LM3743_08 Datasheet, PDF (25/28 Pages) National Semiconductor (TI) – High-Performance Synchronous Buck Controller with Comprehensive Fault Protection Features

Example Circuit
LM3743-300, V_IN = 3V to 5V, V_OUT = 1.5V, I_LOAD = 20A
In order to operate the LM3743 from an input voltage as low as 3V, the two components in the table below must replace the
components found in the bill of materials above. Common loads requiring 20 A are digital rails for FPGAs, ASICs, and DSPs, and
power distribution buses.
Designator
R1
Q1
Function
Current Limit Res
Top FET
Description
1.5k, 0603
4.5mΩ@VGS=4.5V,
21nC
Part Number
CRCW06031501F
Si7882DP
Vendor
Vishay
Vishay
R3 = 7.87 kΩ (Vout = 3.3V), 11.5 kΩ (Vout = 2.5V), 19.6 kΩ (Vout = 1.8V), 28 kΩ (Vout = 1.5V), 49.9 kΩ (Vout = 1.2V), 100 kΩ (Vout = 1.0V), open (Vout = 0.8V)
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