MAX5086
45V, 250mA, Low-Quiescent-Current
Linear Regulator with Adjustable Reset Delay
10 ______________________________________________________________________________________
Example 2:
T
A
= +125°C
V
IN
= +14V
V
OUT
= +5V
Calculate package dissipation at the given temperature
as follows:
And establish the maximum current:
Example 3:
T
A
= +50°C
V
IN
= +14V
V
OUT
= +5V
Calculate package dissipation at the given temperature
as follows:
P
D
= 2.666W
And find the maximum output current:
In Example 3, the maximum output current is calculated
as 296mA, however, the maximum output current can-
not exceed 250mA.
Use Figure 4 to quickly determine maximum allowable
output current for selected ambient temperatures.
Output Capacitor Selection and
Regulator Stability
For stable operation over the full temperature range
and with load currents up to 250mA, use a 15µF (min)
output capacitor with an ESR < 0.25Ω. To reduce noise
and improve load-transient response, stability, and
power-supply rejection, use larger output capacitor val-
ues such as 22µF.
Some ceramic capacitor dielectrics exhibit large
capacitance and ESR variation with temperature. For
capacitor dielectrics such as Y5V, use 22µF or more
to ensure stability at temperatures below -10°C. With
X7R or X5R dielectrics, 15µF should be sufficient at all
operating temperatures. To improve power supply
rejection and transient response, use a minimum 47µF
low ESR capacitor from IN to GND.
vs. INPUT VOLTAGE
