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参数资料
| 型号： | LT1776 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | Wide Input Range, High Efficiency, Step-Down Switching Regulator(宽输入范围，高效率，5V输出步降开关稳压器) |
| 中文描述： | 宽输入范围，高效率，降压型开关稳压器（宽输入范围，高效率，5V的输出步降开关稳压器） |
| 文件页数： | 13/20页 |
| 文件大小： | 152K |
| 代理商： | LT1776 |
13
LT1776
APPLICATIO
S I
FOR
ATIO
U
W
U
U
The high speed switching current path is shown schemati-
cally in Figure 3. Minimum lead length in these paths is
essential to ensure clean switching and minimal EMI. The
paths containing the input capacitor, output switch and
output diode are the only ones containing nanosecond rise
and fall times. Keep these paths as short as possible.
As an example, assume that the capacitance between the
V
SW
node and a high impedance pin node is 0.1pF, and
further assume that the high impedance node in question
exhibits a capacitance of 1pF to ground. Due to the high
dV/dt, large excursion behavior of the V
SW
node, this will
couple a nearly 4V transient to the high impedance pin,
causing abnormal operation. (This assumes the “typical”
40V
IN
to 5V
OUT
application.) An explicit 100pF capacitor
added to the node will reduce the amplitude of the distur-
bance to more like 50mV (although settling time will
increase).
Specific pin recommendations are as follows:
SHDN: If unused, add a 100pF capacitor to ground.
SYNC: Ground if unused.
V
C
: Add a capacitor directly to ground in addition to the
explicit compensation network. A value of one-tenth of
the main compensation capacitor is recommended, up
to a maximum of 100pF.
FB: Assuming the V
C
pin is handled properly, this pin
usually requires no explicit capacitor of its own, but
keep this node physically small to minimize stray
capacitance.
+
+
LT1776
V
SW
C1
D1
V
IN
V
OUT
V
IN
C2
1776 F03
Figure 3. High Speed Current Switching Paths
Additionally, it is possible for the LT1776 to cause EMI
problems by “coupling to itself”. Specifically, this can
occur if the V
SW
pin is allowed to capacitively couple in an
uncontrolled manner to the part’s high impedance nodes,
i.e., SHDN, SYNC, V
C
and FB. This can cause erratic
operation such as odd/even cycle behavior, pulse width
“nervousness”, improper output voltage and/or prema-
ture current limit action.
相关PDF资料 |
PDF描述 |
|---|---|
| LT1777C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1777IS | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1777CS | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1777I | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1777 | Low Noise Step-Down Switching Regulator(低噪声，5V输出步降开关稳压器) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1776C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Range, High Efficiency, Step-Down Switching Regulator |
| LT1776CN8 | 功能描述:IC REG BUCK ADJ 0.7A 8DIP 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: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 |
| LT1776CN8#PBF | 功能描述:IC REG BUCK ADJ 0.7A 8DIP 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 |
| LT1776CS8 | 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: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 |
| LT1776CS8#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 |
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