MAX8877EZK25-T Просмотр технического описания (PDF) - Maxim Integrated

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MAX8877EZK25-T

Low-Noise, Low-Dropout, 150mA Linear Regulators with "2982 Pinout

Maxim Integrated 

Low-Noise, Low-Dropout, 150mA Linear

Regulators with '2982 Pinout

Stable COUT ESR vs. Load Current is shown in the

Typical Operating Characteristics.

Use a 0.01µF bypass capacitor at BP for low output volt-

age noise. Increasing the capacitance will slightly

decrease the output noise, but increase the start-up time.

Values above 0.1µF provide no performance advantage

and are not recommended (see Shutdown Exit Delay

graphs in the Typical Operating Characteristics).

PSRR and Operation from

Sources Other than Batteries

The MAX8877/MAX8878 are designed to deliver low

dropout voltages and low quiescent currents in battery-

powered systems. Power-supply rejection is 63dB at

low frequencies and rolls off above 10kHz. See the

Power-Supply Rejection Ratio Frequency graph in the

Typical Operating Characteristics.

When operating from sources other than batteries,

improved supply-noise rejection and transient response

can be achieved by increasing the values of the input

and output bypass capacitors, and through passive fil-

tering techniques. The Typical Operating Charac-

teristics show the MAX8877/MAX8878’s line- and load-

transient responses.

Load-Transient Considerations

The MAX8877/MAX8878 load-transient response

graphs (see Typical Operating Characteristics) show

two components of the output response: a DC shift

from the output impedance due to the load current

change, and the transient response. Typical transient

for a step change in the load current from 0mA to 50mA

is 12mV. Increasing the output capacitor’s value and

decreasing the ESR attenuates the overshoot.

Input-Output (Dropout) Voltage

For output voltage greater than the minimum input volt-

age (2.5V), the regulator’s minimum input-output volt-

age differential (or dropout voltage) determines the

lowest usable supply voltage. In battery-powered sys-

tems, this will determine the useful end-of-life battery

voltage. Because the MAX8877/MAX8878 use a P-

channel MOSFET pass transistor, their dropout voltage

is a function of drain-to-source on-resistance (RDS(ON))

multiplied by the load current (see Typical Operating

Characteristics).

___________________Chip Information

TRANSISTOR COUNT: 247

SUBSTRATE CONNECTED TO GND

_

Expanded Ordering Information

OUTPUT VOLTAGE (xy) CODE

REGULAR SOT23

THIN SOT23

MAX887_EUK15-T

MAX887_EZK15-T

MAX887_EUK18-T

MAX887_EZK18-T

MAX887_EUK25-T

MAX887_EZK25-T

MAX887_EUK28-T

MAX887_EZK28-T

MAX887_EUK29-T

MAX887_EZK29-T

MAX887_EUK30-T

MAX887_EZK30-T

MAX887_EUK32-T

MAX887_EZK32-T

MAX887_EUK33-T

MAX887_EZK33-T

MAX887_EUK36-T

MAX887_EZK36-T

MAX887_EUK50-T

MAX887_EZK50-T

Other xy***

PRESET

OUTPUT

VOLTAGE (V)

1.50

1.80

2.50

2.80

2.84

3.00

3.15

3.30

3.60

5.00

x.y0

MAX8877

REGULAR

ADRG

ADQT

ACBM

ACBN

ACBO

ACBP

ACBQ

ACBR

ACDB

ACBS

—

SOT TOP MARK

MAX8877

THIN

MAX8878

REGULAR

AAAA

AAAB

ADQV

ADRH

AAAC

AAAD

ACBT

ACBU

ADPM

AAAE

ACBV

ACBW

AAAF

AAAG

AAAH

AAAI

ACBX

ACBY

ACDC

ACBZ

—

—

MAX8878

THIN

AAAJ

AAAK

AAAL

AAAM

ADPO

AAAN

AAAO

AAAP

AAAQ

AAAR

—

***Other xy between 1.5V and 5.0V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 25,000 units.

8 _______________________________________________________________________________________

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