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| 型号： | LT1317CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.5A 8SOIC |
| 标准包装： | 2,500 |
| 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： | 0°C ~ 70°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 |
LT1317/LT1317B
APPLICATIO N S I N FOR M ATIO N
Table 1. Inductors Suitable for Use with the LT1317
to be adjusted to ensure a stable system for the entire input
MAX
HEIGHT
voltage range. Figure 4 shows a 2V to 3.3V converter with
PART
LQH3C100
VALUE
10 μ H
DCR
0.57
MFR
Murata-Erie
(mm)
2.0
COMMENT
Smallest Size,
new values for R C and C C . Figure 5 details transient
response for this circuit. Also, ceramic caps are prone to
DO1608-103 10 μ H
CD43-100 10 μ H
CD54-100 10 μ H
CTX32CT-100 10 μ H
0.16
0.18
0.10
0.50
Coilcraft
Sumida
Sumida
Coiltronics
3.0
3.2
4.5
2.2
Limited Current
Handling
Best Efficiency
1210 Footprint
temperature effects and the designer must check loop
stability over the operating temperature range (see section
on Frequency Compensation).
Input bypass capacitor ESR is less critical and smaller
units may be used. If the input voltage source is physically
near the V IN pin (<5mm), a 10 μ F ceramic or a 10 μ F A case
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors should
be used at the output of the LT1317. For most applications
a solid tantalum in a C or D case size works well. Accept-
able capacitance values range from 10 μ F to 330 μ F with
ESR falling between 0.1 ? and 0.5 ? . If component size is
an issue, tantalum capacitors in smaller case sizes can be
used but they have high ESR and output voltage ripple may
reach unacceptable levels.
Ceramic capacitors are an alternative because of their
combination of small size and low ESR. A 10 μ F ceramic
capacitor will work for some applications but the ex-
tremely low ESR of these capacitors may cause loop
stability problems. Compensation components will need
tantalum is adequate.
Diodes
Most of the application circuits on this data sheet specify
the Motorola MBR0520L surface mount Schottky diode.
In lower current applications, a 1N4148 can be used,
although efficiency will suffer due to the higher forward
drop. This effect is particularly noticeable at low output
voltages. For higher voltage output applications, such as
LCD bias generators, the extra drop is a small percentage
of the output voltage so the efficiency penalty is small. The
low cost of the 1N4148 makes it attractive wherever it can
be used. In through hole applications the 1N5818 is the all
around best choice.
V IN
2V
V IN
L1
10 μ H
SW
FB
D1
V OUT
3.3V
C1
10 μ F
LT1317B
SHDN
V C GND
R C
20k
C C
1500pF
R1
1M
1%
R2
604k
1%
C2
10 μ F
CERAMIC
V OUT
200mV/DIV
AC COUPLED
I LOAD
5mA TO
D1: MBR0520
L1: SUMIDA CD43-100
1317 F04
200mA
200 μ s/DIV
1317 F05
Figure 4. 2V to 3.3V Converter with a 10 μ F Ceramic Output
Figure 5. Transient Response for the Circuit of Figure 4.
Capacitor. R C and C C Have Been Adjusted to Give Optimum
Transient Response.
9
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相关代理商/技术参数 |
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| LT1317IS8 | 功能描述:IC REG BOOST ADJ 0.5A 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 |
| LT1317IS8#PBF | 功能描述:IC REG BOOST ADJ 0.5A 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: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 |
| LT1317IS8#TR | 功能描述:IC REG BOOST ADJ 0.5A 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 |
| LT1317IS8#TRPBF | 功能描述:IC REG BOOST ADJ 0.5A 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: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 |
| LT1319 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Modulation Standard Infrared Receiver |
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