MAX849 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX849

1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters

Maxim Integrated 

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

Low-Noise, Step-Up DC-DC Converters

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

MAX849

GSM LOAD-TRANSIENT RESPONSE

MAX848/9 TOC-14

MAX849

DECT LOAD-TRANSIENT RESPONSE

MAX848/9 TOC-15

5V

3.3V

A

A

B

B

0A

0A

1ms/div

VIN = 3.6V, VOUT = 5V, COUT = 440µF

A = VOUT RIPPLE, 200mV/div, AC COUPLED

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

PULSE WIDTH = 577µs

2.7

2ms/div

VIN = 1.2V, VOUT = 3.3V, COUT = 440µF

A = VOUT RIPPLE, 200mV/div, AC COUPLED

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

PULSE WIDTH = 416µs

MAX849 NOISE SPECTRUM

(VOUT = 3.3V, VIN = 1.2V, RLOAD = 50Ω)

0

0.1k

1k

MAX849 INTERNAL OSCILLATOR

FREQUENCY vs. TEMPERATURE

380

360

340

VOUT = 5V

320

VOUT = 3.3V

300

280

-40 -20

0 20 40 60

TEMPERATURE (°C)

80 100

10k

FREQUENCY (Hz)

100k

1M

MAX849 PEAK INDUCTOR CURRENT

vs. OUTPUT VOLTAGE

2.0

1.8

1.7

1.6

1.5

1.4

1.3

1.2

2.5 3.0 3.5 4.0 4.5 5.0 5.5

OUTPUT VOLTAGE (V)

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