Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UR6512
LINEAR INTEGRATED CIRCUIT
2A DDR BUS TERMINATION
REGULATOR

DESCRIPTION
The UR6512 is a linear regulator providing up to 2A for DDR
1/DDR 2 and 1.5A for DDR 3 transient peak current and has
sourcing and sinking capability for DDR SDRAM bus terminator
applications while regulating an output voltage to within 20mV. It
contains a high speed operational amplifier which provides fast load
transient response and only requires 10uF of ceramic output
capacitance.
The UR6512 output termination voltage tracks the reference
voltage applied at VREF pin. A resistor divider connected to VIN, GND
and VREF pins is used to force the reference voltage to VREF pin.
Additional features include current limiting protection and thermal
shutdown protection.

FEATURES
* DDR1/ DDR2/DDR3 Termination Voltage Applications
* 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
UR6512G-SH2-T
UR6512G-SH2-R

Package
HSOP-8
HSOP-8
Packing
Tube
Tape Reel
MARKING
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UR6512

LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
VIN
1
8
NC
GND
2
7
NC
VREF
3
6
VCNTL
VOUT
4
5
NC
GND

PIN DESCRIPTION
PIN NO
1
2
3
4
6
5,7,8

PIN NAME
VIN
GND
VREF
VOUT
VCNTL
NC
PIN TYPE
I
O
I
O
I
--
PIN DESCRIPTION
Power supply pin for the VOUT output
Ground pin
Reference voltage input and active-low shutdown control pin
Output voltage pin
Power supply pin for the internal control circuits
No connect
BLOCK DIAGRAM
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
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
VCNTL Control Voltage
VCNTL
6
V
VIN Supply Voltage
VIN
6
V
Power Dissipation (TA=25°C)
PD
1.176
W
Junction Temperature
TJ
125
°C
Storage Temperature
TSTG
-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
Junction to Ambient (Note)
Junction to Case

SYMBOL
θJA
θJC
RATINGS
86
15
UNIT
°C/W
°C/W
RECOMMENDED OPERATING CONDITIONS (Note 1)
PARAMETER
SYMBOL
RATINGS
VCNTL Control Voltage
VCNTL
(3.3 or 5) ±5%
VIN Supply Voltage
VIN
(1.5 ~ 2.5) ±3%
VREF Input Voltage
VREF
(0.75 ~ 1.25) ±3%
Junction Temperature
TJ
-40~+125
Notes: 1. All voltage values are with respect to the network ground terminal unless otherwise noted.
2. The VOUT tracks the VREF with additional voltage offset and load regulation.

UNIT
V
V
V
°C
ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified)
(VIN=1.8V, VCNTL=5V, VREF=0.9V, COUT = 10µF (Ceramic))
PARAMETER
SYMBOL
INPUT CURRENT
Operation Current of VCNTL
ICNTL
Standby Current
ISTB
OUTPUT VOLTAGE (DDR/DDR II/DDR III)
Output Voltage Offset (VREF-VOUT)
VOS
Load Regulation
∆VLOAD
TEST CONDITIONS
MIN
IOUT =0A
VREF<0.2V, RLOAD=180Ω
IOUT =0A
DDR1/DDR2: IOUT =±1.8A
DDR3: IOUT =±1.5A
-20
-20
-20
VIN=2.5V/1.8V
VIN=1.5V
VCNTL=5V
VCNTL=5V
2
1.5
125
Enable
Shutdown
0.6
TYP
MAX
UNIT
1
2
2.5
90
mA
μA
20
20
20
mV
mV
mV
PROTECTION
Current Limit
ILIMIT
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
VREF Shutdown
TSD
∆TSD
Shutdown Threshold
VIH
VIL
UNISONIC TECHNOLOGIES CO., LTD
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A
A
°C
°C
170
35
0.15
V
V
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TYPICAL APPLICATIONS CIRCUIT
2.5V/1.8V
1
VIN
NC
8
2
GND
NC
7
3
VREF
VCNTL
6
5V
CIN
R1
R2
CSS
VOUT
CCNTL
4
VOUT
NC
5
COUT
R1=R2=100KΩ, COUT=10μF(Ceramic)+1000μF under the worst case testing condition
CSS=1μF, CIN=470μF(Low ESR), CCNTL=47μF
R2
VREF =
VIN ( V ) , VOUT track VREF
R1 + R 2
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS

Output Short Circuit Protection
Output Short Circuit Protection
Output Short Current (A)
5
4
3
2
1
6
Output Short Current (A)
Source
VIN=2.5V VCNTL=5V
6
5
4
3
2
1
0
0
Time(1ms/ Div)
Time(1ms/ Div)
Output Short Circuit Protection
Output Short Current (A)
5
4
3
2
1
Output Short Circuit Protection
6
Output Short Current (A)
Source
VIN=1.8V VCNTL=5V
6
5
4
3
2
1
Time(1ms/Div)
Time(1ms/Div)
50
VIN=2.5V,VCNTL=5V,VOUT=1.25V
0
-50
[email protected] Transient Response
Output Voltage
Transient (mV)
[email protected] A Transient Response
Output Voltage
Transient (mV)
Sink
VIN=1.8V VCNTL=5V
0
0
Output Current
(A)
1
0
-1
-2
50
VIN=1.8V,VCNTL=5V,VOUT=0.9V
0
-50
2
2
Output Current
(A)
Sink
VIN=2.5V VCNTL=5V
Time(200us/ Div)
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1
0
-1
-2
Time(200us/Div)
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Output Voltage (V)
TYPICAL CHARACTERISTICS(Cont.)
Output Voltage (V)

LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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