CM8561
1.5A S
INK
& S
OURCE
A
DJUSTABLE
L
INEAR
B
US
T
ERMINATOR
GENERAL DESCRIPTION
The CM8561 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 CM8561 is capable of sourcing or sinking up to 1.5A of
current while regulating an output VOUT voltage to within 2%
(DDR-I), 3% (DDR-II) or less.
The CM8561 provides low profile 8-pin SOIC package to save
system space.
FEATURES
Ideal for DDR-I and DDR-II
8-pin SOIC package
Source and sink up to 1.5A, no heat sink required
Integrated power MOSFETs
Programmable output voltage by external resistors
Output voltage could go down to 0.6V
Iccq at VCCA ~ 230uA
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
1
2
3
4
VIN
VOUT
REFEN
VCCA
GND
GND
GND
GND
8
7
6
5
2006/10/11
Rev. 1.2
Champion Microelectronic Corporation
Page 1
CM8561
1.5A S
INK
& S
OURCE
A
DJUSTABLE
L
INEAR
B
US
T
ERMINATOR
PIN DESCRIPTION
Pin No.
1
2
5,6,7,8
3
4
VIN
VOUT
GND
REFEN
VCCA
Symbol
Input Power
Output Voltage
Ground
Reference Voltage Input and Chip Enable
Voltage supply for internal circuits
VCCA-1.9
6
V
V
Description
Min.
Operating Rating
Typ.
Max.
2.5/1.8
6
6
Unit
V
V
ORDERING INFORMATION
Part Number
CM8561IS
CM8561GIS*
*Note:
Add suffix “G” for Pb Free Product
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
APPLICATION CIRCUITS
VCCA
VIN
R1
100k
VCCA
VIN
CIN
470uF
CVCCA
10uF
GND
REFEN
VOUT
COUT
200uF
VOUT
EN
Q1
R2
100k
CSS
1uF
2006/10/11
Rev. 1.2
Champion Microelectronic Corporation
Page 2
CM8561
1.5A S
INK
& S
OURCE
A
DJUSTABLE
L
INEAR
B
US
T
ERMINATOR
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the
device could be permanently damaged.
VIN, VCCA
…….....................................…....……………..7V
Output RMS Current, Source or Sink .....…………........…...1.5A
Storage Temperature ……................……. -65°C to 125°C
Lead Temperature (Soldering, 5 sec)……………….. 260°C
Thermal Resistance(
θ
JC
)….. ……..………….. .15.7°C/W
(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)
CM8561
Min.
-20
0.8/1.2
0.8/1.2
190
90
2.5/1.8
3.15
3.3
5
Sinking
Sourcing
3.15V<=VCCA<=6V
1.5
1.5
125
25
VREFEN < VIN
VREFEN < VCCA – 1.9V
150
30
155
35
Typ.
Max.
20
1
2/3
2/3
230
110
6
6
ELECTRICAL CHARACTERISTICS
Symbol
V
OS
I
OP
½ΔV
LOAD
½
I
CCQ
I
SHDN
V
IN
V
CCA
I
LIMIT
I
SC,VIN
I
SC,GND
THSD
Parameter
Output Offset Voltage
Operating Current at VIN
Load Regulation (DDR I/II)
Quiescent Current at V
CCA
Current in Shutdown Mode
Input Voltage Range (Note 3)
Input Voltage Range (Note 3)
Current Limit
Short Current
Short Current
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Test Conditions
I
OUT
=0A (Note 2)
No load, Cout=200uF
I
L
: 0A -> 1.5A
I
L
: 0A -> -1.5A
At Room Temp.
REFEN<0.2V, R
L
= 10
Ohm
No Load
R
L
= 10 Ohm
Unit
mV
mA
%
%
µA
µA
V
V
A
A
A
℃
℃
SHORT CIRCUIT PROTECTION
OVER THERMAL PROTECTION
REFEN FUNCTION
REFEN Threshold
0.4
0.5
0.6
V
Note 1:
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions
Note 2:
VOS = VREFEN – VOUT
Note 3:
Keep VCCA >= VIN and VCCA >= VREFEN + 1.9V on operation power on and power off sequences
Note 4:
Guaranteed by design, not 100% test
2006/10/11
Rev. 1.2
Champion Microelectronic Corporation
Page 3
CM8561
1.5A S
INK
& S
OURCE
A
DJUSTABLE
L
INEAR
B
US
T
ERMINATOR
FUNCTIONAL DESCRIPTION
The CM8561 is a linear regulator that is capable of sinking
and sourcing 1.5A of current without an external heat sink.
The CM8561 integrates power MOSFETs that are capable of
source and sink 1.5A 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 CM8561, 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 CM8561.
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.
PACKAGE DIMENSION
8-Pin SOP (S08)
PIN 1 ID
θ
θ
2006/10/11
Rev. 1.2
Champion Microelectronic Corporation
Page 4
CM8561
1.5A S
INK
& S
OURCE
A
DJUSTABLE
L
INEAR
B
US
T
ERMINATOR
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue
any integrated circuit product or service without notice, and advises its customers to obtain the latest version of
relevant information to verify, before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe
property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or
warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of
CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks
associated with the customer’s applications, the customer should provide adequate design and operating
safeguards.
HsinChu Headquarter
5F, No. 11, Park Avenue II,
Science-Based Industrial Park,
HsinChu City, Taiwan 300
T E L : +886-3-567 9979
F A X : +886-3-567 9909
http://www.champion-micro.com
Sales & Marketing
7F-6,
No. 32, Sec. 1,
Chenggong
Rd.,
Nangang District , Taipei City 115 , Taiwan
T E L : +886-2-2788
0558
F A X : +886-2-2788
2985
2006/10/11
Rev. 1.2
Champion Microelectronic Corporation
Page 5
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