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PDF LTC3219 Data sheet ( Hoja de datos )
| Número de pieza | LTC3219 | |
| Descripción | 250mA Universal Nine Channel LED Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3219www.DataSheet4U.com
250mA Universal
Nine Channel LED Driver
FEATURES
■ Multimode Charge Pump Provides Up to 91%
Efficiency
■ Slew Limited Switching Reduces Conducted and
Radiated Noise (EMI)
■ Up to 250mA Total Output Current
■ Nine 28mA Universal Current Sources with 64-Step
Linear Brightness Control
■ Independent On/Off, Brightness Level, Blinking and
Gradation Control for Each Current Source Using
2-Wire I2CTM Interface
■ Internal Current Reference
■ Configurable ENU Pin for Asynchronous LED On/Off
Control
■ Low Noise Charge Pump Operates in 1x, 1.5x or 2x
Mode for Optimal Efficiency*
■ Automatic or Forced Mode Switching
■ Internal Soft-Start Limits Inrush Current
■ Short-Circuit/Thermal Protection
■ 3mm × 3mm 20-Lead QFN Plastic Package
APPLICATIONS
■ Video Phones with QVGA+ Displays
DESCRIPTION
The LTC®3219 is a highly integrated multidisplay LED
driver. The device contains a high efficiency, low noise
charge pump to provide power to nine universal LED
current sources. The LTC3219 requires only five small
ceramic capacitors to form a complete LED power supply
and current controller.
The maximum display currents are set by an internal pre-
cision current reference. Independent dimming, On/Off,
blinking and gradation control for all current sources is
achieved via the I2C serial interface. 6-bit linear DACs are
available for adjusting brightness levels for each universal
LED current source.
The LTC3219 charge pump optimizes efficiency based on
the voltage across the LED current sources. The device
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
IC into 1.5x mode and a subsequent dropout switches
the LTC3219 into 2x mode. The part resets to 1x mode
whenever a data register is updated via the I2C port.
, 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
1μF
4-LED Main, 2-LED Sub and RGB
C3
1μF
VBAT
I2C
DVCC
ENABLE DISABLE
C1
2.2μF
2
C1P C1M C2P C2M
VBAT
CPO
LTC3219
SCL/SDA ULED1-9
9
DVCC
0.1μF
C4
2.2μF
ENU GND
MAIN
SUB
RGB
3219 TA01a
3219fa
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LTC3219www.DataSheet4U.com
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
VBAT Shutdown Current
vs VBAT Voltage
7.5
6.5
TA = –40°C
5.5
TA = 25°C
4.5
TA = 85°C
3.5
2.5
1.5
2.9 3.3 3.7 4.1 4.5 4.9 5.3
VBAT VOLTAGE (V)
3219 G10
1x Mode No Load VBAT Current vs
425 VBAT Voltage
420
415
410
405
400
395
390
385
380
375
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
VBAT VOLTAGE (V)
3219 G11
1.5x Mode VBAT Current vs ICPO
10 (IVBAT – 1.5ICPO)
8
6
4
2
0
0 50 100 150 200 250 300
ICPO (mA)
3219 G12
ULED Pin Current vs Input Code
30
25
20
15
10
5
0
1 0A 13 1C 25 2E 37 3F
INPUT CODE (HEX)
3219 G15
2x Mode VBAT Current vs ICPO
(IVBAT – 2ICPO)
10
VBAT = 3.6V
8
6
4
2
0
0 50 100 150 200 250 300
ICPO (mA)
3219 G13
ULED Pin Dropout Voltage
vs ULED Pin Current
20O
VBAT = 3.6V
160
120
80
40
0
0 4 8 12 16 20 24 28
ULED PIN CURRENT (mA)
3219 G16
ULED Pin Current
vs ULED Pin Voltage
35 VBAT = 3.6V
30
25
20
15
10
5
0
0 0.06 0.12 0.18 0.24 0.30
ULED PIN VOLTAGE (V)
3219 G14
9-LED ULED Display Efficiency vs
VBAT Voltage
100
90
80
70
60
50
40
30
9 LEDs AT 15mA/LED
20 (TYP VF AT 15mA = 3.2V
10 NICHIA NSCW100)
TA = 25°C
0
3.0 3.5 4.0 4.5
VBAT VOLTAGE (V)
5.0 5.5
3219 G17
3219fa
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LTC3219www.DataSheet4U.com
OPERATION
I2C Interface
The LTC3219 communicates with a host (master) using
the standard I2C 2-wire interface. The Timing Diagram
(Figure 2) 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 LTC3219 is a receive-only (slave) device.
Write Word Protocol Used by the LTC3219
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 four bits, D0, D1, D2 and D3
**Stop can be delayed until all of the data registers have been written
ADDRESS
WR
00 110110
SUB-ADDRESS
S7 S6 S5 S4 S3 S2 S1 S0
DATA BYTE
76543210
START
SDA 0 0 1 1 0 1 1 0 ACK S7 S6 S5 S4 S3 S2 S1 S0 ACK 7 6 5 4 3 2 1 0 ACK
STOP
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
3219 FO2
Figure 2. Bit Assignments
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
3219 F03
STOP
CONDITION
START
CONDITION
3219fa
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC3219.PDF ] | |
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