LTC3220IPF-1-PBF datasheet(6/20 Pages) LINER

Part #	LTC3220IPF-1-PBF

Description	360mA Universal 18-Channel LED Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3220/LTC3220-1

6

32201fb

PIN FUNCTIONS

TYPICAL PERFORMANCE CHARACTERISTICS T

A = 25°C unless otherwise noted.

18-LED ULED Display Efﬁciency

vs VIN Voltage

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.

ULED Current vs Input Code

INPUT CODE (HEX)

009

0

10

25

12

24

2D

3220 G16

5

20

15

1B

36

3F

VIN VOLTAGE (V)

2.9

100

10

90

70

50

30

80

60

40

20

0

4.525

3.875

5.175

3220 G17

5.5

4.2

3.55

4.85

3.225

1.5x Mode VIN Current vs ICPO

(IVIN – 1.5ICPO)

2x Mode VIN Current vs ICPO

(IVIN – 2ICPO)

ULED Pin Current

vs ULED Pin Voltage

ICPO (mA)

0

6

8

10

180

300

3220 G13

4

2

0

60

120

240

12

14

16

360

ICPO (mA)

0

14

12

10

8

6

4

2

0

180

300

3220 G14

60

120

240

360

ULED PIN VOLTAGE (V)

0

10

15

0.2

3220 G15

5

0

0.05

0.1

0.15

25

20

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LTC3220IPF-1-PBF Datasheet(PDF) 6 Page - Linear Technology

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