MAX15103EWL データシートの表示（PDF） - Maxim Integrated

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MAX15103EWL

Small 3A, Low-Dropout Linear Regulator in a 2.7mm x 1.6mm Package

Maxim Integrated 

MAX15103

Small 3A, Low-Dropout Linear Regulator

in a 2.7mm x 1.6mm Package

Input-Output (Dropout) Voltage

A regulator’s minimum input-to-output voltage differential

(dropout voltage) determines the lowest usable supply

voltage. The dropout voltage is simply the product of

regulator’s RDS(ON) for the pass device and rated load

current. The MAX15103’s RDS(ON) is 20mΩ, at 3A this

yields a dropout voltage of 60mV (see the Electrical

Characteristics and the Dropout Voltage vs. Output

Current graph in the Typical Operating Characteristics).

Noise, PSRR, and Transient Response

The MAX15103 is designed to achieve low dropout volt-

age while still maintaining good noise, transient response,

and AC rejection. When operating from very noisy sourc-

es, supply noise rejection and transient response can

be improved by increasing the values of the input and

output capacitors. The MAX15103 output noise is typically

15µVRMS (see the Noise Density graph in the Typical

Operating Characteristics).

Thermal Considerations

in PCB Layout

The rated package dissipation strongly depends on the

copper area connected to the regulator. The maximum

power dissipation allowed in the package is 1538mW

(measured from the MAX15103 EV kit).

More power dissipation can be handled by the package if

great attention is given during PCB layout. For example,

using the top and bottom copper as a heatsink and

connecting the thermal vias to one of the middle layers

(GND) transfers the heat from the package into the board

more efficiently, resulting in lower junction temperature at

high power dissipation in some MAX15103 applications.

Furthermore, the solder mask around the IC area on both

top and bottom layers can be removed to radiate the heat

directly into the air. The maximum allowable power dis-

sipation in the IC is as follows:

PMAX = [(TJ(MAX) - TA)/(θJA)]

where (TJ(MAX) - TA) is the temperature difference

between the maximum-allowed die junction (+150°C) and

the surrounding air.

A sample layout is available on the MAX15103 EV kit.

Ordering Information

PART

MAX15103EWL+

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

15 WLP

+Denotes a lead(Pb)-free/RoHS-compliant package.

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

PACKAGE PACKAGE

TYPE

CODE

OUTLINE

NO.

15 WLP W151B2+1 21-0205

LAND

PATTERN NO.

Refer to

Application

Note 1891

www.maximintegrated.com

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