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| 型号： | LX1671-CLQTR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封装： | 5 x 7 MM, PLASTIC, MLPQ-38 |
| 文件页数： | 10/21页 |
| 文件大小： | 447K |
| 代理商： | LX1671-CLQTR |
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 18
Copyright
2000
Rev. 1.0a, 2004-06-14
WWW
.Microse
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.CO
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LX1671
Multiple Output LoadSHARE PWM
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
APPLICATION NOTE ( C ONTINU ED)
OUTPUT ENABLE
The LX1671 MOSFET driver outputs are shut off by pulling
the soft-start pin below 0.3V.
The LDO voltage regulator has its own Enable/Disable pin
(LDDIS) for control of this output voltage.
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: This equation is simplified and does not account for
error amplifier input current. Keep R1 and R2 close to 1k (order
of magnitude).
AN 18
For more information see Microsemi Application Note 18
LX1671 Product design Guide
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 LX1671 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 LX1671 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 |
|---|---|
| LX1672-06CLQ-TR | 1 A DUAL SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC38 |
| LX1672-03CPW-TR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| LX1672-03CLQ-TR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
| LX1673-06CLQT | 1 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC20 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1671CLQ-TR | 制造商:Microsemi Corporation 功能描述:SWITCHING RGLTR. - Tape and Reel |
| LX1671CPW | 功能描述:IC REG CTRLR BUCK PWM VM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:LoadSHARE™ 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1671CPW-TR | 制造商:Microsemi Corporation 功能描述:MULTIPLE OUTPUT LOADSHARE PWM - Tape and Reel |
| LX1671EVALKIT | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Switching Regulator |
| LX1672 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Multiple Output LoadSHARE PWM |
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