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參數(shù)資料
| 型號： | UR5512-SH2-T |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | 2A DDR BUS TERMINATION REGULATOR |
| 中文描述： | 甲DDR總線終端調(diào)節(jié)器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 126K |
| 代理商： | UR5512-SH2-T |
UR5512
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R101-017,A
FUNCT IONAL DES CRIPT ION
General Information
The
UR5512
is a linear regulator designed for DDR SDRAM bus terminator application. The output, V
OUT
is
capable of sourcing or sinking current up to 2A peak while regulating the output voltage to within 20mV offset. The
UR5512
has excellent response to load regulation while preventing shoot through. Active-low shutdown mechanism
and fault protections. The
UR5512
is available in several packages to meet different power dissipation and surface
mount applications.
Output Voltage Regulation
The output voltage tracks the reference voltage applied at V
REF
pin. Two internal NPN pass transistors act as the
buffered output regulate the output voltage by sourcing current from V
IN
pin or sinking current to GND pin. An internal
Kelvin sensing scheme is use at the V
OUT
pin to improve load regulation at various load current. Since the
UR5512
exhibits excellent response to load transient, lesser amount of capacitors can be used.
Current Limit
An internal current limiting sensor is used to monitor the maximum output current to prevent damages from
overload or short-circuit condition. Increasing the input voltage of V
IN
or V
CNTL
will get higher current-limit points.
Shutdown and Soft-Start
An additional function of the V
REF
pin is acting as a shutdown control input that can be used for
suspend to RAM
functionality
. Applying and holding a voltage below 0.15V to V
REF
pin shuts down the output of the regulator. An
external NPN transistor or N-channel MOSFET is used to pull down the V
REF
pin voltage; while applying a “high”
signal to turn on the transistor. During shutdown condition, the two pass transistors are turned off and the output
V
OUT
will tri-state; sourcing or sinking no current. When releasing the V
REF
pin, the current through the resistor divider
charges the capacitor Css to initiate a soft-start cycle.
Thermal Shutdown
If the junction temperature exceeds the thermal shutdown (T
J
= +150°C) then the part will enter a shutdown state.
A thermal sensor turns off both pass transistors, allowing the device to cool down. After the junction temperature
reduces by 40°C, the regulator starts to regulate again; resulting in a pulsed output during continuous thermal
overload conditions.
Power Inputs
Input power up sequence are not required for V
IN
and V
CNTL
. Be careful; do not apply voltage to V
OUT
when there is
no V
CNTL
voltage presented. This is due to the internal parasitic diodes between V
OUT
to V
IN
and V
OUT
to V
CNTL
which
will be forward bias.
Reference Voltage
The reference voltage is programmed by a resistor divider between V
IN
and GND pins. The recommended resistor
is < 5k
to maintain the accuracy of the output voltage. For improved the performance, an external bypass capacitor
can be used, located close to V
REF
pin to help with noise. A ceramic capacitor can be use and is selected to be
greater than 0.1μF. Do not place any additional loading on this reference input pin.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UR5515 | 1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-S08-R | 1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-S08-T | 1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-TN5-R | 1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-TN5-T | 1.5A/3A BUS TERMINATION REGULATOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UR5512-TN5-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:2A DDR BUS TERMINATION REGULATOR |
| UR5515 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-S08-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-S08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:1.5A/3A BUS TERMINATION REGULATOR |
| UR5515L-TN5-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:1.5A/3A BUS TERMINATION REGULATOR |
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