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UNISONIC TECHNOLOGIES CO., LTD UR6512
2A DDR BUS TERMINATION REGULATOR
DESCRIPTION
The UR6512 is a linear regulator providing up to 2A 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.
LINEAR INTEGRATED CIRCUIT
FEATURES
* DDR1/ DDR2 Termination Voltage Applications * Low Output Voltage Offset within 20mV@1.8A * Source and Sink 2A Peak 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 UR6512G-SH2-R Package HSOP-8 Packing Tape Reel
www.unisonic.com.tw Copyright (c) 2010 Unisonic Technologies Co., Ltd
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PIN CONFIGURATIONS
VIN GND VREF VOUT 1 2 GND 3 4
LINEAR INTEGRATED CIRCUIT
8 7 6 5
NC NC VCNTL NC
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
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (unless otherwise specified)
PARAMETER SYMBOL RATINGS UNIT VCNTL Control Voltage VCNTL 6 V VIN Supply Voltage VIN 6 V Power Dissipation (Ta=25C) 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 JA JC 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 (1.8 ~ 2.5) 3% VREF Input Voltage VREF (0.9 ~ 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=25C, unless otherwise specified)
(VIN=1.8V, VCNTL=5V, VREF=0.9V, COUT = 10F (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 PROTECTION Current Limit ILIMIT Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis TSD VREF Shutdown VIH Shutdown Threshold VIL TEST CONDITIONS IOUT =0A VREF<0.2V, RLOAD=180 IOUT =0A IOUT =1.8A VIN=2.5V/1.8V VCNTL=5V VCNTL=5V Enable Shutdown -20 -20 2 125 MIN TYP 1 2 MAX 2.5 90 20 20 UNIT mA A mV mV A C C V V
170 35
0.6 0.15
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www.unisonic.com.tw
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TYPICAL APPLICATIONS CIRCUIT
2.5V/1.8V
LINEAR INTEGRATED CIRCUIT
1 CIN 2 R1 3 R2 CSS VOUT 4 COUT
VIN
NC
8
5V
GND
NC
7
VREF
VCNTL
6 CCNTL
VOUT
NC
5
R1=R2=100K, COUT=10F(Ceramic)+1000F under the worst case testing condition CSS=1F, CIN=470F(Low ESR), CCNTL=47F R2 VREF = VIN ( V ) , VOUT track VREF R1 + R2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
Output Short Circuit Protection
6 Output Short Current (A) 5 4 3 2 1 0 Time(1ms/ Div) Source VIN=2.5V VCNTL=5V 6
Output Short Current (A)
Output Short Circuit Protection
Sink VIN=2.5V VCNTL=5V
5 4 3 2 1 0
Time(1ms/ Div)
Output Short Circuit Protection
6 Source VIN=1.8V VCNTL=5V 6 Output Short Current (A) 5 4 3 2 1 0
Output Short Circuit Protection
Sink VIN=1.8V VCNTL=5V
Output Short Current (A)
5 4 3 2 1 0
Time(1ms/Div)
Time(1ms/Div)
1.25VTT@1.8 A Transient Response
Output Voltage Transient (mV)
Output Voltage Transient (mV)
0.9VTT@1.8A Transient Response
50 0 -50 2
Output Current (A)
50 0 -50 2
VIN=2.5V,VCNTL=5V,VOUT=1.25V
VIN=1.8V,VCNTL=5V,VOUT=0.9V
Output Current (A)
1 0 -1 -2 Time(200us/ Div)
1 0 -1 -2
Time(200us/Div)
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www.unisonic.com.tw
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TYPICAL CHARACTERISTICS(Cont.)
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.
Output Voltage (V)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Output Voltage (V)
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