产品概述
描述
The L99LD21 is a flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a high efficiency monolithic boost controller and a dual buck converter.
The boost controller integrates a high current gate driver for an external n-channel mosfet. It delivers a constant output voltage, up to 60 V, which supplies the inputs of the two integrated or external buck converters.
The boost controller of two devices can be stacked, in order to operate in dual phase for high power applications, with an interleaving pattern for an improved input current ripple.
The buck converters integrate n-channel mosfet which is driven by a bootstrap circuit.
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所有功能
- AEC-Q100 qualified
- General
- ST SPI communication v4.1
- 5.5 to 24V Operating battery voltage range
- Load dump protected
- QFN40L (wettable flanks) with exposed pad
- Timeout watchdog and limp home function
- Low standby current
- Boost Section
- Fixed frequency architecture, programmable by SPI
- Peak current mode control
- Dual phase operation supported
- Input current limitation
- Soft start
- Overvoltage protection (OVP)
- Short feedback failure protection
- Constant voltage control
- Buck section
- Integrated switching mosfets
- Lossless current sensing without need of external components
- Very accurate LED current setting programming inductor's peak current and peak-to-peak current ripple
- Adjustable peak current by SPI
- Adjustable current ripple by SPI
- Integrated PWM generation unit with 10-bit resolution and phase shift
- Peak current control
- Constant VLED x TOFF architecture
- Protection and diagnostic
- Battery under voltage
- Temperature warning (2 thresholds)
- Overtemperature shutdown
- LED voltage digital feedback through SPI
- Buck outputs short circuit and open load protection
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EDA符号、封装和3D模型
STMicroelectronics - L99LD21
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符号
封装
3D模型
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** |
|---|---|---|---|---|---|
| L99LD21Q6 | NRND | VFQFPN 6X6 | 汽车应用 | Ecopack2 | |
| L99LD21Q6TR | 批量生产 | VFQFPN 6X6 | 汽车应用 | 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 | Order from distributors | 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 | |||||||||||
| L99LD21Q6TR | distributors 无法联系到经销商，请联系我们的销售办事处 | 批量生产 | EAR99 | NEC | Tape and Reel | VFQFPN 6X6 | - | - | THAILAND | | ||
| L99LD21Q6 | distributors 无法联系到经销商，请联系我们的销售办事处 | NRND | EAR99 | NEC | Tray | VFQFPN 6X6 | - | - | THAILAND | | ||