Rainbow-electronics MAX8884Z Manual do Utilizador descarregar pdf (Página 3)

MAX8884Y/MAX8884Z

700mA DC-DC Step-Down Converters

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

_______________________________________________________________________________________ 3

PARAMETER CONDITIONS MIN TYP MAX UNITS

= +25°C 0.1 1

LX Leakage Current

IN1A

= V

IN1B

= V

IN2

= 5.5V,

= 0

= +85°C 1

μA

p-Channel MOSFET Peak Current

Limit

= 0 0.8 1.0 1.2 A

n-Channel MOSFET Valley

Current Limit

0.6 0.8 1.0 A

MAX8884Y_ 40

n-Channel MOSFET

Zero-Crossing Threshold

MAX8884Z_ 60

Minimum On-Time 0.07 μs

Minimum Off-Time 0.06 μs

Power-Up Delay From V

BUCK_EN

rising to V

rising 120 250 μs

LDO1, LDO2

SEL = AGND 1.764 1.800 1.836

Output Voltage V

LDO1

IN2

= 5.5V, I

LDO_

= 1mA;

IN2

= 3.4V, I

LDO_

= 100mA

SEL = IN1_ 2.800

Output Voltage V

LDO2

IN2

= 5.5V, I

LDO_

= 1mA;

IN2

= 3.4V, I

LDO_

= 100mA

2.770 2.800 2.830 V

Output Current 300 mA

Current Limit V

LDO_

= 0 310 450 750 mA

Dropout Voltage I

LDO_

= 100mA, T

= +25°C (V

LDO_

 2.5V) 70 200 mV

Line Regulation V

IN2

stepped from 3.5V to 5.5V, I

LDO_

= 100mA 2.4 mV

Load Regulation I

LDO_

stepped from 50μA to 200mA 25 mV

Power-Supply Rejection

V

LDO_

/V

IN2

10Hz to 100kHz, V

LDO_

= 1.8V,

LDO_

= 2.2μF, I

LDO_

= 30mA

65 dB

Output Noise

10Hz to 100kHz, V

LDO_

= 1.8V,

LDO_

= 2.2μF, I

LDO_

= 30mA

26 μV

RMS

0 < I

LDO_

< 10mA 0.1

10mA < I

LDO_

< 200mA 1

Output Capacitor for Stable

Operation

200mA < I

LDO_

< 300mA 2.2

μF

Shutdown Output Impedance V

LDO1_EN

= V

LDO2_EN

= 0 100 

Power-Up Delay From V

LDO_EN

rising to V

LDO_

output rising 150 250 μs

REFBP

REFBP Output Voltage 0  I

REFBP

 1μA 1.237 1.250 1.263 V

REFBP Supply Rejection V

IN2

stepped from 2.55V to 5.5V 0.2 5 mV

ELECTRICAL CHARACTERISTICS (continued)

IN1A

= V

IN1B

= V

IN2

= V

LDO1_EN

= V

LDO2_EN

= V

BUCK_EN

= 3.6V. T

= -40°C to +85°C, typical values are at T

= +25°C, unless

otherwise noted.) (Note 1)

Note 1: All devices are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed by

design.

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

MAX8884Y/MAX8884Z 1

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