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参数资料
| 型号： | L5980TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFPN-8 |
| 文件页数： | 31/42页 |
| 文件大小： | 1188K |
| 代理商： | L5980TR |
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L5980
Application ideas
Doc ID 13003 Rev 6
37/42
As in the positive one, in the inverting buck-boost the current flowing through the power
MOSFET is transferred to the load only during the OFF time. So according to the maximum
DC switch current (0.7 A), the maximum output current can be calculated from the Equation
32, where the duty cycle is given by Equation 36.
Figure 35.
Inverting buck-boost regulator
The GND pin of the device is connected to the output voltage so, given the output voltage,
input voltage range is limited by the maximum voltage the device can withstand across VCC
and GND (18 V). Thus if the output is -5 V the input voltage can range from 2.9 V to 13 V.
As in the positive buck-boost, the maximum output current according to application
conditions is shown in Figure 36. The dashed line considers a more accurate estimation of
the duty cycles given by Equation 37, where power losses across diodes and internal power
MOSFET are taken into account.
Equation 37
Figure 36.
Max output current according to max DC switch current (0.7 A): VO=-5 V
D
V
OUT
V
D
–
V
–
IN
V
SW
V
OUT
V
D
–
+
–
-----------------------------------------------------------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5980TR-CUT TAPE | 制造商:ST 功能描述:L5980 Series 15 V 250 kHz 0.7 A Step Down Switching Regulator - VFQFPN-8 |
| L5981 | 功能描述:直流/直流开关调节器 1A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5981_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1 A step-down switching regulator |
| L5981TR | 功能描述:直流/直流开关调节器 1a Step-Down Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L5983 | 功能描述:直流/直流开关调节器 1.5A STEP-DOWN SWITCHING REGULATOR RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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