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| 型号： | LT3506AIDHD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.6A DL 16DFN |
| 标准包装： | 73 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 22 V |
| 输入电压： | 3.6 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 1.6A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-DFN（5x4） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3506/LT3506A
APPLICATIONS INFORMATION
to the regulation voltage. For a 5% overshoot, this require-
ment becomes
C OUT > 10L(I LIM /V OUT ) 2 .
Finally, there must be enough capacitance for good transient
performance. The last equation gives a good starting point.
Alternatively, you can start with one of the designs in this
its ESR, both the size and the value will be larger than a
ceramic capacitor that would give similar ripple perfor-
mance. One bene?t is that the larger capacitance may give
better transient response for large changes in load current.
Table 2 lists several capacitor vendors.
Table 2. Low-ESR Surface Mount Capacitors
data sheet and experiment to get the desired performance.
This topic is covered more thoroughly in the section on
loop compensation.
For 5V and 3.3V outputs with greater than 1A output, a
22μF 6.3V ceramic capacitor (X5R or X7R) at the output
results in very low output voltage ripple and good tran-
sient response. For lower voltages, 22μF is adequate but
increasing C OUT will improve transient performance. For
the LT3506A, 10μF of output capacitance is suf?cient at
V OUT between 3.3V and 5V. Other types and values can be
used. The following discusses tradeoffs in output ripple
and transient performance.
VENDOR
Taiyo-Yuden
AVX
Kemet
Sanyo
Panasonic
TDK
TYPE
Ceramic
Ceramic
Tantalum
Tantalum
Tantalum
Organic
Aluminum
Organic
Tantalum or Aluminum
Organic
Aluminum
Organic
Ceramic
SERIES
TPS
T491, T494, T495, T520
A700
POSCAP
SP
CAP
The high performance (low ESR), small size and robust-
ness of ceramic capacitors make them the preferred type
for LT3506 applications. However, all ceramic capacitors
are not the same. As mentioned above, many of the
higher value capacitors use poor dielectrics with high
temperature and voltage coef?cients. In particular, Y5V
and Z5U types lose a large fraction of their capacitance
with applied voltage and temperature extremes. Because
the loop stability and transient response depend on the
value of C OUT , you may not be able to tolerate this loss.
Use X7R and X5R types.
You can also use electrolytic capacitors. The ESRs of most
aluminum electrolytics are too large to deliver low output
ripple. Tantalum and newer, lower ESR organic electrolytic
capacitors intended for power supply use are suitable,
and the manufacturers will specify the ESR. The choice of
capacitor value will be based on the ESR required for low
ripple. Because the volume of the capacitor determines
Catch Diode
The catch diode (D1 in Figure 2) must have a reverse volt-
age rating greater than the maximum input voltage. The
average current of the catch diode is given by:
I DAVE = I OUT (1 – DC MIN )
A Schottky diode with a 1A average forward current rating
will suf?ce for most applications. The ON Semiconductor
MBRM120LT3 (20V) and MBRM130LT3 (30V) are good
choices; they have a tiny package with good thermal proper-
ties. Many vendors have suitable surface mount versions of
the 1N5817 (20V) and 1N5818 (30V) 1A Schottky diodes
such as the Microsemi UPS120.
Applications with large step down ratios and high output
currents may have more than 1A of average diode current.
The ON Semiconductor MBRS230LT3 or International Rec-
ti?er 20BQ030 (both 2A, 30V) would be good choices.
3506afc
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3506AIDHD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIDHD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 1.6A Step-Down Switching Regulator |
| LT3506AIFE#PBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3506AIFE#TRPBF | 功能描述:IC REG BUCK ADJ 1.6A DL 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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