LTC3220IPF-1(RevC) View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC3220IPF-1 Datasheet PDF : 20 Pages
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LTC3220/LTC3220-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
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 G13
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 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 VIN 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
VIN 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.
DVCC (Pin 10): Supply Voltage for All digital I/O lines. This
pin sets the logic reference level of the LTC3220/LTC3220-1.
DVCC 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 DVCC.
32201fc
6
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