Datasheet > LM2794

LM2794

更新时间： 2024-09-26 11:12:35

品牌	Logo	应用领域
德州仪器 - TI		开关电容器
页数	文件大小	规格书
23页	723K
描述
具有模拟和 PWM 亮度控制功能的电流调节开关电容器 LED 电源

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LM2794 数据手册

LM2794, LM2795

www.ti.com

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

FEATURES

APPLICATIONS

•

Regulated Current Sources with ±0.5%

Matching between any Two Outputs

•

White LED Display Backlights

White LED Keypad Backlights

•

High Efficiency 3/2 Boost Function

Drives One, Two, Three or four White LEDs

2.7V to 5.5V Input Voltage

1-Cell Li-Ion Battery-Operated Equipment

Including PDAs, Hand-Held PCs, Cellular

Phones

Up to 80mA Output Current

DESCRIPTION

Analog Brightness Control

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.

Active-Low or High Shutdown Input ('94/95)

Very Small Solution Size and no Inductor

2.3µA (typ.) Shutdown Current

325kHz Switching Frequency (min.)

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.

Constant Frequency Generates Predictable

Noise Spectrum

•

Thin DSBGA Package: 2.08mm X 2.403mm X

0.600mm High

Basic Application Circuit

P_OUT

V_IN

C_IN

C_HOLD

1mF

C1+

1mF

C1-

C2+

LED1

LM2794/95

LED2

LED3

C2-

LED4

I_SET

BRGT

GND

R_SET

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.

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.

12 3 4 5 6 7...23

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LM2794 替代型号

型号	品牌	替代类型	描述	数据表
LM27966	TI	功能相似	具有 I2C 兼容接口的白光 LED 驱动器
LM2796	TI	功能相似	具有 3/2x 开关电容器升压的双显示白光 LED 驱动器

与LM2794相关器件

型号	品牌	获取价格	描述	数据表
LM2794BL	NSC	获取价格	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM2794BL/NOPB	TI	获取价格	SWITCHED CAPACITOR REGULATOR, 675kHz SWITCHING FREQ-MAX, PBGA14, LEAD FREE, CSP-14
LM2794BLX	NSC	获取价格	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM2794TL	NSC	获取价格	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM2794TL/NOPB	TI	获取价格	具有模拟和 PWM 亮度控制功能的电流调节开关电容器 LED 电源 \| YPA \| 14
LM2794TLX	NSC	获取价格	Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control
LM2795	ETC	获取价格
LM27951	NSC	获取价格	White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
LM27951	TI	获取价格	输入电压范围为 2.8V-5.5V 的白光 LED 自适应 1.5X/1X 开关电容器电流
LM27951SD	NSC	获取价格	White LED Adaptive 1.5X/1X Switched Capacitor Current Driver

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