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参数资料
| 型号： | LT1943EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SW QUAD TFT LCD 28-TSSOP |
| 标准包装： | 2,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 22 V |
| 输出数： | 4 |
| 输出电压： | 1.25 V ~ 40 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT1943
OPERATIO
maximum load current. For details of maximum output
current and discontinuous mode operation, see Linear
Technology’s Application Note AN44. Finally, for duty
cycles greater than 50% (V OUT /V IN > 0.5), a minimum
inductance is required to avoid subharmonic oscillations.
See AN19.
these equations to check that the LT1943 will be able to
deliver the required output current. Note again that these
equations assume that the inductor current is continuous.
Discontinuous operation occurs when I OUT is less than
? I L /2.
Table 1. Inductors.
The current in the inductor is a triangle wave with an
Part Number
Value ( μ H)
I RMS (A)
DCR ( ? ) Height (mm)
average value equal to the load current. The peak switch
Sumida
current is equal to the output current plus half the peak-to-
peak inductor ripple current. The LT1943 limits its switch
current in order to protect itself and the system from
overload faults. Therefore, the maximum output current
that the LT1943 will deliver depends on the switch current
limit, the inductor value, and the input and output voltages.
When the switch is off, the potential across the inductor is
the output voltage plus the catch diode drop. This gives the
peak-to-peak ripple current in the inductor:
? I L = (1 – DC)(V OUT + V F )/(L ? f),
where f is the switching frequency of the LT1943 and L is
the value of the inductor. The peak inductor and switch
current is
I SWPK = I LPK = I OUT + ? I L /2
To maintain output regulation, this peak current must be
less than the LT1943’s switch current limit of I LIM . For
SW1, I LIM is at least 2.4A at DC = 0.35 and decreases
linearly to 1.6A at DC = 0.8, as shown in the Typical
Performance Characteristics section. The maximum out-
put current is a function of the chosen inductor value:
I OUT(MAX) = I LIM – ? I L /2
= 3A ? (1 – 0.57 ? DC) – ? I L /2
Choosing an inductor value so that the ripple current is
small will allow a maximum output current near the switch
CR43-1R4
CR43-2R2
CR43-3R3
CR43-4R7
CDRH3D16-1R5
CDRH3D16-2R2
CDRH3D16-3R3
CDRH4D28-3R3
CDRH4D28-4R7
CDRH4D18-1R0
CDC5D23-2R2
CDRH5D28-2R6
Coilcraft
DO1606T-152
DO1606T-222
DO1606T-332
DO1606T-472
DO1608C-152
DO1608C-222
DO1608C-332
DO1608C-472
MOS6020-222
MOS6020-332
MOS6020-472
D03314-222
1008PS-272
1.4
2.2
3.3
4.7
1.5
2.2
3.3
3.3
4.7
1.0
2.2
2.6
1.5
2.2
3.3
4.7
1.5
2.2
3.3
4.7
2.2
3.3
4.7
2.2
2.7
2.52
1.75
1.44
1.15
1.55
1.20
1.10
1.57
1.32
1.70
2.50
2.60
2.10
1.70
1.30
1.10
2.60
2.30
2.00
1.50
2.15
1.8
1.5
1.6
1.3
0.056
0.071
0.086
0.109
0.040
0.050
0.063
0.049
0.072
0.035
0.03
0.013
0.060
0.070
0.100
0.120
0.050
0.070
0.080
0.090
0.035
0.046
0.050
0.200
0.140
3.5
3.5
3.5
3.5
1.8
1.8
1.8
3.0
3.0
2.0
2.5
3.0
2.0
2.0
2.0
2.0
2.9
2.9
2.9
2.9
2.0
2.0
2.0
1.4
2.7
current limit.
Toko
One approach to choosing the inductor is to start with the
simple rule given above, look at the available inductors,
(D62F)847FY-2R4M
(D73LF)817FY-2R2M
2.4
2.2
2.5
2.7
0.037
0.03
2.7
3.0
and choose one to meet cost or space goals. Then use
1943fa
12
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相关代理商/技术参数 |
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|---|---|
| LT1944 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| LT1944-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Micropower Step-Up DC/DC Converter |
| LT1944-1EMS | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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 |
| LT1944-1EMS#PBF | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1944-1EMS#TR | 功能描述:IC REG BST ADJ 0.1A/175MA 10MSOP 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 |
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