CM8501/A
1.5A B
US
T
ERMINATOR
GENERAL DESCRIPTION
The CM8501/A is a low cost switching regulator designed to
provide a desired output voltage or termination voltage for
various applications by converting voltage supplies ranging
from 2.0V to 4.0V. The CM8501 can be implemented to
produce regulated output voltages in two different modes. In
the default mode, when the VIN/2 pin is open, the output
voltage is 50% of the VCCQ. The CM8501 can also be used
to produce various user-defined voltages by forcing a voltage
on the VIN/2 pin. In this case, the output voltage follows the
VIN/2 pin input voltage. The regulated output voltage of
CM8501A is internally set to be 50% of the applied VCCQ.
The switching regulator is capable of sourcing or sinking up to
1.5A of current while regulating an output V
TT
voltage to
within 3% or less.
The CM8501A could guarantee to provide continuous
sinking or sourcing up to 2A current while enlarging the
layout GND pad dimension as layout suggestion in page
6.
The CM8501/A provides low profile 8-pin PSOP package to
save system space as well as 16-pin PSOP and PTSSOP
packages that are pin-to-pin compatible to the previous
CM8500.
FEATURES
Patent Filed #6,452,366
8-pin PSOP, 16 pin PTSSOP and 16 pin PSOP power
packages
Source and sink up to 1.5A, no heat sink required
Peak Current to 3A
Integrated Power MOSFETs
Output voltage can be programmed by external resistors
(CM8501)
Separate voltages for VCCQ and PVDD
V OUT of ±3% or less at 1.5A
Minimum external components
Shutdown for standby or suspend mode operation
Thermal shutdown protection
Soft start
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
APPLICATIONS
Mother Board
PCI/AGP Graphics
Game/ Play Station
Set Top Box
IPC
SCSI-III Bus terminator
Buck Converter
2005/02/02
Rev. 1.2
Champion Microelectronic Corporation
Page 1
CM8501/A
1.5A B
US
T
ERMINATOR
PIN CONFIGURATION
PSOP-16 (PS16)/PTSSOP-16 (PT16)
Top View
1
2
3
4
PSOP-8 (PS08)
Top View
VCCA
VCCQ
AGND
SD
PVDD
VL
PGND
VFB
8
7
6
5
1
2
3
4
5
6
7
8
VCCA
NC
NC
NC
AGND
SD
VIN/2
AGSEN
NC
PVDD
VL
PGND
NC
VFB
VCCQ
NC
16
15
14
13
12
11
10
9
PIN DESCRIPTION
Pin No.
8501
8501A
1
2,3,4,9,12,16
5
6
1
--
3
4
Symbol
VCCA
NC
AGND
SD
Description
Voltage supply for internal circuits
No Connection
Ground for internal reference voltage divider
CMOS input level
Shutdown level
Enable level
0.75 x VCCA
0
VCCQ/2
VCCA+0.3
2.0
V
V
Min.
2
Operating Rating
Typ.
Max.
2.5
5.5
Unit
V
7
8
10
11
13
14
15
--
--
2
5
6
7
8
VIN/2
Input for external reference voltage
AGSEN
Ground for remote sensing
VCCQ
VFB
PGND
VL
PVDD
Voltage reference for external voltage divider
Feedback node for the V
TT
Ground for output power transistors
Output voltage/inductor connection (IDD1+IDD2,
Output RMS current)
Voltage supply for output power transistors
2
2.5
5.5
V
-2.0
+2.0
A
2.5
VCCQ/2
V
V
ORDERING INFORMATION
Part Number
CM8501IT
CM8501IS
CM8501AIS
CM8501GIT*
CM8501GIS*
CM8501AGIS*
*Note:
G : Suffix for Pb Free Product
Temperature Range
-40℃ to 85℃
-40℃ to 85℃
-40℃ to 85℃
-40℃ to 85℃
-40℃ to 85℃
-40℃ to 85℃
Package
16-Pin PTSSOP (PT16)
16-Pin PSOP (PS16)
8-Pin PSOP (PS08)
16-Pin PTSSOP (PT16)
16-Pin PSOP (PS16)
8-Pin PSOP (PS08)
2005/02/02
Rev. 1.2
Champion Microelectronic Corporation
Page 2
CM8501/A
1.5A B
US
T
ERMINATOR
BLOCK DIAGRAM
SD
4
AGND
3
VCCQ
2
VCCA
1
OSCILLATOR
RAMP GENERATOR
100K
100K
S
Q
-
R
Q
ERROR AMP
+
-
+
RAMP AMP
COMPARATOR
THERMO-
20PF
PROTECTION
5
VFB
6
PGND
7
VL
8
PVDD
BLOCK DIAGRAM- 8 PIN
AGSEN
8
VIN/2
7
SD
6
AGND
5
NC
4
NC
3
NC
2
VCCA
1
OSCILLATOR/
RAMP GENERATOR
100K
S
-
Q
R
ERROR AMP
+
RAMP AMP
COMPARATOR
Q
+
-
100K
THERMAL
20PF
PROTECTION
9
NC
10
VCCQ
11
VFB
12
NC
13
PGND
14
VL
15
PVDD
16
NC
BLOCK DIAGRAM- 16 PIN
2005/02/02
Rev. 1.2
Champion Microelectronic Corporation
Page 3
CM8501/A
1.5A B
US
T
ERMINATOR
APPLICATION CIRCUITS
1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT
VDD
VCC
C1
100uf/6.3V
NOTE:
JP3---->USEING INTERNAL REFERENCE
SOURCE(PIN 1, 2 SHORT)
JP3---->USEING EXTERNAL REFERENCE
SOURCE(PIN 2,3 SHORT)
R4
1k
2
1
1
JP1
JUMPER
5
J1
PWR/IN
TP1
BNC
1
D1
SK12
2
4
C2
105
R1
100k
1
R2
1k
2
C3
470
1
3
PGND
L1
3.3uH
2
D2
SK12
8
7
6
5
C8
10uf/6.3V
VDD
VL
FB
2
U2
CM-431
1
3
AGND
VCCQ
2
1
U1
C7
104
CM8501
C6
220uf/6.3V
VCC
J2
VTT
1
2
SD
1
2
3
4
JP3
1
2
3
J3
VREF-OUT
VCC
R6
5R1
1
C4
105
2
1
2
JP2
JUMPER
R5
0
VDD
C5
104
2
1
R3
100k
JP4
on/off sw
8-Pin Schematic
1.5A DDR BUS TERMINATOR DEMO BOARD CIRCUIT
VCC
VDD
2
1
J1
PWR/IN
C1 100uf/6.3V
1
2
1
2
NOTE:
R4
1k
R2
1k
R1
100k
C8
10uf/6.3V
JP1
JUMPER
JP3---->USEING INTERNAL REFERENCE
SOURCE(PIN 1, 2 SHORT)
JP3---->USEING EXTERNAL REFERENCE
SOURCE(PIN 2,3 SHORT)
2
C3
470
2
4
3
TP1
BNC
1
D1
SK12
1
C2 105
U2
CM-431
5
1
3
12
11
16
15
14
13
10
9
L1
3.3uH
2
PVDD
VFB
PGND
VCCQ
D2
SK12
NC
VL
NC
NC
JP3
VCCA
NC
NC
J2
VTT
1
2
J3
VREF-OUT
U1
CM8501
1
VCC
R6
5R1
1
2
C4 105
VDD
3
4
5
6
7
2
JP2
JUMPER
2
R5
0
C5
104
C9
102
8
2
R3
100k
1
JP4
ON/OFF SW
16-Pin Schematic
2005/02/02
Rev. 1.2
Champion Microelectronic Corporation
AGSEN
AGND
VIN/2
2
1
C7
104
C6
220uf/6.3V
NC
SD
1
2
3
1
2
Page 4
CM8501/A
1.5A B
US
T
ERMINATOR
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the
device could be permanently damaged.
PVDD/VCCA/VCCQ ......................................….......-0.3V to 4.0V
Voltage on Any Other Pin …………... GND – 0.3V to VCC + 0.3V
Output RMS Current, Source or Sink
.....…………........…...1.5A
Junction Temperature ...…………………… …………150°C
Storage Temperature ……................……. -65°C to 125°C
Lead Temperature (Soldering, 5 sec)……………….. 300°C
16-Pin Package Thermal Resistance(
θ
JA
)….. .. .40°C/W
8-Pin Package Thermal Resistance(
θ
JA
)….….. .50°C/W
OPERATING CONDITIONS
Temperature Range ............................. -40°C to 85°C
P
VDD
Operating Range .........................2.0V to 4.0V
(Unless otherwise stated, these specifications apply T
A
=25°C;
VCCA=+3.3V and PVDD=+3.3V)
maximum ratings are stress ratings only and functional device operation is not implied.
(Note 1)
CM8501/A
Min.
1.12
1.22
1.32
1.09
1.19
1.28
1.139
1.238
1.337
0.9
1.5
135
Typ.
1.15
1.25
1.35
1.15
1.25
1.35
1.15
1.25
1.35
50
1.2
2.0
3
150
250
1.5
Max.
1.18
1.28
1.38
1.21
1.31
1.42
1.162
1.263
1.364
ELECTRICAL CHARACTERISTICS
Symbol
SWITCHING REGULATOR
Parameter
Test Conditions
Unit
IOUT = 0, VCCQ = 2.3V
VCCQ = 2.5V
Note 2
VL
Output Voltage, SSTL_2
IOUT =
±1.5A,
Note 2
Note 3
V
IN
/2
Z
IN
fsw
I
OUT(RMS)
I
OUT(PEAK)
OTS
MOSFETs
RDS
(ON)
SUPPLY
I
VCCA
I
PVDD
Quiescent Current
VFB = 1.4V
LC unconnected
VFB = 1.4V
LC unconnected
Drain to Source on-State Resistance
PVDD=5V
Internal Resistor Divider
V
IN
/2 Reference Pin Input Impedance
Switching Frequency
Minimum Output RMS Current
Maximum Output Peak Current
Over Temperature Shutdown
IOUT = 0
Note 2
Note 2
VCCQ = 2.7V
VCCQ = 2.3V
VCCQ = 2.5V
VCCQ = 2.7V
VCCQ = 2.3V
VCCQ = 2.5V
VCCQ = 2.7V
VCCQ = 0
V
V
V
V
V
V
V
V
V
KΩ
MHz
A
A
℃
mΩ
CM8501/A
CM8501/A
CM8501/A
CM8501/A
220
500
µA
µA
Note 1:
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions
Note 2:
VCCA, PVDD = 3.3V ±10%, VIN/2=open for CM8501
Note 3:
Guaranteed by design, not 100% test
2005/02/02
Rev. 1.2
Champion Microelectronic Corporation
Page 5
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