- 您现在的位置：买卖IC网 > PDF目录69008 > LX1675ILQ-TR (MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP) 1.5 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC38 PDF资料下载
参数资料
| 型号： | LX1675ILQ-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封装： | 5 X 7 MM, ROHS COMPLIANT, PLASTIC, MLPQ-38 |
| 文件页数： | 8/19页 |
| 文件大小： | 324K |
| 代理商： | LX1675ILQ-TR |
LX1675
PRODUCTION DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 16
Copyright
2004
Rev. 1.2a, 2006-02-16
WWW
.Microse
m
i
.CO
M
Multiple Output LoadSHARE PWM
TM
APPLICATION NOTE ( C ONTINU ED)
OUTPUT ENABLE
The LX1675 MOSFET driver outputs are shut off by pulling
the soft-start pin below 0.1V.
The LDO voltage regulator has its own soft-start pin: SSL, that
is the same as any of the other switching phases for control of its
output voltage shut down.
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 1kΩ (order
of magnitude).
AN 18
For more information see Microsemi Application Note 1307:
LX1671 Product design Guide
. The LX1675 and LX1671 have
the same functionality and this information will be applicable.
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 LX1675 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 LX1675 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 1306: DDR SDRAM Memory
Termination
for more details.
AA
PP
LL
IICC
AA
TT
IIOO
NN
SS
相关PDF资料 |
PDF描述 |
|---|---|
| LX1675CLQ-TR | 1.5 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PQCC38 |
| LX1684CDT | 1 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO14 |
| LX1689CPW-TR | FLUORESCENT LIGHT CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| LX1689IPW-TR | FLUORESCENT LIGHT CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| LX1691IPWTR | 0.1 A FLUORESCENT LIGHT CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1676 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Mobile AMD Athlon? VRM Controller |
| LX1676 EVAL KIT | 制造商:Microsemi Corporation 功能描述:PWM CONTROLLERS - Bulk |
| LX1676_05 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Mobile AMD Athlon? VRM Controller |
| LX1676CLQ | 功能描述:IC CTRLR PS VRM BIPHASE 38MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LX1676-CLQ | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Mobile AMD AthlonTM VRM Controller |
发布紧急采购，3分钟左右您将得到回复。