CM3718
1.5A L
OW
-N
OISE
PWM S
TEP
-D
OWN
R
EGULATOR
PIN DESCRIPTION
Pin No.
CM3718
Symbol
Description
Min.
Operating Rating
Typ.
Max.
Uni
t
1
2
3
VIN
GND
SD
Voltage supply for internal circuits
Ground for internal reference voltage divider
CMOS input level
V
OUT
Set Voltage
Feedback node for the V
OUT
Ground for output power transistors
Inductor connection to the Drains of the internal power MOSFETs
Voltage supply for output power transistors
Shutdown level
Enable level
2
2.5
5.5
V
0.75 x VIN
0
1.1
VREF
VIN + 0.3
2.0
VIN
V
4
5
6
7
8
VREF
VFB
PGND
LX
PVIN
V
V
5.5
2
2.5
5.5
V
V
ORDERING INFORMATION
Part Number
Temperature Range
Package
CM3718IS
CM3718GIS*
*Note:
G : Suffix for Pb Free Product
-40
℃
to 85
℃
-40
℃
to 85
℃
8-Pin PSOP (PS08)
8-Pin PSOP (PS08)
BLOCK DIAGRAM
VIN1
1
SD
3
PVIN
8
GND
2
Oscillator Ramp Generator
PW M Controller
Thermal
Protection
MOS
7
LX
VREF
4
Error Amp
5
VFB
6
PG ND
2006/10/11
Rev. 1.6
Champion Microelectronic Corporation
Page 2
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
