Datasheet

LM2598
SNVS125C –MARCH 1998–REVISED APRIL 2013 www.ti.com
This method of generating a negative output voltage without an additional inductor can be used with other
members of the Simple Switcher Family, using either the buck or boost topology.
Figure 49. Charge Pump for Generating a
Low Current, Negative Output Voltage
TYPICAL THROUGH HOLE PC BOARD LAYOUT, FIXED OUTPUT (1X SIZE), DOUBLE SIDED, THROUGH HOLE PLATED
C
IN
—150 μF/50V Aluminum Electrolytic, Panasonic R
PULL-UP
—10 kΩ
“HFQ series”
C
OUT
—120 μF/25V Aluminum Electrolytic, Panasonic C
DELAY
—0.1 μF
“HFQ series”
D1—3A, 40V Schottky Rectifier, 1N5822 C
SD/SS
—0.1 μF
L1—68 μH, L30, Renco, Through hole
Figure 50. Fixed Output PC Board Layout
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