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LT3466EDD Datasheet

  • LT3466EDD

  • Dual Full Function White LED Step-Up Converter with Built-In...

  • 325.28KB

  • 20頁

  • LINER

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LT3466
Dual Full Function White LED
Step-Up Converter with
Built-In Schottky Diodes
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
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 (42V Max V
OUT
)
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
Tiny (3mm
脳
3mm) 10-Lead DFN Package
LT
廬
3466 is a dual full function step-up DC/DC converter
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 a low profile, small footprint
(3mm
脳
3mm
脳
0.75mm) DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Main/Sub Displays
Digital Cameras, Sub-Notebook PCs
PDAs, Handheld Computers
Automotive
TYPICAL APPLICATIO
3V TO 5V
1碌F
47碌H
SW1
LED1
2.2碌F
LT3466
FB1
CTRL1
10鈩?/div>
SHUTDOWN
AND DIMMING
CONTROL 1
FB2
R
T
GND CTRL2
SHUTDOWN
AND DIMMING
CONTROL 2
10鈩?/div>
3466 F01a
85
80
47碌H
75
V
IN
SW2
V
OUT2
2.2碌F
LED2
EFFICIENCY (%)
V
OUT1
70
65
60
55
50
63.4k
0
Figure 1. Li-Ion Powered Driver for 8/8 White LEDs
3466f
U
Conversion Efficiency
V
IN
= 3.6V
8/8 LEDs
5
10
LED CURRENT (mA)
3466 F01b
U
U
15
20
1

LT3466EDD 產(chǎn)品屬性

  • LT3466

  • 121

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動(dòng)器

  • -

  • 是

  • -

  • 2

  • 是

  • 車載，背光

  • 白色 LED

  • 200kHz ~ 2MHz

  • 2.7 V ~ 24 V

  • -

  • 表面貼裝

  • 10-WFDFN 裸露焊盤

  • 10-DFN（3x3）

  • 管件

  • -40°C ~ 85°C

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