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FEATURES

n

LT3599

4-Channel 120mA LED Driver

with ±1.5% Current Matching

DESCRIPTION

The LT

®

3599 is a ﬁxed frequency 2A step-up DC/DC

converter designed to drive four strings of 120mA LEDs

up to a 44V output voltage. The switching frequency

is programmable from 200kHz to 2.1MHz through an

external resistor.

LED dimming can be achieved with analog dimming on

the CTRL pin, and with pulse width modulation dimming

on the PWM pin. The LT3599 accurately regulates LED

current even when the input voltage is higher than the

LED output voltage.

Additional features include programmable LED current

derating, switching frequency synchronization to an ex-

ternal clock, LED string disable control,

OPENLED

alert

pin,

SHORTLED

alert pins and programmable maximum

output voltage when all LED strings are disconnected.

The LT3599 is available in the thermally enhanced 32-pin

(5mm

×

5mm) QFN and 28-pin TSSOP packages.

LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners. Protected by U.S. Patents, including 7199560.

True Color PWM

TM

Dimming Ratio Up to 3000:1

Drives Four Strings of LEDs at Up to 120mA

±1.5% Accurate LED Current Matching

Wide Input Voltage Range: 3.1V to 30V

Output Voltage Up to 44V

Regulates LED Current Even When V

IN

> V

OUT

Disconnects LEDs in Shutdown

Programmable Maximum V

OUT

(Regulated)

Open/Short LED Protection and Fault Flags

Programmable LED Current Derating

Adjustable Frequency: 200kHz to 2.1MHz

Synchronizable to an External Clock

Analog Dimming Up to 20:1

Programmable Input UVLO with Hysteresis

Thermally Enhanced 32-Pin (5mm

×

5mm) QFN and

28-Pin TSSOP Packages

APPLICATIONS

n

Automotive Navigation TFT LCD Displays

Desktop and Notebook TFT LCD Displays

TYPICAL APPLICATION

90% Efﬁcient 12W LED Driver

PV

IN

8V TO 24V

3.3μF

V

IN

V

IN

100k

200k

PWM

1μF

V

IN

3.1V TO 5.5V

V

IN

SW

V

OUT

V

O_SW

SHORTLED

OPENLED

SHDN/UVLO

PWM

SYNC

LT3599

CTRL

RT

V

REF

T

SET

80.6k

1M

FB

31.6k

10μH

220pF

4.7μF

2

LED Current Matching

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–50

ALL FOUR LED STRINGS

31.6k

33.2k

53.6k

52.3k

LED1

LED2

LED3

LED4

80mA PER STRING

GND V

C

47nF

2k

10nF

3599 TA01a

MATCHING (%)

DISABLE4

I

SET

SS

16.5k

–25

50

25

0

75

TEMPERATURE (°C)

100

125

3599 TA01b

100pF

3599f

1

LT3599

ABSOLUTE MAXIMUM RATINGS

(Note 1)

V

IN

,

SHDN/UVLO, OPENLED, SHORTLED

.................30V

SHDN/UVLO

Pin Above V

IN

.........................................3V

SW Voltage ...............................................................45V

V

OUT

, V

O_SW

Voltage .................................................45V

LED1, LED2, LED3, LED4 ..........................................45V

PWM, SYNC, CTRL, FB Voltage, T

SET

, DISABLE4 ........6V

V

C

, SS .........................................................................3V

V

REF

, R

T

, I

SET

..............................................................2V

Operating Junction Temperature Range ...–40°C to 125°C

Maximum Junction Temperature........................... 125°C

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

Lead Temperature (Soldering, sec) (Note 5) ......... 300°C

PIN CONFIGURATION

SW

V

OUT

V

O_SW

LED1

LED2

LED3

LED4

DISABLE4

SHORTLED

1

2

3

4

5

6

7

8

9

29

28 V

IN

VIN

SW

NC

27

SHDN/UVLO

26 NC

25 GND

24 V

REF

23 SS

22 R

T

21 PWM

20 NC

19 SYNC

18 NC

17 T

SET

16 FB

15 V

C

V

OUT

1

V

O_SW

2

LED1 3

LED2 4

LED3 5

LED4 6

DISABLE4 7

SHORTLED

8

9 10 11 12 13 14 15 16

NC

OPENLED

I

SET

CTRL

V

C

FB

T

SET

33

SHDN/UVLO

TOP VIEW

NC

32 31 30 29 28 27 26 25

24 NC

23 NC

22 GND

21 V

REF

20 SS

19 R

T

18 PWM

17 SYNC

NC 10

OPENLED

11

NC 12

I

SET

13

CTRL 14

FE PACKAGE

28-LEAD PLASTIC TSSOP

T

JMAX

= 125°C,

θ

JA

= 28°C/W

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

UH PACKAGE

32-LEAD (5mm 5mm) PLASTIC QFN

T

JMAX

= 125°C,

θ

JA

= 34°C/W

EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LT3599EFE#PBF

LT3599IFE#PBF

LT3599EUH#PBF

LT3599IUH#PBF

TAPE AND REEL

LT3599EFE#TRPBF

LT3599IFE#TRPBF

LT3599EUH#TRPBF

LT3599IUH#TRPBF

PART MARKING*

LT3599FE

3599

PACKAGE DESCRIPTION

28-Lead (4mm

×

4mm) Plastic FE

28-Lead (4mm

×

4mm) Plastic FE

32-Lead (5mm

×

5mm) Plastic QFN

32-Lead (5mm

×

5mm) Plastic QFN

TEMPERATURE RANGE

–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/

NC

3599f

2

LT3599

ELECTRICAL CHARACTERISTICS

PARAMETER

Minimum Operating Voltage

Maximum Operating Voltage

Reference Voltage V

REF

Reference Voltage Line Regulation

Maximum V

REF

Pin Current

V

REF

Load Regulation

Feedback Voltage

FB Pin Bias Current

FB Error Amp Transconductance

FB Error Amp Voltage Gain

Current Loop Amp Transconductance

Current Loop Amp Voltage Gain

V

C

Source Current (Out of Pin)

V

C

Sink Current (OVP Mode)

Quiescent Current

Quiescent Current in Shutdown

LED Current

LED String Current Matching

LED Open Detection Threshold (V

LED

–GND)

LED Short Detection Threshold (V

OUT

–V

LED

)

LED Regulation Voltage

LED1-4 Leakage Current

CTRL Pin Bias Current

Switching Frequency

V

LED1-4

= 45V

V

CTRL

= 0.8V (Note 3)

R

T

= 324k

R

T

= 53.6k

R

T

= 20k

R

T

= 324k

R

T

= 53.6k

R

T

= 20k

(Note 4)

I

SW

= 0.5A

V

SW

= 45V, FB = 1.3V

Shutdown

Rising

SHDN

= V

SD_UVLO

– 50mV

SHDN

= V

SD_UVLO

+ 50mV

SS = 1V (Note 3)

0.4

0.3

1.28

2.5

176

0.9

1.82

97

85

70

2

LED1-4 = 0.4V, FB = 1V, V

C

= 1.5V

LED1-4 = 0.4V, FB = 1.5V, V

C

= 1.5V

V

SHDN

= 5V, PWM = 0V, Not Switching, V

C

= 0.7V

V

SHDN

= 0V

R

ISET

= 13.3k

100mA LED Current

FB > 1.25V

0.8

l

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

IN

= 5V, V

SHDN

= 5V, unless otherwise noted. (Note 2)

CONDITIONS

l

MIN

TYP

2.7

MAX

3.1

30

1.24

1.25

0.03

100

UNITS

V

%/V

μA

mV

V

nA

μmhos

V/V

μmhos

V/V

μA

I(V

REF

) = 0μA

I(V

REF

) = 0μA, 3.1V < V

IN

< 30V, V

C

= 0.7V

(Note 3)

0 < I(V

REF

) ≤ 100μA (Max)

l

1.21

1.20

1.227

0.01

1

l

1.196

1.223

100

200

210

50

8

15

3

0

1.250

250

(Note 3)

ΔI

= 5μA

4.8

1

102

±1.5

0.4

2.2

1

200

220

1.1

2.3

mA

μA

mA

%

V

μA

nA

kHz

MHz

mV

%

96

99

±0.25

0.3

1.5

0.77

0.1

100

198

1

2.06

575

98

90

80

2.5

0.10

0.2

0.7

1.36

4

0

11

T

SET

Voltage

Maximum Switch Duty Cycle

l

Switch Current Limit

Switch V

CESAT

Switch Leakage Current

SHDN/UVLO

Pin Threshold (V

SD_SHDN

)

SHDN/UVLO

Pin Threshold (V

SD_ UVLO

)

SHDN/UVLO

Pin Hysteresis Current

Soft-Start Current

PWM Input High Threshold

PWM Input Low Threshold

3

5

0.95

1.44

5.5

A

V

μA

V

μA

V

3599f

1

3

LT3599

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

A

= 25°C. V

IN

= 5V, V

SHDN

= 5V, unless otherwise noted. (Note 2)

PARAMETER

PWM Pin Bias Current

SYNC Input High Threshold

SYNC Input Low Threshold

SYNC Pin Bias Current

V

O_SW

Switch Resistance

OPENLED

Pull-Down Current

SHORTLED

Pull-Down Current

DISABLE4 Input High Threshold

DISABLE4 Input Low Threshold

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:

The LT3599 is guaranteed to meet performance speciﬁcations

from 0°C to 125°C junction temperature. Speciﬁcations over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3599I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

0.4

PWM = 5V; LEDx < 0.2V,

OPENLED

= 0.3V

PWM = 5V; LEDx > (V

OUT

– 1.5V),

SHORTLED

= 0.3V

1

1.15

SYNC = 0V (Note 3)

SYNC = 3.3V

0.8

25

0.1

50

1

1000

CONDITIONS

PWM = 3.3V

MIN

TYP

0.1

MAX

2

1.7

UNITS

μA

V

μA

Ω

mA

V

ELECTRICAL CHARACTERISTICS

Note 3:

Current ﬂows out of pin.

Note 4:

Current limit guaranteed by design and/or correlation to static test.

Current limit is independent of duty cycle and is guaranteed by design.

Note 5:

TSSOP package only.

3599f

4

LT3599

TYPICAL PERFORMANCE CHARACTERISTICS

T

A

= 25°C unless otherwise speciﬁed

SHDN/UVLO

Pin Turn-On

Threshold (V

SD_UVLO

)

1.45

SHDN

/ UVLO PIN CURRENT (μA)

6

5

4

3

2

1

0

–50

AFTER PART TURN-OFF

0

25

50

75 100

–25

JUNCTION TEMPERATURE (°C)

125

0

–50

0

25

50

75 100

–25

JUNCTION TEMPERATURE (°C)

125

V

IN

CURRENT (nA)

JUST BEFORE PART TURN-ON

SHDN/UVLO

(Hysteresis) Current

500

450

V

IN

Current (Shutdown)

1.40

SHDN/

UVLO (V)

400

350

300

250

200

150

100

50

V

IN

= 3V

V

IN

= 30V

1.35

1.30

1.25

–50

0

25

50

75 100

–25

JUNCTION TEMPERATURE (°C)

125

3599 G01

3599 G02

3599 G03

V

REF

1250

SWITCHING FREQUENCY (MHz)

3.0

2.5

Switching Frequency

10000

Switching Frequency vs R

T

1240

V

REF

(mV)

V

IN

= 30V

2.1MHz

2.0

1.5

1MHz

1.0

0.5

0.2MHz

0

50

100

–50 –25

25

75

0

JUNCTION TEMPERATURE (°C)

1230

V

IN

= 3V

SWITCHING FREQUENCY (kHz)

125

1000

1220

1210

–50

0

25

50

75 100

–25

JUNCTION TEMPERATURE (°C)

125

100

10

100

RT (k)

1000

3599 G06

3599 G04

3599 G05

LED Current vs CTRL Pin

120

100

80

60

40

20

0

0.2

0.4

0.8

1.0

0.6

CTRL PIN VOLTAGE (V)

1.2

3599 G07

Soft-Start Pin Current

13

12

I

SS

(μA) (OUT OF PIN)

11

10

9

8

7

–50

I

SET

= 13.3k

LED CURRENT (mA)

0

25

50

75 100

–25

JUNCTION TEMPERATURE (°C)

125

3599 G08

3599f

5

LT3599IFE-PBF

LT3599IFE-PBF概述

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