产品概要
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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All features
- 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
特别推荐
EDA Symbols, Footprints and 3D Models
STMicroelectronics - L99LD21
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | 符合RoHS级别 | Material Declaration** |
|---|---|---|---|---|---|
| L99LD21Q6TR | NRND 不推荐用于新设计。量产仅供支持现有生产。 | VFQFPN 6X6 | Automotive | 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。
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Sample & Buy
| Part Number | 供货状态 | Budgetary Price (US$)*/Qty | 从ST订购 | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L99LD21Q6TR | | | distributors 无法联系到经销商，请联系我们的销售办事处 |
L99LD21Q6TR NRND