Rainbow-electronics MAX8508 Manual do Utilizador descarregar pdf (Página 4)

MAX8506/MAX8507/MAX8508

PWM Step-Down DC-DC Converters with 75m

Ω

Bypass FET for WCDMA and cdmaOne Handsets

4 _______________________________________________________________________________________

Typical Operating Characteristics

BATT

= V

BATTP

= 3.6V, SHDN = SKIP = BATT, HP = GND, T

= +25°C, unless otherwise noted.) (See the Typical Application Circuits.)

EFFICIENCY vs. OUTPUT VOLTAGE

IN NORMAL MODE

MAX8506 toc01

OUTPUT VOLTAGE (V)

EFFICIENCY (%)

3.02.52.01.51.00.5

100

03.5

LOAD

= 15Ω

LOAD

= 10Ω

LOAD

= 5Ω

SKIP = GND

EFFICIENCY vs. OUTPUT VOLTAGE

IN PWM MODE

MAX8506 toc02

OUTPUT VOLTAGE (V)

EFFICIENCY (%)

3.02.52.01.51.00.5

100

03.5

LOAD

= 15Ω

LOAD

= 10Ω

LOAD

= 5Ω

EFFICIENCY vs. INPUT VOLTAGE

5.04.54.03.53.02.5 5.5

MAX8506 toc03

INPUT VOLTAGE (V)

EFFICIENCY (%)

100

OUT

= 0.4V

OUT

= 1.2V

OUT

= 3.4V

SKIP = GND

LOAD

= 10Ω

LOAD CURRENT (mA)

100101 1000

EFFICIENCY vs. LOAD CURRENT

MAX8506 toc04

EFFICIENCY (%)

100

OUT

= 2.5V;

NORMAL MODE

OUT

= 2.5V;

PWM

OUT

= 1.2V;

NORMAL MODE

OUT

= 1.2V;

PWM

DROPOUT VOLTAGE vs. LOAD CURRENT

MAX8506 toc05

LOAD CURRENT (mA)

OUTPUT VOLTAGE (mV)

15001000500

120

150

0 2000

= 3.6V

HP = BATT

SUPPLY CURRENT vs. SUPPLY VOLTAGE

IN PWM MODE

MAX8506 toc06

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

5.04.54.03.53.02.5

2.0 5.5

OUT

= 1.2V

OUT

= 0.4V

200

300

400

500

600

700

800

900

1000

100

SUPPLY CURRENT vs. SUPPLY VOLTAGE

IN NORMAL MODE

MAX8506 toc07

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.54.03.53.02.52.0 5.5

OUT

= 1.2V

OUT

= 3.4V

OUT

= 0.4V

SKIP = GND

HEAVY-LOAD SWITCHING WAVEFORM

MAX8506 toc08

1µs/div

2V/div

OUT

AC-COUPLED

20mV/div

OUT

= 1.2V

LOAD = 10Ω

1 2 3 4 5 6 7 8 9 10 11

MAX8506/MAX8507/MAX8508 1

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