LT3479EFE#PBF

更新时间： 2024-09-26 12:58:47

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
12页	124K
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LT3479EFE#PBF 数据手册

LTC3490

Single Cell 350mA

LED Driver

FEATURES

DESCRIPTIO

The LTC^®3490 provides a constant current drive for 1W

LED applications. It is a high efficiency boost converter

that operates from 1 or 2 NiMH or alkaline cells and

generates 350mA of constant current with up to 4V of

compliance. It contains a 100mΩ NFET switch and a

130mΩ PFET synchronous rectifier. The fixed switching

frequency is internally set to 1.3MHz.

■

350mA Constant Current Output

■

2.8V to 4V Output Compliance

■

1- or 2-Cell NiMH or Alkaline Input

■

Synchronous Rectification: Up to 90% Efficiency

■

Fixed Frequency Operation: 1.3MHz

■

Low Quiescient Current: <1mA

■

Very Low Shutdown Current: <50µA

■

Open LED Output Limited to 4.7V

TheLTC3490limitstheoutputvoltageto4.7Viftheoutput

load is disconnected. It also features an analog dimming

capability that reduces the drive current proportional to

the CTRL/SHDN pin voltage. A low-battery logic output

signals when the battery has dropped below 1V/cell. An

undervoltage lockout circuit shuts down the LTC3490

when the battery voltage drops below 0.85V/cell. The

feedbackloopisinternallycompensatedtominimizecom-

ponent count.

■

V_INRange: 1V to 3.2V

Dimming Control

■

Undervoltage Lockout to Protect Batteries

■

Low Profile (0.75mm) 3mm × 3mm Thermally

Enhanced 8-Lead DD and S8 Packages

APPLICATIO S

■

Portable Lighting

Rechargeable Flashlights

■

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

Efficiency vs V_INat V_LED= 3.5V

Single Cell Minimum Component LED Driver

100

3.3µH

= 350mA

OUT

CAP

ON/OFF

LTC3490

1 NiMH OR

ALKALINE

CELL

350mA

4.7µF

HIGH

CURRENT

LED

CTRL/SHDN LED

CELLS LOBAT

GND

3490 TA01

1.5

2.5

(V)

3490 TA02

3490f

12 3 4 5 6 7...12

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