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
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精选 视频
All resources
| Resource title | Latest update |
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产品规格 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 19 Sep 2016 | 19 Sep 2016 |
技术文档 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 20 Jan 2020 | 20 Jan 2020 |
Design Notes & Tips (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 16 Jul 2019 | 16 Jul 2019 |
手册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 23 Mar 2020 | 23 Mar 2020 |
EDA Symbols, Footprints and 3D Models
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.
Symbols
Footprints
3D models
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 | 从分销商订购 | 从ST订购 | 供货状态 | ECCN (US) | ECCN (EU) | 包装类型 | 封装 | 温度（ºC） | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | |||||||||||
| L7981A | 2 distributors | Buy Direct | 批量生产 | EAR99 | NEC | Tube | PowerSO-8 | -40 | 150 | PHILIPPINES | 0.678 / 1k | |
| L7981TR | 3 distributors | Free Sample Buy Direct | 批量生产 | EAR99 | NEC | Tape And Reel | QFN-8L P 0.5 mm | -40 | 150 | PHILIPPINES | 0.719 / 1k | |
| L7981ATR | 2 distributors | 批量生产 | EAR99 | NEC | Tape And Reel | PowerSO-8 | -40 | 150 | PHILIPPINES | 0.678 / 1k | ||
供货状态
批量生产ECCN (US)
EAR99Budgetary Price (US$)*/Qty
0.678 / 1k