Datasheet

LM2574, LM2574HV
www.ti.com SNVS104C –JUNE 1999–REVISED APRIL 2013
Block Diagram
R1 = 1k
3.3V, R2 = 1.7k
5V, R2 = 3.1k
12V, R2 = 8.84k
15V, R2 = 11.3k
For Adj. Version
R1 = Open, R2 = 0Ω
Note: Pin numbers are for the 8-pin PDIP package.
Figure 22.
Test Circuit and Layout Guidelines
C
IN
— 22 μF, 75V
Aluminum Electrolytic
C
OUT
— 220 μF, 25V
Aluminum Electrolytic
D1 — Schottky, 11DQ06
L1 — 330 μH, 52627
(for 5V in, 3.3V out, use
100 μH, RL-1284-100)
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
Figure 23. Fixed Output Voltage Versions
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