Low-Noise, Low-Dropout, 150mA Linear

Regulators with '2982 Pinout

8

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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

multiplied by the load current (see Typical Operating

Characteristics).

_

Expanded Ordering Information

___________________Chip Information

***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.

TRANSISTOR COUNT: 247

SUBSTRATE CONNECTED TO GND

OUTPUT VOLTAGE (xy) CODE

SOT TOP MARK

REGULAR SOT23

THIN SOT23

PRESET

OUTPUT

VOLTAGE (V)

MAX8877

REGULAR

MAX8877

THIN

MAX8878

REGULAR

MAX8878

THIN

MAX887_EUK15-T

MAX887_EZK15-T

1.50

ADRG

AAAA

ADQV

AAAJ

MAX887_EUK18-T

MAX887_EZK18-T

1.80

ADQT

AAAB

ADRH

AAAK

MAX887_EUK25-T

MAX887_EZK25-T

2.50

ACBM

AAAC

ACBT

AAAL

MAX887_EUK28-T

MAX887_EZK28-T

2.80

ACBN

AAAD

ACBU

AAAM

MAX887_EUK29-T

MAX887_EZK29-T

2.84

ACBO

ADPM

ACBV

ADPO

MAX887_EUK30-T

MAX887_EZK30-T

3.00

ACBP

AAAE

ACBW

AAAN

MAX887_EUK32-T

MAX887_EZK32-T

3.15

ACBQ

AAAF

ACBX

AAAO

MAX887_EUK33-T

MAX887_EZK33-T

3.30

ACBR

AAAG

ACBY

AAAP

MAX887_EUK36-T

MAX887_EZK36-T

3.60

ACDB

AAAH

ACDC

AAAQ

MAX887_EUK50-T

MAX887_EZK50-T

5.00

ACBS

AAAI

ACBZ

AAAR

Other xy***

x.y0

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