SC1182 Ver la hoja de datos (PDF) - Semtech Corporation
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SC1182 Datasheet PDF : 14 Pages
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SC1182 & SC1183
POWER MANAGEMENT
Layout Guidelines
4) The Output Capacitor(s) (Cout) should be located as
close to the load as possible, fast transient load cur-
rents are supplied by Cout only, and connections between
Cout and the load must be short, wide copper areas to
minimize inductance and resistance.
5) The SC1182/3 is best placed over a quiet ground plane
area, avoid pulse currents in the Cin, Q1, Q2 loop flowing
in this area. PGNDH and PGNDL should be returned to
the ground plane close to the package. The AGND pin
should be connected to the ground side of (one of) the
output capacitor(s). If this is not possible, the AGND pin
may be connected to the ground path between the Output
Capacitor(s) and the Cin, Q1, Q2 loop. Under no circum-
stances should AGND be returned to a ground inside the
Cin, Q1, Q2 loop.
supply through a 10Ω resistor, the Vcc pin should be
decoupled directly to AGND by a 0.1µF ceramic capacitor,
trace lengths should be as short as possible.
7) The Current Sense resistor and the divider across it
should form as small a loop as possible, the traces run-
ning back to CS+ and CS- on the SC1182/3 should run
parallel and close to each other. The 0.1µF capacitor should
be mounted as close to the CS+ and CS- pins as possible.
8) Ideally, the grounds for the two LDO sections should be
returned to the ground side of (one of) the output
capacitor(s).
6) Vcc for the SC1182/3 should be supplied from the 5V
5V
+
Vout
+
Currents in various parts of the power section
© 2001 Semtech Corp.
8
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