LT3465AES6 Linear Technology Corporation, LT3465AES6 Datasheet

LT3465AES6

Manufacturer Part Number

LT3465AES6

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LT3465A.pdf (16 pages)

2.LT3465AES6.pdf (12 pages)

Specifications of LT3465AES6

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APPLICATIO S

FEATURES

■

TYPICAL APPLICATIO

AND DIMMING

Inherently Matched LED Current

Drives Up to Six LEDs from a 3.6V Supply

No External Schottky Diode Required

1.2MHz Switching Frequency (LT3465)

2.4MHz Switching Frequency Above AM Broadcast

Band (LT3465A)

Automatic Soft-Start (LT3465)

Open LED Protection

High Efficiency: 81% (LT3465) 79% (LT3465A)

Typical

Requires Only 0.22µF Output Capacitor

Low Profile (1mm) SOT-23

Cellular Phones

PDAs, Handheld Computers

Digital Cameras

MP3 Players

GPS Receivers

SHUTDOWN

OUT(MAX)

CONTROL

3V TO 5V

Figure 1. Li-Ion Powered Driver for Four White LEDs

Range: 2.7V to 16V

= 30V

C1, C2: X5R OR X7R DIELECTRIC

L1: MURATA LQH32CN220

1µF

22µH

CTRL

LT3465A

LT3465/

GND

OUT

10Ω

3465A F01a

0.22µF

DESCRIPTIO

The LT

designed to drive up to six LEDs in series from a Li-Ion cell.

Series connection of the LEDs provides identical LED

currents and eliminates the need for ballast resistors.

These devices integrate the Schottky diode required exter-

nally on competing devices. Additional features include

output voltage limiting when LEDs are disconnected, one-

pin shutdown and dimming control. The LT3465 has

internal soft-start.

The LT3465 switches at 1.2MHz, allowing the use of tiny

external components. The faster LT3465A switches at

2.4MHz. Constant frequency switching results in low input

noise and a small output capacitor. Just 0.22µF is required

for 3-, 4- or 5-LED applications.

The LT3465 and LT3465A are available in the low profile

(1mm) 6-lead SOT-23 (ThinSOT

trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

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

3465/LT3465A are step-up DC/DC converters

LED Drivers with Built-in

1.2MHz/2.4MHz White

4 LEDs

Schottky in ThinSOT

= 3.6V

Conversion Efficiency

LED CURRENT (mA)

LT3465/LT3465A

) package.

LT3465

LT3465A

3465A F01b

3465afa

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