LT3466EDD Linear Technology, LT3466EDD Datasheet

LT3466EDD

Manufacturer Part Number

LT3466EDD

Description

IC LED DRIVR WHITE BCKLGT 10-DFN

Manufacturer

Linear Technology

Type

Backlight, White LEDr

Datasheet

1.LT3466EDD.pdf (20 pages)

Specifications of LT3466EDD

Constant Current

Yes

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Automotive, Backlight

Type - Secondary

White LED

Frequency

200kHz ~ 2MHz

Voltage - Supply

2.7 V ~ 24 V

Mounting Type

Surface Mount

Package / Case

10-DFN

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

400mA

Internal Switch(s)

Yes

Efficiency

81%

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Voltage - Output

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT3466EDD#PBF

Manufacturer:

LINEAR/凌特

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LINEAR

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Part Number:

LT3466EDD#TRPBF

Manufacturer:

Quantity:

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Company:

Meier Automation Equipment Co., Limited

Part Number:

LT3466EDD#TRPBF

Manufacturer:

LT/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT3466EDD-1

Manufacturer:

Quantity:

10 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT3466EDD-1

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT3466EDD-1#PBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LT3466EDD-1#TRPBF

Manufacturer:

Quantity:

789

Company:

Meier Automation Equipment Co., Limited

Part Number:

LT3466EDD-1#TRPBF

Manufacturer:

LINEAR/凌特

Quantity:

20 000

Current page: 1 of 20
Download datasheet (486Kb)

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

Related parts for LT3466EDD

LT3466EDD Summary of contents

Page 1

... 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. , LTC and LT are registered trademarks of Linear Technology Corporation. 1µF L2 47µH SW2 ...

Page 2

... Maximum Junction Temperature ......................... 125°C Storage Temperature Range DFN .................................................. –65°C to 125°C TSSOP .............................................. –65°C to 150°C Lead Temperature (Soldering, 10 sec, TSSOP) ..... 300° ORDER PART NUMBER GND NC LT3466EDD V OUT1 SW1 V IN SW2 V DD PART MARKING OUT2 GND LBBH 16-LEAD PLASTIC TSSOP = 125° ...

Page 3

ELECTRICAL CHARACTERISTICS range, otherwise specifications are at T PARAMETER Converter 1 Current Limit Converter 2 Current Limit Converter 1 V CESAT Converter 2 V CESAT Switch 1 Leakage Current Switch 2 Leakage Current CTRL1 Voltage for Full LED Current CTRL2 ...

Page 4

LT3466 W U TYPICAL PERFOR A CE CHARACTERISTICS CTRL 250 25°C A 200 150 100 0.5 1 1.5 2 CONTROL VOLTAGE (V) 3466 G03 Switch Saturation Voltage ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS R vs Oscillator Frequency T 1000 100 10 200 600 1000 OSCILLATOR FREQUENCY (kHz) Oscillator Frequency vs Temperature 2500 V = 3.6V IN 2250 R T 2000 1750 1500 1250 R T 1000 ...

Page 6

LT3466 CTIO S (DD/TSSOP) V (Pin 1/Pin 3): Output of Converter 1. This pin is OUT1 connected to the cathode of the internal Schottky diode. Connect an output capacitor from this pin to ground. SW1 ...

Page 7

W BLOCK DIAGRA LT3466 3466fa 7 ...

Page 8

LT3466 U OPERATIO Main Control Loop The LT3466 uses a constant frequency, current mode control scheme to provide excellent line and load regula- tion. It incorporates two identical, but fully independent PWM converters. Operation can be best understood by referring ...

Page 9

U OPERATIO However, the other converter will continue functioning properly. The photo in Figure 4b shows circuit operation with converter 1 output open-circuit and converter 2 driv- ing eight LEDs at 20mA. Converter 1 starts switching at a lower peak ...

Page 10

LT3466 U U APPLICATIO S I FOR ATIO DUTY CYCLE The duty cycle for a step-up converter is given by – V OUT – V OUT D CESAT where: V ...

Page 11

U U APPLICATIO S I FOR ATIO INDUCTOR SELECTION The choice of the inductor will depend on the selection of the switching frequency of the LT3466. The switching frequency can be programmed from 200kHz to 2MHz. Higher switching frequency allows ...

Page 12

LT3466 U U APPLICATIO S I FOR ATIO Table 3. Inrush Peak Current V (V) L (µ OUT 0.22 Typically peak ...

Page 13

U U APPLICATIO S I FOR ATIO Figure 9 shows four LEDs being powered off two AA cells. The battery is connected to the inductors and the chip is powered off 3.3V logic supply voltage CELLS 1.8V to ...

Page 14

LT3466 U TYPICAL APPLICATIO S Li-Ion to 2/4 White LEDs 1µ 15µH 15µH SW1 V SW2 OUT1 OUT2 C OUT1 1µF LT3466 FB1 FB2 R R CTRL1 CTRL2 FB1 T ...

Page 15

U TYPICAL APPLICATIO S Li-Ion to 6/6 White LEDs 1µ 33µH 33µH SW1 V SW2 OUT1 OUT2 C OUT1 1µF LT3466 FB1 FB2 R CTRL1 CTRL2 T R FB1 OFF ...

Page 16

LT3466 U TYPICAL APPLICATIO S Li-Ion to 8/8 White LEDs 1µ 47µH 47µH SW1 V SW2 OUT1 OUT2 C OUT1 2.2µF LT3466 FB1 FB2 R CTRL1 CTRL2 T OFF ON ...

Page 17

U TYPICAL APPLICATIO S Li-Ion to 10/10 White LEDs 1µ 68µH 68µH SW1 V SW2 OUT1 OUT2 C OUT1 1µF LT3466 FB1 FB2 R CTRL1 CTRL2 T OFF ON OFF ...

Page 18

LT3466 U TYPICAL APPLICATIO S 2 Li-Ion Cells to 10/10 White LEDs 1µ 47µH 47µH SW1 V SW2 OUT1 OUT2 C OUT1 0.47µF LT3466 FB1 FB2 R CTRL1 CTRL2 T ...

Page 19

... DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 10-Lead Plastic DFN (3mm × ...

Page 20

... Low Noise, 1.5MHz, Regulated Charge Pump White LED Driver LTC3205/LTC3206 High Efficiency, Multidisplay LED Controller LT3465/LT3465A Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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