LTC3212
RGB LED Driver and
Charge Pump
Fae Tseru Dpircse Tnoi
Power and Current Control for Driving RGB LEDs
The LTC 3212 is a low noise charge pump RGB LED
Individually Programmable Current Sources
driver capable of driving three LEDs up to 25mA each
1x or 2x Mode, Low Noise, Constant Frequency
from a 2.7V to 5.5V input. Low external part count (one
Charge Pump
flying capacitor, two bypass capacitors and one to three
Single Wire Enable Control for All LEDs
programming resistors) makes the LTC3212 ideally suited
White Mode Adjusts R, G, B Currents for White Light
for small, battery-powered applications.
25mA Maximum LED Current
Built-in soft-start circuitry prevents excessive inrush cur-
V Range: 2.7V to 5.5V
IN
rent during start-up and mode switching. High switching
Automatic Soft-Start, Mode Switching and Output
frequency enables the use of small external capacitors.
Disconnect in Shutdown Mode
The charge pump shuts down to a high impedance mode
Available in 12-Lead (3mm 2mm) DFN Package
to prevent LED leakage while the LTC3212 is off.
Each LED may be individually turned on or off via a single
a acilpp Tsnoi
pin interface. The current through the LEDs may be indi-
Cellular Phones
vidually programmed with resistors or may share a single
Media Players
programming resistor. White mode adjusts the red, green
RGB Back Lights
and blue LED current ratios for a white light when all three
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
LEDs are programmed to be on.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6411531.
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.
T lacipy a acilpp Tnoi
RGB Power Supply and Current Control
1F
CM CP
V
IN
V CPO
IN
2.7V TO 5.5V
LTC3212
1F
1F
R G B
LEDR
LEDG
LEDEN
LEDB
I
SETB
I
SETR
INDIVIDUAL WHITE
I
SETG
SETTINGS MODE
11.8k
LEDR 15mA 13.5mA
LEDG 15mA 15mA
LEDB 15mA 11.2mA
3212 TA01a
3212fb
LTC3212
a ulosb T e Mixa Mu M r a Tni Gs p ni noc Fi Garu Tnoi
(Note 1)
V to GND ................................................... 0.3V to 6V TOP VIEW
IN
CPO to GND ................................................. 0.3V to 6V
CP 1 VIN
12
LEDEN ............................................. 0.3V to V + 0.3V CPO 2 11 CM
IN
LEDEN 3 10 GND
I (Note 2) ..........................................................75mA
CPO
13
I 4 9 LEDB
SETB
I (Note 2) .................................................30mA
LED(R,G,B)
I 5 8 LEDR
SETR
CPO Short-Circuit Duration .............................. Indefinite
I 7 LEDG
6
SETG
Operating Temperature Range
DDB PACKAGE
(Notes 3, 4) .......................................... 40C to 85C
12-LEAD (3mm 2mm) PLASTIC DFN
T = 125C, = 76C/W
JMAX JA
Storage Temperature Range ................... 65C to 125C
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ro D re ni Fro Ma Tnoi
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3212EDDB#PBF LTC3212EDDB#TR LCWM 12-Lead (3mm 2mm) Plastic DFN 40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: