Datasheet Linear Technology LTC3205

Manufacturer	Linear Technology
Series	LTC3205

Multidisplay LED Controller

Datasheets

PDF, 258 Kb, File uploaded: Sep 27, 2017

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Packaging

	LTC3205EUF#PBF	LTC3205EUF#TRPBF
N	1	2
Package	4x4 QFN-24 Package Outline Drawing	4x4 QFN-24 Package Outline Drawing
Package Code	UF	UF
Package Index	05-08-1697	05-08-1697
Pin Count	24	24

Parametrics

Parameters / Models	LTC3205EUF#PBF	LTC3205EUF#TRPBF
Demo Boards	DC629A	DC629A
Design Tools	LTspice Model	LTspice Model
Export Control	no	no
Features	SPI Serial Control	SPI Serial Control
Frequency, kHz	800	800
Ishutdown, µA	1	1
Isupply, mA	0.05	0.05
Max Number of LEDs	4, 2, 1 RGB	4, 2, 1 RGB
Monolithic	yes	yes
Number of Outputs	7	7
Operating Temperature Range, °C	0 to 85	0 to 85
Output Current, A	0.25	0.25
Synchronous	no	no
Topology	Charge Pump, LED Driver	Charge Pump, LED Driver
Vin Max, V	4.5	4.5
Vin Min, V	2.8	2.8
Vout Max, V	4.5	4.5

Eco Plan

	LTC3205EUF#PBF	LTC3205EUF#TRPBF
RoHS	Compliant	Compliant

Articles

Download
White LED Driver Minimizes Space, Maximizes Efficiency and Flexibility &mdash LT Journal
PDF, 137 Kb, File published: Dec 1, 2003
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DESIGN FEATURES White LED Driver Minimizes Space,
Maximizes Efficiency and Flexibility
by Steven Martin Introduction White LEDs are the LCD backlight of
choice for portable equipment due to
their small profile, exceptional ruggedness and high luminosity. Li-Ion
batteries, also rugged and small, are
the popular power choice for the same
portable equipment. The white LEDs
have a nominal forward voltage between 3V and 4V and a Li-Ion battery
has a nominal voltage of 3.6V, thus
requiring circuitry to step-up the Li-Ion batteryвЂ™s voltage. The problem is,
stepping up tends to reduce efficiency,
which in turn reduces battery life. The
LTC3205 solves this problem by powering up in direct-connect mode rather
than step up mode. Once powered up,
it uses a dropout detector for each
white LED to determine if any are running out of drive. As the first white LED
just begins to lose current, the chip automatically engages a very powerful 2:
C1+ C1вЂ“ C2+ C2вЂ“ 5 4 6 3 800kHz
OSCILLATOR 25 PGND
15 CPO VIN 16
1:1 AND 2:3 CHARGE PUMP вЂ“
+ ENABLECP + …

Model Line

Series: LTC3205 (2)

LTC3205EUF#PBF LTC3205EUF#TRPBF

Manufacturer's Classification

Power Management > Inductorless (Charge Pump) DC/DC Converters > Inductorless (Charge Pump) LED Drivers

Slices

Microcontrollers