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| 型号： | LM2794EVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 1/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION LM2794 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 80mA |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 4V |
| 特点： | 充电泵 |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | LM2794 |
| 相关产品： | LM2794TLX/NOPB-ND - IC LED DRVR WHT BCKLT 14USMD LM2794BLDKR-ND - IC LED DRVR WHT BCKLT 14USMD LM2794TL/NOPBCT-ND - IC LED DRVR WHT BCKLT 14MICROSMD LM2794TL/NOPBTR-ND - IC LED DRVR WHT BCKLT 14MICROSMD LM2794BLCT-ND - IC LED DRVR WHT BCKLT 14USMD LM2794BLTR-ND - IC LED DRVR WHT BCKLT 14USMD |
SNVS168L – JANUARY 2002 – REVISED MAY 2013
LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and
PWM Brightness Control
Check for Samples: LM2794 , LM2795
1
FEATURES
APPLICATIONS
2
?
Regulated Current Sources with ±0.5%
?
White LED Display Backlights
Matching between any Two Outputs
?
White LED Keypad Backlights
?
High Efficiency 3/2 Boost Function
?
1-Cell Li-Ion Battery-Operated Equipment
?
?
?
?
?
?
?
?
?
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Drives One, Two, Three or four White LEDs
2.7V to 5.5V Input Voltage
Up to 80mA Output Current
Analog Brightness Control
Active-Low or High Shutdown Input ('94/95)
Very Small Solution Size and no Inductor
2.3μA (typ.) Shutdown Current
325kHz Switching Frequency (min.)
Constant Frequency Generates Predictable
Noise Spectrum
Thin DSBGA Package: 2.08mm X 2.403mm X
0.600mm High
Including PDAs, Hand-Held PCs, Cellular
Phones
DESCRIPTION
The LM2794/95 is a fractional CMOS charge-pump
that provides four regulated current sources. It
accepts an input voltage range from 2.7V to 5.5V and
maintains a constant current determined by an
external sense resistor.
The LM2794/5 delivers up to 80mA of load current to
accommodate four White LEDs. The switching
frequency is 325kHz. (min.) to keep the conducted
noise spectrum away from sensitive frequencies
within portable RF devices.
Basic Application Circuit
V IN
P OUT
C IN
1 P F
C1+
C HOLD
1 P F
C1
1 P F
D1
C1-
C2+
D2
LED1
C2
1 P F
LM2794/95
D3
LED2
C2-
SD
D4
LED3
BRGT
I SET
LED4
GND
R SET
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright ? 2002–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
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| LM2794TL | 功能描述:IC LED DRVR WHT BCKLT 14MICROSMD RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LM2794TL/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM2794TLX | 功能描述:IC LED DRVR WHT BCKLT 14USMD RoHS:否 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| LM2794TLX/NOPB | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| LM2795 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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