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參數(shù)資料
| 型號(hào)： | LM3500TL-16 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Synchronous Step-up DC/DC Converter for White LED |
| 中文描述： | LED DISPLAY DRIVER, BGA8 |
| 封裝： | MICRO, SMD-8 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大?。?/td> | 1072K |
| 代理商： | LM3500TL-16 |
LM3500
Synchronous Step-up DC/DC Converter for White LED
Applications
General Description
The LM3500 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 (500mV), power efficiency of the
LM3500 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 LM3500 oper-
ates with a fixed 1MHz switching frequency. When used with
ceramic input and output capacitors, the LM3500 provides a
small, low-noise, low-cost solution.
Two LM3500 options are available with different output volt-
age capabilities. The LM3500-21 has a maximum output
voltage of 21V and is typically suited for driving 4 or 5 white
LEDs in series. The LM3500-16 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 LM3500 uses internal protec-
tion circuitry on the output to prevent a destructive over-
voltage event.
A single external resistor is used to set the maximum LED
current in LED-drive applications. The LED current can eas-
ily be adjusted using a pulse width modulated (PWM) signal
on the shutdown pin. In shutdown, the LM3500 completely
disconnects the input from output, creating total isolation and
preventing any leakage currents from trickling into the LEDs.
Features
n
Synchronous rectification, high efficiency and no
external schottky diode required
n
Uses small surface mount components
n
Can drive 2-5 white LEDs in series
(may function with more low-V
F
LEDs)
n
2.7V to 7V input range
n
Internal output over-voltage protection (OVP) circuitry,
with no external zener diode required
LM3500-16: 15.5V OVP; LM3500-21: 20.5V OVP.
n
True shutdown isolation
n
Input undervoltage lockout
n
Requires only small ceramic capacitors at the input and
output
n
Thermal Shutdown
n
0.1μA shutdown current
n
Small 8-bump thin micro SMD package
Applications
n
LCD Bias Supplies
n
White LED Backlighting
n
Handheld Devices
n
Digital Cameras
n
Portable Applications
Typical Application Circuit
20065701
February 2005
S
2005 National Semiconductor Corporation
DS200657
www.national.com
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| LM3500TL-21 | Synchronous Step-up DC/DC Converter for White LED |
| LM3500TLX-21 | Synchronous Step-up DC/DC Converter for White LED |
| LM3500TLX-16 | Synchronous Step-up DC/DC Converter for White LED |
| LM3502SQX-35 | Step-Up Converter for White LED Applications |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3500TL-16/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3500TL-16EV | 功能描述:電源管理IC開發(fā)工具 LM3500TL-16 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3500TL-21 | 制造商:Texas Instruments 功能描述:LED DRVR 3Segment 3.3V/5V 8-Pin uSMD T/R |
| LM3500TL-21/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3500TLX-16 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Step-up DC/DC Converter for White LED |
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