LM3501
- Synchronous Rectification, High Efficiency and no External Schottky Diode required
- Uses Small Surface Mount Components
- Can Drive 2-5 White LEDs in Series (May Function with More Low VF LEDs)
- 2.7V to 7V Input Range
- True Shutdown Isolation, no LED Leakage Current
- DC Voltage LED Current Control
- Input Undervoltage Lockout
- Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required LM3501-16: 15.5V OVP; LM3501-21: 20.5V OVP.
- Requires Only a Small 16V (LM3501-16) or 25V (LM3501-21) Ceramic Capacitor at the Input and Output
- Thermal Shutdown
- 0.1µA shutdown Current
- Small 8-Bump Thin DSBGA Package
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The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully integrated synchronous switching (no external schottky diode required) and a low feedback voltage (515 mV), power efficiency of the LM3501 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3501 operates with a fixed 1 MHz switching frequency. When used with ceramic input and output capacitors, the LM3501 provides a small, low-noise, low-cost solution.
Two LM3501 options are available with different output voltage capabilities. The LM3501-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3501-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3501 uses internal protection circuitry on the output to prevent a destructive overvoltage event.
A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted by varying the analog control voltage on the control pin or by using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3501 completely disconnects the input from output, creating total isolation and preventing any leakage currents from trickling into the LEDs.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | LM3501 Synchronous Step-up DC/DC Converter for White LED Applications 数据表 (Rev. C) | 2013年 5月 2日 | |||
白皮书 | 常见 LED 功能和 LED 驱动器设计注意事项 | 英语版 | 2020年 9月 21日 | |||
EVM 用户指南 | AN-1318 LM3501 Evaluation Board (Rev. A) | 2013年 4月 30日 |
设计和开发
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LM3501TL-16EV — 用于白光 LED 应用的同步升压 DC DC 转换器
A high efficiency synchronous step-up DC/DC converter with analog brightness control designed for white LED applications.
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封装 | 引脚 | CAD 符号、封装和 3D 模型 |
---|---|---|
DSBGA (YZR) | 8 | Ultra Librarian |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
- 制造厂地点
- 封装厂地点