SP6205EM5-L-3-3 Datasheet, PDF (11/14 Pages) Exar Corporation – GENERAL DESCRIPTION

SP6 2 0 3 / SP6 2 0 5
3 0 0 m A / 5 0 0 m A Lo w N o i se CM OS LDO Re g u l a t o r s
After calculation, we find that in such an
LAYOUT CONSIDERATIONS
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output current to 260.9mA.
careful considerations have to be taken into
account:
Also, taking advantage of the very low dropout
voltage characteristics of the SP6203/6205,
power dissipation can be reduced by using the
lowest possible input voltage to minimize the
input - to - output drop.
1) Attaching the part to a larger copper
footprint will enable better heat transfer from
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are int ernal ground and power planes.
A DJUSTABLE REGULATOR A PPLICATIONS
2) Place the input, output and bypass
capacitors close to the device for optimal
The SP6203/6205 can be adjusted to a specific
transient response and device behavior.
output voltage by using two external resistors
3) Connect all ground connections directly to
(see functional diagram). The resistors
set the
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output voltage based on the following
plane, connect to a common local ground point
equation:
before connecting to board ground.
V_OUT = V _REF *(R1/R2 + 1)
Resistor values are not critical because ADJ
(adjust) has a high input impedance, but for
best performance use resistors of 470K Ÿ or
less. A bypass capacitor from ADJ to V _OUT
provides improved noise performance.
Such layouts will provide a much better
thermal conductivity (lower
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maximum allowable power dissipation limit.
D UAL - SUPPLY OPERATION
When used in dual supply systems where the
regulator load is returned to a negative
supply, the output voltage must be diode
clamped to ground.
© 2012 Exar Corporation
11 / 14
Rev. 2.0.0