Rainbow-electronics MAX1639 Manual de usuario descargar pdf (Pagina 4)

MAX1639

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

4 _______________________________________________________________________________________

FOLDBACK CURRENT LIMIT

OUT

= 2.5V, NOMINAL)

MAX1639-02

A: V

OUT

= 0.5V/div

B: INDUCTOR CURRENT, 5A/div

10µs/div

START-UP WAVEFORMS

MAX1639-03

A: INDUCTOR CURRENT, 2A/div

B: V

OUT

= 1V/div

400µs/div

1µs/div

SWITCHING WAVEFORMS

MAX1639-04

= 5V, V

OUT

= 2.5V, LOAD = 0A

A: V

OUT

, 20mV/div

B: INDUCTOR CURRENT, 2A/div

C: LX, 5V/div

LOAD-TRANSIENT RESPONSE

OUT

= 2.5V)

MAX1639-01

= 5V, V

OUT

= 2.5V, LOAD = 8A

A: V

OUT

, 100mV/div, AC COUPLED

B: INDUCTOR CURRENT, 5A/div

10µs/div

__________________________________________Typical Operating Characteristics

= +25°C, using the MAX1639 evaluation kit, unless otherwise noted.)

100

0.1 10

EFFICIENCY vs. OUTPUT CURRENT

MAX1639-05

OUTPUT CURRENT (A)

EFFICIENCY (%)

3.5V

1.8V

2.5V

MAXIMUM DUTY CYCLE vs.

SWITCHING FREQUENCY

MAX1639-06

SWITCHING FREQUENCY (kHz)

MAXIMUM DUTY CYCLE (%)

200 800 1000 1200

100

600400

1 2 3 4 5 6 7 8 9 ... 12 13

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Rainbow-electronics MAX1639 Manual de usuario Pagina 4

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