LT3466EFE Linear Technology, LT3466EFE Datasheet

LT3466EFE

Manufacturer Part Number

LT3466EFE

Description

IC,Laser Diode/LED Driver,TSSOP,16PIN,PLASTIC

Manufacturer

Linear Technology

Datasheet

1.LT3466EFE.pdf (20 pages)

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FEATURES

TYPICAL APPLICATIO

APPLICATIO S

■

Drives Up to 20 White LEDs (10 in Series

per Converter) from a 3.6V Supply

Two Independent Step-Up Converters Capable of

Driving Asymmetric LED Strings

Independent Dimming and Shutdown Control

of the Two LED Strings

Internal Schottky Diodes

Internal Soft-Start Eliminates Inrush Current

Open LED Protection (39.5V Max V

Fixed Frequency Operation Up to 2MHz

81% Efficiency Driving 16 White LEDs at 15mA

(Eight per Driver) from a 3.6V Supply

Wide Input Voltage Range: 2.7V to 24V

Available in 10-Pin DFN and 16-Pin Thermally

Enhanced TSSOP Packages

Main/Sub Displays

Digital Cameras, Sub-Notebook PCs

PDAs, Handheld Computers

Automotive

LED1

10Ω

Figure 1. Li-Ion Powered Driver for 8/8 White LEDs

2.2µF

AND DIMMING

SHUTDOWN

CONTROL 1

OFF ON

47µH

FB1

CTRL1

SW1

OUT1

63.4k

3V TO 5V

LT3466

GND CTRL2

1µF

SW2

OUT

OUT2

SHUTDOWN

AND DIMMING

CONTROL 2

FB2

47µH

OFF ON

)

2.2µF

10Ω

3466 F01a

DESCRIPTIO

specifically designed to drive up to 20 White LEDs (10 in

series per converter) with a constant current. Series

connection of the LEDs provides identical LED currents

resulting in uniform brightness and eliminating the need

for ballast resistors and expensive factory calibration.

The two independent converters are capable of driving

asymmetric LED strings. The dimming of the two LED

strings can also be controlled independently. The LT3466

is ideal for providing backlight for main and sub-displays

in cell phones and other handheld devices.

The LT3466 operating frequency can be set with an

external resistor over a 200kHz to 2MHz range. A low

200mV feedback voltage minimizes power loss in the

current setting resistor for better efficiency. Additional

features include output voltage limiting when LEDs are

disconnected and internal soft-start.

The LT3466 is available in the 10-pin (3mm × 3mm ×

0.75mm) DFN and 16-pin thermally enhanced TSSOP

packages.

LED2

Dual Full Function White LED

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

3466 is a dual full function step-up DC/DC converter

Step-Up Converter with

Built-In Schottky Diodes

8/8 LEDs

= 3.6V

Conversion Efficiency

LED CURRENT (mA)

LT3466

3466 F01b

3466fa

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