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Linear Technology Electronic Components Datasheet

LTC3220 Datasheet

360mA Universal 18-Channel LED Driver

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LTC3220 pdf
LTC3220/LTC3220-1
360mA Universal
18-Channel LED Driver
FEATURES
n Eighteen 20mA Universal Current Sources with
64-Step Linear Brightness Control
n Independent On/Off, Brightness Level, Blinking and
Gradation Control for Each Current Source Using
2-Wire I2C Interface
www.DataShneetL4Uo.wcoNmoise Multi-Mode Charge Pump (1x, 1.5x, 2x)
Provides Up to 91% Efficiency
n Slew Limited Switching Reduces Conducted and
Radiated Noise (EMI)
n Up to 360mA Total Output Current
n Internal Current Reference
n Single Reset Pin for Asynchronous Shutdown and
Reset of All Data Registers
n Two I2C Addresses Are Available (LTC3220: 0011100,
LTC3220-1: 0011101)
n Automatic or Forced Mode Switching
n Internal Soft-Start Limits Inrush Current
n Short-Circuit/Thermal Protection
n 4mm × 4mm Ultrathin (0.55mm) 28-Lead QFN
Package
APPLICATIONS
n Video Phones with QVGA+ Displays
n Keypad Lighting
n General/Miscellaneous Lighting
DESCRIPTION
The LTC3220/LTC3220-1 are highly integrated multi-display
LED drivers. These parts contain a high efficiency, low noise
charge pump to provide power to up to eighteen universal
LED current sources. The LTC3220/LTC3220-1 require
only five small ceramic capacitors to form a complete
LED power supply and current controller.
The LED currents are set by an internal precision cur-
rent reference. Independent dimming, on/off, blinking
and gradation control for all universal current sources
is achieved via the I2C serial interface. 6-bit linear DACs
are available to adjust brightness levels independently for
each universal LED current source.
The LTC3220/LTC3220-1 charge pump optimizes efficiency
based on the voltage across the LED current sources. The
part powers up in 1x mode and will automatically switch
to boost mode whenever any enabled LED current source
begins to enter dropout. The first dropout switches the
parts into 1.5x mode and a subsequent dropout switches
the LTC3220/LTC3220-1 into 2x mode. The parts reset to
1x mode whenever a data bit is updated via the I2C port.
L, 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
C2
2.2μF
C3
2.2μF
6-LED Main, 4 RGB LEDs
VIN
DVCC
C1
2.2μF
C1P C1M C2P C2M
VIN CPO
LTC3220
LTC3220-1
DVCC
0.1μF
ULED1-18
I2C
RESET
SCL/SDA
RST
GND
C4
4.7μF
18
RGB1
RGB2
RGB3
RGB4
MAIN
3220 TA01
3220f
1


Linear Technology Electronic Components Datasheet

LTC3220 Datasheet

360mA Universal 18-Channel LED Driver

No Preview Available !

LTC3220 pdf
LTC3220/LTC3220-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 4)
VIN, DVCC, CPO to GND................................ –0.3V to 6V
ULED1-ULED18 to GND ............................... –0.3V to 6V
SDA, SCL, RST............................–0.3V to (DVCC + 0.3V)
ICPO (Continuous) (Note 2) ..................................360mA
IULED1-18 (Note 2) ..................................................25mA
CPO Short-Circuit Duration.............................. Indefinite
Operating Temperature Range (Note 3).... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
www.DataSheet4U.com
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23 22
ULED1 1
ULED2 2
ULED3 3
ULED4 4
ULED5 5
ULED6 6
ULED7 7
21 ULED18
20 ULED17
19 ULED16
29 18 ULED15
17 ULED14
16 ULED13
15 ULED12
8 9 10 11 12 13 14
PF PACKAGE
28-LEAD UTQFN (4mm s 4mm)
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3220EPF#PBF
LTC3220EPF#TRPBF
3220T
28-Lead UTQFN (4mm × 4mm)
LTC3220EPF-1#PBF
LTC3220EPF-1#TRPBF 2201T
28-Lead UTQFN (4mm × 4mm)
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: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, DVCC = 3V, RST = high, C1 = C2 = C3 = 2.2μF, C4 = 4.7μF,
unless otherwise noted.
SYMBOL
PARAMETER
VIN Operating Voltage
IVIN Operating Current
DVCC UVLO Threshold
DVCC Operating Voltage
VIN UVLO Threshold
VIN Shutdown Current
DVCC Shutdown Current
Universal LED Current, 6-Bit Linear DACs, ULED = 1V
Full-Scale LED Current
Minimum (ILSB) LED Current Step
CONDITIONS
ICPO = 0, 1x Mode
ICPO = 0, 1.5x Mode
ICPO = 0, 2x Mode
MIN
l 2.9
l 1.5
l
l
l 18
TYP
580
2.4
3.2
1
1.5
3.2
20
0.314
MAX UNITS
5.5 V
μA
mA
mA
V
5.5 V
V
7 μA
1 μA
22 mA
mA
3220f
2


Part Number LTC3220
Description 360mA Universal 18-Channel LED Driver
Maker Linear Technology Corporation
Total Page 20 Pages
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