LTC3206EUF#TR Linear Technology, LTC3206EUF#TR Datasheet

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LTC3206EUF#TR

Manufacturer Part Number
LTC3206EUF#TR
Description
IC LED DRVR WT/RGB BCKLGT 24-QFN
Manufacturer
Linear Technology
Type
Backlight, White LED, RGB (I²C Interface)r
Datasheet

Specifications of LTC3206EUF#TR

Topology
PWM, Step-Up (Boost), Switched Capacitor (Charge Pump)
Number Of Outputs
11
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
RGB, White LED
Frequency
680kHz ~ 1.36MHz
Voltage - Supply
2.7 V ~ 4.5 V
Mounting Type
Surface Mount
Package / Case
24-QFN
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
400mA
Internal Switch(s)
Yes
Efficiency
92%
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Output
-

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Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3206EUF#TRLTC3206EUF
Manufacturer:
LT
Quantity:
10 000
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Part Number:
LTC3206EUF#TRLTC3206EUF
Manufacturer:
LINEAR/凌特
Quantity:
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Part Number:
LTC3206EUF#TRPBF
Manufacturer:
LTC
Quantity:
25 560
FEATURES
2.7V TO
TYPICAL APPLICATIO
APPLICATIO S
I
* U.S. Patent 6,411,531
2
INTERFACE
I
2
C is a trademark of Philips Electronics N.V.
4.5V
C SERIAL
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
Step-Up/Direct-Connect Fractional Charge Pump
Provides Up to 92% Efficiency
Up to 400mA Continuous Output Current
Independent Current and Dimming Control for
1-6 LED MAIN, 1-4 LED SUB and RGB LED Displays
LED Currents Programmable Using 2-Wire I
Serial Interface
1% LED Current Matching
Low Noise Constant Frequency Operation*
Minimal Component Count
Automatic Soft-Start Limits Inrush Current
16 Exponentially Spaced Dimming States Provides
128:1 Brightness Range for MAIN and SUB Displays
Up to 4096 Color Combinations for RGB Display
Low Operating Current: I
Tiny, Low Profile 24-Lead (4mm × 4mm × 0.75mm)
QFN Package
Cellular Phones
Wireless PDAs
Multidisplay Handheld Devices
IN
2.2µF
2
V
SERIAL PORT
IN
2.2µF
I
RGB
LTC3206
MAIN1-4
SUB1-2
2.2µF
U
I
AUX 1
AUX 2
MS
RGB
CPO
4
2
3
VIN
= 180µA
MAIN DISPLAY
U
2
C™
SUB DISPLAY
DESCRIPTIO
The LTC
troller. The part contains a high efficiency, low noise frac-
tional step-up/direct-connect charge pump to provide
power for both main and sub white LED displays plus an
RGB color LED display. The LTC3206 requires only four
small ceramic capacitors plus two resistors to form a
complete 3-display LED power supply and current
controller.
Maximum currents for the main/sub displays and RGB
display are set independently. Current for each LED is
controlled with an internal current source. Dimming and
ON/OFF control for all displays is achieved via a 2-wire
serial interface. Two auxiliary LED pins can be individually
assigned to either the MAIN or SUB displays. 16 individual
dimming states exist for both the MAIN and SUB displays.
Each of the RED, GREEN and BLUE LEDs have 16 dimming
states as well, resulting in up to 4096 color combinations.
The LTC3206 charge pump optimizes efficiency based on
V
up in direct-connect mode and automatically switches to
1.5x step-up mode once any enabled LED current source
begins to enter dropout. Internal circuitry prevents inrush
current and excess input noise during start-up and mode
switching. The LTC3206 is available in a 24-lead (4mm ×
4mm) QFN package.
IN
and LED forward voltage conditions. The part powers
RED
RGB ILLUMINATOR
®
3206 is a highly integrated multidisplay LED con-
GREEN BLUE
3206 TA01a
U
2.2µF
I
2
C Multidisplay
LED Controller
100
90
80
70
60
50
40
30
20
10
0
5-LED Main Display Efficiency
3.0
FIVE LEDs AT 15mA/LED
(TYP V
T
A
= 25°C
F
vs Input Voltage
AT 15mA = 3.2V)
3.3
INPUT VOLTAGE (V)
LTC3206
3.6
3.9
3206 TA01b
1
3206f
4.2

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LTC3206EUF#TR Summary of contents

Page 1

... Tiny, Low Profile 24-Lead (4mm × 4mm × 0.75mm) QFN Package U APPLICATIO S ■ Cellular Phones ■ Wireless PDAs Multidisplay Handheld Devices ■ , LTC and LT are registered trademarks of Linear Technology Corporation trademark of Philips Electronics N.V. * U.S. Patent 6,411,531 U TYPICAL APPLICATIO 2.2µF 2.2µF V ...

Page 2

LTC3206 ABSOLUTE AXI U RATI GS (Note CPO to GND............................... – 0. SDA, SCL, ENRGB/S ................. – 0.3V to (DV I (Continuous) (Note 4) ................................ 400mA CPO (Pulsed ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER CPO Regulation Voltage CLK Frequency SDA, SCL, ENRGB/S V Low Level Input Voltage IL V High Level Input Voltage IH I Input Current IH I Input Current IL V ...

Page 4

LTC3206 W U TYPICAL PERFOR A CE CHARACTERISTICS 1x Mode Switch Resistance vs Temperature 0 100mA CPO 0 3. 3. 3.9V IN 0.6 0.5 –40 – ...

Page 5

CTIO S SUB1, SUB2 (Pins 1, 2): Current Source Outputs for the SUB Display White LEDs. The current for the SUB display is controlled by the resistor on the I MS SUB display can be ...

Page 6

LTC3206 W BLOCK DIAGRA RGB SGND ENRGB/S 10 STOP SDA 8 SCL 9 U OPERATIO Power Management To optimize efficiency, the power management section of the LTC3206 provides ...

Page 7

U OPERATIO The 1.5x step-up charge pump uses a patented constant frequency architecture to combine the best efficiency with the maximum available power at the lowest noise level. The charge pump of the LTC3206 can be forced to come on ...

Page 8

LTC3206 U OPERATIO Byte Format Each byte sent to the LTC3206 must be 8 bits long followed by an extra clock cycle for the Acknowledge bit to be returned by the LTC3206. The data should be sent to the LTC3206 ...

Page 9

DIAGRA LTC3206 3206f 9 ...

Page 10

LTC3206 U U APPLICATIO S I FOR ATIO White LED Brightness Control The White LED displays (MAIN, SUB and AUX) have 16 individual brightness settings. The settings are exponen- tially spaced to compensate for the nearly logarithmic characteristic of human ...

Page 11

U U APPLICATIO S I FOR ATIO The RED, GREEN and BLUE pins can also enable the charge pump, however, since they each have individual disable control they can be left floating or grounded if unused. RGB Illuminator Brightness Control ...

Page 12

LTC3206 U U APPLICATIO S I FOR ATIO where f is the LTC3206’s oscillator frequency (typically OSC 960kHz) and C is the output charge storage capacitor CPO on CPO. Both the style and value of the output capacitor can significantly ...

Page 13

U U APPLICATIO S I FOR ATIO Table 4 shows a list of ceramic capacitor manufacturers and how to contact them: Table 4. Recommended Capacitor Vendors AVX www.avxcorp.com Kemet www.kemet.com Murata www.murata.com Taiyo Yuden www.t-yuden.com Vishay www.vishay.com For very light ...

Page 14

LTC3206 U U APPLICATIO S I FOR ATIO Once an LED pin drops out, the LTC3206 switches into step-up mode. Employing the fractional ratio 1.5x charge pump, the LTC3206 provides more efficiency than would be achieved with a voltage doubling ...

Page 15

... RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 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. ...

Page 16

... DC/DC Converter LTC3440 600mA (I ), 2MHz Synchronous Buck-Boost OUT DC/DC Converter LT3465/LT3465A 1.2MHz/2.7MHz with Internal Schottky ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 5-LED Main Plus Low/High Current Camera Light 2.2µ ...

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