LTC3212EDDB#TRPBF Linear Technology, LTC3212EDDB#TRPBF Datasheet

IC LED DRIVER RGB 12-DFN

LTC3212EDDB#TRPBF

Manufacturer Part Number
LTC3212EDDB#TRPBF
Description
IC LED DRIVER RGB 12-DFN
Manufacturer
Linear Technology
Type
RGB LED Driverr
Datasheet

Specifications of LTC3212EDDB#TRPBF

Topology
Step-Up (Boost), Switched Capacitor (Charge Pump)
Number Of Outputs
3
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
RGB
Frequency
650kHz ~ 1.275MHz
Voltage - Supply
2.7 V ~ 5.5 V
Voltage - Output
5.1V
Mounting Type
Surface Mount
Package / Case
12-DFN
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
25mA
Internal Switch(s)
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC3212EDDB#TRPBFLTC3212EDDB
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC3212EDDB#TRPBFLTC3212EDDB#PBF
Manufacturer:
LT
Quantity:
793
FeaTures
applicaTions
Typical applicaTion
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6411531.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Power and Current Control for Driving RGB LEDs
Individually Programmable Current Sources
1x or 2x Mode, Low Noise, Constant Frequency
Charge Pump
Single Wire Enable Control for All LEDs
White Mode Adjusts R, G, B Currents for White Light
25mA Maximum LED Current
V
Automatic Soft-Start, Mode Switching and Output
Disconnect in Shutdown Mode
Available in 12-Lead (3mm × 2mm) DFN Package
Cellular Phones
Media Players
RGB Back Lights
IN
Range: 2.7V to 5.5V
2.7V TO 5.5V
V
IN
1µF
11.8k
RGB Power Supply and Current Control
V
LEDEN
I
I
I
SETB
SETR
SETG
IN
CM
LTC3212
1µF
CP
LEDR
LEDG
LEDB
DescripTion
CPO
The LTC
driver capable of driving three LEDs up to 25mA each
from a 2.7V to 5.5V input. Low external part count (one
flying capacitor, two bypass capacitors and one to three
programming resistors) makes the LTC3212 ideally suited
for small, battery-powered applications.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up and mode switching. High switching
frequency enables the use of small external capacitors.
The charge pump shuts down to a high impedance mode
to prevent LED leakage while the LTC3212 is off.
Each LED may be individually turned on or off via a single
pin interface. The current through the LEDs may be indi-
vidually programmed with resistors or may share a single
programming resistor. White mode adjusts the red, green
and blue LED current ratios for a white light when all three
LEDs are programmed to be on.
LED currents are regulated using internal low dropout
current sources. Automatic mode switching optimizes
efficiency by monitoring the LED current drivers and
switches mode only when dropout is detected. The part
is available in a 3mm × 2mm 12-lead DFN package.
R
LEDR
LEDG
LEDB
®
3212 is a low noise charge pump RGB LED
G
INDIVIDUAL
SETTINGS
15mA
15mA
15mA
RGB LED Driver and
B
13.5mA
11.2mA
WHITE
MODE
15mA
Charge Pump
3212 TA01a
1µF
LTC3212
3212fb


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LTC3212EDDB#TRPBF Summary of contents

Page 1

... Cellular Phones ■ Media Players ■ RGB Back Lights ■ , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6411531. Typical applicaTion V IN 2.7V TO 5.5V DescripTion ...

Page 2

LTC3212 absoluTe MaxiMuM raTinGs (Note GND ................................................... –0. CPO to GND ................................................. –0. LEDEN ............................................. –0. (Note 2) ..........................................................75mA CPO I (Note 2) .................................................30mA LED(R,G,B) CPO Short-Circuit Duration .............................. ...

Page 3

T PARAMETER 2x Mode Output Impedance CLK Frequency LEDEN High Level Input Voltage ( Low Level Input Voltage ( Input Current ( Input Current (I ) ...

Page 4

LTC3212 Typical perForMance characTerisTics 1x Mode Charge Pump Resistance vs Temperature 6 50mA CPO 6 5 3.6V 5 4.2V IN 4.0 3.5 3.0 –40 – ...

Page 5

FuncTions CP, CM (Pins 1, 11): Charge Pump Flying Capacitor Pins. A 1µF X5R or X7R ceramic capacitor should be connected from CP to CM. CPO (Pin 2): CPO is the output of the charge pump. A 1µF X5R ...

Page 6

LTC3212 block DiaGraM 900kHz OSCILLATOR LEDEN 3 3µA – SETB 4 – SETR 5 – SETG 6 operaTion The LTC3212 uses a switched capacitor charge pump to power three LEDs with ...

Page 7

An overcurrent shutdown mode on the I vent damage to the part and the LED by shutting down the LED drivers. Choosing an R SET will ensure that the part stays out of this mode. When in normal operating ...

Page 8

LTC3212 operaTion White Mode The LTC3212 has a white mode that automatically scales the current in the red, green and blue LEDs to a preset mix when selected. This allows the currents programmed with the external resistors to be set ...

Page 9

V , CPO Capacitor Selection IN The style and value of the capacitors used with the LTC3212 determine several important parameters such as regulator control loop stability, output ripple, charge pump strength and minimum start-up time. To reduce ...

Page 10

LTC3212 applicaTions inForMaTion Power Efficiency To calculate the power efficiency (η LED driver chip, the LED power should be compared to the input power. The difference between these two numbers represents lost power whether the ...

Page 11

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... High Current, Low Noise, White LED Driver LTC3217 600mA Low Noise Multi-LED Camera Light Charge Pump LT3465/ 1.2MHz/2.4MHz White LED Boost Converters with LT3465A Internal Schottky ThinSOT is a trademark of Linear Technology Corporation.  Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 1µF ...

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