UNISONIC TECHNOLOGIES CO., LTD
UR6515C
2A DDR BUS TERMINATION
REGULATOR
DESCRIPTION
The
UR6515C
is a linear regulator providing up to 2A transient
peak current sourcing and sinking capability for DDR SDRAM bus
terminator applications while regulating an output voltage to within
40mV. It contains a high speed operational amplifier which provides
fast load transient response and only requires 10uF of ceramic
output capacitance.
The
UR6515C
output termination voltage tracks the reference
voltage applied at V
REF
pin. A resistor divider connected to V
IN
, GND
and V
REF
pins is used to force the reference voltage to V
REF
pin.
Additional features include current limiting protection and thermal
shutdown protection.
LINEAR INTEGRATED CIRCUIT
FEATURES
*DDR1/ DDR2/DDR3 termination voltage applications
*Sink and Source Current
2A Contious Current
*Adjustable output voltage by external resistors
*Integrated power MOS devices
*Suspend to RAM(STR) functionality
*Current Limiting Protection
*Thermal Shutdown Protection
*Cost-effective and easy to use
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UR6515CL-SH2-R
UR6515CG-SH2-R
UR6515CL-SH2-T
UR6515CG-SH2-T
Package
HSOP-8
HSOP-8
Packing
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
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QW-R101-038.A
UR6515C
PIN CONFIGURATIONS
V
IN
GND
V
REF
V
OUT
1
2
GND
3
4
LINEAR INTEGRATED CIRCUIT
8
7
6
5
NC
NC
V
CNTL
NC
PIN DESCRIPTION
PIN NAME
V
CNTL
GND
V
IN
V
REF
V
OUT
PIN TYPE
I
-
I
I
O
PIN DESCRIPTION
Power supply pin for the internal control circuits
Ground pin
Power supply pin for the V
OUT
output
Reference voltage input and active-low shutdown control pin
Output voltage pin
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UR6515C
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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UR6515C
ABSOLUTE MAXIMUM RATING
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
V
CNTL
Control Voltage
V
CNTL
+6
V
V
IN
Supply Voltage
V
IN
+6
V
Power Dissipation (T
A
=25°C)
P
D
1.33
W
Junction Temperature
T
J
125
°C
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
Junction to Ambient (Note 1)
θ
JA
75
°C/W
Junction to Case
θ
JC
28
°C/W
Note: 1.
θ
JA
is measured in the natural convection at T
A
= 25°C on a high effective thermal conductivity test board of
JEDEC 51-7 thermal measurement standard
RECOMMENDED OPERATING CONDITIONS
(Note 1)
PARAMETER
SYMBOL
RATINGS
V
CNTL
Control Voltage
V
CNTL
5 or 3.3±5%
V
IN
Supply Voltage
V
IN
2.5~1.5±3%
V
REF
Input Voltage
V
REF
1.25~0.75±3%
Junction Temperature
T
J
-40~+125
Notes: 1. All voltage values are with respect to the network ground terminal unless otherwise noted.
2. The V
OUT
tracks the V
REF
with additional voltage offset and load regulation.
UNIT
V
V
V
°C
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified)
(V
IN
=2.5V/1.8V/1.5V, V
CNTL
=3.3V, V
REF
=1.25V/0.9V/0.75V, C
OUT
= 10µF (Ceramic))
PARAMETER
SYMBOL
TEST CONDITIONS
INPUT CURRENT
Operation Current of V
CNTL
I
CNTL
I
OUT
=0A
Standby Current
I
STB
V
REF
<0.2V,
R
LOAD
=180Ω
OUTPUT VOLTAGE (DDR/DDR II/DDR III)
Output Voltage Offset (V
REF
-V
OUT
)
V
OS
I
OUT
=0A
Load Regulation
ΔV
LOAD
I
OUT
=±2A
PROTECTION
Current Limit
I
LIMIT
V
IN
=2.5V/1.8V/1.5V
Thermal Shutdown Temperature
T
SD
V
CNTL
=3.3V~5V
Thermal Shutdown Hysteresis
ΔT
SD
V
CNTL
=3.3V~5V
V
REF
Shutdown
Enable
V
IH
Shutdown Threshold
V
IL
Shutdown
MIN
TYP
1
50
-20
-20
2.2
125
MAX
2.5
90
20
20
UNIT
mA
μA
mV
mV
A
°C
°C
V
V
170
35
0.6
0.2
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UR6515C
TYPICAL APPLICATIONS CIRCUITS
LINEAR INTEGRATED CIRCUIT
R
1
=R
2
=100KΩ, C
OUT
=10μF(Ceramic)+1000μF under the worst case testing condition
C
SS
=1μF, C
IN
=470μF(Low ESR), C
CNT
L
=47μF
R
2
V
REF
=
V
IN
( V )
, V
OUT
track V
REF
R
1
+ R
2
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www.unisonic.com.tw
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