High-Efficiency PWM, Step-Down

P-Channel DC-DC Controller

4

_______________________________________________________________________________________

a

CONTINUOUS-CONDUCTION MODE WAVEFORMS

c

5

µs/div

b

a) EXT VOLTAGE, 10V/div

b) INDUCTOR CURRENT, 1A/div

a

DISCONTINUOUS-CONDUCTION IDLE-MODE WAVEFORMS

c

20

µs/div

b

a) EXT VOLTAGE, 10V/div

b) INDUCTOR CURRENT, 200mA/div

____________________________Typical Operating Characteristics (continued)

a

LINE-TRANSIENT RESPONSE

5ms/div

b

a) V+ = 6V to 12V, 5V/div

a

LOAD-TRANSIENT RESPONSE

100µs/div

b

a) LOAD CURRENT, 0.1A TO 2.5A, 1A/div

a

MODERATE LOAD, IDLE-MODE WAVEFORMS

c

5

µs/div

b

a) EXT VOLTAGE, 5V/div

b) INDUCTOR CURRENT, 0.5A/div