LM2794TLSLASHNOPB中文资料德州仪器数据手册PDF规格书

1FEATURES

2• Regulated Current Sources with ±0.5%

Matching between any Two Outputs

• High Efficiency 3/2 Boost Function

• 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

APPLICATIONS

• White LED Display Backlights

• White LED Keypad Backlights

• 1-Cell Li-Ion Battery-Operated Equipment

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.