參數(shù)資料
型號(hào)： LM2794BLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
中文描述： SWITCHED CAPACITOR REGULATOR, 675 kHz SWITCHING FREQ-MAX, PBGA14
封裝： CSP-14
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 487K
代理商： LM2794BLX
LM2794/LM2795
Current Regulated Switched Capacitor LED Supply with
Analog and PWM Brightness Control
General 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 80mAof load current to accom-
modate four White LEDs. The switching frequency is
325kHz. (min.) to keep the conducted noise spectrum away
from sensitive frequencies within portable RF devices.
Brightness can be controlled by both linear and PWM tech-
niques. A voltage between 0V and 3.0V may be applied to
the BRGT pin to linearly vary the LED current. Alternatively,
a PWM signal can be applied to the SD pin to vary the
perceived brightness of the LED. The SD pin reduces the
operating current to 2.3μA (typ.) The LM2794 is shut down
when the SD pin is low, and the LM2795 is shut down when
the SD pin is high.
The LM2794/95 is available in a micro SMD-14 CSP pack-
age.
Features
n
Regulated current sources with
±
0.5% matching
between any two outputs
n
High efficiency 3/2 boost function
n
Drives one, two, three or four white LEDs
n
2.7V to 5.5V Input Voltage
n
Up to 80mA output current
n
Analog brightness control
n
Active-low or high shutdown input (’94/95)
n
Very small solution size and no inductor
n
2.3μA (typ.) shutdown current
n
325kHz switching frequency (min.)
n
Constant Frequency generates predictable noise
spectrum
n
Standard Micro SMD-14 package: 2.08mm X 2.403mm
X 0.845mm High
n
Thin Micro SMD-14 package: 2.08mm X 2.403mm X
0.600mm High
Applications
n
White LED Display Backlights
n
White LED Keypad Backlights
n
1-Cell Li-Ion battery-operated equipment including
PDAs, hand-held PCs, cellular phones
Basic Application Circuit
20028503
March 2004
L
B
2004 National Semiconductor Corporation
DS200285
www.national.com
相關(guān)PDF資料
PDF描述
LM2794TL Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM2794 Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
LM27952SD White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
LM27952SDX White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2794EVAL 功能描述:電源管理IC開(kāi)發(fā)工具 EVAL KIT FOR LM2794 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
LM2794TL 功能描述:IC LED DRVR WHT BCKLT 14MICROSMD RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C
LM2794TL/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
LM2794TLX 功能描述:IC LED DRVR WHT BCKLT 14USMD RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C
LM2794TLX/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
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