EVM3810-QB-25-01A Datasheet, PDF (15/17 Pages) MPS Industries, Inc. – 6V Input, 1.2A Module Synchronous Step-Down Converter with Integrated Inductor

MPM3810 –6V, 1.2A PEAK SIMPLE MODULE WITH INTEGRATED INDUCTOR
caused by the capacitance. For simplification, the
output-voltage ripple is estimated by:
ΔV_OUT
=
8
×
V_OUT
f_S2 × L₁
×
C2
×
⎛
⎜
⎝
1
−
V_OUT
V_IN
⎞
⎟
⎠
When using tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the output
ripple can be approximated by:
ΔV_OUT
=
V_OUT
f_S × L₁
× ^{⎛⎜⎝}1−
V_OUT
VIN
⎞
⎟⎠
×
R_ESR
The characteristics of the output capacitor affect
the stability of the regulation system.
PCB Layout
The module’s integrated inductor simplifies the
schematic and layout design (see Figures 3 and
4). Only FB resistors and input and output
capacitors are needed to complete the design.
The high-current paths (PGND, IN and OUT)
should be placed very close to the device with
short, direct, and wide traces. The input capacitor
needs to be as close to IN and PGND as
possible. The external feedback resistors should
be placed next to FB. Keep the switching node
away from the feedback network. For additional
device applications, please refer to related
evaluation board datasheets (EVB).
GNGD^GN^ND^D VIN
PGND
PGND
N/CC
NN/CC
PG
VIN
OUT
OUT
GND
OUT
Figure 3: Top View of Layout Guide
GND
VIN
OUT
GND FB
EN
PG
VIN
GND
OUT
Figure 4: Bottom View of Layout Guide
MPM3810 Rev. 1.1
www.MonolithicPower.com
15
12/8/2014
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