Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UR6516B
Preliminary
CMOS IC
2A SINK & SOURCE
ADJUSTABLE LINEAR BUS
TERMINATOR

DESCRIPTION
The UTC UR6516B is a low cost linear regulator providing a
desired output voltage or termination voltage for various applications
by converting voltage supplies ranging from 1V ~ 6.0V. The desired
output voltage could be programmable by two external voltage
divider resistors.
The UTC UR6516B can source or sink up to 2A of current while
regulating an output voltage to within 2% (DDR-I), 3% (DDR-II) or
less.
The UTC UR6516B can be used in applications, such as
PCI/AGP graphics, game/play station, set top box, mother board.

SOP-8
FEATURES
* Ideal for DDR-I ,DDR-II
* Output Voltage could Drop Down to 0.6V
* Source and Sink up to 2A, Without an External Heat Sink
* Integrated Power MOSFETs
* Output Voltage Varies though Adjusting External Resistors
* ICCQ is Lower than 500uA at VCCA
* Thermal Shutdown Protection, Current Limit Protection, and Short
Circuit Protection Circuits Included
* Shutdown for Standby or Suspend Mode Operation
* Requiring Minimum External Components

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UR6516BL-S08-T
UR6516BG-S08-T
UR6516BL-S08-R
UR6516BG-S08-R
Package
Packing
SOP-8
SOP-8
Tube
Tape Reel
UR6516BL-S08-T
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2)Package Type
(2) S08: SOP-8
(3)Halogen Free
(3) L: Lead Free, G: Halogen Free
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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UR6516B


CMOS IC
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO
1
2,7,8
3
4
5
6

Preliminary
PIN NAME
VIN
GND
NC
VOUT
REFEN
VCCA
DESCRIPTION
Input Power
Ground
No Connection
Output Voltage
Reference Voltage Input and Chip Enable
Voltage Supply for Internal Circuits
BLOCK DIAGRAM
VCCA
Current Limit
Protection
REFEN
VIN
Thermal
EA
VOUT
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UR6516B

Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
VIN, VCCA
VIN, VCCA
7
V
Output RMS Current, Source or Sink
2
A
Storage Temperature
TSTG
-65~125
°C
Notes: 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.

OPERRATING RATING
PARAMETER
Input Power
Output Voltage
Reference Voltage Input and Chip Enable
Voltage Supply for Internal Circuits

TEST CONDITIONS
MIN
1
TYP
2.5/1.8/1.5
MAX UNIT
6
V
V
VCCA-1.9
V
VCCA-1.9
6
V
THERMAL DATA
PARAMETER
Junction to Case

SYMBOL
VIN
VOUT
REFEN
VCCA
SYMBOL
θJC
RATINGS
60
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
(TA=25°C; VIN=+2.5V and VCCA=+3.3V, VREFEN=1.25V, unless otherwise specified) (Note 1)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX
Output Offset Voltage (Note 2)
VOS
IOUT=0A
-20
20
Operating Current at VIN
IOP
No Load, COUT=200uF
1
0.8/1.2 2/3
IL: 0A -> 2A
|∆VLOAD|
Load Regulation (DDR I/II)
IL: 0A -> -2A
0.8/1.2 2/3
VCCA>VOUT+1.9V, IOUT=2A
0.3
0.4
Dropout Voltage
VDROPOUT
VCCA>VOUT+1.9V, IOUT=1.5A
0.2
0.25
Quiescent Current at VCCA
ICCQ
At Room Temp.
190
230
Current in Shutdown Mode
ISHDN
VREFEN<0.2V, RL= 10 Ohm
90
110
Input Voltage Range (Note 3)
VIN
No Load
1
2.5/1.8
6
Input Voltage Range (Note 3)
VCCA
RL= 10 Ohm
3.15
3.3
6
Short Circuit Protection
Current Limit
ILIMIT
5
Short Current
ISC,VIN
Sinking
2
Short Current
ISC,GND
Sourcing
2
Over Thermal Protection
Thermal Shutdown Temperature
THSD
3.15V<=VCCA<=6V
125
150
155
Thermal Shutdown Hysteresis
25
30
35
REFEN Function
VREFEN < VIN
0.4
0.5
0.6
REFEN Threshold
VREFEN < VCCA – 1.9V
Notes: 1. Maximum ratings are stress ratings only and functional device operation is not implied.
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions
2. VOS = VREFEN – VOUT
3. Keep VCCA >= VIN and VCCA >= VREFEN + 1.9V on operation power on and power off sequences
4. Guaranteed by design, not 100% test
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
UNIT
mV
mA
%
%
V
V
µA
µA
V
V
A
A
A
°C
°C
V
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UR6516B

Preliminary
CMOS IC
FUNCTIONAL DESCRIPTION
The UTC UR6516B is a low cost linear regulator, which can sink and source 2A of current without an external heat
sink.
The UTC UR6516B incorporates power MOSFETs that are capable of sourcing and sinking 2A of current while
keeping perfect voltage regulation. By using the external feedback, the output voltage can be regulated within 3% or
less. Separate voltage supply inputs have been added to fit applications with various power supplies for the databus
and power buses.
OUTPUTS
The VOUT pins (output voltage pins) are connected to the databus, address, or clock lines via an external inductor.
The output voltage varies depending on the input voltage.
INPUTS
The output voltage is determined by the input voltage. The desired output voltage could be programmable by two
external voltage divider resistors.
The VIN pin is suggested to connect to VDDQ of memory module for better tracking with memory VDDQ.
OTHER SUPPLY VOLTAGES
VCCA provide the voltage supply to the logic section and internal error amplifiers of UTC UR6516B.

TYPICAL APPLICATION CIRCUIT
VIN
1
C3
4.7µF
CEin
200µF
2
3
VOUT
4
CEout
200µF
1
C4
4.7µF
2
U1
VIN
GND
GND
GND
NC
VCCA
VOUT
REFEN
8
R1
100K
7
VCCA
6
C1
104
C2
104
R2
100K
Q1
EN
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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