3.3V, Step-Down,

Current-Mode PWM DC-DC Converters

_______________________________________________________________________________________

5

_________________________________Typical Operating Characteristics (continued)

SWITCHING WAVEFORMS,

CONTINUOUS CONDUCTION

2

µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +6V

B: INDUCTOR CURRENT, 200mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

V+ = 6V, IOUT = 250mA

6V

0V

400mA

0mA

A

B

B

C

SWITCHING WAVEFORMS,

DISCONTINUOUS CONDUCTION

2

µs/div

A: SWITCH VOLTAGE (LX PIN), 5V/div, 0V TO +6V

B: INDUCTOR CURRENT, 100mA/div

C: OUTPUT VOLTAGE RIPPLE, 50mV/div

V+ = 6V, IOUT = 75mA

6V

0V

200mA

0mA

A

C

LINE-TRANSIENT RESPONSE

5ms/div

A: VOUT, 50mV/div

B: V+, 5V/div, 7.0V TO 10.0V

IOUT = 350mA

10V

7V

0V

B

A

LOAD-TRANSIENT RESPONSE

5ms/div

A: VOUT, 50mV/div

B: IOUT, 200mA/div, 0mA TO 500mA

V+ = 6V

500mA

0mA

B

A

Note 2: Operation beyond the specifications listed in the

Electrical Characteristics may exceed the power dissipation ratings of

the device.

Note 3: Wide temperature range circuit of Figure 5 using Sprague surface-mount capacitors.

Note 4: Standby current includes all external component leakage currents. Capacitor leakage currents dominate at TA = +85°C.