4.5V to 28V Input, Synchronous PWM Buck Controllers

for DDR Termination and Point-of-Load Applications

10

______________________________________________________________________________________

Typical Operating Characteristics (continued)

°C, unless otherwise noted.)

POWER-UP WAVEFORMS WITH 20A LOAD

(CIRCUIT OF FIGURE 1)

MAX8553/4 toc14

2ms/div

10A/div

10V/div

0

1V/div

5V/div

POWER-DOWN WAVEFORMS WITH 20A LOAD

(CIRCUIT OF FIGURE 1)

MAX8553/4 toc15

1ms/div

10A/div

10V/div

0

1V/div

5V/div

STARTUP/SHUTDOWN WAVEFORMS WITH

20A LOAD (CIRCUIT OF FIGURE 1)

MAX8553/4 toc16

2ms/div

2A/div

5V/div

0

1V/div

5V/div

SHORT CIRCUIT AND RECOVERY

(CIRCUIT OF FIGURE 1)

MAX8553/4 toc17

200

µs/div

20V/div

5A/div

1V/div

0V

0A