LTC1696HS6 データシートの表示（PDF） - Linear Technology

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LTC1696HS6

Overvoltage Protection Controller

Linear Technology 

LTC1696

APPLICATIONS INFORMATION

Back-to-Back N-Channel MOSFET

A power management circuit that uses the LTC1696 to

control ­external back-to-back N-channel MOSFET at low

supply voltage is shown in Figure 3. In standby mode, the

drain of the external N-channel MOSFET, Q1, is pulled high

by the power management controller when the LTC1696

OUT pin is in the low state. The LTC1696 drives the gate

of Q1 high during an overvoltage fault condition. This

pulls the drain of Q1 low and turns off the back-to-back

N-channel MOSFETs.

R2

38.3k

1%

1.5V

R1

44.2k

1%

1

FB1

TIMER/ 6

RESET

LTC1696

2

GND

5

FB2

VCC

3.3V

3

VCC

4

OUT

C2

0.1µF

C1

Q2

1nF 2N7002

RESET

1.8V

R3 R4

44.2k 54.9k

1% 1%

PRIMARY

INPUT

SUPPLY

POWER MANAGEMENT

CONTOLLER

N-CHANNEL

×2

Q1

2N7002

1696 F03

Figure 3. Back-to-Back N-Channel MOSFETs for Low Supply Application

For more information www.linear.com/LTC1696

1696fb

11

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