LTC3220_15 Datasheet, PDF (6/20 Pages) Linear Technology – 360mA Universal 18-Channel LED Driver

LTC3220/LTC3220-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted.
1.5x Mode V_IN Current vs I_CPO
(I_VIN – 1.5I_CPO)
16
14
12
10
8
6
4
2
0
0 60 120 180 240 300 360
I_CPO (mA)
3220 G13
2x Mode V_IN Current vs I_CPO
(I_VIN – 2I_CPO)
14
12
10
8
6
4
2
0
0 60 120 180 240 300 360
I_CPO (mA)
3220 G14
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 G15
ULED Current vs Input Code
25
20
15
10
5
0
0 09 12 1B 24 2D 36 3F
INPUT CODE (HEX)
3220 G16
18-LED ULED Display Efficiency
vs V_IN Voltage
100
90
80
70
60
50
40
30
20
10
0
2.9 3.225 3.55 3.875 4.2 4.525 4.85 5.175 5.5
V_IN VOLTAGE (V)
3220 G17
PIN FUNCTIONS
ULED1-ULED18 (Pins 1-9,13-21): Current Source Outputs
for Driving LEDs. The LED current can be set from 0mA
to 20mA in 64 steps via software control and internal
6-bit linear DAC. Each output can be disabled by setting
the associated data register REG1 to REG18 low. ULED1
to ULED18 can also be used as I²C controlled open-drain
general purpose outputs. Connect unused outputs to
ground.
DV_CC (Pin 10): Supply Voltage for All digital I/O lines. This
pin sets the logic reference level of the LTC3220/LTC3220-1.
DV_CC will reset the data registers when set below the
undervoltage lockout threshold. A 0.1μF X5R or X7R
ceramic capacitor should be connected to ground.
SCL (Pin 11): I²C Clock Input. The logic level for SCL is
referenced to DV_CC.
32201fc
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