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SC21152 Datasheet(PDF) 15 Page - Semtech Corporation

Part # SC21152
Description  Tiny 1.2A Synchronous Buck Regulator with Power Good
PDF  18 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC21152 Datasheet(HTML) 15 Page - Semtech Corporation

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SC21152
15
PCB Layout Guidelines
An optimum layout for the SC21152 is shown below.
When doing the PCB layout the following guidelines
should be used:
The input capacitor must be located as close as possible to
the IC and directly connected to pin 1 (VIN), pin 5 (GND),
and PAD (GND).
The LX trace from pin 6 to the inductor should be as short
as possible, and wide to reduce IR loss and improve heat
dissipation.
PCB Layout - Adjustable VOUT
The output capacitor should be close to the inductor. The
feedback components (Rtop, Ctop, Rbot, for adjustable
VOUT) should be located as close as possible to the FB pin.
For fixed VOUT, the output capacitor connects directly to
the FB pin.
The FB trace should be short and not routed near noise
signals. Do not route the FB trace under the inductor; the
high impedance of the FB circuit can pick up noise from
the inductor’s magnetic field.
CIN
L1
VOUT
VIN
SC21152
GND
GND
LX
FB
PG
EN
VOUT sense trace
CIN
L1
VOUT
VIN
SC21152
Rbot Rtop
Ctop
GND
GND
LX
FB
PG
EN
VOUT sense trace
PCB Layout - Fixed VOUT



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