LM2738_16 Datasheet, PDF (15/40 Pages) Texas Instruments – 1.5A Step-Down DC-DC Switching Regulator

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8 Application and Implementation
LM2738
SNVS556C – APRIL 2008 – REVISED JANUARY 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers must
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM2738 operates over a wide range of conditions, which is limited by the ON time of the device. Figure 29
shows the recommended operating area for the X version at the full load (1.5 A) and at 25°C ambient
temperature. The Y version of the LM2738 operates at a lower frequency, and therefore operates over the entire
range of operating voltages.
Figure 29. LM2738X – 1.6 MHz (25°C, Load = 1.5 A)
8.2 Typical Applications
8.2.1 LM2738X Circuit Example 1
V_IN
C1 R3
ON
OFF
D2
V_IN
BOOST
C3
SW
LM2738
D1
EN
FB
GND
L1
V_OUT
C2
R1
R2
Figure 30. LM2738X (1.6 MHz)
V_BOOST Derived from V_IN
5 V to 1.5 V/1.5 A
8.2.1.1 Design Requirements
The device must be able to operate at any voltage within the Recommended Operating Conditions. The load
current must be defined to properly size the inductor, input, and output capacitors. The inductor must be able to
support the full expected load current as well as the peak current generated from load transients and start-up.
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