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LTM8048
APPLICATIONS INFORMATION
LTM8048 Table 1b. Recommended Component Values and Configuration for Specific V OUT2 Voltages (T A = 25°C)
V IN
3.1V to 32V
3.1V to 32V
3.1V to 32V
3.1V to 32V
3.1V to 32V
3.1V to 29V
3.1V to 26V
3.1V to 21V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
9V to 15V
18V to 32V
18V to 32V
18V to 32V
18V to 32V
18V to 32V
18V to 29V
18V to 26V
V OUT1
1.71V
2.02V
2.34V
3.08V
3.92V
5.7V
8.85V
13V
1.71V
2.02V
2.34V
3.08V
3.92V
5.7V
8.85V
13V
1.71V
2.02V
2.34V
3.08V
3.92V
5.7V
8.85V
V OUT2
1.2V
1.5V
1.8V
2.5V
3.3V
5V
8V
12V
1.2V
1.5V
1.8V
2.5V
3.3V
5V
8V
12V
1.2V
1.5V
1.8V
2.5V
3.3V
5V
8V
V BIAS
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
V IN
V IN
V IN
V IN
V IN
V IN
V IN
V IN
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
3.1V to 15V or Open
C IN
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 25V, 0805
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 25V, 0805
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
2.2μF, 50V, 1206
C OUT1
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
47μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
10μF, 16V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
47μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
10μF, 16V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
100μF, 6.3V, 1210
47μF, 6.3V, 1210
22μF, 16V, 1210
22μF, 10V, 1206
C OUT2
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 10V, 1206
10μF, 16V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 10V, 1206
10μF, 16V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 6.3V, 1206
10μF, 10V, 1206
R ADJ1
16.5k
14.7k
13.3k
10.5k
8.66k
6.19k
4.12k
2.94k
16.5k
14.7k
13.3k
10.5k
8.66k
6.19k
4.12k
2.94k
16.5k
14.7k
13.3k
10.5k
8.66k
6.19k
4.12k
R ADJ2
Open
2.32M
1.07M
487k
294k
162k
88.7k
56.2k
Open
2.32M
1.07M
487k
294k
162k
88.7k
56.2k
Open
2.32M
1.07M
487k
294k
162k
88.7k
Note: Do not allow BIAS to exceed V IN , a bulk input capacitor is required.
BIAS Pin Considerations
The BIAS pin is the output of an internal linear regulator
that powers the LTM8048’s internal circuitry. It is set to
3V and must be decoupled with a low ESR capacitor of at
least 4.7μF. The LTM8048 will run properly without apply-
ing a voltage to this pin, but will operate more efficiently
and dissipate less power if a voltage greater than 3.1V is
applied. At low V IN , the LTM8048 will be able to deliver
more output current if BIAS is 3.1V or greater. Up to 32V
may be applied to this pin, but a high BIAS voltage will
cause excessive power dissipation in the internal circuitry.
For applications with an input voltage less than 15V, the
BIAS pin is typically connected directly to the V IN pin. For
input voltages greater than 15V, it is preferred to leave the
BIAS pin separate from the V IN pin, either powered from
a separate voltage source or left running from the internal
regulator. This has the added advantage of keeping the
physical size of the BIAS capacitor small. Do not allow
BIAS to rise above V IN .
Soft-Start
For many applications, it is necessary to minimize the
inrush current at start-up. The built-in soft-start circuit
significantly reduces the start-up current spike and output
voltage overshoot by applying a capacitor from SS to GND.
When the LTM8048 is enabled, whether from V IN reaching
a sufficiently high voltage or RUN being pulled high, the
LTM8048 will source approximately 10μA out of the SS
pin. As this current gradually charges the capacitor from
SS to GND, the LTM8048 will correspondingly increase
the power delivered to the output, allowing for a graceful
turn-on ramp.
8048ff
For more information www.linear.com/LTM8048
11
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