TPS2104, TPS2105

SLVS235A – SEPTEMBER 1999 – REVISED APRIL 2000

12

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

Figure 17

280

240

200

–40

–10

20

50

320

IN1-OUT ON-STATE RESISTANCE

vs

JUNCTION TEMPERATURE

360

80

110

140

TJ – Junction Temperature – °C

VI(IN1) = 2.7 V

VI(IN1) = 3.3 V

VI(IN1) = 4 V

VI(IN1) = 5 V

VI(IN1) = 5.5 V

Figure 18

1.5

1

0.5

–40

–10

20

50

2

2.5

IN2-OUT ON-STATE RESISTANCE

vs

JUNCTION TEMPERATURE

3

80

110

140

VI(IN2) = 3.3 V

VI(IN2) = 2.7 V

TJ – Junction Temperature – °C

VI(IN2) = 5.5 V

VI(IN2) = 5 V

VI(IN2) = 4 V

APPLICATION INFORMATION

EN

IN1

IN2

OUT

GND

5 V VAUX

5 V VCC

CardBus or System Controller

TPS2104

0.22

µF

0.22

µF

1

µF

xx

µF

5 V

Figure 19. Typical Application

power-supply considerations

A 0.22-

µF ceramic bypass capacitor between IN and GND, close to the device is recommended. The output

capacitor should be chosen based on the size of the load during the transition of the switch. A 220-

µF capacitor

is recommended for 100-mA loads. Typical output capacitors (xx

µF, shown in Figure 19) required for a given

load can be determined from Figure 11 which shows the output voltage droop when output is switched from IN2

to IN1. The output voltage droop is insignificant when output is switched from IN1 to IN2. Additionally, bypassing

the output with a 1-

µF ceramic capacitor improves the immunity of the device to short-circuit transients.