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参数资料
| 型号： | LT1308BCF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20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
Waveforms for a LT1308B 5V to 12V boost converter using
a 10μF ceramic output capacitor are pictured in Figures 4
and 5. In Figure 4, the converter is operating in continuous
mode, delivering a load current of approximately 500mA.
The top trace is the output. The voltage increases as induc-
tor current is dumped into the output capacitor during the
switch off time, and the voltage decreases when the switch
is on. Ripple voltage is in this case due to capacitance,
as the ceramic capacitor has little ESR. The middle trace
is the switch voltage. This voltage alternates between a
V CESAT and V OUT plus the diode drop. The lower trace is
the switch current. At the beginning of the switch cycle,
the current is 1.2A. At the end of the switch on time, the
current has increased to 2A, at which point the switch turns
off and the inductor current ?ows into the output capacitor
through the diode. Figure 5 depicts converter waveforms
at a light load. Here the converter operates in discontinu-
ous mode. The inductor current reaches zero during the
switch off time, resulting in some ringing at the switch
LAYOUT HINTS
The LT1308A/LT1308B switch current at high speed, man-
dating careful attention to layout for proper performance.
You will not get advertised performance with careless
layout. Figure 6 shows recommended component place-
ment for an SO-8 package boost (step-up) converter. Follow
this closely in your PC layout. Note the direct path of the
switching loops. Input capacitor C1 must be placed close
(< 5mm) to the IC package. As little as 10mm of wire or PC
trace from C IN to V IN will cause problems such as inability
to regulate or oscillation.
The negative terminal of output capacitor C2 should tie
close to the ground pin(s) of the LT1308A/LT1308B. Doing
this reduces dI/dt in the ground copper which keeps high
frequency spikes to a minimum. The DC/DC converter
ground should tie to the PC board ground plane at one place
only, to avoid introducing dI/dt in the ground plane.
node. The ring frequency is set by switch capacitance,
diode capacitance and inductance. This ringing has little
GROUND PLANE
LBI LBO
energy, and its sinusoidal shape suggests it is free from
harmonics. Minimizing the copper area at the switch node
C1
+
V IN
will prevent this from causing interference problems.
R1
1
8
V OUT
100mV/DIV
R2
SHUTDOWN
2
3
LT1308A
LT1308B
7
6
L1
V SW
10V/DIV
4
5
I SW
500mA/DIV
500ns/DIV
1308 F04
MULTIPLE
VIAs
GND
C2
+
V OUT
D1
Figure 4. 5V to 12V Boost Converter Waveforms in
Continuous Mode. 10μF Ceramic Capacitor Used at Output
V OUT
20mV/DIV
V SW
10V/DIV
1308 F04
Figure 6. Recommended Component Placement for SO-8
Package Boost Converter. Note Direct High Current Paths
Using Wide PC Traces. Minimize Trace Area at Pin 1 (V C ) and
Pin 2 (FB). Use Multiple Vias to Tie Pin 4 Copper to Ground
Plane. Use Vias at One Location Only to Avoid Introducing
Switching Currents into the Ground Plane
I SW
500mA/DIV
Figure 7 shows recommended component placement for
500ns/DIV
1308 F05
a boost converter using the TSSOP package. Placement
Figure 5. Converter Waveforms in Discontinuous Mode
is similar to the SO-8 package layout.
1308abfb
9
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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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