LMZ23605_15 Datasheet, PDF (17/33 Pages) Texas Instruments – LMZ23605 5-A SIMPLE SWITCHER® Power Module With 36-V Maximum Input Voltage

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8 Application and Implementation
LMZ23605
SNVS659I – MARCH 2011 – REVISED AUGUST 2015
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 should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LMZ23605 is a step-down DC-to-DC power module. It is typically used to convert a higher DC voltage to a
lower DC voltage with a maximum output current of 5 A. The following design procedure can be used to select
components for the LMZ23605. Alternately, the WEBENCH software may be used to generate complete designs.
When generating a design, the WEBENCH software uses iterative design procedure and accesses
comprehensive databases of components. Please go to www.ti.com for more details.
8.2 Typical Application
U1
7V to 36V
PGND/EP
Enable
VIN
+
CIN6 OPT
150 PF
LMZ23605TZ
3.3VO @ 5A
RENT
42.2k
D1 OPT
5.1V
RENB
12.7k
SYNC
CIN2,3
10 PF
RENH OPT
100
CIN1,5
0.047 PF
RSNOPT
1.50 k:
RFBT
3.32k
RFRA OPT
23.7:
CSS
0.47 PF _RFBB
1.07k
CO1,6
0.047 PF
CO2
100 PF
OPT
+ _CO5
220 PF
Figure 49. Typical Application Schematic
8.2.1 Design Requirements
For this example the following application parameters exist:
• V_IN Range = Up to 36 V
• V_OUT = 0.8 V to 6 V
• I_OUT = 5 A
8.2.2 Detailed Design Procedure
8.2.2.1 Design Steps
The LMZ23605 is fully supported by WEBENCH which offers: component selection, electrical and thermal
simulations. Additionally there are both evaluation and demonstration boards that may be used as a starting point
for design. The following list of steps can be used to manually design the LMZ23605 application.
All references to values refer to the Figure 49.
1. Select minimum operating V_IN with enable divider resistors
2. Program V_O with resistor divider selection
3. Select C_O
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