TPS2306

DUAL SEQUENCING HOT SWAP POWER MANAGER

SLVS368 − APRIL 2001

11

POST OFFICE BOX 655303

APPLICATION INFORMATION

fault output logic

The FAULT signal is an open-drain output which is high-impedance under any conditions which cause the

outputs to be switched off, including an overcurrent or fault time-out on either supply, removal of the external

enable signal with subsequent GATEx ramp-down, or an undervoltage condition on either supply input. Refer

to the Application Information section for additional details on using this output.

The circuit diagram of Figure 2 shows a dual hot-swap application in which the TPS2306 is used to hot swap

and sequence 5.0-V and 3.3-V supplies. The total input bulk and filter capacitance associated with the +5.0V

UDG−01002

IL2

IMAX1

1

UP1

2

ENBL

3

IREF

4

CT

5

GND

6

UP2

7

IMAX2

8

VCC/CS1

16

DOWN1

15

GATE1

14

FAULT

13

CPUMP

12

GATE2

11

DOWN2

10

CS2

9

C2

0.1 µF

TPS2306

D2

C1

0.1

µF

D1

R1B

3.57 k

Ω

R1A

10 k

Ω

Q1

C3

0.01

µF

Q2

R2A

10 k

Ω

R2B

12.1 k

Ω

3.3 V OUT

CLOAD2

LOAD 2

IL1

CLOAD1

LOAD 1

5V_OUT

VCC

R SNS1

0.04 Ω

CSS1

UP1

RIMAX1

365

Ω

R1

10 k

Ω

R IMAX2

274

Ω

CSS2

0.12

µF

RSNS2 0.01Ω

RUP2

1 k

Ω

CT 0.1 µF

RREF 15 kΩ

3.3V_IN

5V_IN

0.33

µ F

UP1

Figure 2. TPS2306 in a 5-V/3.3-V Dual Hot Swap Application