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MIC2169ABMM Datasheet(PDF) 13 Page - Micrel Semiconductor

Part # MIC2169ABMM
Description  500kHz PWM Synchronous Buck Control IC
PDF  15 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2169ABMM Datasheet(HTML) 13 Page - Micrel Semiconductor

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April 2009
13
M9999-040609
MIC2169A
Micrel
Design Example
Layout and Checklist:
1. Connect the current limiting (R2) resistor directly
to the drain of top MOSFET Q3.
2. Use a 5Ω resistor from the input supply to the VIN
pin on the MIC2169. Also, place a 1µF ceramic
capacitor from this pin to GND, preferably not thru
a via.
3. The feedback resistors R3 and R4/R5/R6 should
be placed close to the FB pin. The top side of R3
should connect directly to the output node. Run
this trace away from the switch node (junction of
Q3, Q2, and L1). The bottom side of R3 should
connect to the GND pin on the MIC2169.
4. The compensation resistor and capacitors should
be placed right next to the COMP pin and the other
side should connect directly to the GND pin on the
MIC2169 rather than going to the plane.
5. Add a 1.4Ω resistor and a 1000pF capacitor from
the switch node to ground pin. See page 7, Current
Limiting section for more detail.
6. Add place holders for gate resistors on the top and
bottom MOSFET gate drives. If necessary, gate
resistors of 10Ω or less should be used.
7. Low gate charge MOSFETs should be used to
maximize efficiency, such as Si4800, Si4804BDY,
IRF7821, IRF8910, FDS6680A and FDS6912A,
etc.
8. Compensation component GND, feedback resistor
ground, chip ground should all run together and
connect to the output capacitor ground. See demo
board layout, top layer.
9. The 10µF ceramic capacitor should be placed
between the drain of the top MOSFET and the
source of the bottom MOSFET.
10.The 10µF ceramic capacitor should be placed right
on the VDD pin without any vias.
11.The source of the bottom MOSFETshould connect
directly to the input capacitor GND with a thick
trace. The output capacitor and the input capacitor
should connect directly to the GND plane.
12.Placea0.01µFto0.1µFceramiccapacitorinparallel
with the CS resistor to filter any switching noise.
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MIC2169AMM Evaluation Board Schematic



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