- 您现在的位置：买卖IC网 > PDF目录14855 > LT3503EDCB#TRMPBF (Linear Technology)IC REG BUCK ADJ 1A 6DFN PDF资料下载
参数资料
| 型号： | LT3503EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 16.2 V |
| 输入电压： | 3.6 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3503EDCB#TRMPBFDKR |
LT3503
APPLICATIO S I FOR ATIO
Ceramic capacitors have very low equivalent series resis-
tance (ESR) and provide the best ripple performance. A
good value is:
C OUT = 24/V OUT
where C OUT is in μ F. Use X5R or X7R types and keep in
mind that a ceramic capacitor biased with V OUT will have
less than its nominal capacitance. This choice will provide
low output ripple and good transient response. Transient
performance can be improved with a high value capacitor,
but a phase lead capacitor across the feedback resistor R1
may be required to get the full benefit (see the Compen-
sation section). Using a small output capacitor results in
an increased loop crossover frequency and increased
sensitivity to noise. A 22pF capacitor connected between
V OUT and the FB pin is required to filter noise at the FB pin
and ensure stability.
High performance electrolytic capacitors can be used for
the output capacitor. Low ESR is important, so choose
one that is intended for use in switching regulators. The
ESR should be specified by the supplier and should be
0.1 ? or less. Such a capacitor will be larger than a
ceramic capacitor and will have a larger capacitance, be-
cause the capacitor must be large to achieve low ESR.
Table 2 lists several capacitor vendors.
Figure 5 shows the transient response of the LT3503 with
a few output capacitor choices. The output is 3.3V. The
load current is stepped from 0.5A to 1.1A and back to 0.5A,
and the oscilloscope traces show the output voltage. The
upper photo shows the recommended value. The second
photo shows the improved response (less voltage drop)
resulting from a phase lead capacitor. The last photo
shows the response to a high performance electrolytic
capacitor. Transient performance is improved due to the
large output capacitance.
BOOST Pin Considerations
Capacitor C3 and diode D2 are used to generate a boost
voltage that is higher than the input voltage. In most cases
a 0.1 μ F capacitor and fast switching diode (such as the
1N4148 or 1N914) will work well. Figure 6 shows two
ways to arrange the boost circuit. The BOOST pin must be
at least 2.3V above the SW pin for best efficiency. For
outputs of 3.3V and above, the standard circuit (Figure 6a)
is best. For outputs between 3V and 3.3V, use a 0.22 μ F
capacitor. For outputs between 2.5V and 3V, use a 0.47 μ F
capacitor and a small Schottky diode (such as the BAT-54).
For lower output voltages tie a Schottky diode to the input
(Figure 6b). The circuit in Figure 6a is more efficient
because the BOOST pin current comes from a lower
voltage source. You must also be sure that the maximum
voltage rating of the BOOST pin is not exceeded.
Table 2. Capacitor Vendors
Vendor
Panasonic
Phone
(714) 373-7366
URL
www.panasonic.com
Part Series
Ceramic,
Comments
Polymer,
Tantalum
EEF Series
Kemet
Sanyo
(864) 963-6300
(408) 749-9714
www.kemet.com
www.sanyovideo.com
Ceramic,
Tantalum
Ceramic,
Polymer,
T494, T495
POSCAP
Tantalum
Murata
AVX
Taiyo Yuden
(404) 436-1300
(864) 963-6300
www.murata.com
www.avxcorp.com
www.taiyo-yuden.com
Ceramic
Ceramic,
Tantalum
Ceramic
TPS Series
3503f
11
相关PDF资料 |
PDF描述 |
|---|---|
| SLP392M080H3P3 | CAP ALUM 3900UF 80V 20% SNAP |
| LPX561M160C3P3 | CAP ALUM 560UF 160V 20% SNAP |
| GCM36DCCN-S189 | CONN EDGECARD 72POS R/A .156 SLD |
| ESRD121M06XB | CAP ALUM 120UF 6.3V 20% SMD |
| LLS2A222MELZ | CAP ALUM 2200UF 100V 20% SNAP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3504 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad 40V/1A Step-Down Switching Regulator |
| LT3504EUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
| LT3504EUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
| LT3504IUFD#PBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
| LT3504IUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN 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 |
发布紧急采购，3分钟左右您将得到回复。