Rainbow-electronics MAX8884Z Manual do Utilizador descarregar pdf (Página 4)

MAX8884Y/MAX8884Z

700mA DC-DC Step-Down Converters

with Dual 300mA LDO in 2mm x 2mm CSP

4 _______________________________________________________________________________________

STEP-DOWN CONVERTER EFFICIENCY

vs. LOAD CURRENT, V

OUT

= 1.8V

MAX8884Y/Z toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

100

1 1000

MAX8884Y, V

= 3.2V

= 3.6V

= 4.2V

MAX8884Z, V

= 3.2V

= 3.6V

= 4.2V

STEP-DOWN CONVERTER EFFICIENCY

vs. LOAD CURRENT, V

OUT

= 1.2V

MAX8884Y/Z toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

100

1 1000

MAX8884Y, V

= 3.2V

= 3.6V

= 4.2V

MAX8884Z, V

= 3.2V

= 3.6V

= 4.2V

STEP-DOWN CONVERTER NO-LOAD

SUPPLY CURRENT vs. INPUT VOLTAGE

MAX8884Y/Z toc03

INPUT VOLTAGE (V)

SUPPLY CURRENT (μA)

54321

100

150

200

250

300

BUCK_EN

= V

LDO1_EN

= V

LDO2_EN

= 0

FALLING

RISING

MAX8884Y

MAX8884Z

STEP-DOWN OUTPUT VOLTAGE vs. LOAD

CURRENT (VOLTAGE POSITIONING)

MAX8884Y/Z toc04

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

10010

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

1.0

1 1000

SEL = IN1_

SEL = AGND

MAX8884Z STEP-DOWN CONVERTER

LIGHT LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc05

400ns/div

OUT

2V/div

100mA/div

AC-COUPLED

20mV/div

MAX8884Y STEP-DOWN CONVERTER

LIGHT LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc06

1μs/div

OUT

2V/div

100mA/div

AC-COUPLED

10mV/div

LOAD

= 50mA

MAX8884Z STEP-DOWN CONVERTER

HEAVY LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc07

200ns/div

OUT

2V/div

500mA/div

AC-COUPLED

10mV/div

LOAD

= 500mA

MAX8884Y STEP-DOWN CONVERTER

HEAVY LOAD SWITCHING WAVEFORMS

MAX8884Y/Z toc08

400ns/div

OUT

2V/div

500mA/div

AC-COUPLED

10mV/div

LOAD

= 500mA

Typical Operating Characteristics

= V

IN1A

= V

IN1B

= V

IN2

= 3.6V, V

BUCK

= 1.2V, V

LDO1

= 1.8V, V

LDO2

= 2.8V, MAX8884YEVKIT, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 ... 14 15

MAX8884Y/MAX8884Z 1

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