13

LTC4350

4350fa

150Ω. This value guarantees the zero is at or above the

crossover frequency.

Table 1

5µs

70kHz

0.1µF

10µs

35kHz

0.22µF

20µs

17.5kHz

0.47µF

40µs

8.8kHz

1µF

60µs

5.8kHz

1.5µF

80µs

4.4kHz

2.2µF

100µs

3.5kHz

2.7µF

150µs

2.3kHz

3.3µF

200µs

1.8kHz

4.7µF

300µs

1.2kHz

6.8µF

400µs

0.9kHz

10µF

500µs

0.7kHz

12µF

OTHER APPLICATIONS

The application shown on the first page of this data sheet

assumes that the power supplies and the load reside on

one main board. If the system is a true N + 1 hot swappable

APPLICATIO S I FOR ATIO

power supply, then the LTC4350 will reside with the power

supply on a daughter card that plugs into the main board.

In this case, the input and output capacitors need to be hot

swapped (see Figure 7). The output capacitors are Hot

Swap protected by the LTC4350. The input capacitors are

Hot Swap protected using the LT

parts are described in Table 2.

Table 2

VOLTAGE RANGE

PART NUMBER

3.3V to 12V

LTC1422 Single Channel

LTC1645 Dual Chanel

3.3V to 15V

LTC1642 Overvoltage Protection

2.7V to 16.5V

LTC1647 Dual Channel

9V to 80V

LT1641 Positive High Voltage

– 20V to – 80V

LT4250 Negative High Voltage

In some cases, the output voltage is below the undervoltage

lockout of the LTC4350. In this case, an external supply of

3.3V or greater needs to provide for the chip. Figure 8

shows a 1.5V output redundant power supply that uses