Texas Instruments LM267 Series, User Manual, Page: 2 / 14

General Description
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Figure 1. Example Schematic Showing Connection for all Components.
Table 2. List of Component Labels and Functionality
Label Function
U1 LM267 Switching Regulator IC
CIN Input Capacitor(s); All devices.
CINX 0.47 µF, optional high frequency input bypass capacitor, recommended in all designs: All
devices.
CB Boost capacitor; All devices.
D1 Catch diode; All devices.
R1 Feedback resistor for adjustable output converters. This designator is left open (not
connected) for fixed output converters.
R2 Feedback resistor (typ. 1 k Ω ) for adjustable output converters. This designator is left shorted
(replaced by a jumper wire) for fixed output voltage converters.
R3* Current limit resistor for LM2673, LM2679; Sync input resistor (1 k Ω ) for LM2670 and
LM2677; Not inserted for LM2676 and LM2678.
L1 Inductor; All devices.
CSYNC Sync input capacitor (100 pF); LM2670 and LM2677only. Not inserted with other devices.
CSS Soft start capacitor; LM2673 and LM2679 only. Not inserted with other devices.
COUTX 0.47 µF, optional high frequency output bypass capacitor; All devices.
COUT Output capacitor(s); All devices.
2 AN-1135 LM267X 3A, 5A Evaluation Boards SNVA013D – December 2000 – Revised April 2013
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