LTC1156 查看數據表（PDF） - Linear Technology

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LTC1156

Quad High Side Micropower MOSFET Driver with Internal Charge Pump

Linear Technology 

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 IN1 LTC1156

IN2

G2

IN3

G3

FAULT

IN4

G4

GND GND

0.1µF

100k

**0.03Ω

3.3A MAX

100k

0.1µF

IRLR024

200pF

5V/2A

SWITCHED

2 × Si9956DY

10k

1N4148

* CAPACITOR ESR LESS THAN 0.5Ω

** RCS02 ULTRONIX (303) 242-0810

1

8

3

7 LT1431 4

65

5V 5V 5V

LOAD LOAD LOAD

+

*470µF

1156 TA02

5

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