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The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the VBIASpin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition. The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.
主要特性
- 3 A DC output current
- 4.5 V to 61 V operating input voltage
- RDS,ON= 250 mΩ typ.
- Adjustable fSW(250 kHz - 1.5 MHz)
- Low IQ-SHD (11 μA typ. from VIN)
- Low IQ (1 mA typ. - VIN24 V - VOUT3.3 V)
- Output voltage adjustable from 0.8 V to VIN
- Synchronization
- Adjustable soft-start time
- Adjustable current limitation
- Low dropout operation (12 μs max.)
- VBIASimproves efficiency at light load
- PGOOD open collector output
- Output voltage sequencing
- Digital frequency foldback in short-circuit
- Peak current foldback in short-circuit
- Auto-recovery thermal shutdown
精选 视频
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产品规格 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 02 Apr 2015 |
02 Apr 2015
|
技术文档 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 29 Oct 2015 |
29 Oct 2015
|
宣传册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 30 Jun 2020 |
30 Jun 2020
|
手册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 23 Mar 2020 |
23 Mar 2020
|
CAD/EDA Symbols, Footprints and Models
All resources
硬件型号、CAD库及SVD (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| ZIP | 02 Nov 2017 |
02 Nov 2017
|
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** |
|---|---|---|---|---|---|
| L7987 |
批量生产
|
HTSSOP16 | 工业 | Ecopack2 |
|
| L7987TR |
批量生产
|
HTSSOP16 | 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 。
eDesignSuite
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 | |||||||||||
| L7987TR | 3 distributors | 立即购买 |
批量生产
|
EAR99 | NEC | Tape And Reel | HTSSOP16 | - | - | PHILIPPINES | 1.25 / 1k | |
| L7987 | 5 distributors | 立即购买 |
批量生产
|
EAR99 | NEC | Tube | HTSSOP16 | - | - | PHILIPPINES | 1.25 / 1k | |
