Rainbow-electronics MAX1688 Instrukcja Użytkownika Pobierz pdf (Strona 5)

MAX1687/MAX1688

Step-Up DC-DC Converters with

Precise, Adaptive Current Limit for GSM

_______________________________________________________________________________________

Typical Operating Characteristics (continued)

= +3.3V, V

OUT

= 5V, V

LIM

= 1V, Figures 6b and 7, T

= +25°C, unless otherwise noted.)

500mA/div

200mV/div

OUT

1ms/div

LOAD

MAX1688

SWITCHING WAVEFORMS

(GSM PULSED LOAD 1A, R

CHG

= 40.2kΩ)

MAX1687/88 toc11

CHL

= 40.2kΩ, L = 10µH

200mA/div

LIM = 1V

LIM

= 0

2µs/div

INDUCTOR CURRENT

MAX1687/88 toc13

200mA/div

1V/div

BATTERY

10µs/div

MAX1687/88 toc15

vs. BATTERY CURRENT

2V/div

1V/div

OUT

5ms/div

MAX1687/88 toc14

POWER-UP WAVEFORM

LOAD

= 15Ω C

OUT

= 2000µF)

500mA/div

200mV/div

OUT

1ms/div

LOAD

MAX1688

SWITCHING WAVEFORMS

(GSM PULSED LOAD 1A, R

CHG

= 18kΩ)

MAX1687/88 toc12

CHG

= 18kΩ, L = 10µH

500mA/div

100mV/div

OUT

500µs/div

SWITCHING WAVEFORMS

(FIXED I

LOAD

= 300mA)

MAX1687/88 toc10a

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

/MAX1688 1
MAX1687/MAX1688 10

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