Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UR5516C
LINEAR INTEGRATED CIRCUIT
3A BUS TERMINATION
REGULATOR

DESCRIPTION
The UTC UR5516C is a low cost linear regulator designed to
provide a desired output voltage or termination voltage for various
applications by converting voltage supplies ranging from 1V to
6.0V. The desired output voltage could be programmable by two
external voltage divider resistors.
The UR5516C is capable of sourcing or sinking up to 2A of
current while regulating an output VOUT voltage to within 2%
(DDR-I), 3% (DDR-II) or less.
The UR5516C provides low profile 8-pin SOIC package to
save system space.

SOP-8
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
Ordering Number
UR5516CG-S08-R

Package
SOP-8
Packing
Tape Reel
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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UR5516C
LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3,4
5
6
7
8

PIN NAME
VIN
VFB
VOUT
VREF
VCCA
AGND
PGND
DESCRIPTION
Input power
Feedback node for the VOUT
Output voltage
Reference voltage input and chip enable
Voltage supply for internal circuits
Analog ground
Power ground
BLOCK DIAGRAM
VCCA
Current Limit
VREF
VIN
Control
+
-
VOUT
Thermal Limit
GND
VFB
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
VCCA Supply Voltage, VCCA to GND
VCCA
-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
VCCA Supply Voltage (Note 1)
VCCA
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 VCCA-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
θJC
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RATINGS
14
UNIT
°C/W
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(TJ=25°C, VCCAL=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
VCCA 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
ICCA
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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LINEAR INTEGRATED CIRCUIT
APPLICATIONS CIRCUIT

Application Circuit as Adjustable LDO
VCCA
R3&R4 to set VFB,and
VOUT range could be
adjusted from 0V to VIN
VIN
R1
VIN
VCCA
GND VFB
Q1
R2
CVCCA
10uF
VOUT
VREF
EN
CIN
470uF
VOUT
R3
CSS
1uF
COUT
200uF
R4
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LINEAR INTEGRATED CIRCUIT
OPERATING WAVEFORMS
1. Load Transient Response: IOUT = +10mA -> +3A -> +10mA
- VIN = 2.5V, VCCA= 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, VCCA = 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, VCCA = 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, VCCA = 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
VCCA=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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www.unisonic.com.tw
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