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| 型号： | LTC3447EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.69 V ~ 2.05 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3447
OPERATIO
External Start-Up Option
The LTC3447 allows for the use of optional external resistors
to determine the start-up voltage. Using this option, the
start-up voltage can be set to levels inside or outside the
DAC output’s operating range. The output voltage will be
regulated at this value until the internal DAC is updated and
a STOP command is received. Once the STOP command is
received, the internal DAC will retain control of the output
voltage until the part is disabled then enabled again.
If this feature is not used, the feedback pin must be tied
to V IN .
I 2 C OPERATION
Typical 2-wire serial I 2 C
Serial interface
Simple 2-wire interface
Multiple devices on same bus
Idle bus must have SDA and SCL lines high
LTC3447 is write only
Master controls bus
Devices listen for unique address that precedes data
General I 2 C Bus/SMBus Description
I 2 C Bus and SMBus are reasonably similar examples of
two wire, bidirectional, serial communications busses.
Calling them two wire is not strictly accurate, as there
is an implied third wire, which is the ground line. Large
ground drops or spikes between the grounds of different
parts on the bus can interrupt or disrupt communica-
tions, as the signals on the two wires are both inherently
referenced to a ground which is expected to be common
to all parts on the bus. Both bus types have one data line
and one clock line which are externally pulled to a high
voltage when they are not being controlled by a device on
the bus. The devices on the bus can only pull the data and
clock lines low, which makes it simple to detect if more
than one device is trying to control the bus; eventually, a
device will release a line and it will not pull high because
another device is still holding it low. Pull-ups for the data
and clock lines are usually provided by external discrete
resistors, but external current sources can also be used.
Since there are no dedicated lines to use to tell a given
device if another device is trying to communicate with it,
each device must have a unique address to which it will
respond. The ?rst part of any communication is to send
out an address on the bus and wait to see if another device
responds to it. After a response is detected, meaningful
data can be exchanged between the parts.
Typically, one device will control the clock line at least most
of the time and will normally be sending data to the other
parts and polling them to send data back to it, and this
device is called the master. There can certainly be more
than one master, since there is an effective protocol to
resolve bus contentions, and nonmaster (slave) devices
can also control the clock to delay rising edges and give
themselves more time to complete calculations or com-
munications (clock stretching). Slave devices need to be
able to control the data line to acknowledge communica-
tions from the master, and some devices will need to able
to send data back to the master; they will be in control of
the data line while they are doing so. Many slave devices
will have no need to stretch the clock signal and will have
no ability to pull the clock line low, which is the case with
the LTC3447.
Data is exchanged in the form of bytes, which are 8-bit
packets. Every byte needs to be acknowledged by the
slave (data line pulled low) or not acknowledged by the
master (data line left high), so communications are bro-
ken up into 9-bit segments, one byte followed by one bit
for acknowledging. For example, sending out an address
consists of 7-bits of device address, 1-bit that signals
whether a read or write operation will be performed, and
then 1 more bit to allow the slave to acknowledge. There
is no theoretical limit to how many total bytes can be
exchanged in a given transmission.
I 2 C and SMBus are very similar speci?cations, SMBus hav-
ing been derived from I 2 C. In general, SMBus is targeted
toward low power devices (particularly battery powered
ones) and emphasizes low power consumption, while I 2 C
is targeted toward higher speed systems where the power
consumption of the bus is not so critical. I 2 C has three dif-
ferent speci?cations for three different maximum speeds,
these being standard mode (100kHz max), fast mode
(400kHz max), and HS mode (3.4MHz max). Standard and
fast mode are not radically different, but HS mode is very
different from a hardware and software perspective and
requires an initiating command at standard or fast speed
before data can start transferring at HS speed. SMBus
simply speci?es a 100kHz maximum speed.
3447f
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| LTC3448 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode |
| LTC3448EDD | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3448EDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3448EDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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