Setup
2.2
Board Setup
Before applying power to the LM74670-Q1EVM, all external connections should be verified. External
power supplies should be turned off and connected with proper polarity to the VBAT_1 and GND
connectors.
An electronic or resistive load must be connected at the output.
. The LM74670-Q1 will
not initiate the charge pump operation if a closed loop system is in standby mode or the drain current is
smaller than 1mA (typical). The tests outlined in this document have 3A constant load current and 12V
input voltage supply (VBAT_1). Make sure that the external power supply source for the input voltage is
capable of providing enough current to the output load so that the output voltage can be obtained.
Once all connections to the LM74670-Q1-SQEVM are verified, power can be applied to VBAT_1. The
EVM will then begin to operate.
Figure 2. LM74670-Q1-SQ EVM
5
SNVU494 – October 2015
List of Tables
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