MIC22705_11 Datasheet, PDF (3/29 Pages) Micrel Semiconductor – 1MHz, 7A Integrated Switch High-Efficiency Synchronous Buck Regulator

Micrel, Inc.
MIC22705
Pin Description (Continued)
Pin Number
15
16
17
7, 12, 19, 24
8, 9, 10, 11,
20, 21, 22, 23
EP
Pin Name
COMP
SGND
SVIN
PGND
SW
GND
Description
Compensation Pin (Input): The MIC22705 uses an internal compensation network containing a
fixed-frequency zero (phase lead response) and pole (phase lag response) which allows the
external compensation network to be much simplified for stability. The addition of a single
capacitor and resistor to the COMP pin will add the necessary pole and zero for voltage mode
loop stability using low-value, low-ESR ceramic capacitors.
Signal Ground: Internal signal ground for all low power circuits.
Signal Power Supply Voltage (Input): This pin is connected externally to the PVIN pin. A 2.2µF
ceramic capacitor from the SVIN pin to SGND must be placed next to the IC.
Power Ground: Internal ground connection to the source of the internal N-Channel MOSFETs.
Switch (Output): This is the connection to the drain of the internal P-Channel MOSFET and drain
of the N-Channel MOSFET. This is a high-frequency, high-power connection; therefore traces
should be kept as short and as wide as practical.
Exposed Pad (Power): Must be connected to the GND plane for full output power to be realized.
March 2011
3
M9999-033111-A