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LTC3220/LTC3220-1

360mA Universal

18-Channel LED Driver

FEATURES

n

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 I

2

C 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 I

2

C 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.

n

Eighteen 20mA 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 I

2

C Interface

Low Noise Multi-Mode Charge Pump (1x, 1.5x, 2x)

Provides Up to 91% Efﬁciency

Slew Limited Switching Reduces Conducted and

Radiated Noise (EMI)

Up to 360mA Total Output Current

Internal Current Reference

Single Reset Pin for Asynchronous Shutdown and

Reset of All Data Registers

Two I

2

C Addresses Are Available (LTC3220: 0011100,

LTC3220-1: 0011101)

Automatic or Forced Mode Switching

Internal Soft-Start Limits Inrush Current

Short-Circuit/Thermal Protection

4mm

×

4mm Ultrathin (0.55mm) 28-Lead QFN

Package

APPLICATIONS

n

Video Phones with QVGA+ Displays

Keypad Lighting

General/Miscellaneous Lighting

TYPICAL APPLICATION

6-LED Main, 4 RGB LEDs

C2

2.2μF

C3

2.2μF

V

IN

C1P C1M C2P C2M

V

IN

CPO

C1

LTC3220

2.2μF

LTC3220-1

DV

CC

0.1μF

ULED1-18

RGB1

C4

4.7μF

18

RGB2

RGB3

RGB4

MAIN

DV

CC

3220 TA01

I

2

C

RESET

SCL/SDA

RST

GND

32201fc

1

LTC3220/LTC3220-1

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 4)

PIN CONFIGURATION

TOP VIEW

C1M

C2M

21 ULED18

20 ULED17

19 ULED16

29

18 ULED15

17 ULED14

16 ULED13

15 ULED12

8

ULED8

9 10 11 12 13 14

ULED9

DV

CC

SDA

SCL

ULED10

ULED11

CPO

RST

C1P

C2P

V

IN

V

IN

, DV

CC

, CPO to GND ................................ –0.3V to 6V

ULED1-ULED18 to GND ............................... –0.3V to 6V

SDA, SCL,

RST............................–0.3V

to (DV

CC

+ 0.3V)

I

CPO

(Continuous) (Note 2) ..................................360mA

I

ULED1-18

(Note 2) ..................................................25mA

CPO Short-Circuit Duration .............................. Indeﬁnite

Operating Temperature Range (Note 3)

LTC3220E/LTC3220E-1 ........................ –40°C to 85°C

LTC3220I/LTC3220I-1 ........................ –40°C to 125°C

Storage Temperature Range................... –65°C to 150°C

28 27 26 25 24 23 22

ULED1 1

ULED2 2

ULED3 3

ULED4 4

ULED5 5

ULED6 6

ULED7 7

PF PACKAGE

28-LEAD UTQFN (4mm

4mm)

T

JMAX

= 125°C,

θ

JA

= 37°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LTC3220EPF#PBF

LTC3220EPF-1#PBF

LTC3220IPF#PBF

LTC3220IPF-1#PBF

TAPE AND REEL

LTC3220EPF#TRPBF

LTC3220EPF-1#TRPBF

LTC3220IPF#TRPBF

LTC3220IPF-1#TRPBF

PART MARKING*

3220T

2201T

3220T

2201T

PACKAGE DESCRIPTION

28-Lead UTQFN (4mm

×

4mm)

28-Lead UTQFN (4mm

×

4mm)

28-Lead UTQFN (4mm

×

4mm)

28-Lead UTQFN (4mm

×

4mm)

TEMPERATURE RANGE

–40°C to 85°C

–40°C to 125°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based ﬁnish parts.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to:

http://www.linear.com/tapeandreel/

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

IN

= 3.6V, DV

CC

= 3V,

RST

= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF

,

unless otherwise noted.

SYMBOL

PARAMETER

V

IN

Operating Voltage

I

VIN

Operating Current

CONDITIONS

l

ELECTRICAL CHARACTERISTICS

MIN

2.9

TYP

580

2.4

3.2

1

MAX

5.5

I

CPO

= 0, 1x Mode

I

CPO

= 0, 1.5x Mode

I

CPO

= 0, 2x Mode

l

DV

CC

UVLO Threshold

DV

CC

Operating Voltage

V

IN

UVLO Threshold

1.5

5.5

UNITS

V

μA

mA

V

32201fc

2

LTC3220/LTC3220-1

The

l

denotes the speciﬁcations which apply over the full operating

,

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

IN

= 3.6V, DV

CC

= 3V,

RST

= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF

unless otherwise noted.

SYMBOL

PARAMETER

V

IN

Shutdown Current

DV

CC

Shutdown Current

Universal LED Current, 6-Bit Linear DACs, ULED = 1V

Full-Scale LED Current

Minimum (I

LSB

) LED Current Step

Minimum Programmable Current

LED Current Matching

LED Dropout Voltage

Blink Rate Period

ULED Up/Down Gradation Ramp Times

CONDITIONS

l

ELECTRICAL CHARACTERISTICS

MIN

TYP

3.2

MAX

7

1

22

UNITS

μA

mA

%

mV

Sec

mV

μs

Ω

V

MHz

V

mA

V

μA

V

ns

kHz

μs

18

Gradation Period

V

OL

General Purpose Output Mode (GPO)

LED Turn-On Delay

Charge Pump (CPO)

1x Mode Output Impedance

1.5x Mode Output Impedance

2x Mode Output Impedance

CPO Regulation Voltage

Clock Frequency

CPO Short-Circuit Detection

Threshold Voltage

Test Current

SDA, SCL,

RST

V

IL

V

IH

I

IH

I

IL

Digital Output Low (SDA)

V

OL

RST

Timing

Reset Pulse Duration

Serial Port Timing (Notes 6, 7)

Clock Operating Frequency

f

SCL

Bus Free Time Between Stop and Start

t

BUF

Condition

Hold Time After (Repeated) Start Condition

t

HD,STA

Repeated Start Condition Setup Time

t

SU,STA

Stop Condition Setup Time

t

SU,STO

ULED Data Register Programmed to

0b00000001

Any Two Outputs, 50% of FS

I

LED

= FS

REG19, D4 = 0

REG19, D4 = 1

REG19, D1 = 1, D2 = 0

REG19, D1 = 0, D2 = 1

REG19, D1 = 1, D2 = 1

REG19, D1 = 1, D2 = 0

REG19, D1 = 0, D2 = 1

REG19, D1 = 1, D2 = 1

I

OUT

= 1mA, Single Output Enabled

From Stop Bit, Part Enabled

20

0.314

0.395

1.5

120

1.25

2.5

0.24

0.48

0.96

0.313

0.625

1.25

5

4

0.6

3.6

4.1

4.5

5.03

0.85

0.410

0.820

1.640

V

IN

= 3V, V

CPO

= 4.2V (Note 5)

V

IN

= 3V, V

CPO

= 4.8V (Note 5)

1.5x Mode, I

CPO

= 20mA

2x Mode, I

CPO

= 20mA

l

0.65

0.4

10

1.05

1.3

30

0.3 • DV

CC

1

0.4

CPO = 0V

l

SDA, SCL,

RST

= DV

CC

SDA, SCL,

RST

= 0V

I

PULLUP

= 3mA

0.7 • DV

CC

l

–1

l

–1

l

0.12

20

400

1.3

0.6

32201fc

3

LTC3220/LTC3220-1

The

l

denotes the speciﬁcations which apply over the full operating

,

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

IN

= 3.6V, DV

CC

= 3V,

RST

= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF

unless otherwise noted.

SYMBOL

t

HD,DAT(OUT)

t

HD,DAT(IN)

t

SU,DAT

t

LOW

t

HIGH

t

f

t

r

t

SP

PARAMETER

Data Hold Time

Input Data Hold Time

Data Setup Time

Clock Low Period

Clock High Period

Clock Data Fall Time

Clock Data Rise Time

Spike Supression Time

CONDITIONS

MIN

0

100

1.3

0.6

20

TYP

MAX

900

UNITS

ns

μs

ns

ELECTRICAL CHARACTERISTICS

300

50

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

Based on long term current density limitations.

Note 3:

The LTC3220E/LTC3220E-1 are guaranteed to meet performance

speciﬁcations from 0°C to 85°C. Speciﬁcations over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3220I/LTC3220I-1

are guaranteed to meet performance speciﬁcations over the full –40°C to

125°C operating temperature range.

Note 4:

These devices include overtemperature protection that is intended

to protect the devices during momentary overload conditions. Junction

temperatures will exceed 125°C when overtemperature protection is

active. Continuous operation above the speciﬁed maximum operating

junction temperature may result in device degradation or failure.

Note 5:

1.5x mode output impedance is deﬁned as (1.5V

IN

– V

CPO

)/I

OUT

.

2x mode output impedance is deﬁned as (2V

IN

– V

CPO

)/I

OUT

.

Note 6:

All values are referenced to V

IH

and V

IL

levels.

Note 7:

Guaranteed by design.

TYPICAL PERFORMANCE CHARACTERISTICS

Mode Switch Dropout Times

2

T

A

= 25°C unless otherwise noted.

2x Mode CPO Ripple

1.5x Mode CPO Ripple

1.5

1

V

CPO

1V/DIV

V

CPO

20mV/DIV

AC COUPLED

V

CPO

20mV/DIV

AC COUPLED

V

IN

= 3.6V

250μs/DIV

3220 G01

V

IN

= 3.6V

I

CPO

= 200mA

C

CPO

= 4.7μF

500ns/DIV

3220 G02

V

IN

= 3.6V

I

CPO

= 200mA

C

CPO

= 4.7μF

500ns/DIV

3220 G03

32201fc

4

LTC3220/LTC3220-1

TYPICAL PERFORMANCE CHARACTERISTICS

1x Mode Switch Resistance

vs Temperature

0.80

0.75

SWITCH RESISTANCE (Ω)

0.70

0.65

0.60

0.55

0.50

0.45

0.40

0.35

0.30

–40 –25 –10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

3220 G04

T

A

= 25°C unless otherwise noted.

1.5x Mode Charge Pump Open-Loop

Output Resistance vs Temperature

4.5

OPEN-LOOP OUTPUT RESISTANCE (Ω)

4.3

4.1

CPO VOLTAGE (V)

3.9

3.5

3.3

3.1

2.9

2.7

2.5

–40 –25 –10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

3220 G05

1.5x Mode CPO Voltage vs I

CPO

4.8

4.6

3.6V

4.4

4.2

4.0

3.8

3.6

3.5V

V

IN

= 3.3V

V

IN

= 3.6V

V

IN

= 3.9V

3V

3.1V

3.2V

3.3V

3.4V

0

60

120

180

240

I

CPO

(mA)

300

360

3220 G06

2x Mode Charge Pump Open-Loop

Output Resistance vs Temperature

4.9

OPEN-LOOP OUTPUT RESISTANCE (Ω)

4.7

4.5

CPO VOLTAGE (V)

4.3

4.1

3.9

3.7

3.5

3.3

3.1

2.9

–40 –25 –10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

3220 G07

2x Mode CPO Voltage vs I

CPO

5.2

5.1

5.0

3.2V

3.1V

3V

FREQUENCY (kHz)

4.9

4.8

4.7

4.6

4.5

4.4

4.3

4.2

0

60

120

180

240

I

CPO

(mA)

300

360

790

780

770

760

3.3V-3.6V

810

800

Oscillator Frequency

vs V

IN

Voltage

T

A

= 25°C

T

A

= –45°C

T

A

= 85°C

750

740

730

2.9

3.55

T

A

= 125°C

4.2

V

IN

VOLTAGE (V)

4.85

5.5

3220 G09

3220 G08

V

IN

Shutdown Current

vs V

IN

Voltage

7.5

V

IN

SHUTDOWN CURRENT (μA)

6.5

T

A

= 85°C

5.5

T

A

= 25°C

4.5

T

A

= –40°C

3.5

2.5

1.5

2.9

3.55

4.2

VOLTAGE (V)

4.85

5.5

3220 G10

DV

CC

Current vs DV

CC

Voltage

3.0

RST

= SDA = DV

CC

610

605

V

IN

CURRENT (μA)

5.5

3220 G11

1x Mode No Load V

IN

Current

vs V

IN

Voltage

T

A

= 125°C

DV

CC

CURRENT (μA)

2.5

2.0

f

SCL

= 400kHz

1.5

f

SCL

= 100kHz

1.0

0.5

f

SCL

= 10kHz

0

1.5

2.5

3.5

4.5

DV

CC

VOLTAGE (V)

600

595

590

585

580

2.9

3.55

4.2

4.85

V

IN

VOLTAGE (V)

5.5

3220 G12

32201fc

5

LTC3220IPF-1-PBF

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