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| 型号： | LT1301CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V/12V 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V，12V |
| 输入电压： | 1.8 V ~ 10 V |
| PWM 型： | Burst Mode? |
| 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 |
LT1301
APPLICATIO N S I N FOR M ATIO N
V OUT
100mV/DIV
AC COUPLED
V SW
10V/DIV
I L
500mA/DIV
V OUT
5V/DIV
I IN
500mA/DIV
V SHDN
10V/DIV
20 μ s/DIV
LT1300 F4
200 μ s/DIV
LT1300 F5
V IN = 5V, V OUT = 12V, L = 33 μ H
C OUT = 33 μ F, I LOAD = 90mA
Figure 4. Burst Mode Operation in Action
V IN = 5V, V OUT = 12V
Figure 5. Start-Up Response
Output Voltage Selection
V IN
L1
33μH
D1
1N5817
The LT1301 can be selected to 5V or 12V under logic
control or fixed at either by tying Select to ground or V IN
respectively. It is permissible to tie Select to a voltage
3.3V OR 5V
+
V IN
SELECT
SW
SENSE
12V
higher than V IN as long as it does not exceed 10V.
Efficiency in 5V mode will be slightly less that in 12V mode
due to the fact that the diode drop is a greater percentage
of 5V than 12V. Since the bipolar switch in the LT1301 gets
47μF
SHUTDOWN
SHDN
GND
LT1301
I LIM
PGND
R1
1M
C3
0.1μF
+ C2
33μF
its base drive from V IN , no reduction in switch efficiency
occurs when in 5V mode. When V IN exceeds the pro-
grammed output voltage the output will follow the input.
This is characteristic of the simple step-up or “boost”
converter topology. A circuit example that provides a
regulated output with an input voltage above or below the
output (known as a buck-boost or SEPIC) is shown in the
V OUT
5VDIV
Figure 6.
LT1301 F6
Typical Applications section.
I IN
Shutdown
500mA/DIV
V SHDN
The converter can be turned off by pulling SHDN (pin 3)
high. Quiescent current drops to 10 μ A in this condition.
Bias current of 8 μ A to 10 μ A flows into the pin (at 5V input).
10V/DIV
V IN = 5V, V OUT = 12V
200 μ s/DIV
LT1300 F5
It is recommended that SHDN not be left floating. Tie the
pin to ground if the feature is not used. SHDN can be driven
high even if V IN is floating.
I LIM Function
The LT1301’s current limit (I LIM ) pin can be used for soft
start. Upon start-up, the LT1301 will draw maximum
current from the supply (about 1A) from the supply to
charge the output capacitor. Figure 5 shows V OUT and I 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
6
Figure 7. Startup Response Soft-Start Circuitry Added
adding R1 and C3 as shown in Figure 6, the switch
current in the LT1301 is initially limited to 400mA until
the 15 μ A flowing out of the I LIM pin charges up C3. Input
current is held to under 500mA while the output voltage
ramps up to 12V as shown in Figure 7. R1 provides a
discharge path for the capacitor without appreciably de-
creasing peak switch current. When using the I LIM pin soft-
start mode a minimum load of a few hundred microam-
peres is recommended to prevent C3 from discharging, as
no current flows out of I LIM when the LT1301 is not
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| LT1301I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower High Efficiency 5V/12V Step-Up DC/DC Converter for Flash Memory |
| LT1301IN8 | 功能描述:IC REG BOOST 5V/12V 8DIP 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 |
| LT1301IN8#PBF | 功能描述:IC REG BOOST 5V/12V 8DIP 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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| LT1301IS8 | 功能描述:IC REG BOOST 5V/12V 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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