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The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.
A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
The device is available in plastic dual in line, DIP-8 for standard assembly, and SO16W for SMD assembly.主要特性
- PROTECTION AGAINST FEEDBACK DISCONNECTION
- INHIBIT FOR ZERO CURRENT CONSUMPTION
- SOFT START FUNCTION
- THERMAL SHUTDOWN
- ZERO LOAD CURRENT OPERATION
- VOLTAGE FEEDFORWARD
- UP TO 2A STEP DOWN CONVERTER
- PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
- OPERATING INPUT VOLTAGE FROM 8V TO 55V
- SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
- INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUP MODE)
- OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V
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产品规格 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 19 Oct 2020 |
19 Oct 2020
|
应用手册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 13 Sep 2018 |
13 Sep 2018
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技术文档 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 29 Oct 2015 |
29 Oct 2015
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Design Notes & Tips (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 16 Jul 2019 |
16 Jul 2019
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手册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 23 Mar 2020 |
23 Mar 2020
|
CAD/EDA Symbols, Footprints and 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** |
|---|---|---|---|---|---|
| L4978 |
批量生产
|
DIP-8 | 工业 | Ecopack2 |
|
| L4978D |
批量生产
|
SO-16W | 工业 | Ecopack1 | |
| L4978D013TR |
批量生产
|
SO-16W | 工业 | Ecopack1 |
(**) 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 | |||||||||||
| L4978D013TR | 3 distributors | Free Sample Buy Direct |
批量生产
|
EAR99 | NEC | Tape And Reel | SO-16W | -40 | 150 | MALAYSIA | 1.389 / 1k | |
| L4978 | 7 distributors | Free Sample Buy Direct |
批量生产
|
EAR99 | NEC | Tube | DIP-8 | -40 | 150 | CHINA | 1.389 / 1k | |
| L4978D | 5 distributors | Buy Direct |
批量生产
|
EAR99 | NEC | Tube | SO-16W | -40 | 150 | MALAYSIA | 1.389 / 1k | |
