The regulator outputs are isolated
from each other so that the noise generated by the charge
pump logic is not coupled into the 100mV reference or the
analog comparator.
Gate Charge Pump
Gate drive for the power MOSFET 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
therefore no external components are required to generate
the gate drive.
Drain Current Sense
The LTC1156 is configured to sense the drain current of
the power MOSFET in high side applications. An internal
100mV reference is compared to the drop across a sense
resistor (typically 0.002Ω to 0.1Ω) 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 by a large N-channel transistor. A
simple RC network can be added to delay the over-current
protection so that large in-rush current loads such as
lamps or capacitors can be started.
Supply and Ground Pins
The two supply pins (3 and 8) of the LTC1156 must be
connected together at all times and the two ground pins (1
and 6) must be connected together at all times. The two
supply pins should be connected to the “top” of the drain
current sense resistor/s to ensure accurate sensing.
For further applications information, see the LTC1155
Dual High Side Micropower MOSFET Driver data sheet.
TYPICAL APPLICATI S
4-Cell Extremely Low Voltage Drop Regulator and Three Load
Switches with Short-Circuit Protection and 20µA Standby Current
5.2V TO 6V
4-CELL NiCd
BATTERY PACK
+
+
47µF
DS2 VS VS DS1
DS3
DS4 G1
CONTROL
LOGIC
REG ON/OFF
FAULT
IN1 LTC1156
IN2
IN3
IN4
GND GND
G2
G3
G4
0.1µF
100k
**0.03Ω
3.3A MAX
100k
0.1µF
IRLR024
200pF
5V/2A
SWITCHED
2 × Si9956DY
1N4148
10k
* CAPACITOR ESR LESS THAN 0.5Ω
** RCS02 ULTRONIX (303) 242-0810
1
83
7 LT1431 4
65
5V 5V 5V
LOAD LOAD LOAD
+
*470µF
1156 TA02
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1156.PDF ] | |
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