Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UR5516
LINEAR INTEGRATED CIRCUIT
3A BUS TERMINATION
REGULATOR

SOP-8
DESCRIPTION
HSOP-8
The UTC UR5516 is designed to provide a regulated voltage with
bi-directional output current for DDR-SDRAM termination.
Current-limit work to limit the short-circuit current, on-chip thermal
shutdown provides protection against any combination of overload
that would create excessive junction temperature. The output voltage
tracks the voltage at VREF pin. A resistor divider connected to VIN,
GND and VREF pins is used to provide a half voltage of VIN to VREF
pin. In addition, an external ceramic capacitor and an open-drain
transistor connected to VREF pin provides soft-start and shutdown
control respectively. Pulling and holding the VREF to GND shuts off
the output. The output of UTC UR5516 will be high impedance after
being shut down by VREF or thermal shutdown function.

1
TO-252-5
1
TO-263-5
FEATURES
* Provide bi-direction current
- Sourcing or sinking current up to 3A
* 1.25V/0.9V output for DDR I/II applications
* Fast transient response
* High output accuracy
- ±20mv over load, VOUT offset and temperature
* Adjustable output voltage by external resistors
* Current-limit protection
* On-chip thermal shutdown
* Shutdown for standby or suspend mode

ORDERING INFORMATION
Normal
UR5516-S08-R
UR5516-SH2-R
UR5516-TN5-R
UR5516-TN5-T
UR5516-TQ5-R
UR5516-TQ5-T
Ordering Number
Lead Free Plating
UR5516L-S08-R
UR5516L-SH2-R
UR5516L-TN5-R
UR5516L-TN5-T
UR5516L-TQ5-R
UR5516L-TQ5-T
UR5516G-S08-R
Package
Packing
SOP-8
HSOP-8
TO-252-5
TO-252-5
TO-263-5
TO-263-5
Tape Reel
Tape Reel
Tape Reel
Tube
Tape Reel
Tube
(1) R: Tape Reel, T: Tube
(1)Packing Type
(2)Package Type
(3)Green Package
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Copyright © 2015 Unisonic Technologies Co., Ltd
(2) S08: SOP-8, SH2: HSOP-8, TN5: TO-252-5,
TQ5: TO-263-5
(3) G: Halogen Free and Lead Free
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
LINEAR INTEGRATED CIRCUIT
MARKING
SOP-8 / HSOP-8
TO-252-5 / TO-263-5
UTC
UR5516
L: Lead Free
G: Halogen Free
Date Code
Lot Code
1

PIN CONFIGURATION
VIN
1
8
VCNTL
GND
2
7
VCNTL
VREF
3
6
VCNTL
VOUT
4
5
VCNTL
SOP-8
NC: No Connection

PIN DESCRIPTION
PIN NAME
I/O
VIN
I
GND
O
VCNTL
I
VREF
I
VOUT
O
DESCRIPTION
Main power input pin. Connect this pin to a voltage source and an input capacitor. The
UTC UR5516 sources current to VOUT pin by controlling the upper NPN pass transistor,
providing a current path from VIN pin.
Power and signal ground. Connect this pin to system ground plane with shortest traces.
The UTC UR5516 sinks current from VOUT pin by controlling the lower NPN pass
transistor, providing a current path to GND pin. This pin is also the ground path for
internal control circuitry.
Power input pin for internal control circuitry. Connect this pin to a voltage source,
providing a bias for the internal control circuitry. A bypass capacitor is usually connected
near this pin.
Reference voltage input and active-low shutdown control pin. Apply a voltage to this pin
as a reference voltage for the UTC UR5516. Connect this pin to a resistor divider,
between VIN and GND, and a capacitor for soft-start and filtering noise purposes.
Applying and holding this pin low by an open-drain transistor to shut down the output.
Output pin of the regulator. Connect this pin to load. Output capacitors connected this pin
improves stability and transient response. The output voltage tracks the reference
voltage and is capable of sourcing or sinking current up to 3A.
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
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
VCNTL Supply Voltage, VCNTL to GND
VCNTL
-0.2 ~ 7
V
VIN Supply Voltage, VIN to GND
VIN
-0.2 ~ 3.9
V
Power Dissipation
PD
Internally Limited
W
Junction Temperature
TJ
+150
C
Storage Temperature
TSTG
-40 ~ +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.

RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
RANGES
UNIT
VCNTL Supply Voltage (Note 1)
VCNTL
3.1 ~ 6
V
VIN Supply Voltage (Note 2)
VIN
1.2 ~ 3.5
V
VREF Input Voltage
VREF
0.85 ~ 1.75
V
VOUT Output Voltage (Note 3)
VOUT
VREF ± 0.02
V
VOUT Output Current (Note 4,5)
IOUT
-3 ~ +3
A
Junction Temperature
TJ
0 ~ +125
C
Note: 1. Please always keep VCNTL-VOUT>1.9V for good regulation.
2. Please supply enough voltage to VIN for sourcing desired maximum output current. Please refer to the VIN
Dropout Voltage vs. Output Current in the Typical Characteristics.
3. The VOUT is regulated to the VREF with additional voltage offset and load regulation except over-load
conditions.
4. The symbol “+” means the VOUT sources current to load; the symbol “-“ means the VOUT sinks current to
GND.
5. The max. IOUT varies with the TJ and the voltages of VIN-VOUT and VOUT. Please refer to the Typical
Characteristics.

THERMAL DATA
PARAMETER
Thermal Resistance
SYMBOL
SOP-8
HSOP-8
TO-252-5
TO-263-5
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θJA
RATINGS
160
80
80
50
UNIT
°C/W
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(TJ=25°C,VCNTL=3.3V,VIN=2.5V/1.8V,VREF=0.5VIN,unless
otherwise specified)
PARAMETER
Output Voltage
System Accuracy
Offset Voltage (VOUT–VREF)
Load Regulation
Current Limit
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
VCNTL Supply Current
VREF Bias Current (The current
flows out of VREF)
Shutdown Threshold Voltage
SYMBOL
TEST CONDITIONS
MIN
VOUT IOUT=0A
Over temperature, VOUT offset, and load
-20
regulation
IOUT=+10mA
-20
VO(OFF)
IOUT=-10mA
IOUT=+10mA ~ +3A
∆VOUT
IOUT= -10mA ~ -3A
TJ=25°C
+3
Sourcing Current (VIN=2.5V)
TJ=125°C
TJ=25°C
-3
Sinking Current (VIN=2.5V)
TJ=125°C
ILIMIT
TJ=25°C +2.9
Sourcing Current (VIN=1.8V)
TJ=125°C
TJ=25°C
-2.9
Sinking Current (VIN=1.8V)
TJ=125°C
TSHDN Rising TJ
THYS
1
IOUT=0A
ICNTL IOUT=±3A (Normal Operation)
VREF=GND (Shutdown)
VREF=1.25V/0.9V (Normal Operation)
IBIAS
VREF=GND (Shutdown)
VSHDN
0.2
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TYP
VREF
MAX
UNIT
V
20
mV
20
2
2
+3.6
+3.1
-3.6
-3.1
+3.2
+2.6
-3.2
-2.6
183
42
2
50
2.0
200
20
0.35
mV
%
A
C
C
3
110
mA
500
40
0.65
nA
μA
V
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APPLICATIONS CIRCUIT
1.
General Application
2.
For VOUT=1.25V/0.9V
3.
For VOUT=1.4V
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LINEAR INTEGRATED CIRCUIT
OPERATING WAVEFORMS
1. Load Transient Response: IOUT = +10mA -> +3A -> +10mA
- VIN = 2.5V, VCNTL = 3.3V
- VREF is 1.250V supplied by a regulator
- COUT = 470μF/10V, ESR = 30mΩ
- IOUT slew rate = ±3A/μS
2. Load Transient Response: IOUT = -10mA -> -3A -> -10mA
- VIN = 2.5V, VCNTL = 3.3V
- VREF is 1.250V supplied by a regulator
- COUT = 470μF/10V, ESR = 30mΩ
- IOUT slew rate = ±3A/μS
IOUT = -10mA -> -3A -> -10mA
Load Regulation = +6.5mV
VOUT
IC
AT
+10mA
IOUT
-3A
Ch1 : VOUT, 20mV/Div, DC,
Offset = 1.250V
Ax1 : IOUT, 1A/Div
Time : 20μS/Div
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LINEAR INTEGRATED CIRCUIT
OPERATNG WAVEFORMS(Cont.)
3. Load Transient Response: IOUT = +3A -> -3A -> +3A
- VIN = 2.5V, VCNTL = 3.3V
- VREF is 1.250V supplied by a regulator
- COUT = 470μF/10V, ESR = 30mΩ
- IOUT slew rate = ±3A/μS
4. Short-Circuit Test
- VIN = 2.5V, VCNTL = 3.3V
VOUT is Shorted to GND
VOUT is Shorted to VIN (2.5V)
IOUT
VOUT
IOUT
AT
AT
VOUT
IOUT
VOUT
IC
IC
Ch1 : VOUT, 500mV/Div, DC,
Offset = 1.250V
Ax1 : IOUT, 2A/Div
Time : 5mS/Div
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Ch1 : VOUT, 500mV/Div, DC,
Offset = 1.250V
Ax1 : IOUT, 2A/Div
Time : 5mS/Div
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TYPICAL CHARACTERISTICS
Dropout Voltage (V)
VREF Bias Current, IBIAS (μA)

LINEAR INTEGRATED CIRCUIT
VIN Dropout Voltage vs. Output Current
1.2
1.0
VREF=0.9V
VCNTL=5.0V
TJ = 25°C
0.8
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Output Current (A)
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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