MAX8863REUK+T datasheet(8/10 Pages) MAXIM

Part #	MAX8863REUK+T

Description	Low-Dropout, 120mA Linear Regulators

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Dropout, 120mA Linear Regulators

8

Operating Region and Power Dissipation

Maximum power dissipation of the MAX8863/MAX8864

depends on the thermal resistance of the case and cir-

cuit board, the temperature difference between the die

junction and ambient air, and the rate of air flow. The

power dissipation across the device is P = IOUT (VIN -

VOUT). The resulting maximum power dissipation is:

PMAX = (TJ - TA) /

θJA

where (TJ - TA) is the temperature difference between

the MAX8863/MAX8864 die junction and the surround-

ing air, and

θJA is the thermal resistance of the chosen

package to the surrounding air.

The GND pin of the MAX8863/MAX8864 performs the

dual function of providing an electrical connection to

ground and channeling heat away. Connect the GND

pin to ground using a large pad or ground plane.

Reverse Battery Protection

The MAX8863/MAX8864 have a unique protection

scheme that limits the reverse supply current to less

than 1mA when either VIN or VSHDN falls below ground.

The circuitry monitors the polarity of these two pins, dis-

connecting the internal circuitry and parasitic diodes

when the battery is reversed. This feature prevents the

device from overheating and damaging the battery.

VIN > 5.5V Minimum Load Current

When operating the MAX8863/MAX8864 with an input

voltage above 5.5V, a minimum load current of 20µA is

required to maintain regulation in preset voltage mode.

When setting the output with external resistors, the min-

imum current through the external feedback resistors

and load must be 30µA.

__________Applications Information

Capacitor Selection and

Regulator Stability

Normally, use a 1µF capacitor on the input and a 1µF

capacitor on the output of the MAX8863/MAX8864.

Larger input capacitor values and lower ESR provide

better supply-noise rejection and transient response. A

higher-value input capacitor (10µF) may be necessary

if large, fast transients are anticipated and the device is

located several inches from the power source. Improve

load-transient response, stability, and power-supply

rejection by using large output capacitors. For stable

operation over the full temperature range, with load cur-

rents up to 120mA, a minimum of 1µF is recommended.

Noise

The MAX8863/MAX8864 exhibit 350µVRMS noise during

normal operation. When using the MAX8863/MAX8864

in applications that include analog-to-digital converters

of greater than 12 bits, consider the ADC’s power-sup-

ply rejection specifications (see the Output Noise DC to

1MHz photo in the

Typical Operating Characteristics).

Power-Supply Rejection and Operation

from Sources Other than Batteries

The MAX8863/MAX8864 are designed to deliver low

dropout voltages and low quiescent currents in battery-

powered systems. Power-supply rejection is 62dB at

low frequencies and rolls off above 300Hz. As the fre-

quency increases above 20kHz, the output capacitor is

the major contributor to the rejection of power-supply

noise (see the Power-Supply Rejection Ratio vs.

Ripple Frequency graph in the

Typical Operating

Characteristics).

When operating from sources other than batteries,

improve supply-noise rejection and transient response

by increasing the values of the input and output capac-

itors, and using passive filtering techniques (see the

supply and load-transient responses in the

Typical

Operating Characteristics).

Load Transient Considerations

The MAX8863/MAX8864 load-transient response

graphs (see

Typical Operating Characteristics) show

two components of the output response: a DC shift of

the output voltage due to the different load currents,

and the transient response. Typical overshoot for step

changes in the load current from 0mA to 50mA is

12mV. Increasing the output capacitor’s value and

decreasing its ESR attenuates transient spikes.

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