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| 型号： | LT1611CS5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/12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
Start-Up/Soft-Start
The LT1611, starting from V OUT = 0V, reaches final voltage
in approximately 450 μ s after SHDN is pulled high, with
C OUT = 22 μ F, V IN = 5V and V OUT = – 5V. Charging the output
capacitor at this speed requires an inrush current of over
1A. If a longer start-up time is acceptable, a soft-start
circuit consisting of R SS and C SS , as shown in Figure 14,
can be used to limit inrush current to a lower value. Figure
15 pictures V OUT and input current, starting into a 33 ?
load, with R SS of 33k ? and C SS of 33nF. Input current,
measured at V IN , is limited to a peak value of 450mA as the
time required to reach final value increases to 700 μ s. In
Figure 16, C SS is increased to 0.1 μ F, resulting in a lower
peak input current of 240mA with a V OUT ramp time of
2.1ms. C SS can be increased further for an even slower
ramp, if desired. Diode D2 serves to quickly discharge C SS
when V SS is driven low to shut down the device. D2 can be
omitted, resulting in a “soft-stop” slow discharge of the
output capacitor.
V IN
CURRENT
PROBE
L1A
22 μ H
C2
1 μ F
L1B
22 μ H
5V
V SS
R SS
33k
+
C1
22 μ F
V IN
LT1611
SHDN
GND
SW
NFB
R1
29.4k
R2
C P
1200pF
D1
V OUT
–5V
C3
22 μ F
D2
1N4148
10k
C SS
33nF/0.1 μ F
V OUT
C1: AVX TAJB226M010
C2: TAIYO YUDEN LMK212BJ105MG
C3: TAIYO YUDEN JMK325BJ226MM (1210 SIZE)
1611 F14
D1: MBR0520
L1: SUMIDA CLS62-220 OR 2 × MURATA LQH3C220 (UNCOUPLED)
Figure 14. R SS and C SS at SHDN Pin Provide Soft-Start to LT1611 Inverting Converter
V OUT
2V/DIV
I IN
200mA/DIV
V S
5V/DIV
V OUT
2V/DIV
I IN
200mA/DIV
V S
5V/DIV
LOAD = 150mA
500 μ s/DIV
1611 F15
LOAD = 150mA
500 μ s/DIV
1611 F16
Figure 15. R SS = 33k, C SS = 33nF; V OUT Reaches
– 5V in 750 μ s; Input Current Peaks at 450mA
Figure 16. R SS = 33k, C SS = 0.1 μ F; V OUT Reaches
– 5V in 2.1ms; Input Current Peaks at 240mA
9
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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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