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参数资料
| 型号： | LT1300CS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 3.3V/5V 0.22A 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： | 3.3V，5V |
| 输入电压： | 1.8 V ~ 10 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 220mA |
| 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 |
LT1300
APPLICATIO N S I N FOR M ATIO N
Output Voltage Selection
The LT1300 can be selected to 3.3V or 5V under logic
L1
10μH
D1
control or fixed at either by tying SELECT to ground or V IN
respectively. It is permissible to tie SELECT to a voltage
higher than V IN as long as it does not exceed 10V.
Efficiency in 3.3V mode will be slightly less that in 5V mode
due to the fact that the diode drop is a greater percentage
+
C1
100μF
V IN
SELECT
SHDN
LT1300
SW
SENSE
I LIM
+
5V/3.3V
OUTPUT
C2
100μF
of 3.3V than 5V. Since the bipolar switch in the LT1300
gets its base drive from V IN , no reduction in switch
PGND
GND
R1
1M
C3
0.1μF
efficiency occurs when in 3.3V mode. When V IN exceeds
the programmed output voltage the output will follow the
input. This is characteristic of the simple step-up or
“boost” converter topology. A circuit example that pro-
vides a regulated output with an input voltage above or
below the output (called a buck-boost or SEPIC) is shown
in the Typical Applications section.
Figure 4. Addition of R1 and C3 Limit Input Current at Startup
V OUT
2VDIV
Shutdown
I BATTERY
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 3 μ A to 5 μ A flows into the pin (at 2.5V input).
It is recommended that SHDN not be left floating. Tie the
pin to ground if the feature is not used.
500mA/DIV
V SHDN
10V/DIV
500 μ s/DIV
REP RATE = 1Hz
LT1300 F5
I LIM Function
The LT1300’s current limit (I LIM ) pin can be used for soft
start. Upon start-up, switching regulators require maxi-
Figure 5. Startup Waveforms using Soft-Start Circuitry
I LOAD = 100mA, V OUT = 5V
mum current from the supply. The high currents flowing
can create IR drops along supply and ground lines and
are especially demanding on alkaline batteries. By in-
stalling an R1 and C3 as shown in Figure 4, the switch
current in the LT1300 is limited to 400mA until the 15 μ A
flowing out of the I LIM pin charges up the 0.1 μ F capaci-
tor. Input current is held to under 500mA while the
output voltage ramps up to 5V as shown in Figure 5. The
1Meg resistor provides a discharge path for the capacitor
without appreciably decreasing peak switch current. When
1100
1000
900
800
700
600
500
400
300
1 .6V ≤ VIN ≤ 5V
the full capability of the LT1300 is not required, peak
current can be reduced by changing the value of R3 as
100
1k
10k
R LIM ( ? )
100k
1M
LT1300 F1B
shown in Figure 6. With R3 = 0, switch current is limited
to approximately 400mA.
6
Figure 6. Peak Switch Current vs. R LIM
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相关代理商/技术参数 |
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| LT1301 | 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 |
| LT1301C | 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 |
| LT1301CN8 | 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: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 |
| LT1301CN8#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: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 |
| LT1301CN8PBF | 制造商:Linear Technology 功能描述:LT1301CN8PBF |
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