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PDF LTC3220-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3220-1 | |
| Descripción | 360mA Universal 18-Channel LED Driver | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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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
1 page  
LTC3220/LTC3220-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
4.3
4.1
3.9
3.7
www.DataSheet43U.5.com
3.3
3.1
2.9
–40
–15 10 35 60
TEMPERATURE (°C)
85
3220 G07
VIN Shutdown Current
vs VIN Voltage
7.5
6.5
TA = 85°C
TA = –40°C
5.5
TA = 25°C
4.5
3.5
2.5
1.5
2.9
3.55 4.2 4.85
VOLTAGE (V)
5.5
3220 G10
1.5x Mode VIN Current vs ICPO
(IVIN – 1.5ICPO)
16
14
12
10
8
6
4
2
0
0 60 120 180 240 300 360
ICPO (mA)
3220 G12
2x Mode CPO Voltage vs ICPO
5.2
5.1 3.3V-3.6V
5.0
4.9 3.2V
4.8 3.1V
3V
4.7
4.6
4.5
4.4
4.3
4.2
0
60 120 180 240 300 360
ICPO (mA)
3220 G08
DVCC Current vs DVCC Voltage
3.0 RST = SDA = DVCC
2.5
2.0
fSCL = 400kHz
1.5
fSCL = 100kHz
1.0
0.5
0
1.5
fSCL = 10kHz
2.5 3.5
4.5
DVCC VOLTAGE (V)
5.5
3220 G17
2x Mode VIN Current vs ICPO
(IVIN – 2ICPO)
14
12
10
8
6
4
2
0
0 60 120 180 240 300 360
ICPO (mA)
3220 G13
Oscillator Frequency
vs VIN Voltage
810
800
790
780
770
TA = –45°C
760
750 TA = 85°C TA = 25°C
740
730
2.9
3.55 4.2 4.85
VIN VOLTAGE (V)
5.5
3220 G09
1x Mode No Load VIN Current
vs VIN Voltage
610
605
600
595
590
585
580
2.9
3.55 4.2 4.85
VIN VOLTAGE (V)
5.5
3220 G11
ULED Pin Current
vs ULED Pin Voltage
25
20
15
10
5
0
0 0.05 0.1 0.15 0.2
ULED PIN VOLTAGE (V)
3220 G14
3220f
5
5 Page 
LTC3220/LTC3220-1
OPERATION
sub-address register is then written to, followed by the
data register. Each data register has a sub-address. After
the data register has been written a load pulse is created
after the stop bit. The load pulse transfers all of the data
held in the data registers to the DAC registers. The stop
bit can be delayed until all of the data master registers
have been written. At this point the LED current will be
changed to the new settings. The serial port uses static
www.DataShleoegt4icU.rceogmisters so there is no minimum speed at which it
can be operated.
I2C Interface
The LTC3220/LTC3220-1 communicate with a host (master)
using the standard I2C 2-wire interface. The Timing Diagram
(Figure 3) shows the timing relationship of the signals on
the bus. The two bus lines, SDA and SCL, must be high
when the bus is not in use. External pull-up resistors or
current sources, such as the LTC1694 SMBus accelerator,
are required on these lines.
The LTC3220/LTC3220-1 are receive-only (slave) devices.
There are two I2C addresses available. The LTC3220 I2C
address is 0011100 and the LTC3220-1 I2C address is
0011101. The I2C address is the only difference between
the LTC3220 and LTC3220-1.
Write Word Protocol Used By the LTC3220/LTC3220-1
1 7 11 8 1 8 1 1
S Slave Address Wr A *Sub-Address A Data Byte A P**
S = Start Condition, Wr = Write Bit = 0, A = Acknowledge,
P = Stop Condition
*The sub-address uses only the first 5 bits, D0, D1, D2, D3 and D4.
**Stop can be delayed until all of the data registers have been written.
LTC3220
00
ADDRESS
1110
WR
00
SUB-ADDRESS
S7 S6 S5 S4 S3 S2 S1 S0
DATA BYTE
76543210
LTC3220-1
00
ADDRESS
1110
WR
10
START
STOP
SDA 0 0 1 1 1 0 0 0 ACK S7 S6 S5 S4 S3 S2 S1 S0 ACK 7 6 5 4 3 2 1 0 ACK
SCL 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
Figure 2. Bit Assignments
3220 FO2
SDA
tLOW
tSU, DAT
SCL
tHD, STA
START
CONDITION
tHIGH
tr tf
tHD, DAT
tSU, STA
tHD, STA
REPEATED START
CONDITION
tSP
Figure 3. Timing Parameters
tBUF
tSU, STO
3220 F03
STOP
CONDITION
START
CONDITION
3220f
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC3220-1.PDF ] | |
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