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参数资料
| 型号： | LT1308BCF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 1A 14TSSOP |
| 标准包装： | 95 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 1 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 1A |
| 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： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 14-TSSOP |
LT1308A/LT1308B
APPLICATIONS INFORMATION
SHDN PIN
The LT1308A/LT1308B SHDN pin is improved over the
LT1308. The pin does not require tying to V IN to enable
the device, but needs only a logic level signal. The voltage
on the SHDN pin can vary from 1V to 10V independent
of V IN . Further, ?oating this pin has the same effect as
grounding, which is to shut the device down, reducing
current drain to 1μA or less.
A cross plot of the low-battery detector is shown in
Figure 12. The LBI pin is swept with an input which var-
ies from 195mV to 205mV, and LBO (with a 100k pull-up
resistor) is displayed.
V LBO
1V/DIV
LOW-BATTERY DETECTOR
The low-battery detector on the LT1308A/LT1308B fea-
tures improved accuracy and drive capability compared
195
200
V LBI (mV)
205
1308 F12
to the LT1308. The 200mV reference has an accuracy of
± 2% and the open-collector output can sink 50μA. The
LT1308A/LT1308B low-battery detector is a simple PNP
input gain stage with an open-collector NPN output. The
negative input of the gain stage is tied internally to a 200mV
reference. The positive input is the LBI pin. Arrangement as
a low-battery detector is straightforward. Figure 10 details
hookup. R1 and R2 need only be low enough in value so
that the bias current of the LBI pin doesn’t cause large
errors. For R2, 100k is adequate. The 200mV reference
can also be accessed as shown in Figure 11.
5V
Figure 12. Low-Battery Detector
Input/Output Characteristic
START-UP
The LT1308A/LT1308B can start up into heavy loads, unlike
many CMOS DC/DC converters that derive operating voltage
from the output (a technique known as “bootstrapping”).
Figure 13 details start-up waveforms of Figure 1’s circuit
with a 20Ω load and V IN of 1.5V. Inductor current rises to
3.5A as the output capacitor is charged. After the output
reaches 5V, inductor current is about 1A. In Figure 14, the
R1
R2
100k
LBI
+
–
V IN
LT1308A
LT1308B
LBO
100k
TO PROCESSOR
load is 5Ω and input voltage is 3V. Output voltage reaches
5V in 500μs after the device is enabled. Figure 15 shows
start-up behavior of Figure 5’s SEPIC circuit, driven from a
9V input with a 10Ω load. The output reaches 5V in about
1ms after the device is enabled.
V BAT
200mV
INTERNAL
REFERENCE
R1 =
V LB – 200mV
2μA
GND
1308 F10
Figure 10. Setting Low-Battery Detector Trip Point
V OUT
2V/DIV
I L1
1A/DIV
V SHDN
5V/DIV
200k
V IN
V BAT
2N3906
LBO
LT1308A
1ms/DIV
1308 F13
V REF
200mV
10k
+
10μF
LBI
LT1308B
GND
Figure 13. 5V Boost Converter of Figure 1.
Start-Up from 1.5V Input into 20 Ω Load
1308 F11
Figure 11. Accessing 200mV Reference
1308abfb
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1308BCF#PBF | 功能描述:IC REG BOOST 5V 1A 14TSSOP 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 |
| LT1308BCF#TR | 功能描述:IC REG BOOST 5V 1A 14TSSOP 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: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 |
| LT1308BCF#TRPBF | 功能描述:IC REG BOOST 5V 1A 14TSSOP 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 |
| LT1308BCF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current, Micropower Single Cell, 600kHz DC/DC Converters |
| LT1308BCF-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Current, Micropower Single Cell, 600kHz DC/DC Converters |
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