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参数资料
| 型号： | LX1672-03CLQTR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封装： | PLASTIC, MLPQ-38 |
| 文件页数： | 9/20页 |
| 文件大小： | 358K |
| 代理商： | LX1672-03CLQTR |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 17
Copyright
2000
Rev. 0.3m, 2005-04-12
WWW
.Microse
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i
.CO
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LX1672
Multiple Output LoadSHARE PWM
PRELIMINARY DATA SHEET
TM
APPLICATION NOTE ( C ONTINU E D )
OUTPUT DISABLE
The LX1672 PWM MOSFET driver outputs are shut off by
pulling the disable (DISX) pins above 1.2V.
The LDO voltage regulator has its own Disable pin (LDDIS)
for control of this output voltage. Pulling this pin above 3 V
disables the LDO.
PROGRAMMING THE OUTPUT VOLTAGE
The output Voltage is sensed by the feedback pin (FBX) which
is compared to a 0.8V reference. The output voltage can be set to
any voltage above 0.8V (and lower than the input voltage) by
means of a resistor divider R1-R2 (see Figure 1).
)
/R
R
(1
V
2
1
REF
OUT
+
=
Note: Keep R1 and R2 close to 1k (order of magnitude)
DDR VTT TERMINATION VOLTAGE
Double Data Rate (DDR) SDRAM requires a termination
voltage (VTT) in addition to the line driver supply voltage
(VDDQ) and receiver supply voltage (VDD). Although it is not a
requirement VDD is generally equal to VDDQ so that only VTT
and VDDQ are required..
The LX1672 can supply both voltages by using two of the three
PWM phases. Since the currents for VTT and (VDD plus VDDQ)
are quite often several amps, (2A to 6A is common) a switching
regulator is a logical choice
VTT for DDR memory can be generated with the LX1672 by
using the positive input of the phase 2 error amplifier RF2 as a
reference input from an external reference voltage VREF which is
defined as one half of VDDQ. Using VREF as the reference input
will insure that all voltages are correct and track each other as
specified in the JEDEC (EIA/JESD8-9A) specification. The phase 2
output will then be equal to VREF and track the VDDQ supply as
required.
When an external reference is used the Soft Start will not be
functional for that phase
See Microsemi Application Note 17 for more details.
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相关PDF资料 |
PDF描述 |
|---|---|
| LX1673-03CPWTR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| LX1673-03CLQTR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-09CPWTR | 1 A SWITCHING CONTROLLER, 1035 kHz SWITCHING FREQ-MAX, PDSO20 |
| LX1673-06CLQ | 1 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC20 |
| LX1673-03CPW-TR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1672-03CLQ-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT Hi/Lo Side Half Brdg Non-Inv 38-Pin MLPQ T/R |
| LX1672-03CPW | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:LoadSHARE™ 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LX1672-03CPW-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT HI/LO SIDE HALF BRDG NON-INV 28TSS - Tape and Reel |
| LX1672-05CPW | 功能描述:IC REG CTRLR BUCK PWM VM 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:LoadSHARE™ 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LX1672-05CPW-TR | 制造商:Microsemi Corporation 功能描述:MOSFET DRVR 0.8V 1A 3-OUT HI/LO SIDE HALF BRDG NON-INV 28TSS - Tape and Reel |
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