EC9208 Datasheet, PDF (10/11 Pages) E-CMOS Corporation – High Efficiency 1MHz, 2A, Step up Regulator

High Efficiency 1MHz, 2A, Step up Regulator EC9208
Application Information
The schottky diode reverse breakdown voltage should be larger
than the output voltage.
Layout Design:
The layout design of EC9208 regulator is relatively simple. For
the best efficiency and minimum noise problems, we should
place the following components close to the IC: CIN, L, R1 and R2
1) It is desirable to maximize the PCB copper area connecting to
GND pin to achieve the best thermal and noise performance. If
the board space allowed, a ground plane is highly desirable.
2) CIN must be close to Pins IN and GND. The loop area formed
by CIN and GND must be minimized.
3) The PCB copper area associated with LX pin must be
minimized to avoid the potential noise problem.
4) The components R1 and R2, and the trace connecting to the FB
pin must NOT be adjacent to the LX net on the PCB layout to
avoid the noise problem.
5) If the system chip interfacing with the EN pin has a high
impedance state at shutdown mode and the IN pin is connected
directly to a power source such as a Li‐Ion battery, it is desirable
to add a pull down 1Mohm resistor between the EN and GND
pins to prevent the noise from falsely turning on the regulator at
shutdown mode.
E-CMOS Corp. (www.ecmos.com.tw)
Page 10 of 11
4D10N-Rev.F001