- 您现在的位置：买卖IC网 > PDF目录39408 > LTC1503CMS8-2#TR (LINEAR TECHNOLOGY CORP) 1-OUTPUT DC-DC REG PWR SUPPLY MODULE PDF资料下载
参数资料
| 型号： | LTC1503CMS8-2#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 11/12页 |
| 文件大小： | 187K |
| 代理商： | LTC1503CMS8-2#TR |
8
LTC1503-1.8/LTC1503-2
2ms/DIV
1503-1.8/2 F02b
LTC1503-2
CSS = 0nF
COUT = 10F
RLOAD = 50
Capacitor Selection
For best performance, it is recommended that low ESR
capacitors be used for CIN and COUT to reduce noise and
ripple. If the ESR of the output capacitor is too high
(> 0.5
), both efficiency and output load regulation may
be degraded. The CIN and COUT capacitors should be either
ceramic or tantalum and should be 10
F or greater. If the
input source impedance is very low (< 0.5
), CIN may not
be needed. Ceramic capacitors are recommended for the
flying caps C1 and C2 with values of 0.47
F to 2.2F.
Smaller values may be used in low output current applica-
tions (e.g., IOUT < 10mA). For best performance choose
the same capacitance value for both C1 and C2.
Output Ripple
Normal LTC1503-X operation produces voltage ripple on
the VOUT pin. Output voltage ripple is required for the parts
to regulate. Low frequency ripple exists due to the hyster-
esis in the sense comparator and propagation delays in the
charge pump enable/disable circuits. High frequency ripple
is also present mainly from the ESR (equivalent series
resistance) in the output capacitor. Typical output ripple
(VIN = 3.6V) under maximum load is 25mV peak-to-peak
with a low ESR 10
F output capacitor.
The magnitude of ripple voltage depends on several fac-
tors. High input voltages increase the output ripple since
more charge is delivered to COUT per charging cycle. Large
output current load and/or a small output capacitor (< 10
F)
results in higher ripple due to higher output voltage dV/dt.
High ESR capacitors (ESR > 0.5
) on the output pin cause
high frequency voltage spikes on VOUT with every clock
cycle.
There are several ways to reduce the output voltage ripple
(see Figure 3). A larger COUT capacitor (22F or greater)
will reduce both the low and high frequency ripple due to
the lower COUT charging and discharging dV/dt and the
lower ESR typically found with higher value (larger case
size) capacitors. A low ESR ceramic output capacitor will
minimize the high frequency ripple, but will not reduce the
low frequency ripple unless a high capacitance value is
chosen. A reasonable compromise is to use a 10
Fto22F
tantalum capacitor in parallel with a 1
F to 3.3F ceramic
approximately 1.9V. Since the ramp rate on the SHDN/SS
pin controls the ramp rate on VOUT, the average inrush
current can be controlled through selection of CSS and
COUT. For example, a 4.7nF capacitor on SHDN/SS results
in a 4ms ramp time from 0.35V to 1.9V on the pin. If COUT
is 10
F, the 4ms VREF ramp time results in an average
COUT charge current of only 5mA (see Figure 2c).
5
1
RLOAD
CSS
1503-1.8/2 F02a
VCTRL
ON OFF
SHDN/SS
VOUT
LTC1503-X
(a)
VCTRL
2V/DIV
VOUT
1V/DIV
(b)
2ms/DIV
1503-1.8/2 F02b
LTC1503-2
CSS = 4.7nF
COUT = 10F
RLOAD = 50
VCTRL
2V/DIV
VOUT
1V/DIV
(c)
Figure 2. Shutdown/Soft-Start Operation
APPLICATIO S I FOR ATIO
WU
UU
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1517CS5-3.3#PBF | SWITCHED CAPACITOR REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO5 |
| LTC1522CS | 4-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16 |
| LTC1551CS-4.1 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO14 |
| LTC1551LCS8#TR-4.1 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC1550LCMS8#TR-2 | SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1503CS8-1.8 | 功能描述:IC REG BUCK SWITCHED CAP 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 |
| LTC1503CS8-1.8#PBF | 功能描述:IC REG BUCK SWITCHED CAP 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 |
| LTC1503CS8-1.8#TR | 功能描述:IC REG BUCK SWITCHED CAP 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 |
| LTC1503CS8-1.8#TRPBF | 功能描述:IC REG BUCK SWITCHED CAP 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:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LTC1503CS8-2 | 功能描述:IC REG BUCK SWITCHD CAP 2V 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: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 |
发布紧急采购，3分钟左右您将得到回复。