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参数资料
| 型号： | LT1611CS5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/12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
Output Current
The LT1611 will deliver 150mA at – 5V from a 5V ± 10%
input supply. If a higher voltage supply is available, more
output current can be obtained. Figure 17’s schematic
shows how to get more current. Although the LT1611’s
maximum voltage allowed at V IN is 10V, the SW pin can
handle higher voltage (up to 36V). In Figure 17, the V IN pin
of the LT1611 is driven from a 5V supply, while input
inductor L 1A is driven from a separate 12V supply. Figure
18’s graph shows maximum recommended output cur-
rent as the voltage on L 1A is varied. Up to 300mA can be
delivered when driving L 1A from a 12V supply.
COMPONENT SELECTION
Inductors
Each of the two inductors used with the LT1611 should
have a saturation current rating (where inductance is
approximately 70% of zero current inductance) of ap-
proximately 0.25A or greater. If the device is used in
“charge pump” mode, where there is only one inductor,
then its rating should be 0.5A or greater. DCR of the
inductors should be 0.5 ? or less. A value of 22 μ H is
suitable if using a coupled inductor such as Sumida
CLS62-220 or Coiltronics CTX20-1. If using two separate
inductors, increasing the value to 47 μ H will result in the
same ripple current. Inductance can be reduced if operat-
ing from a supply voltage below 3V. Table 1 lists several
inductors that will work with the LT1611, although this is
not an exhaustive list. There are many magnetics vendors
whose components are suitable.
V L
(SEE TEXT)
5V
L1A
22 μ H
C2
1 μ F
L1B
22 μ H
350
300
C1
1 μ F
V IN
SHDN
LT1611
GND
SW
NFB
29.4k
10k
1200pF
D1
V OUT
–5V
UP TO 300mA
C3
22 μ F
250
200
150
C1, C2: TAIYO YUDEN LMK212BJ105MG
C3: TAIYO YUDEN JMK325BJ226MM
D1: MBR0520
1611 F17
100
3
4
5
6
7 8
V L (V)
9
10
11
12
L1A, L1B: SUMIDA CLS62-220
Figure 17. Increase Output Current By Driving L1A from a Higher Voltage
1611 F18
Figure 18. Output Current Increases to
300mA When Driving V L from 12V Supply
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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