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| 型号： | LT1308BCS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 5V 1A 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 |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1308A/LT1308B
APPLICATIONS INFORMATION
12V
V OUT
5V/DIV
5V
I L1
1A/DIV
V SHDN
10V/DIV
that copper loss is minimized. Acceptable inductance
values range between 2μH and 20μH, with 4.7μH best for
most applications. Lower value inductors are physically
smaller than higher value inductors for the same current
capability.
Table 1 lists some inductors we have found to perform
well in LT1308A/LT1308B application circuits. This is not
50μs/DIV
1308 F17
an exclusive list.
Figure 17. Start-Up Waveforms of Figure 16’s Circuit
without Soft-Start Components
Table 1
VENDOR
PART NO.
VALUE
PHONE NO.
V OUT
12V
5V
I L1
Murata
Sumida
Coiltronics
Coilcraft
LQH6C4R7
CDRH734R7
CTX5-1
LPO2506IB-472
4.7μH
4.7μH
5μH
4.7μH
770-436-1300
847-956-0666
561-241-7876
847-639-6400
1A/DIV
5ms/DIV
V SHDN
10V/DIV
1308 F18
Figure 18. Start-Up Waveforms of Figure 16’s Circuit
with Soft-Start Components Added
COMPONENT SELECTION
Diodes
We have found ON Semiconductor MBRS130 and Inter-
national Recti?er 10BQ015 to perform well. For applica-
tions where V OUT exceeds 30V, use 40V diodes such as
MBRS140 or 10BQ040.
Height limited applications may bene?t from the use of the
MBRM120. This component is only 1mm tall and offers
performance similar to the MBRS130.
Capacitors
Equivalent Series Resistance (ESR) is the main issue
regarding selection of capacitors, especially the output
capacitors.
The output capacitors speci?ed for use with the LT1308A/
LT1308B circuits have low ESR and are speci?cally
designed for power supply applications. Output voltage
ripple of a boost converter is equal to ESR multiplied by
switch current. The performance of the AVX TPSD227M006
220μF tantalum can be evaluated by referring to Figure 3.
When the load is 800mA, the peak switch current is approxi-
mately 2A. Output voltage ripple is about 60mV P-P , so the
ESR of the output capacitor is 60mV/2A or 0.03Ω. Ripple
can be further reduced by paralleling ceramic units.
Table 2 lists some capacitors we have found to perform
well in the LT1308A/LT1308B application circuits. This is
not an exclusive list.
Inductors
Suitable inductors for use with the LT1308A/LT1308B must
ful?ll two requirements. First, the inductor must be able
to handle current of 2A steady-state, as well as support
transient and start-up current over 3A without inductance
decreasing by more than 50% to 60%. Second, the DCR
of the inductor should have low DCR, under 0.05Ω so
Table 2
VENDOR
AVX
AVX
Taiyo Yuden
Taiyo Yuden
SERIES
TPS
TPS
X5R
X5R
PART NO.
TPSD227M006
TPSD107M010
LMK432BJ226
TMK432BJ106
VALUE
220μF, 6V
100μF, 10V
22μF, 10V
10μF, 25V
PHONE NO.
803-448-9411
803-448-9411
408-573-4150
408-573-4150
1308abfb
13
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| LT1308BIS8 | 功能描述:IC REG BOOST 5V 1A 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 |
| LT1308BIS8#PBF | 功能描述:IC REG BOOST 5V 1A 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 |
| LT1308BIS8#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER BOOST 600KHZ 3A SOIC 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 600KHZ, 3A, SOIC |
| LT1308BIS8#TR | 功能描述:IC REG BOOST 5V 1A 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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