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UNISONIC TECHNOLOGIES CO., LTD UR5515
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.
CMOS IC
1
TO-252-5
1
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 Package SOP-8 SOP-8 TO-252-5 TO-252-5 TO-263-5 TO-263-5 Packing Tape Reel Tube Tape Reel Tube Tape Reel Tube
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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
CMOS IC
BLOCK DIAGRAM
VCNTL
VIN
VREF
Current Limiting Sensor Thermal
CNTL
VOUT GND
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ABSOLUTE MAXIMUM RATINGS
CMOS IC
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=10F(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=180, 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 3.3VVCNTL5V 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 VCNTLVIN 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 % A A
V
THERMAL DATA
PARAMETER Thermal Resistance Junction-Case SOP-8 TO-252-5 TO-263-5 SYMBOL
JC
RATINGS 35 8 4
UNIT /W
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TEST CIRCUITS
2.5V 3.3V
CMOS IC
2.5 V VIN 1.25V
3.3V VCNTL
V VIN
VREF
UTC VOUT UR5515 GND
VOUT V
1.25V 0.2V
VCNTL UTC UR5515 VOUT VREF GND
VOUT RL
1.25V V 0V R Land COUT Time delay
I L COUT
COUT
Fig1. Output Voltage Tolerance ,
VOUT
Fig 2. Current in Shutdown Mode, ISHCLN
2.5V VIN 1.25V VREF
3.3V VCNTL
UTC UR5515 VOUT GND A
VOUT V
Power supply with current limit 2.5V VIN 1.25V VREF
IL COUT
A 3.3V IL VCNTL UTC VOUT UR5515 VOUT V GND COUT
Fig 3. Current Limit for HIgh Side, I CLHIGH
Fig 4. Current Limit for Low Side, ICLLOW
2.5V VIN 1.25V VREF 0.2V 1.25V VOUT 0V VREF
3.3V VCNTL UTC UR5515 VOUT GND RL VOUT V COUT
RL and COUT Time delay
VOUT would be low if VREF < 0.2V VOUT would be high if VREF > 0.8V
Fig 5. VREF Pin Shutdown Threshold Voltage
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TYPICAL APPLICATION CIRCUIT
CMOS IC
R1= R2= 100K COUT(min)=10F(Ceramic) + 1000F under the worst case testing condition CSS=1F, CIN = 40F(low ESR), CCNTL= 47F
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 Use vias to conduct the heat into the buried or backside of PCB layer. solder painted without masked. This approaches a "best case " pad heat sink .
UTC UR5515
(SOP-8)
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TYPICAL CHARACTERISTICS
Sourcing Current(Peak) vs. Temperature 8.0 7.0
Sourcing Current (A) Sinking Current (A)
CMOS IC
Sinking Current (Peak) vs. Temperature 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 -40 -20 0 20 40 60 V CNTL =3.3V VIN =2.5V VOUT=1.25V 80 100 120
6.0 5.0 4.0 3.0 2.0 1.0 0.0 -40 -20 0 20 40 60 VCNTL =3.3V VIN =2.5V VOUT=1.25V 80 100 120
Temperature ( )
Temperature ( )
Turn -On Threshold vs. Temperature 700 650
Threshold Voltage (mV)
Turn-On Threshold vs. Temperature 700 650
Th reshold Voltage (mV)
600 550 500 450 400 -40 -20 0 20 40 60 VCNTL=3.3V VIN=2.5V 80 100 120 Temperature ( )
600 550 500 450 400 -40 -20 0 20 40 60 VCNTL=5.0V VIN=2.5V 80 100 120 Temperature( )
1.25VTT @1.5A Transient Response
Output Transient Voltage (mV) Output Transient Voltage (mV)
1.25VTT @ 3A Transient Response 100 V REF=1.25V 50 VIN=2.5V 0 -50 4 2T 0 -2 -4 Time (250 S /Div) T VCNTL = 3.3V Temperature ( Swiing Frequency=1kHz
100
VREF =1.25V 50 VIN =2.5V 0 T
VCNTL =3.3V Swing Frequency =1kHz
-50 2 1 0 -1 -2 Time (250 S /Div) T
Output Current (A)
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Output Current (A)
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TYPICAL CHARACTERISTICS (cont.)
0.9VTT @1.5A Transient Response
Output Transient Voltage (mV)
CMOS IC
0.9VTT @3A Transient Response
Output Transient Voltage (mV)
100
VREF = 0.9V 50 VIN =1.8V 0 T
VCNTL= 3.3V Swiing Frequency=1kHz
100
V REF=0.9V 50 VIN =1.8V 0 T
VCNTL = 3.3 V Swiing Frequency=1kHz
-50 2 1 0 -1 -2 Time (250 S/Div) T
-50 4 2 0 -2 -4 Time (250 S/Div) T
Output Current (A)
Output Current (A)
Temperature vs. R DS (ON) 0.31 V =3.3V 0.30 VCNTL REF =1.0V 0.29
RDS (ON) ( )
Temperature vs. RDS (ON) 0.32 V =5.0V 0.31 VCNTL REF =1.0V 0.30
RDS (ON) ( )
V IN =0.9V VIN=0.85V
VIN =0.9V VIN=0.85V
0.28 0.27 0.26 0.25 0.24 0.23 0.22 25 35 45 55 65 75 85 95 105 115 125 Temperature ( ) VIN =0.8V
0.29 0.28 0.27 0.26 0.25 0.24 0.23 25 35 45 55 65 75 85 95 105 115 125 Temperature ( ) VIN=0.8V
Output Short-Circuit Protection 12 10
Output Short Circuit (A)
Output Short-Circuit Protection 12 10
Output Short Circuit (A)
Sink T
8 6 4 2 0 -2 -4
VIN=2.5V V CNTL=3.3V V REF=1.25V
Source T
8 6 4 2 0 -2
VIN=2.5V V CNTL=3.3V V REF =1.25V
Force the output shorted to VDDQ Time (5mS/Div)
-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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