Rainbow-electronics MAX1821 Instrukcja Użytkownika Pobierz pdf (Strona 7)

MAX1820/MAX1821

WCDMA Cellular Phone 600mA

Buck Regulators

_______________________________________________________________________________________ 7

MAX1820/21 toc13

2µs/div

A: V

, 5V/div

B: INDUCTOR CURRENT, 500mA/div

C: V

OUT

(AC-COUPLED), 20mV/div

LIGHT-LOAD SKIP-SWITCHING WAVEFORMS

= 4.2V, V

OUT

= 1.5V,

LOAD = 30mA, SKIP = GND)

MAX1820/21 toc14

2ms/div

EXITING AND ENTERING SHUTDOWN

= 3.6V, V

OUT

= 3.4V, R

LOAD

= 15Ω)

OUT

2V/div

BATT

0.5A/div

SHDN

5V/div

MAX1820/21 toc15

40µs/div

LOAD TRANSIENT (I

LOAD

= 20mA TO 420mA,

OUT

= 1.5V, V

= 3.6V, SKIP = BATT)

OUT

200mA/div

OUT

AC-COUPLED

100mV/div

OUT

= 10µF

MAX1820/21 toc16

40µs/div

LOAD TRANSIENT (I

LOAD

= 20mA TO 420mA,

OUT

= 1.5V, V

= 3.6V, SKIP = GND)

OUT

200mA/div

OUT

AC-COUPLED

100mV/div

OUT

= 10µF

MAX1820/21 toc17

20µs/div

MAX1820

REF TRANSIENT (V

REF

= 0.23V TO 1.932V,

LOAD

= 10Ω, V

= 3.6V, SKIP = BATT)

REF

1V/div

OUT

1V/div

MAX1820/21 toc18

40µs/div

LINE TRANSIENT (V

= 3.6V TO 4.0V,

OUT

= 1.5V, I

LOAD

= 300mA)

200mV/div

OUT

AC-COUPLED

20mV/div

OUT

= 10µF

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10 11 12 ... 17 18

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