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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 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 UR5516A will be high impedance after being shut down by VREF 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, 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 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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PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
NC: No Connection
PIN DESCRIPTION
PIN NAME VIN 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 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 UR5516A 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 UR5516A. 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.
GND
O
VCNTL
I
VREF
I
VOUT
O
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BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
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 JA RATINGS 80 UNIT C/W
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otherwise specified) PARAMETER Output Voltage System Accuracy Offset Voltage (VOUT-VREF) Load Regulation
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(TJ=25C,VCNTL=3.3V,VIN=2.5V/1.8V,VREF=0.5VIN,unless
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=25C +3 Sourcing Current (VIN=2.5V) TJ=125C TJ=25C -3 Sinking Current (VIN=2.5V) TJ=125C ILIMIT TJ=25C +2.9 Sourcing Current (VIN=1.8V) TJ=125C TJ=25C -2.9 Sinking Current (VIN=1.8V) TJ=125C TSHDN Rising TJ THYS IOUT=0A 1 ICNTL IOUT=3A (Normal Operation) VREF=GND (Shutdown) VREF=1.25V/0.9V (Normal Operation) IBIAS VREF=GND (Shutdown) VSHDN 0.2 TYP VREF 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 VCNTL Supply Current VREF Bias Current (The current flows out of VREF) Shutdown Threshold Voltage
C C 3 110 500 40 0.65 mA nA A V
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APPLICATIONS CIRCUIT
1. General Application
LINEAR INTEGRATED CIRCUIT
2.
For VOUT=1.25V/0.9V
3.
For VOUT=1.4V
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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 = 470F/10V, ESR = 30m - IOUT slew rate = 3A/S
LINEAR INTEGRATED CIRCUIT
2. Load Transient Response: IOUT = -10mA -> -3A -> -10mA - VIN = 2.5V, VCNTL = 3.3V - VREF is 1.250V supplied by a regulator - COUT = 470F/10V, ESR = 30m - IOUT slew rate = 3A/S IOUT = -10mA -> -3A -> -10mA
Load Regulation = +6.5mV VOUT IC IOUT
AT
+10mA
-3A
Ch1 : VOUT, 20mV/Div, DC, Offset = 1.250V Ax1 : IOUT, 1A/Div Time : 20 S/Div
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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 = 470F/10V, ESR = 30m - IOUT slew rate = 3A/S
LINEAR INTEGRATED CIRCUIT
4. Short-Circuit Test - VIN = 2.5V, VCNTL = 3.3V
VOUT is Shorted to GND
IOUT VOUT IOUT AT AT VOUT VOUT IC IC IOUT
VOUT is Shorted to VIN (2.5V)
Ch1 : VOUT, 500mV/Div, DC, Offset = 1.250V Ax1 : IOUT, 2A/Div Time : 5mS/Div
Ch1 : VOUT, 500mV/Div, DC, Offset = 1.250V Ax1 : IOUT, 2A/Div Time : 5mS/Div
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TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
A)
VREF Bias Current, IBIAS (
VIN Dropout Voltage vs. Output Current
1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 VREF=0.9V VCNTL=5.0V TJ = 25C
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.
UNISONIC TECHNOLOGIES CO., LTD
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Dropout Voltage (V)
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