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参数资料
| 型号： | LT1940LEFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.4A DL 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1.25 V ~ 6.16 V |
| 输入电压： | 3.6 V ~ 7 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 1.4A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT1940/LT1940L
APPLICATIO S I FOR ATIO
V IN
GND
SW
(7a)
V IN
GND
SW
(7b)
V SW
V IN
SW
L1
I C1
C1
GND
D1
C2
(7c)
1940 F07
Figure 7. Subtracting the Current when the Switch is ON (a) From the Current when the Switch is OFF (b) Reveals the Path
of the High Frequency Switching Current (c) Keep This Loop Small. The Voltage on the SW and BOOST Nodes will also be
Switched; Keep these Nodes as Small as Possible. Finally, Make Sure the Circuit is Shielded with a Local Ground Plane.
Thermal Considerations
The PCB must also provide heat sinking to keep the
LT1940 cool. The exposed metal on the bottom of the
package must be soldered to a ground plane. This ground
should be tied to other copper layers below with thermal
vias; these layers will spread the heat dissipated by the
LT1940. Place additional vias near the catch diodes.
Adding more copper to the top and bottom layers and tying
this copper to the internal planes with vias can reduce
thermal resistance further. With these steps, the thermal
resistance from die (or junction) to ambient can be re-
duced to θ JA = 45 ° C/W.
The power dissipation in the other power components—
catch diodes, boost diodes and inductors, cause addi-
tional copper heating and can further increase what the IC
sees as ambient temperature. See the LT1767 data sheet’s
Thermal Considerations section.
Single, Low-Ripple 2.8A Output
The LT1940 can generate a single, low-ripple 2.8A output
V OUT1
VIA TO LOCAL GROUND PLANE
VIA TO V IN
GND
V OUT2
1940 F08
if the outputs of the two switching regulators are tied
together and share a single output capacitor. By tying the
two FB pins together and the two V C pins together, the two
channels will share the load current. There are several
Figure 8. A Good PCB Layout Ensures Proper Low EMI Operation
advantages to this two-phase buck regulator. Ripple cur-
rents at the input and output are reduced, reducing voltage
ripple and allowing the use of smaller, less expensive
1940fa
15
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| LT1941 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple Monolithic Switching Regulator |
| LT1941EFE | 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1941EFE#PBF | 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT1941EFE#TR | 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1941EFE#TRPBF | 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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