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| 型号： | LT1304CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16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
If the full power capability of the LT1304 is not required,
peak switch current can be limited by connecting a resistor
R LIM from the I LIM pin to ground. With R LIM = 22k, peak
switch current is reduced to approximately 500mA. Smaller
power components can then be used. The graph in Figure
6 shows switch current vs R LIM resistor value.
V OUT
2V/DIV
bypass capacitor is required. If the input supply is close to
the IC, a 1 μ F ceramic capacitor can be used instead. The
LT1304 switches current in 1A pulses, so a low impedance
supply must be available. If the power source (for example,
a 2 AA cell battery) is within 1 or 2 inches of the IC, the
battery itself provides bulk capacitance and the 1 μ F ce-
ramic capacitor acts to smooth voltage spikes at switch
turn-on and turn-off. If the power source is far away from
the IC, inductance in the power source leads results in high
impedance at high frequency. A local high capacitance
bypass is then required to restore low impedance at the IC.
I IN
500mA/DIV
V SHDN
10V/DIV
1ms/DIV
1304 F05
SHUTDOWN
Figure 5. Start-Up Response with 1 μ F/1M ? Components
in Figure 2 Added. Input Current Is More Controlled. V OUT
Reaches 5V in 6ms. Output Drives 20mA Load
1
8
2
LT1304
7
1000
900
V IN
3
4
6
5
800
C IN
700
V OUT
C OUT
600
500
GND (BATTERY AND LOAD RETURN)
400
10
100
R LIM (k ? )
1000
1304 F06
1304 F07
Figure 7. Suggested Layout for Best Performance. Input
Capacitor Placement as Shown Is Highly Recommended.
Figure 6. Peak Switch Current vs R LIM Value
Layout/Input Bypassing
The LT1304’s high speed switching mandates careful
attention to PC board layout. Suggested component place-
ment is shown in Figure 7. The input supply must have low
impedance at AC and the input capacitor should be placed
as indicated in the figure. The value of this capacitor
depends on how close the input supply is to the IC. In
situations where the input supply is more than a few
inches away from the IC, a 47 μ F to 100 μ F solid tantalum
8
Switch Trace (Pin 4) Copper Area Is Minimized
Low-Battery Detector
The LT1304 contains an independent low-battery detector
that remains active when the device is shut down. This
detector, actually a hysteretic comparator, has an open
collector output that can sink up to 500 μ A. The compara-
tor also operates below the switcher’s undervoltage lock-
out threshold, operating until V IN reaches approximately
1.4V. Figure 8 illustrates the input/output characteristic of
the detector. Hysteresis is clearly evident in the figure.
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相关代理商/技术参数 |
参数描述 |
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| LT1305 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower High Power DC/DC Converter with Low-Battery Detector |
| 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 |
| LT1305CS8#TRPBF | 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: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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