MAX8892EXK+T datasheet(6/8 Pages) MAXIM

Part #	MAX8892EXK+T

Description	High PSRR, Low-Dropout, 150mA Linear Regulators

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Manufacturer	MAXIM [Maxim Integrated Products]

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Thermal-Overload Protection

Thermal-overload protection limits total power dissipation

in the MAX8891/MAX8892. When the junction tempera-

ture exceeds TJ = +160°C, the thermal sensor signals

the shutdown logic, turning off the pass transistor and

allowing the IC to cool down. The thermal sensor turns

the pass transistor on again after the IC’s junction tem-

perature drops by 10°C, resulting in a pulsed output dur-

ing continuous thermal-overload conditions.

Thermal-overload protection is designed to protect the

MAX8891/MAX8892 in the event of a fault condition. For

continual operation, do not exceed the absolute maxi-

mum junction temperature rating of TJ = +150°C.

Operating Region and Power Dissipation

The MAX8891/MAX8892 maximum power dissipation

depends on the thermal resistance of the case and cir-

cuit board, the temperature difference between the die

junction and ambient, and the rate of airflow. The power

dissipation across the device is:

P = IOUT (VIN - VOUT)

The maximum power dissipation is:

PMAX = (TJ - TA)/(

θJC + θCA)

where TJ - TA is the temperature difference between the

MAX8891/MAX8892 die junction and the surrounding air,

θJC is the thermal resistance of the package, and θCA is

the thermal resistance through the PCB, copper traces,

and other materials to the surrounding air.

The GND pin of the MAX8891/MAX8892 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.

Applications Information

Capacitor Selection

and Regulator Stability

Use a 1µF capacitor on the MAX8891/MAX8892 input

and a 1µF capacitor on the output. Larger input capacitor

values and lower ESRs provide better noise rejection and

line-transient response. Reduce output noise and

improve load-transient response, stability, and power-

supply rejection by using large output capacitors. Note

that some ceramic dielectrics exhibit large capacitance

and ESR variation with temperature. With dielectrics such

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

larger output capacitor to ensure stability at temperatures

below -10°C. With X7R or X5R dielectrics, 1µF is sufficient

at all operating temperatures. A graph of the region of

stable COUT ESR vs. load current is shown in the Typical

Operating Characteristics.

PSRR and Transient Response

The MAX8891/MAX8892 are designed to deliver high

PSRR as well as low dropout and low quiescent currents

in battery-powered systems. The MAX8891/MAX8892

power-supply rejection is 65dB at 10kHz.

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 Characteristics

show the MAX8891/MAX8892 line- and load-transient

responses.

Dropout Voltage

A regulator’s minimum dropout voltage determines the

lowest usable supply voltage. In battery-powered

systems, this determines the useful end-of-life battery

voltage. Because the MAX8891/MAX8892 use a

p-channel MOSFET pass transistor, their dropout volt-

age is a function of drain-to-source on-resistance

(RDS(ON)) multiplied by the load current (see the Typical

Operating Characteristics).

High PSRR, Low-Dropout, 150mA

Linear Regulators

6

Maxim Integrated

MAX8891/MAX8892

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