Rainbow Electronics MAX15007 - Manual (Page 11)

MAX15006/MAX15007
40V, Ultra-Low Quiescent-Current
Linear Regulators in 6-Pin TDFN/8-Pin SO
______________________________________________________________________________________ 11
Then determine the maximum output current:
Example 3 (TDFN Package):
T
A
= +50°C
V
IN
= 9V
V OUT = 5V
Calculate the maximum allowable package dissipation
at the given temperature as follows:
P D = 1.9048W
Find the maximum output current:
In Examples 2 and 3, the maximum output current is
calculated as 172mA and 476mA, respectively; howev-
er, the allowable output current cannot exceed 50mA.
Alternately, use Figures 5a and 5b to quickly determine
the maximum allowable output current for selected
ambient temperatures and input voltages.
Output-Capacitor Selection
and Regulator Stability
For stable operation over the full temperature range
and with load currents up to 50mA, use a low-ESR
2.2µF (min) ceramic or tantalum output capacitor. Use
larger output-capacitor values such as 22µF to reduce
noise, improve load-transient response, and power-
supply rejection.
Some ceramic dielectrics exhibit large capacitance
and ESR variations with temperature. Ensure the mini-
mum capacitance under worst-case conditions does
not drop below 1.3µF to ensure output stability. With an
X7R dielectric, 2.2µF should be sufficient at all operat-
ing temperatures.
I
1.9048W
9V 5V
476mA
OUT(MAX) ( )
=
−
= ⇒ = I mA
OUT MAX
50
I
1.5478W
14V 5V
172mA
OUT(MAX) ( )
=
−
= ⇒ = I mA
OUT MAX
50
MAX15006 fig05a
V IN (V)
I OUT(MAX)
(mA)
35 30 20 25 10 15 5
5
10
15
20
25
30
35
40
45
50
55
60
0
0 40
T A = +85 °C
T A = +70 °C
T A = +125 °C
V OUT = 5V
6-PIN TDFN
Figure 5a. Calculated Maximum Output Current vs. Input
Voltage (6-Pin TDFN-EP)
MAX15006 fig05b
V IN (V)
I OUT(MAX)
(mA)
35 30 20 25 10 15 5
5
10
15
20
25
30
35
40
45
50
55
60
0
0 40
T A = +85 °C
T A = +70 °C
T
A
= +125 °C
V OUT = 5V
8-PIN SO-EP
Figure 5b. Calculated Maximum Output Current vs. Input
Voltage (8-Pin SO-EP)