MAX8868 데이터 시트보기 (PDF) - Maxim Integrated

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MAX8868

Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23

Maxim Integrated 

Low-Noise, Low-Dropout,

150mA Linear Regulators in SOT23

Z5U and Y5V, it may be necessary to use 2.2µF or

more to ensure stability at temperatures below -10°C.

With X7R or X5R dielectrics, 1µF should be sufficient at

all operating temperatures. Also, for high-ESR tantalum

capacitors, 2.2µF or more may be needed to maintain

ESR in the stable region. A graph of the Region of

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

graph in the Typical Operating Characteristics).

PSRR and Operation from

Sources Other than Batteries

The MAX8867/MAX8868 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 filter-

ing techniques. The Typical Operating Characteristics

show the MAX8867/MAX8868’s line- and load-transient

responses.

Load-Transient Considerations

The MAX8867/MAX8868 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. A 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

A regulator’s minimum input-output voltage differential

(or dropout voltage) determines the lowest usable sup-

ply voltage. In battery-powered systems, this will deter-

mine the useful end-of-life battery voltage. Because the

MAX8867/MAX8868 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

PRESET

OUTPUT

VOLTAGE (V)

MAX8867

REGULAR

SOT TOP MARK

MAX8867

THIN

MAX8868

REGULAR

MAX8868

THIN

MAX886_EUK25-T

MAX886_EZK25-T

2.50

MAX886_EUK28-T

MAX886_EZK28-T

2.80

MAX886_EUK29-T

MAX886_EZK29-T

2.84

MAX886_EUK30-T

MAX886_EZK30-T

3.00

MAX886_EUK32-T

MAX886_EZK32-T

3.15

MAX886_EUK33-T

MAX886_EZK33-T

3.30

MAX886_EUK36-T

MAX886_EZK36-T

3.60

MAX886_EUK50-T

MAX886_EZK50-T

5.00

ACAY

ACAZ

ACBA

ACBB

ACBC

ACBD

ACCZ

ACBE

ADQM

ADQO

ADQP

ADQQ

ADQR

ADQS

ADQT

ADQV

ACBF

ACBG

ACBH

ACBI

ACBJ

ACBK

ACDA

ACBL

ADQW

ADQX

ADQY

ADQZ

ADRA

ADRB

ADRC

ADRD

Other xy***

x.y0

—

—

—

—

***Other xy between 2.5V and 5.0V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 25,000 units.

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