产品概述
描述
The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.
The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.
Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.
The QFN and the HSOP packages with exposed pad allow reducing the RthJAdown to 60°C/W and 40°C/W respectively.
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所有功能
- 3 A DC output current
- 4.5 V to 28 V input voltage
- Output voltage adjustable from 0.6 V
- 250 kHz switching frequency, programmable up to 1 MHz
- Internal soft-start and enable
- Low dropout operation: 100% duty cycle
- Voltage feed-forward
- Zero load current operation
- Overcurrent and thermal protection
- VFQFPN 3 x 3 - 8L and HSOP8 package
电路原理图
eDesignSuite
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Thermal-electrical Simulators for Components
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Power Supply Design Tool
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AC Switches Simulator
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EDA符号、封装和3D模型
STMicroelectronics - L7981
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
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符号
封装
3D模型
质量与可靠性
| 产品型号 | Marketing Status | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| L7981A | 批量生产 | PowerSO-8 | 工业 | Ecopack2 | |
| L7981ATR | 批量生产 | PowerSO-8 | 工业 | Ecopack2 | |
| L7981TR | 批量生产 | QFN-8L P 0.5 mm | 工业 | Ecopack2 |
(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持。
样片和购买
| 产品型号 | 供货状态 | Budgetary Price (US$)*/Qty | 从ST订购 | Order from distributors | 封装 | 包装类型 | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | 温度（ºC） | Operating Temperature (°C) (min) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | |||||||||||||
| L7981A | | | distributors 无法联系到经销商，请联系我们的销售办事处 | PowerSO-8 | Tube | PHILIPPINES | EAR99 | NEC | -40 | 150 | -40 | |||
| L7981TR | | | distributors 无法联系到经销商，请联系我们的销售办事处 | QFN-8L P 0.5 mm | Tape and Reel | PHILIPPINES | EAR99 | NEC | -40 | 150 | -40 | |||
| L7981ATR | | | distributors 无法联系到经销商，请联系我们的销售办事处 | PowerSO-8 | Tape and Reel | PHILIPPINES | EAR99 | NEC | -40 | 150 | -40 | |||
L7981A 批量生产
L7981TR 批量生产
L7981ATR 批量生产