Rainbow-electronics MAX1688 Manual do Utilizador descarregar pdf (Página 4)

MAX1687/MAX1688

Step-Up DC-DC Converters with Precise,

Adaptive Current Limit for GSM

4 _______________________________________________________________________________________

_____________________________

Typical Operating Characteristics (continued)

= +3.3V, V

OUT

= 5V, V

LIM

= 1V, Figures 6b and 7, T

= +25°C, unless otherwise noted.)

300

450

400

350

500

550

600

650

700

750

800

100 200150 250 300 350 400

MAX1688

PEAK

vs. V

OUT

DROOP

MAX1687/88 toc09

OUT

DROOP (mV)

PEAK

(mA)

CHG

= 40.2k

800

700

600

500

400

300

200

100

15 20 25 30 35 40

MAX1688 PEAK INDUCTOR CURRENT

vs. R

CHG

(1A GSM LOAD)

MAX1687/88 toc10

CHG

(kΩ)

PEAK INDUCTOR CURRENT (mA)

100

200

300

400

500

600

700

800

15 20 25 30 35 40

MAX1688 PEAK BATTERY CURRENT

vs. R

CHG

(1A GSM LOAD)

MAX1687/88 toc04

CHG

(kΩ)

PEAK BATTERY CURRENT (mA)

1.5

2.5

2.0

3.5

3.0

4.0

4.5

-40 20 40-20 0 60 80 100

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

NO-LOAD BATTERY INPUT CURRENT vs.

TEMPERATURE (V

OUT

= 5V, V

LIM

= 1V )

MAX1687/88 toc05

= 5V

= 3.3V

= 2.7V

= 6V

REFERENCE VOLTAGE vs. REFERENCE

CURRENT (V

= 3.3V, V

OUT

= 5V)

MAX1687/88 toc06

REF

(µA)

REF

(V)

1.245

1.200

1 100010010

1.215

1.205

1.235

1.225

1.250

1.220

1.210

1.240

1.230

1.245

1.247

1.249

1.251

1.253

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

-40 20 40-20 0 60 80 100

REFERENCE VOLTAGE vs. TEMPERATURE

= 3.3V, V

OUT

= 5V)

MAX1687/88 toc07

1200

1 10 100

SWITCHING FREQUENCY vs. INDUCTANCE

= 3.3V, V

OUT

= 5V,

LOAD

= 100mA, V

LIM

= 1V)

200

MAX1687/88 toc08

INDUCTANCE (µH)

FREQUENCY (kHz)

600

400

1000

800

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

/MAX1688 1
MAX1687/MAX1688 10

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