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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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Picture 产品型号 制造商 描述 
STEVAL-ISA198V1 ST 2 A step down DC - DC switching regulator (VIN = 4.5 V to 60 V) based on the L7987L 产品型号2 A step down DC - DC switching regulator (VIN = 4.5 V to 60 V) based on the L7987L
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| 产品型号 | 供货状态 | 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 。
