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LT3470ETS8 Datasheet

  • LT3470ETS8

  • Micropower Buck Regulator with Integrated Boost and Catch Di...

  • 16頁

  • Linear

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LT3470
APPLICATIO S I FOR ATIO
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
V
IN
LT3470
+
2.2碌F
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
10碌F
35V
AI.EI.
+
2.2碌F
1鈩?/div>
LT3470
0.1碌F
2.2碌F
Figure 6: A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3470 is Connected to a Live Supply
in the circuit. An alternative solution is shown in Figure 6c.
A 1鈩?resistor is added in series with the input to eliminate
the voltage overshoot (it also reduces the peak input
current). A 0.1碌F capacitor improves high frequency filter-
ing. This solution is smaller and less expensive than the
electrolytic capacitor. For high input voltages its impact on
efficiency is minor, reducing efficiency less than one half
percent for a 5V output at full load operating from 24V.
High Temperature Considerations
The die temperature of the LT3470 must be lower than the
maximum rating of 125擄C. This is generally not a concern
unless the ambient temperature is above 85擄C. For higher
temperatures, care should be taken in the layout of the
circuit to ensure good heat sinking of the LT3470. The
maximum load current should be derated as the ambient
U
V
IN
10V/DIV
I
IN
10A/DIV
10碌s/DIV
W
U U
(6a)
LT3470
(6b)
(6c)
3470 F06
temperature approaches 125擄C. The die temperature is
calculated by multiplying the LT3470 power dissipation
by the thermal resistance from junction to ambient.
Power dissipation within the LT3470 can be estimated by
calculating the total power loss from an efficiency mea-
surement. Thermal resistance depends on the layout of
the circuit board, but a value of 150擄C/W is typical. The
temperature rise for an LT3470 producing 5V at 200mA
is approximately 30擄C, allowing it to deliver full load to
100擄C ambient. Above this temperature the load current
should be reduced. For 3.3V at 200mA the temperature
rise is 20擄C. Finally, be aware that at high ambient
temperatures the internal Schottky diode will have signifi-
cant leakage current (See Typical Performance Charac-
teristics) increasing the quiescent current of the LT3470
converter.
3470f
13

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