Rainbow-electronics MAX8625A Manual de usuario descargar pdf (Pagina 6)

MAX8625A

High-Efficiency, Seamless Transition,

Step-Up/Down DC-DC Converter

6 _______________________________________________________________________________________

2ms/div

STARTUP WAVEFORMS

= 3.6V, LOAD = 5Ω, V

OUT

= 3.288V

MAX8625A toc16

SHDN

2V/div

OUT

20mV/div

BATT

500mA/div

2ms/div

STARTUP WAVEFORMS (FIGURE 3)

= 3.6V, LOAD = 30Ω, V

OUT

= 1.5V

MAX8625A toc17

SHDN

2V/div

BATT

100mA/div

OUT

500mA/div

400

μs/div

LOAD TRANSIENT

OUT

= 3.3V

MAX8625A toc18

OUT

100mV/div

(DC OFFSET = 3.3V)

500mA/div

BATT

250mA/div

Typical Operating Characteristics (continued)

= 3.6V, SKIP = GND, T

= +25°C, Figure 4, unless otherwise noted.)

1ms/div

LINE TRANSIENT

OUT

= 3.3V, LOAD = 5.5Ω,

RAMP 3V TO 4V

MAX8625A toc19

CH1 = V

500mV/div

3V OFFSET

CH2 = V

OUT

50mV/div

(AC-COUPLED)

BODE PLOT

GAIN AND PHASE vs. FREQUENCY

MAX8625A toc20

FREQUENCY (kHz)

GAIN (dB)

10010

-50

-40

-30

-20

-10

-60

1 1000

= 3.6

OUT

= 3.3V

LOAD = 200mA

-180

-144

-108

-72

-36

108

144

180

PHASE (DEG)

GAIN

PHASE

0.90

0.94

0.92

0.98

0.96

1.04

1.02

1.00

1.06

-40 0-20 20 40 60 80 100

OSCILLATOR FREQUENCY

vs. TEMPERATURE

MAX8625A toc21

TEMPERATURE (°C)

OSCILLATOR FREQUENCY (MHz)

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Rainbow-electronics MAX8625A Manual de usuario Pagina 6

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