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参数资料
| 型号： | LT1308BCF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20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
Ceramic Capacitors
Multilayer ceramic capacitors have become popular, due
to their small size, low cost, and near-zero ESR. Ceramic
capacitors can be used successfully in LT1308A/LT1308B
designs provided loop stability is considered. A tantalum
capacitor has some ESR and this causes an "ESR zero" in
the regulator loop. This zero is bene?cial to loop stability.
Ceramics do not have appreciable ESR, so the zero is lost
when they are used. However, the LT1308A/LT1308B have
external compensation pin (V C ) so component values can
be adjusted to achieve stability. A phase lead capacitor can
also be used to tune up load step response to optimum
levels, as detailed in the following paragraphs.
Figure 19 details a 5V to 12V boost converter using either
a tantalum or ceramic capacitor for C2. The input capaci-
tor has little effect on loop stability, as long as minimum
capacitance requirements are met. The phase lead capaci-
Without C PL , load step response is pictured in Figure 22.
Although the output settles faster than the tantalum case,
there is appreciable ringing, again suggesting phase margin
is low. Figure 23 depicts load step response using the 10μF
ceramic output capacitor and C PL . Response is clean and
no ringing is evident. Ceramic capacitors have the added
bene?t of lowering ripple at the switching frequency due
to their very low ESR. By applying C PL in tandem with the
series RC at the V C pin, loop response can be tailored to
optimize response using ceramic output capacitors.
V OUT
500mV/DIV
I L1
1A/DIV
LOAD 500mA
CURRENT 50mA
tor C PL parallels feedback resistor R1. Figure 20 shows
200μs/DIV
1308 F20
load step response of a 50mA to 500mA load step using a
47μF tantalum capacitor at the output. Without the phase
lead capacitor, there is some ringing, suggesting the
phase margin is low. C PL is then added, and response to
the same load step is pictured in Figure 21. Some phase
margin is restored, improving the response. Next, C2 is
replaced by a 10μF, X5R dielectric, ceramic capacitor.
Figure 20. Load Step Response of LT1308B 5V to 12V
Boost Converter with 47μF Tantalum Output Capacitor
V OUT
500mV/DIV
V IN
5V
L1
4.7μH
D1
V OUT
12V
500mA
I L1
1A/DIV
LOAD 500mA
CURRENT 50mA
V IN
SW
200μs/DIV
1308 F21
SHDN
Figure 21. Load Step Response with 47μF Tantalum
LT1308B
R3
10k
R1
100k
C PL
330pF
Output Capacitor and Phase Lead Capacitor C PL
FB
C2
V C
GND
+
C1
47μF
R2
V OUT
500mV/DIV
47k
100pF
C1: AVX TAJC476M010
C2: AVX TPSD476M016 (47μF) OR
11.3k
I L1
1A/DIV
LOAD 500mA
CURRENT 50mA
TAIYO YUDEN TMK432BJ106MM (10μF)
D1: IR 10BQ015
1308 F19
200μs/DIV
1308 F22
L1: MURATA LQH6C4R7
Figure 22. Load Step Response with 10μF X5R
Figure 19. 5V to 12V Boost Converter
Ceramic Output Capacitor
1308abfb
14
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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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