Rainbow-electronics MAX849 Manual de usuario descargar pdf (Pagina 7)

MAX848/MAX849

1-Cell to 3-Cell, High-Power,

Low-Noise, Step-Up DC-DC Converters

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

= 3.6V, V

OUT

= 5V, C

OUT

= 440µF

A = V

OUT

RIPPLE, 200mV/div, AC COUPLED

B = LOAD CURRENT, 100mA TO 1A, 0.5A/div,

PULSE WIDTH = 577µs

MAX849

GSM LOAD-TRANSIENT RESPONSE

1ms/div

MAX848/9 TOC-14

= 1.2V, V

OUT

= 3.3V, C

OUT

= 440µF

A = V

OUT

RIPPLE, 200mV/div, AC COUPLED

B = LOAD CURRENT, 50mA TO 400mA, 0.2A/div,

PULSE WIDTH = 416µs

MAX849

DECT LOAD-TRANSIENT RESPONSE

3.3V

2ms/div

MAX848/9 TOC-15

2.7

0.1k 1k 10k 100k 1M

MAX849 NOISE SPECTRUM

OUT

= 3.3V, V

= 1.2V, R

LOAD

= 50Ω)

MAX848/9 TOC-16

FREQUENCY (Hz)

NOISE (mV

RMS

)

380

280

-40 100

MAX849 INTERNAL OSCILLATOR

FREQUENCY vs. TEMPERATURE

360

MAX848/9 TOC-17

TEMPERATURE (°C)

INTERNAL OSC. FREQUENCY (kHz)

320

300

-20 0 60

340

OUT

= 5V

OUT

= 3.3V

1.2

2.5 3.53.0 4.0 5.55.0

MAX849 PEAK INDUCTOR CURRENT

vs. OUTPUT VOLTAGE

1.4

1.8

2.0

MAX848/9 TOC-18

OUTPUT VOLTAGE (V)

PEAK INDUCTOR CURRENT (A)

4.5

1.6

1.3

1.7

1.5

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Rainbow-electronics MAX849 Manual de usuario Pagina 7

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