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| 型号： | LT1611CS5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV ADJ 0.3A SOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -0.9 V ~ -10 V |
| 输入电压： | 0.9 V ~ 10 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 300mA |
| 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： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
LT1611
OPERATIO
V IN
5V
V IN
L1A
22 μ H
SW
C2
1 μ F
L1B
22 μ H
D1
–V OUT
Figure 8 shows the output voltage with a 50mA to 150mA
load step, using an AVX TAJ “B” case 22 μ F tantalum
capacitor at the output. Output perturbation is approxi-
mately 100mV as the load changes from 50mA to 150mA.
+
C1
SHDN
LT1611
GND
NFB
R1
R2
10k
C PL
C3
R L1
100 ?
R L2
50 ?
Steady-state ripple voltage is 20mV P–P , due to L1’s ripple
current and C3’s ESR. Step response can be improved by
adding a 3.3nF capacitor (C PL ) as shown in Figure 9.
Settling time improves from 150 μ s to 40 μ s, although
C1: AVX TAJB226M010
C2: TAIYO YUDEN LMK212BJ105MG
C3: SEE TEXT
D1: MBR0520
L1A, L1B: SUMIDA CLS62-220
Figure 7. Switching R L2 Provides 50mA to 150mA
Load Step for LT1611 5V to – 5V Converter
V OUT
50mV/DIV
AC COUPLED
1611 F07
steady-state ripple voltage does not improve. Figure 10
pictures the output voltage and switch pin voltage at
200ns per division. Note the absence of high frequency
spikes at the output. This is easily repeatable with proper
layout, described in the next section.
V OUT
20mV/DIV
AC COUPLED
LOAD CURRENT
150mA
50mA
LOAD CURRENT
150mA
50mA
100 μ s/DIV
Figure 8. Load Step Response of LT1611
with 22 μ F Tantalum Output Capacitor
1611 F08
20 μ s/DIV
Figure 9. Addition of C PL to Figure 7’s Circuit
Improves Load Step Response. C PL = 3.3nF
1611 F09
V OUT
10mV/DIV
SWITCH VOLTAGE
5V/DIV
LOAD = 150mA
200ns/DIV
1611 F10
Figure 10. 22 μ F “B” Case Tantalum Capacitor (AVX TAJ “B” Series)
Has ESR Resulting in 20mV P–P Voltage Ripple at Output
7
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相关代理商/技术参数 |
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| LT1611CS5TRMPBF | 制造商:Linear Technology 功能描述:1.4MHz Inverting Sw Reg. LT1611CS5M |
| LT1612 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Synchronous, Step-Down 800kHz PWM DC/DC Converter |
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| LT1612EMS8 | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8MSOP 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 |
| LT1612EMS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8MSOP 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 |
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