MAX15104 Datasheet, PDF (9/10 Pages) Maxim Integrated Products – Small 2A, Low-Dropout Linear Regulator in a 2.7mm x 1.6mm Package

MAX15104
Small 2A, 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 R_DS(ON) for the pass device and rated load
current. The MAX15104‘s R_DS(ON) is 25mI, at 2A this
yields a dropout voltage of 50mV (see the Electrical
Characteristics and the Dropout Voltage vs. Output
Current graph in the Typical Operating Characteristics).
Noise, PSRR, and Transient Response
The MAX15104 is designed to achieve low dropout
voltage while still maintaining good noise, transient
response, and AC rejection. When operating from very
noisy sources, supply noise rejection and transient
response can be improved by increasing the values of
the input and output capacitors. The MAX15104 output
noise is typically 15FV_RMS (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 MAX15104 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 MAX15104 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:
P_MAX = [(T_J(MAX) - T_A)/(B_JA)]
where (T_J(MAX) - T_A) is the temperature difference
between the maximum-allowed die junction (+150NC)
and the surrounding air.
A sample layout is available on the MAX15104 EV kit.
Ordering Information
PART
MAX15104EWL+
TEMP RANGE
-40NC to +85NC
PIN-PACKAGE
15 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
PROCESS: BiCMOS
Chip Information
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.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.
LAND
PATTERN NO.
15 WLP W151B2+1 21-0205
Refer to
Application
Note 1891
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