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| 型号： | LT1304CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.2A 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： | 可调至 25V |
| 输入电压： | 1.5 V ~ 8 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 最高 300kHz |
| 电流 - 输出： | 200mA |
| 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 |
LT1304/LT1304-3.3/LT1304-5
OPERATIO
Table 1 lists inductor suppliers along with appropriate part
numbers.
Table 1. Recommended Inductors
I LIM Function
The LT1304’s current limit (I LIM ) pin can be used for soft
start. Upon start-up, the LT1304 will draw maximum
VENDOR
Sumida
Coiltronics
Dale
Coilcraft
SERIES
CD54, CD43
CTX20-1
LPT4545
DO3316, DO1608, DO3308
PHONE NUMBER
(708) 956-0666
(407) 241-7876
(605) 665-9301
(708) 639-6400
current (about 1A) from the supply to charge the output
capacitor. Figure 3 shows V OUT and V IN waveforms as the
device is turned on. The high current flow can create IR
drops along supply and ground lines or cause the input
supply to drop out momentarily. By adding R1 and C1 as
shown in Figure 4, the switch current is initially limited to
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors should
be used at the output of the LT1304 to minimize output
ripple voltage. High quality input bypassing is also re-
quired. For surface mount applications AVX TPS series
tantalum capacitors are recommended. These have been
specifically designed for switch mode power supplies and
have low ESR along with high surge current ratings. A
100 μ F, 10V AVX TPS surface mount capacitor typically
limits output ripple voltage to 70mV when stepping up
well under 1A as detailed in Figure 5. Current flowing into
C1 from R1 and the I LIM pin will eventually charge C1 and
R1 effectively takes C1 out of the circuit. R1 also provides
a discharge path for C1 when SHUTDOWN is brought low
for turn-off.
V OUT
2V/DIV
I IN
500mA/DIV
from 2V to 5V at a 200mA load. For through hole applica-
tions Sanyo OS-CON capacitors offer extremely low ESR
V SHDN
10V/DIV
1ms/DIV
1304 F03
in a small package size. Again, if peak switch current is
reduced using the I LIM pin, capacitor requirements can be
eased and smaller, higher ESR units can be used. Sug-
gested capacitor sources are listed in Table 2.
Figure 3. Start-Up Response. Input Current Rises Quickly to
1A. V OUT Reaches 5V in Approximately 1ms. Output Drives
20mA Load
Table 2. Recommended Capacitors
22 μ H*
MBRS130L
VENDOR
SERIES
TYPE
PHONE NUMBER
AVX
TPS
Surface Mount
(803) 448-9411
V IN
SW
Sanyo
Sprague
OS-CON
595D
Through Hole
Surface Mount
(619) 661-6835
(603) 225-1961
+
100 μ F
LBI
SENSE
LT1304-5
5V
200mA
Diode Selection
2 CELLS
LB0
GND
SHDN
I LIM
R1
1M
+
100 μ F
Best performance is obtained with a Schottky rectifier
such as the 1N5818. Motorola makes the MBRS130L
Schottky which is slightly better than the 1N5818 and
comes in a surface mount package. For lower switch
*SUMIDA CD54-220
+
C1
1 μ F
SHUTDOWN
1304 F04
currents, the MBR0530 is recommended. It comes in a
very small SOD-123 package. Multiple 1N4148s in parallel
can be used in a pinch, although efficiency will suffer.
Figure 4. 2-Cell to 5V/200mA Boost Converter Takes Four
External Parts. Components with Dashed Lines Are for
Soft Start (Optional)
7
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| LT1305CS8 | 功能描述:IC REG BOOST 5V 0.4A 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1305CS8#PBF | 功能描述:IC REG BOOST 5V 0.4A 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 |
| LT1305CS8#TR | 功能描述:IC REG BOOST 5V 0.4A 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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