UNISONIC TECHNOLOGIES CO., LTD
UR5516A
3A BUS TERMINATION
REGULATOR
DESCRIPTION
The UTC
UR5516A
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 V
REF
pin. A resistor divider connected to V
IN
,
GND and V
REF
pins is used to provide a half voltage of V
IN
to V
REF
pin. In addition, an external ceramic capacitor and an open-drain
transistor connected to V
REF
pin provides soft-start and shutdown
control respectively. Pulling and holding the V
REF
to GND shuts off
the output. The output of UTC
UR5516A
will be high impedance
after being shut down by V
REF
or thermal shutdown function.
LINEAR INTEGRATED CIRCUIT
HSOP-8
*Pb-free plating product number: UR5516AL
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, V
OUT
offset and temperature
* Adjustable output voltage by external resistors
* Current-limit protection
* On-chip thermal shutdown
* Shutdown for standby or suspend mode
ORDERING INFORMATION
Ordering Number
Normal
Lead Free Plating
UR5516A-SH2-R
UR5516AL-SH2-R
UR5516A-SH2-T
UR5516AL-SH2-T
Package
HSOP-8
HSOP-8
Packing
Tape Reel
Tube
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Copyright © 2007 Unisonic Technologies Co., Ltd
1 of 9
QW-R101-018,A
UR5516A
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
NC: No Connection
PIN DESCRIPTION
PIN NAME
V
IN
I/O
I
DESCRIPTION
Main power input pin. Connect this pin to a voltage source and an input capacitor. The
UTC
UR5516A
sources current to V
OUT
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
UR5516A
sinks current from V
OUT
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
UR5516A.
Connect this pin to a resistor divider,
between V
IN
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.
GND
O
V
CNTL
I
V
REF
I
V
OUT
O
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QW-R101-018,A
UR5516A
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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UR5516A
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
RATINGS
UNIT
V
CNTL
Supply Voltage, V
CNTL
to GND
V
CNTL
-0.2 ~ 7
V
V
IN
Supply Voltage, V
IN
to GND
V
IN
-0.2 ~ 3.9
V
Power Dissipation
P
D
Internally Limited
W
Junction Temperature
T
J
+150
°C
Storage Temperature
T
STG
-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
V
CNTL
Supply Voltage (Note 1)
V
CNTL
3.1 ~ 6
V
V
IN
Supply Voltage (Note 2)
V
IN
1.2 ~ 3.5
V
V
REF
Input Voltage
V
REF
0.85 ~ 1.75
V
V
OUT
Output Voltage (Note 3)
V
OUT
V
REF
± 0.02
V
V
OUT
Output Current (Note 4,5)
I
OUT
-3 ~ +3
A
Junction Temperature
T
J
0 ~ +125
°C
Note: 1. Please always keep V
CNTL
-V
OUT
>1.9V for good regulation.
2. Please supply enough voltage to V
IN
for sourcing desired maximum output current. Please refer to the V
IN
Dropout Voltage vs. Output Current in the Typical Characteristics.
3. The V
OUT
is regulated to the V
REF
with additional voltage offset and load regulation except over-load
conditions.
4. The symbol “+” means the V
OUT
sources current to load; the symbol “-“ means the V
OUT
sinks current to
GND.
5. The max. I
OUT
varies with the T
J
and the voltages of V
IN
-V
OUT
and V
OUT
. Please refer to the Typical
Characteristics.
THERMAL DATA
PARAMETER
Thermal Resistance
SYMBOL
θ
JA
RATINGS
80
UNIT
°C/W
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QW-R101-018,A
UR5516A
otherwise specified)
PARAMETER
Output Voltage
System Accuracy
Offset Voltage (V
OUT
–V
REF
)
Load Regulation
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
(T
J
=25°C,V
CNTL
=3.3V,V
IN
=2.5V/1.8V,V
REF
=0.5V
IN
,unless
SYMBOL
TEST CONDITIONS
MIN
V
OUT
I
OUT
=0A
Over temperature, V
OUT
offset, and load
-20
regulation
I
OUT
=+10mA
-20
V
O(OFF)
I
OUT
=-10mA
I
OUT
=+10mA ~ +3A
∆V
OUT
I
OUT
= -10mA ~ -3A
T
J
=25°C
+3
Sourcing Current (V
IN
=2.5V)
T
J
=125°C
T
J
=25°C
-3
Sinking Current (V
IN
=2.5V)
T
J
=125°C
I
LIMIT
T
J
=25°C +2.9
Sourcing Current (V
IN
=1.8V)
T
J
=125°C
T
J
=25°C
-2.9
Sinking Current (V
IN
=1.8V)
T
J
=125°C
T
SHDN
Rising T
J
T
HYS
I
OUT
=0A
1
I
CNTL
I
OUT
=±3A (Normal Operation)
V
REF
=GND (Shutdown)
V
REF
=1.25V/0.9V (Normal Operation)
I
BIAS
V
REF
=GND (Shutdown)
V
SHDN
0.2
TYP
V
REF
MAX UNIT
V
20
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
mV
%
Current Limit
A
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V
CNTL
Supply Current
V
REF
Bias Current (The current
flows out of V
REF
)
Shutdown Threshold Voltage
°C
°C
3
110
500
40
0.65
mA
nA
µA
V
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QW-R101-018,A
Microcontroller MCU
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