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参数资料
| 型号： | LT1676IS8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SPST, 150mA PC Mount Pushbutton |
| 中文描述： | 1 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 6/16页 |
| 文件大小： | 135K |
| 代理商： | LT1676IS8 |
6
LT1676
BLOCK DIAGRA
SWDR
SWON
BOOST
SWOFF
SWDR
SWON
BOOST
1676 BD
SWOFF
LOGIC
OSC
BIAS
V
TH
V
B
V
BG
V
BG
FB
V
C
GND
SYNC
SHDN
V
CC
FB
AMP
BOOST
COMP
gm
I
I
I
I
R1
R
SENSE
I
COMP
Q4
Q3
Q2
Q1
Q5
V
SW
D1
V
IN
5
3
2
1
6
4
8
7
OPERATIOU
The LT1676 is a current mode switching regulator IC that
has been optimized for high efficiency operation in high
input voltage, low output voltage Buck topologies. The
Block Diagram shows an overall view of the system.
Several of the blocks are straightforward and similar to
those found in traditional designs, including: Internal Bias
Regulator, Oscillator and Feedback Amplifier. The novel
portion includes an elaborate Output Switch section and
Logic Section to provide the control signals required by
the switch section.
The LT1676 operates much the same as traditional
current mode switchers, the major difference being its
specialized output switch section. Due to space con-
straints, this discussion will not reiterate the basics of
current mode switcher/controllers and the “Buck” topol-
ogy. A good source of information on these topics is
Application Note 19.
Output Switch Theory
One of the classic problems in delivering low output
voltage from high input voltage at good efficiency is that
minimizing AC switching losses requires very fast volt-
age (dV/dt) and current (dI/dt) transition at the output
device. This is in spite of the fact that in a bipolar
implementation, slow lateral PNPs must be included in
the switching signal path.
Fast positive-going slew rate action is provided by lateral
PNP Q3 driving the Darlington arrangement of Q1 and Q2.
The extra
β
available from Q2 greatly reduces the drive
requirements of Q3.
Although desirable for dynamic reasons, this topology
alone will yield a large DC forward voltage drop. A second
lateral PNP, Q4, acts directly on the base of Q1 to reduce
the voltage drop after the slewing phase has taken place.
To achieve the desired high slew rate, PNPs Q3 and Q4 are
“force-fed” packets of charge via the current sources
controlled by the boost signal.
相关PDF资料 |
PDF描述 |
|---|---|
| LT1677C | Low Noise, Rail-to-Rail Precision Op Amp |
| LT1677IN8 | Low Noise, Rail-to-Rail Precision Op Amp |
| LT1677IS8 | Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 5 psi, Gage, 1/4 BSPP, 10 Vdc excitation |
| LT1677CN8 | Low Noise, Rail-to-Rail Precision Op Amp |
| LT1677CS8 | Low Noise, Rail-to-Rail Precision Op Amp |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1676IS8#PBF | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1676IS8#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR 8-SOIC 制造商:Linear Technology 功能描述:IC, STEP-DOWN REGULATOR, 8-SOIC |
| LT1676IS8#TR | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC RoHS:否 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1676IS8#TRPBF | 功能描述:IC REG BUCK ADJ 0.7A 8SOIC 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1676IS8PBF | 制造商:Linear Technology 功能描述:Sw. Regulator Step-Down 7.4-60V SOIC8 |
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