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LM3501TLX-16 PDF预览

LM3501TLX-16

更新时间： 2024-11-18 22:10:27
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器
页数 文件大小 规格书
18页 1035K
描述
Synchronous Step-up DC/DC Converter for White LED Applications

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LM3501TLX-16 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：MICRO, SMD-8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.03接口集成电路类型：LED DISPLAY DRIVER
JESD-30 代码：S-PBGA-B8JESD-609代码：e0
长度：1.92 mm湿度敏感等级：1
功能数量：1端子数量：8
封装主体材料：PLASTIC/EPOXY封装代码：VFBGA
封装形状：SQUARE封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：0.675 mm表面贴装：YES
温度等级：OTHER端子面层：Tin/Lead (Sn63Pb37)
端子形式：BALL端子节距：0.5 mm
端子位置：BOTTOM处于峰值回流温度下的最长时间：40
宽度：1.92 mmBase Number Matches：1

LM3501TLX-16 数据手册

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May 2005  
LM3501  
Synchronous Step-up DC/DC Converter for White LED  
Applications  
General Description  
Features  
n Synchronous rectification, high efficiency and no  
external schottky diode required  
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 intergrated synchro-  
nous 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 oper-  
ates 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.  
n Uses small surface mount components  
n Can drive 2-5 white LEDs in series (may function with  
more low VF LEDs)  
n 2.7V to 7V input range  
n True shutdown isolation, no LED leakage current  
n DC voltage LED current control  
n Input undervoltage lockout  
n Internal output over-voltage protection (OVP) circuitry,  
with no external zener diode required LM3501-16: 15.5V  
OVP; LM3501-21: 20.5V OVP.  
n Requires only a small 16V (LM3501-16) or 25V  
(LM3501-21) ceramic capacitor at the input and output  
n Thermal Shutdown  
Two LM3501 options are available with different output volt-  
age 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 protec-  
tion circuitry on the output to prevent a destructive overvolt-  
age event.  
n 0.1µA shutdown current  
n Small 8-bump thin micro SMD package  
Applications  
n LCD Bias Supplies  
n White LED Back-Lighting  
n Handheld Devices  
n Digital Cameras  
A single external resistor is used to set the maximum LED  
current in LED-drive applications. The LED current can eas-  
ily 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 com-  
pletely disconnects the input from output, creating total iso-  
lation and preventing any leakage currents from trickling into  
the LEDs.  
n Portable Applications  
Typical Application Circuit  
20065301  
FIGURE 1. Typical 3 LED Application  
© 2005 National Semiconductor Corporation  
DS200653  
www.national.com  
1234567...18

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