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The L7987L device is a step-down monolithic switching regulator able to deliver up to 2 A DC. The output voltage adjustability ranges from 0.8 V to almost VIN. The embedded switchover feature on the VBIAS pin 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
- 2 A DC output current
- 4.5 V to 61 V operating input voltage
- RDS,ON = 300 mΩ typ.
- Adjustable fSW (250 kHz - 1.5 MHz)
- Low IQ-SHD (11 μA typ. from VIN)
- Low IQ (1 mA typ. - VIN 24 V - VOUT 3.3 V)
- Output voltage adjustable from 0.8 V to VIN
- Synchronization
- Adjustable soft-start time
- Adjustable current limitation
- Advanced bootstrap capacitor management for LDO operation
- VBIAS improves 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
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评估工具
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图片 产品型号 制造商 描述 
STEVAL-ISA198V1 ST 基于L7987L的2 A降压DC - DC开关稳压器（VIN = 4.5 V至60 V） 产品型号基于L7987L的2 A降压DC - DC开关稳压器（VIN = 4.5 V至60 V）
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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** |
|---|---|---|---|---|---|
| L7987L |
批量生产
|
HTSSOP16 | 工业 | Ecopack2 | |
| L7987LTR |
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 | |||||||||||
| L7987LTR | 6 distributors | 立即购买 |
批量生产
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EAR99 | NEC | Tape And Reel | HTSSOP16 | - | - | PHILIPPINES | 1.0 / 1k | |
| L7987L | 5 distributors | 立即购买 |
批量生产
|
EAR99 | NEC | Tube | HTSSOP16 | - | - | PHILIPPINES | 1.0 / 1k | |
