Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UR5515
CMOS IC
1.5A/3A BUS TERMINATION
REGULATOR
SOP-8
DESCRIPTION
The UTC UR5515 is a linear bus termination regulator and
designed to convert voltage supplies ranging from 1.6V~6.0V into a
desired output voltage, which adjusted by two external voltage
divider resistors. The device can both source and sink up to 1.5A/3A
of current while regulating an output voltage to within 2% (DDR-I)
and 3% (DDR-II) or less.
The UTC UR5515 is capable of use in conjunction with series
termination resistors to provide an excellent voltage source for active
termination schemes of high speed transmission lines as those seen
in high speed memory buses and distributed backplane designs.
The voltage output of the regulator can be used as a termination
voltage for DDR SDRAM.
1
1
TO-252-5
TO-263-5
*Pb-free plating product number: UR5515L
FEATURES
* Support Both DDR-I (1.25 VTT) and DDR-II (0.9 VTT) Requirements
* Capable of Sourcing and Sinking Current 1.5A/3A
* Current-limiting Protection and Thermal Shutdown Protection
* Integrated Power MOSFETs
* Generates Termination Voltages for SSTL-2
* High Accuracy Output Voltage at Full-Load
* Adjustable output voltage by External Resistors
* Minimum External Components
* Shutdown for Standby or Suspend Mode Operation with
High-impedance Output.
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UR5515-S08-R
UR5515L-S08-R
UR5515-S08-T
UR5515L-S08-T
UR5515-TN5-R
UR5515L-TN5-R
UR5515-TN5-T
UR5515L-TN5-T
UR5515-TQ5-R
UR5515L-TQ5-R
UR5515-TQ5-T
UR5515L-TQ5-T
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Copyright © 2005 Unisonic Technologies Co., LTD
Package
Packing
SOP-8
SOP-8
TO-252-5
TO-252-5
TO-263-5
TO-263-5
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
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UR5515
CMOS IC
PIN DESCRIPTION
PIN NO.
SOP-8
1
2
5,6,7,8
3
4
TO-252-5/TO-263-5
1
2
3
4
5
PIN NAME
VIN
GND
VCNTL
VREF
VOUT
DESCRIPTION
Input Voltage
Ground
Gate Drive Voltage
Reference Voltage Input and Chip Enable
Output Voltage
BLOCK DIAGRAM
VCNTL
VREF
Current
Limiting
Sensor
CNTL
VIN
VOUT
Thermal
GND
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CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
7
V
Power Dissipation
PD
Internally Limited
W
℃
Junction Temperature
TJ
125
℃
Storage Temperature Range
TSTG
-40 ~ 150
Note:1.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.
2.The device is guaranteed to meet performance specification within 0℃~70℃ operating temperature range
and assured by design from –20℃~85℃.
ELECTRICAL CHARACTERISTICS
(Ta = 25℃, unless otherwise specified: VIN = 2.5V, VCNTL= 3.3V, VREF = 1.25V, COUT=10µF(Ceramic).)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
DDR-I
1.6
2.5
VIN
DDR-II
1.8
Input Voltage Range(Note 1)
No Load,(Note 2)
DDR-I
3.3
6
VCNTL
DDR-II
3.3
6
Output Offset Voltage
VOS
IOUT=0A, Fig. 1 (Note 3)
-20
0
20
Operating Current of VCNTL
ICNTL
No Load
6.5
10
DDR-I
0.8
2
IL: 0~1.5A, Fig. 1
DDR-II
1.2
3
|△VLOAD|
Load Regulation
DDR-I
0.8
2
IL: 0~-1.5A, Fig. 1
DDR-II
1.2
3
Current In Shutdown Mode
ISHDN VREF<0.2V, RL=180Ω, Fig. 2
50
90
Short Circuit Protection
UR5515
Fig 3, 4
2.1
Current Limit
ILIMIT
UR5515A
Fig 3, 4
3.0
Over Temperature Protection
Thermal Shutdown Temperature
TSD
3.3V≤VCNTL≤5V
125
150
Thermal Shutdown Hysteresis
50
Shutdown Function
Shutdown Threshold Voltage
VTHD
Fig 5
0.2
0.8
Note 1. For safely operate your system, the 3.3V rail have to be tied to VCNTL rather than 5V rail
2. Keep VCNTL≥VIN on operation power on and power off sequences.
3. VOS offset is the voltage measurement defined as VOUT subtracted from VREF.
UNIT
V
mV
mA
%
µA
A
℃
℃
V
THERMAL DATA
PARAMETER
Thermal Resistance Junction-Case
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
SYMBOL
SOP-8
TO-252-5
TO-263-5
θJC
RATINGS
35
8
4
UNIT
℃/W
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CMOS IC
TEST CIRCUITS
2.5 V
3.3V
VIN
VCNTL
VREF
1.25V
2.5V
VIN
VOUT
UTC
VOUT
UR5515
GND
I L COUT
1.25V
0.2V
V
1.25V
3.3V
VIN
VCNTL
VREF
UTC
UR5515 VOUT
GND
A
Power supply
with current limit
2.5V
VIN
VOUT
1.25V
V
Fig 3. Current Limit for HIgh Side, I CLHIGH
RL
1.25V
V
0V
R Land COUT
Time delay
VREF
A
3.3V
IL
VCNTL
UTC
VOUT
UR5515
VOUT
V
GND
COUT
Fig 4. Current Limit for Low Side, ICLLOW
3.3V
2.5V
VIN
1.25V
VREF 0.2V
VREF
VCNTL
UTC
UR5515 VOUT
1.25V
0V
VOUT
Fig 2. Current in Shutdown Mode, ISHCLN
IL COUT
VOUT
VCNTL
UTC
UR5515
VOUT
VREF
GND
COUT
Fig1. Output Voltage Tolerance , △ VOUT
2.5V
3.3V
V
GND
VOUT
RL
V
COUT
VOUT would be low if VREF < 0.2V
VOUT would be high if VREF > 0.8V
RL and COUT
Time delay
Fig 5. VREF Pin Shutdown Threshold Voltage
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CMOS IC
TYPICAL APPLICATION CIRCUIT
R1= R2= 100KΩ
COUT(min)=10µF(Ceramic) + 1000µF under the worst case testing condition
CSS=1µF, CIN = 40µF(low ESR), CCNTL= 47µF
APPLICATIONS INFORMATION
Please note the point of thermal shutdown will be degraded by around 20℃while VCNTL equal to 5V compared
with 3.3V. It is highly recommended that to use the 3.3V rail acted as the VCNTL in SOP-8 package. Nevertheless,
this small footprint of PCB for plastic SOP-8 package is not enough to dissipate effectively the heat generated
when operating at high current levels. In order to control die operating temperatures, the PCB layout should allow
for maximum possible copper area at the four VCNTL pins. Besides, an appropriate power plane heat sink must be
used to prevent overstepping maximum junction temperature. The recommended SMT is as below.
The PCB heat sink copper area should be
solder painted without masked. This
approaches a "best case " pad heat sink .
Use vias to conduct the heat into the
buried or backside of PCB layer.
UTC UR5515
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
(SOP-8)
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UR5515
CMOS IC
TYPICAL CHARACTERISTICS
8.0
8.0
7.0
7.0
6.0
6.0
5.0
4.0
3.0
2.0
VCNTL =3.3V
VIN =2.5V
VOUT=1.25V
1.0
0.0
-40 -20
0
20
40
60
80
5.0
4.0
3.0
2.0
0.0
-40 -20
100 120
600
550
500
450
400
-40 -20
80
100 120
VCNTL=3.3V
VIN=2.5V
0
20
40
60
80
100 120
600
550
500
450
400
-40 -20
Temperature (℃)
T
-50
T
0
-1
-2
Time (250μS /Div)
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Output Current (A)
VCNTL =3.3V
Swing Frequency =1kHz
VREF =1.25V
50 VIN =2.5V
0
20
40
60
80
100 120
1.25VTT @ 3A Transient Response
Output Transient
Voltage (mV)
100
VCNTL=5.0V
VIN=2.5V
Temperature(℃)
1.25VTT @1.5A Transient Response
Output Transient
Voltage (mV)
60
Turn-On Threshold vs. Temperature
650
Output Current (A)
40
Turn -On Threshold vs. Temperature
650
1
20
Temperature (℃)
700
2
0
Temperature (℃)
700
0
V CNTL=3.3V
VIN =2.5V
VOUT=1.25V
1.0
Th reshold Voltage (mV)
Threshold Voltage (mV)
Sinking Current (Peak) vs. Temperature
Sinking Current (A)
Sourcing Current (A)
Sourcing Current(Peak) vs. Temperature
100
V REF=1.25V
50 VIN=2.5V
0
-50
VCNTL = 3.3V
Temperature
(?
Swiing Frequency=1kHz
T
4
2 T
0
-2
-4
Time (250μS /Div)
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CMOS IC
TYPICAL CHARACTERISTICS (cont.)
0.9VTT @3A Transient Response
VCNTL= 3.3V
Swiing Frequency=1kHz
VREF = 0.9V
50 VIN =1.8V
0
T
-50
Output Current (A)
2
T
1
Output Transient
Voltage (mV)
100
Output Current (A)
Output Transient
Voltage (mV)
0.9VTT @1.5A Transient Response
0
-1
100
0
T
-50
4
2
T
0
-2
-4
-2
Time (250μS/Div)
Time (250μS/Div)
Temperature vs. RDS (ON)
Temperature vs. R DS (ON)
0.32
V IN =0.9V
V
=5.0V
0.31 VCNTL=1.0V
REF
0.30
VIN=0.85V
0.28
0.27
VIN =0.8V
0.26
0.25
RDS (ON) (Ω)
0.31
V
=3.3V
0.30 VCNTL=1.0V
REF
0.29
RDS (ON) (Ω)
VCNTL = 3.3 V
Swiing Frequency=1kHz
V REF=0.9V
50 VIN =1.8V
0.29
0.28
VIN=0.8V
0.27
0.26
0.24
0.25
0.23
0.24
0.22
25 35 45 55 65 75 85 95 105 115 125
0.23
25 35 45 55 65 75 85 95 105 115 125
Temperature (℃)
Temperature (℃)
Output Short-Circuit Protection
10
8
Sink
T
VIN=2.5V
V CNTL=3.3V
V REF=1.25V
6
4
2
0
-2
-4
Output Short-Circuit Protection
12
10
Output Short Circuit (A)
12
Output Short Circuit (A)
VIN =0.9V
VIN=0.85V
8
Source
T
VIN=2.5V
V CNTL=3.3V
V REF =1.25V
6
4
2
0
-2
Force the output shorted to VDDQ
Time (5mS/Div)
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-4
Force the output shorted to VDDQ
Time (5mS/Div)
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CMOS IC
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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