
                              CM3706
1.5MHz, 600mA
Synchronous
Step-Down Regulator
PIN DESCRIPTION 
2006/12/20
Rev. 1.6
                 Champion Microelectronic Corporation 
Page 3 
Pin No. 
Symbol 
Description 
1 
RUN 
Regulator Enable control input.  Drive RUN above 1.5V to turn on the part.  Drive RUN 
below 0.3V to turn it off.  In shutdown, all functions are disabled drawing <1μA supply 
current. Do not leave RUN floating. 
Ground Pin. 
2 
GND 
3 
SW 
Power Switch Output. It is the Switch note connection to Inductor. This pin connects to the 
drains of the internal P-CH and N-CH MOSFET switches.
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 2.2μF or greater ceramic 
capacitor.
VFB (CM3706): Feedback Input Pin. Connect FB to the center point of the external resistor 
divider.  The feedback threshold voltage is 0.6V. 
4 
VIN 
5 
FB 
ORDERING INFORMATION 
Part Number 
Voltage 
Temperature Range 
Package 
CM3706IM25 
Adj 
-40
 to +85
℃
℃
TSOT23-5 
CM3706GIM25 
Adj 
-40
 to +85
℃
℃
TSOT23-5 
CM3706   X  X  X   
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Absolute maximum ratings are those values beyond which the 
device could be permanently damaged. 
Input Supply Voltage...................................................–0.3V to 6.0V Peak SW Sink and Source Current………...…………….. 1.5A
RUN, VFB Voltages ………………………...…– 0.3V to (VIN + 0.3V) Junction Temperature (Note 2) ........... ........................ 125°C
SW Voltage....…………........………..……..… – 0.3V to (VIN + 0.3V) Storage Temperature Range ....................... – 65°C to 150°C
Operating Temperature Range
….…………..…
-40°C to +85°C
 Lead Temperature (Soldering, 10 sec)......................... 300°C
OPERATING CONDITIONS 
Temperature Range ............................. -40°C to 85°C  
Vin
Operating Range .........................2.5V to 5.5V 
Lead Free 
Suffix for 
Temperature 
Package 
I : 
-40
 to +85
℃
℃
M25 : TSOT23-5
Blank : Normal 
G: Lead Free 
Package