CM8566
2A A
DJUSTABLE
L
INEAR
R
EGULATOR
GENERAL DESCRIPTION
The CM8566 is a low cost linear regulator designed to
provide a desired output voltage or termination voltage for
various applications by converting voltage supplies ranging
from 1.6V to 6.0V. The desired output voltage could be
programmable by two external voltage divider resistors.
The CM8566 is capable of sourcing or sinking up to 2A of
current while regulating an output VOUT voltage .
The CM8566 provides low profile 8-pin SOIC package to
save system space.
FEATURES
8-pin SOIC w/ power pad package
2 ways to adjust the output, VOUT with VFB pin
Source and sink up to 2A , no heat sink required
Integrated power MOSFETs
Programmable output voltage by external resistors
Output voltage could go down to 0.6V
Iccq at VCCA less than 500uA
Current limit protection and Short Circuit protection
Thermal shutdown protection
Shutdown for standby or suspend mode operation
Minimum external components
APPLICATIONS
Mother Board
PCI/AGP Graphics
Game/ Play Station
Set Top Box
IPC
SCSI-III Bus terminator
PIN CONFIGURATION
SOP-8 (S08)
Top View
2007/02/01
Rev. 1.0
Champion Microelectronic Corporation
Page 1
CM8566
2A A
DJUSTABLE
L
INEAR
R
EGULATOR
PIN DESCRIPTION
Pin No.
8-Pin
1
2
3
4
5/7/8
6
Symbol
VIN
GND
REFEN
VOUT
NC
V
CNTL
Voltage supply for internal circuits
6
V
Input Power
Power Ground
Reference Voltage Input and Chip Enable
Output Voltage
6
6
V
V
Description
Operating Rating
Min.
Typ.
2.5/1.8
Max.
6
Unit
V
ORDERING INFORMATION
Part Number
CM8566IS
CM8566GIS
Temperature Range
-40℃ to 85℃
-40℃ to 85℃
Package
8-Pin SOP (S08)
8-Pin SOP (S08)
BLOCK DIAGRAM
VCCA
VIN
Current Limit
Protection
REFEN
Control
+
VOUT
-
Thermal
GND
5-Pin Block Diagram
VCCA
VIN
Current Limit
Protection
REFEN
Control
+
VOUT
-
Thermal
PGND
VFB
8-Pin Block Diagram
2007/02/01
Rev. 1.0
Champion Microelectronic Corporation
Page 2
CM8566
2A A
DJUSTABLE
L
INEAR
R
EGULATOR
APPLICATION CIRCUITS
VCCA
VIN
R1 & R2 to fix the Vref,
and Vout will follow Vref
R1
VCCA
VIN
CIN
470uF
CVCCA
10uF
GND
REFEN
VOUT
VFB
COUT
200uF
VOUT
Q1
R2
EN
CSS
1uF
Application Circuit as Fixed LDO
VCCA
VIN
R3 & R4 to set VFB, and
Vout range could be
adjusted from 0V to VIN
R1
VCCA
VIN
CIN
470uF
CVCCA
10uF
GND
REFEN
VOUT
VFB
R3
COUT
200uF
VOUT
Q1
R2
EN
CSS
1uF
R4
Application Circuit as Adjustable LDO
2007/02/01
Rev. 1.0
Champion Microelectronic Corporation
Page 3
CM8566
2A A
DJUSTABLE
L
INEAR
R
EGULATOR
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged.
VIN, VCCA, VFB
…................................…....….…………..6V
Lead Temperature (Soldering, 5 sec)……….……….. 260°C
Thermal Resistance(
θ
JC
)………..……..… 14°C/W (PSOP-8)
Thermal Resistance(
θ
JA
)……………………….…… 75°C/W
Output RMS Current, Source or Sink .....………….........…...2A
Storage Temperature
……...................…….. -65°C to 125°C
(Unless otherwise stated, these specifications apply T
A
=25°C;
VIN=+2.5V and VCCA=+3.3V, VREFEN=1.25V)
maximum ratings are stress ratings only and functional device operation is not
implied. (Note 1)
ELECTRICAL CHARACTERISTICS
CM8566
Symbol
V
OS
½ΔV
LOAD
½
I
SHDN
V
IN
Input Voltage Range (DDR l/ll)
V
CNTL
SHORT CIRCUIT PROTECTION
I
LIMIT
I
Q
Current Limit
Quiescent Current
I
L
=2.0A
--
--
2.5
1.4
--
3
A
mA
Parameter
Output Offset Voltage
Load Regulation (DDR I/II)
Current in Shutdown Mode
Test Conditions
Min.
I
OUT
=0A (Note 2)
I
L
: 0A -> 2A
I
L
: 0A -> -2A
REFEN<0.2V, R
L
= 180Ω
Keep V
CNTL
≧V
IN
on
operation power on and
power off sequences
3.3
6
-20
--
--
--
1.6
Typ.
-5
0.5
0.5
1
2.5/1.8
Max.
20
2
2
90
--
V
μA
mV
%
Unit
OVER THERMAL PROTECTION
T
CASE
Thermal Shutdown Temperature
Thermal Shutdown Hysterresis
SHUTDOWN FUNCTION
Shutdown Threshold Trigger
Output = High
Output = Low
Note 1:
Exceeding the absolute maximum rating may damage the device.
Note 2:
V
OS
Offset is the voltage measurement defined as V
OUT
subtracted from V
REFEN
.
0.8
--
--
--
--
0.2
V
3.3V≦V
CNTL
≦5V
Guaranteed by design
--
--
100
30
--
--
℃
℃
2007/02/01
Rev. 1.0
Champion Microelectronic Corporation
Page 4
CM8566
2A A
DJUSTABLE
L
INEAR
R
EGULATOR
FUNCTIONAL DESCRIPTION
The CM8566 is a linear regulator that is capable of sinking
and sourcing 2A of current without an external heat sink.
The CM8566 integrates power MOSFETs that are capable of
source and sink2A of current while maintaining excellent
voltage regulation. The output voltage can be regulated within
3% or less by using the external feedback. Separate voltage
supply inputs have been added to fit applications with various
power supplies for the databus and power buses.
INPUTS
The input voltage pins (VIN) determine the output voltages
(VOUT). At CM8566, the desired output voltage could be
programmable by two external voltage divider resistors. VIN is
suggested to connect to VDDQ of memory module for better
tracking with memory VDDQ.
OTHER SUPPLY VOLTAGES
VCCA provide the voltage supply to the logic section and
internal error amplifiers of CM8566.
OUTPUTS
The output voltage pins (VOUT) are tied to the databus,
address, or clock lines via an external inductor. Output voltage
is determined by the VIN.
2007/02/01
Rev. 1.0
Champion Microelectronic Corporation
Page 5
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