LT3587 데이터 시트보기 (PDF) - Linear Technology

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LT3587

High Voltage Monolithic Inverter and Dual Boost

Linear Technology 

LT3587

TYPICAL PERFORMANCE CHARACTERISTICS Specifications are at TA = 25°C unless otherwise noted.

EN/SS1, EN/SS3 Shutdown

Threshold vs Temperature

0.45

VVIN = 3.6V

0.40

0.35

0.30

0.25

CAP3 Overvoltage Clamp

vs Temperature

31

VVIN = 3.6V

30

29

28

0.20

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3587 G17

27

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3587 G18

PIN FUNCTIONS

VOUT3 (Pin 1): Boost3 Output Pin. This pin is the drain of

an output disconnect PMOS transistor.

CAP3 (Pin 2): Boost3 Output Capacitor Pin. This pin is the

source of an output PMOS disconnect. Connect a capacitor

from this pin to ground.

SW3 (Pin 3): Boost3 Switch Pin. Connect an inductor

from this pin to VIN. Minimize trace area at this pin to

minimize EMI.

GND (Pin 4, 7, 8, 12): Ground Pins.

FLT (Pin 5): Fault Pin. This pin is a bidirectional open-

drain pull-down pin. This pin pulls low when any of the

enabled outputs fall out of regulation for more than 16ms.

Each output is ignored during start-up until its respective

enable/soft-start pin allows for full inductor current. This

pin can also be externally forced low to disable all the

supply outputs. Once this pin goes low (either due to an

out of regulation condition or externally forced low), the

pin latches low until the inputs to EN/SS1 and EN/SS3 are

set low or the input supply pin is recycled. Pull up this pin

to VIN with a 200k resistor when not used.

FB2 (Pin 6): Inverter Output Voltage Feedback Pin. Con-

nect a resistor RFB2 from this pin to the Inverter Output

(VNEG) such that:

RFB2 = |VNEG|/8μA

Note that FB2 pin voltage is about 0V when in regulation.

There is an internal 153k resistor from the FB2 pin to the

internal reference.

SW2 (Pin 9): Inverter Switch Pin. Connect an inductor

between this pin and VIN, as well as the flying capacitor

from this pin to the anode of the lnverter ground return

diode. Minimize trace area at this pin to minimize EMI.

NC (Pin 10): No Connect Pin. Leave open or connect to

ground.

SW1 (Pin 11): Boost1 Switch Pin. Connect an inductor

from this pin to VIN. Minimize trace area at this pin to

minimize EMI.

CAP1 (Pin 13): Boost1 Output Capacitor Pin. This pin

is the source of an output PMOS disconnect. Connect a

capacitor from this pin to ground.

3587fc

6

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