LT3595_技术文档

LT3595

16 Channel

Buck Mode LED Driver

FEATURES

DESCRIPTION

The LT^®3595 is a high performance LED Driver designed

to drive sixteen independent channels of up to 10 LEDs

at currents up to 50mA. Series connection of the LEDs

providesidenticalLEDcurrentsresultinginuniformbright-

ness.Powerswitches,Schottkydiodes,andcompensation

components are all internal, providing a small converter

footprint and lower component cost. The high 2MHz

switching frequency permits the use of tiny, low proﬁle

inductors and capacitors. A ﬁxed frequency, current mode

architecture results in stable operation over a wide range

of supply and output voltage.

■

4.5V to 45V Input Supply Range

■

Up to 50mA LED Current per Channel

■

100mA, 45V Internal Switches

■

8% Relative LED Current Match at 20mA

■

16 Independent LED Channels

5000:1 True Color PWM^TMDimming Range

■

LEDs Disconnected in Shutdown

■

Internal Schottky Diodes

■

Low Quiescent Current

■

2MHz Switching Frequency

■

R

Pin Sets Master LED Current

SET

■

Typical Efﬁciency: 92%

AsingleexternalresistorsetstheLEDcurrentforallsixteen

channels,anddimmingisthencontrolledforeachchannel

by pulse width modulating the individual PWM pins. Rela-

tivecurrentmatchingamongthesixteendriversis8%and

the PWM dimming range is 5000:1. The part is available

in a 5mm × 9mm × 0.75mm 56-pin QFN package.

Open LED Detection and Thermal Protection

56-Pin 5mm × 9mm × 0.75mm QFN Package

APPLICATIONS

■

LED Video Billboards

, 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.

■

LCD Televisions

■

Stadium and Advertising Displays

TYPICAL APPLICATION

16-Channel LED Driver (Three LEDs per Channel), 20mA Current

5000:1 PWM

Dimming at 100Hz

V

IN

15V TO

0.47μF

0.47μF 0.47μF

0.47μF

45V

10μF

V

PWM

5V/DIV

V

CC

I

SW

20mA/DIV

100k

L1 SW1

OPENLED

PWM1

PWM2

PWM3

PWM4

PWM5

PWM6

PWM7

PWM8

SHDN

L2

SW2

SW3

L3

SW4

L4

L5

SW5 L6 SW6

SW7 L7

SW8 L8

PWM9

PWM10

PWM11

PWM12

PWM13

PWM14

PWM15

PWM16

GND

I

LED

10mA/DIV

LED

BRIGHTNESS

CONTROL

BRIGHT-

NESS

LT3595

3595 TA01b

400ns/DIV

CONTROL

V

= 15V

T = 10ms

= 2μs

IN

3 LEDS AT 20mA

T

ON

V

CC

V

R

SET

3V TO

5.5V

CC

L16 SW16 L15 SW15

V

SW14 L14 SW13 L13

L12 SW12 L11 SW11 V SW10 L10 SW9 L9

IN

10μF

0.47μF

0.47μF 0.47μF

0.47μF

3595 TA01

3595f

1

LT3595

ABSOLUTE MAXIMUM RATINGS

PIN CONFIGURATION

(Note 1)

TOP VIEW

Input Voltage (V )....................................................45V

IN

L1-16 Voltage ...........................................................45V

Supply Voltage (V ) ..................................................6V

CC

56 55 54 53 52 51 50 49 48 47

R

SET

, OPENLED , PWM1-16, SHDN Voltage ...............6V

Operating Junction Temperature Range

L16

SW16

L15

1

2

3

4

5

6

7

8

9

46 L1

45 SW1

L2

44

43

(Note 2) ...............................................–40°C to 85°C

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

Storage Temperature Range...................–65°C to 125°C

SW15

SW2

V

42 NC

IN

SW14

L14

SW3

41

40 L3

39 SW4

38 L4

37 L5

36 SW5

35 L6

34 SW6

33 NC

32 SW7

31 L7

30 SW8

29 L8

SW13

L13

57

L12 10

SW12 11

L11 12

SW11 13

V

14

IN

SW10 15

L10 16

SW9 17

L9 18

19 20 21 22 23 24 25 26 27 28

UHH PACKAGE

56-LEAD (5mm × 9mm) PLASTIC QFN

T

= 125°C, θ = 31°C/W, θ = 0.5°C/W

JA JC

JMAX

EXPOSED PAD (PIN 57) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

56-Lead (5mm × 9mm) Plastic QFN

TEMPERATURE RANGE

–40°C to 85°C

LT3595EUHH#PBF

LT3595EUHH#TRPBF

3595

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges.

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/

3595f

2

LT3595

ELECTRICAL CHARACTERISTICS ^The● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_A= 25°C, V_IN= 45V, V_CC= 3.3V, PWM = SHDN = OPENLED = 3.3V, R_SET= 75kΩ,

GND = 0V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

4.5

3

TYP

MAX

UNITS

V

Operating Voltage

IN

Operating Voltage

5.5

2.9

V

CC

Input Under Voltage Lockout

Quiescent Current ON, No Switching

Quiescent Current in Shutdown

2.6

0.25

15

V

CC

I

V

= 45V

mA

μA

mA

μA

mA

MHz

%

VIN

VCC

L1-16

IN

= 45V, SHDN = 0V

= 3.3V

40

IN

Quiescent Current ON, No Switching

Quiescent Current in Shutdown

17

CC

= 3.3V, SHDN = 0V

3

10

21.6

2.4

Output Current Accuracy

R

= 75.0kΩ

18.4

1.6

78

20

SET

Switching Frequency

Maximum Duty Cycle

Switch Current Limit

2

●

83

90

120

450

0.1

0.8

0.1

150

6

mA

mV

μA

V

Switch V

ISW1-16 = 50mA

VSW1-16 = 45V

CESAT

Switch Leakage Current

Schottky Forward Drop

I

= 50mA

SCHOTTKY

Schottky Leakage Current

SHDN, PWM1-16 Input Low Voltage

SHDN, PWM1-16 Input High Voltage

SHDN Pin Bias Current

V

= 45V, V

= 0.7V, SHDN = 0V

SW1-16

4

μA

V

IN

0.4

1.6

V

SHDN = 3.3V

35

0.1

μA

V

PWM1-16 Pin Bias Current

OPENLED Pin Voltage

PWM1-16 = 3.3V

1

V

= 3.3V, I

= 200μA

OPENLED

0.12

0.1

CC

OPENLED Pin Input Leakage Current

OPENLED = 3.3V

μA

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 LT3595 is guaranteed to meet performance speciﬁcations

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

to 85°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls.

3595f

3

LT3595

TYPICAL PERFORMANCE CHARACTERISTICS

PWM Dimming Waveforms

(1000:1)

PWM Dimming Waveforms

(10:1)

Switching Waveforms

10 LEDS

V

SW1

PWM

50V/DIV

5V/DIV

10 LEDS

I

L1

50mA/DIV

I

L

5 LEDS

20mA/DIV

V

SW2

50V/DIV

I

LED

5 LEDS

20mA/DIV

I

L2

3595 G03

3595 G01

3595 G02

50mA/DIV

2ms/DIV

400ns/DIV

2μs/DIV

PWM FREQUENCY = 100Hz

= 10μs

V

I

= 45V

LED

V

= 40V

PWM FREQUENCY = 100Hz

10 LEDS AT 20mA T = 1ms

ON

V

= 40V

IN

= 20mA

10 LEDS AT 20mA

T

ON

LED Current vs PWM Duty Cycle

Wide Dimming Range (5000:1)

V_INQuiescent Current

LED Current vs R_SETResistance

100

10

2.0

1.6

1.2

0.8

0.4

0

60

50

40

30

20

10

0

V

= 45V

IN

10 LEDS AT 20mA

T = 125°C

PWM FREQUENCY = 100Hz

T = 25°C

T = –40°C

1

0.1

0.01

0.001

0.01

0.1

1

10

100

0

10

20

30

(V)

40

50

25

50

75

100

125

150

DUTY CYCLE (%)

V

IN

R

RESISTANCE (kΩ)

SET

3595 G04

3595 G06

3595 G05

V_CCQuiescent Current

SHDN Pin Bias Current

20

18

16

14

12

10

8

100

80

V

= 3.3V

T = 125°C

CC

T = 25°C

T = –40°C

T = 25°C

60

T = –40°C

T = 125°C

40

6

4

20

0

2

0

2

3

4

5

6

7

1

0

2

3

4

5

6

1

V

(V)

CC

V

(V)

SHDN

3595 F07

3595 F08

3595f

4

LT3595

TYPICAL PERFORMANCE CHARACTERISTICS

Switching Frequency

Schottky Leakage Current

vs Temperature

Current Limit vs Temperature

150

140

130

120

110

100

90

2.4

2.3

2.2

2.1

2.0

1.9

1.8

1.7

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

V

= 45V

IN

V

= 24V

IN

= 4.5V

IN

0

50

TEMPERATURE (°C)

100 125

50

100 125

–50 –25

0

25

75

–50 –25

0

25

75

50

100 125

–50 –25

0

25

75

TEMPERATURE (°C)

3595 G09

3595 G10

3595 G11

Switch Saturation Voltage

(V_CESAT

Schottky Forward Voltage Drop

)

100

80

60

40

20

0

700

600

500

400

300

200

100

0

T = –40°C

T = 125°C

T = 25°C

T = 125°C

T = 25°C

T = –40°C

20

40

60

100

0.2

0.6

0

80

0

0.4

0.8

1

SWITCH CURRENT (mA)

SCHOTTKY FORWARD DROP (V)

3595 G13

OPENLED Waveforms

Transient Response

I

LED

V

SHDN

CH 1

5V/DIV

20mA/DIV

V

OPENLED

5V/DIV

SW

50V/DIV

V

SW

CH 1

I

SW

50V/DIV

50mA/DIV

I

LED

CH 2

I

LED

20mA/DIV

3595 G14

3595 G15

100μs/DIV

20μs/DIV

V

= 45V

IN

V

= 45V

IN

10 LEDS AT 20mA

3595f

5

LT3595

PIN FUNCTIONS

L1-16 (Pins 1, 3, 7, 9, 10, 12, 16, 18, 29, 31, 35, 37,

38, 40, 44, 46): LED Pins. Connection point for the anode

of the highest LED in each string.

SHDN (Pin 24): Shutdown. Tie to 1.6V or greater to enable

the device. Tie below 0.4V to turn off the device.

NC (Pins 33, 42): No Connect. Connect these pins to

ground.

SW1-16 (Pins 2, 4, 6, 8, 11, 13, 15, 17, 30, 32, 34,

36, 39, 41, 43, 45): Switch Pins. Minimize trace area

at these pins to minimize EMI. Connect the inductors to

these pins.

R

(Pin 51): External Resistor to Set the Master LED

SET

Current. The LED current is equal to:

1.21V

R_SET

V

(Pins 5, 14): 4.5V to 45V Input Supply Pin.

I_LED

=

• 1240

IN

Must be locally bypassed. Both V pins must be tied

IN

together.

where R

is the value of the external resistor. Use a

SET

kelvin for ground metal.

PWM1-16 (Pins 19-22, 25-28, 47-50, 53-56): Input Pin

forLEDDimmingFunction.Therisingedgeofeachchannel

must be synchronized.

V

(Pin 52): 3.3V Input Supply. Must be locally by-

CC

passed.

OPENLED (Pin 23): Open Collector Output for Reporting

Faults. If any channel experiences an open LED connec-

tion, the OPENLED pin is pulled low.

Exposed Pad (Pin 57): Ground. The Exposed Pad must

be soldered to PCB. Use wide metal from backtab to the

grounds of the input capacitors on V and V .

CC

IN

3595f

6

LT3595

BLOCK DIAGRAM

C

IN

V

IN

10μF

V

PWM1-16

IN

V

CC

VREG

V

52

L1-16

V

C1

10μF

DFC

CONTROL

CC

REG

3.3V

1 CHANNEL

16X

C

OUT1-16

0.47μF

SHDN

SW1-16

24

51

REF

R

V/I

SET

–

PWM

+

R

Q

S

L

R

SET

1-16

100μH

+

–

ISNS

Σ

GND

57

23

RAMP

GENERATOR

OPENLED

2MHz

OSCILLATOR

CONTROL

3595 BD

3595f

7

LT3595

OPERATION

The LT3595 uses a constant-frequency, current mode

control scheme to provide excellent line and load regula-

tion.OperationisbestunderstoodbyreferringtotheBlock

Diagram.Theoscillator,V-Iconverterandinternalregulator

are shared by the sixteen converters. The control circuitry,

power switches, PWM comparators and dimming control

(DFC) are identical for all converters.

Input Voltage Range

Theminimuminputvoltagerequiredtogenerateaspeciﬁc

output voltage in an LT3595 application is limited by its

4.5V input voltage or by its maximum duty cycle. The duty

cycle is the fraction of time that the internal switch is on

divided by the total period. It is determined by the input

voltage and the voltage across the LEDs:

The LT3595 enters shutdown mode when the SHDN pin

is lower than 400mV. If the SHDN pin is above 1.6V,

then the LT3595 turns on. At the start of each oscillator

cycle, the power switch is turned on. Current ramps up

through the output capacitor, the inductor, and the switch

to ground. When the voltage across the output capacitor

is larger than the LEDs’ forward voltage, current ﬂows

through the LEDs.

V_LED+ V_D

DC =

V_VIN− V_CESAT+ V_D

where V

is the voltage drop across the LEDs, V is

D

LED

the Schottky forward drop, and V

is the saturation

CESAT

voltage of the internal switch. This leads to a minimum

input voltage of:

V_LED+ V_D

V

=

+ V_CESAT− V_D

Whentheswitchison, avoltageproportionaltotheswitch

current is added to a stabilizing ramp and the resulting

sum is fed into the positive terminal of the PWM compara-

tor. When this voltage exceeds the level at the negative

input of the PWM comparator, the PWM logic turns off

the power switch. The level at the negative input of the

PWM comparator is set by the error ampliﬁer output. This

voltage is set by the LED current and the bandgap refer-

ence. In this manner, the error ampliﬁer sets the correct

peak current level in the inductor to keep the LED output

IN(MIN)

DC_MAX

is the minimum rating of maximum duty

where DC

cycle.

MAX

The maximum input voltage is limited by the absolute

maximum rating of 45V.

Pulse-Skipping

At low duty cycles, the LT3595 may enter pulse-skipping

mode. Low duty cycle occurs at higher input voltages and

lower LED count. The LT3595 can drive currents without

pulse-skipping provided the voltage across the LED

string is greater than 15% of the input supply voltage. If

the current decreases to the point that the LED voltage is

less than 15% of the input supply, the device may begin

skipping pulses. This will result in some low frequency

ripple, although the LED current remains regulated on an

average basis down to 10mA.

current in regulation. The external R

resistor is used

SET

to program the LED current from 10mA to 50mA.

3595f

8

LT3595

OPERATION

Discontinuous Current Mode

V

SW

The LT3595 can drive a 10-LED string at 15mA LED cur-

rent operating in continuous conduction mode using the

recommended external components shown in the ap-

plication circuit on page 1 of this data sheet. As current

is further reduced, the regulator enters discontinuous

conduction mode. The photo in Figure 1 details circuit

operation driving ten LEDs at 10mA load. The inductor

current reaches zero during the discharge phase and the

SW pin exhibits ringing. The ringing is due to the LC tank

circuit formed by the inductor in combination with the

switch and diode capacitance. This ringing is not harmful;

far less spectral energy is contained in the ringing than in

the switch transitions.

20V/DIV

I

L

20mA/DIV

3595 F01

400ns/DIV

10 LEDS AT 10mA

V

= 45V

IN

Figure 1. Switching Waveforms

TYPICAL APPLICATIONS

Table 1. Inductor Manufacturers

PART

Inductor Selection

INDUCTANCE

RANGE (μH)

RELEVANT TO

LT3595

A 100μH inductor is recommended for most LT3595

applications. Although small size and high efﬁciency are

major concerns, the inductor should have low core losses

at 2MHz and low DCR (copper wire resistance). Some

inductors that meet these criteria are listed in Table 1. An

efﬁciency comparison of different inductors is shown in

Figure 2.

DIMENSIONS

(mm)

VENDOR

SERIES

Coilcraft

www.coilcraft.com

DO1605

LPS4012

1812FS

100 to 680

100 to 390

5.4 × 4.2 × 1.8

4 × 4 × 1.2

5.8 × 4.9 × 3.8

5.1 × 5.1 × 3.1

MSS5131

Sumida

www.sumida.com

CDC4D20

100 to 680

100 to 330

4.8 × 4.8 × 2

5.2 × 5.4 × 3

4 × 4 × 2

100

Toko

D53LC

COILCRAFT 1812FS-104KLB

COILCRAFT LPS4012-104MLB

TOKO A915AY-101M

TDK VLCF4020T-101MR26

COILTRONICS SD3812-101

COILTRONICS SD52-101

www.tokoam.com

TDK

VLCF4020T

www.component.

tdk.com

95

Coiltronics

www.cooperet.com

SD3812

SD52

100 to 330

4 × 4 × 1.2

5.6 × 5.2 × 2

Murata

www.murata.com

LQH32M

LQH43M

100 to 560

100 to 680

3.2 × 2.5 × 2

4.5 × 3.2 × 2

90

Capacitor Selection

85

0.01

0.1

1

10

100

The small size of ceramic capacitors make them ideal for

LT3595 applications. Only X5R and X7R types should be

used because they retain their capacitance over wider

voltage and temperature ranges than other types such

I

(mA)

LED

3595 F02

V

= 45V L = 100μH

IN

10 LEDS

Figure 2. Efﬁciency Comparison of Different Inductors

as Y5V or Z5U. Typically, 10μF capacitors on V and

IN

V

CC

are sufﬁcient. The output capacitor used across the

3595f

9

LT3595

APPLICATIONS INFORMATION

LED string depends on the number of LEDs and can vary

from 0.47μF to 1μF. Refer to Table 2 for proper output

capacitor selection.

Open LED Detection

The LT3595 detects an open LED on any channel and

reports it to the OPENLED pin. The fault also reports dur-

ing startup until the output voltage and LED current are

in regulation. Therefore, it can also be used as a “power

ok” signal.

Table 2. Recommended Output Capacitor Values (V_LED= 3.5V)

# LEDs

3-10

1-2

C

(μF)

OUT

0.47

1

Programming LED Current

The set resistor (R

in the Block Diagram) controls

Table 3. Recommended Ceramic Capacitor Manufacturers

SET

the LED current in all sixteen channels. LED current as

a function of the R resistance is shown in the Typical

PerformanceCharacteristics.CommonvaluesforLEDcur-

rent and their required resistor values are listed in Table 4.

SinceresistorerrordirectlytranslatestoLEDcurrenterror,

precision resistors are preferred (1% is recommended).

The maximum allowed resistor value is 150k.

Taiyo Yuden

(408) 573-4150

www.t-yuden.com

SET

TDK

(847) 803-6100

www.component.tdk.com

Murata

Kemet

(714) 852-2001

www.murata.com

(408)-986-0424

www.kemet.com

Table 4. LED Current vs R_SETResistance

Table 3 shows a list of several ceramic capacitor manufac-

turers. Consultthemanufacturersfordetailedinformation

on their entire selection of ceramic parts.

R

SET

(kΩ)

I

(mA)

LED

150

10

75.0

49.9

37.4

30.1

20

30

40

50

3595f

10

LT3595

APPLICATIONS INFORMATION

Dimming Control

of a channel is 2μs and the maximum period is 10ms (at

100Hz).Therefore,themaximumdimmingratiois5000:1.

The sixteen PWM1-16 inputs control the dimming func-

tion. Each channel is modulated by its corresponding

PWM1-16 input. On a rising edge of any PWM1-16, the

IC’s internal support circuitry is enabled and the speciﬁc

channel turns on. LED current ﬂows in the channel until

the falling edge of the PWM1-16 input. In this way, the

average LED current is modulated. The minimum on time

Since the maximum R produces 10mA, the minimum

SET

modulated LED current is 2μA.

When multiple channels are modulated, the rising edges

ofPWM1-16mustbesynchronized.Thefallingedgesmay

be asynchronous. A sample timing diagram is shown in

Figure 3.

SYNCHRONIZED RISING EDGES

PWM1-4

t

= 2μs

ON(MIN)

PWM5-8

t

= 10ms

MAX

PWM9-16

I

LED1-4

LED5-8

I

3595 F03

I

LED9-16

Figure 3. Timing Diagram for Multi-Channel Modulation

3595f

11

LT3595

APPLICATIONS INFORMATION

Board Layout Considerations

the SW1-16 and PWM1-16 pins. Keep the sense voltage

pins (V and L1-16) away from the switching nodes.

IN

As with all switching regulators, careful attention must be

paid to the PCB board layout and component placement.

To prevent electromagnetic interference (EMI) problems,

properlayoutofhighfrequencyswitchingpathsisessential.

Minimize the length and area of all traces connected to

Place C

and C close to the V pins. Always use

OUT1-16

IN IN

a ground plane under the switching regulator to minimize

interplanecoupling.Recommendedcomponentplacement

is shown in Figures 4-7.

Figure 4. PCB Layer 1

Figure 5. PCB Layer 2

3595f

12

LT3595

APPLICATIONS INFORMATION

Figure 6. PCB Layer 3

Figure 7. PCB Layer 4

3595f

13

LT3595

TYPICAL APPLICATIONS

30W LED Driver for 160 LEDs (16 Strings, 10 LEDs per String) at 50mA

V

IN

45V

0.47μF

10μF

V

CC

100k

L1 SW1

OPENLED

PWM1

L2

SW2

SW3

L3

SW4

L4

L5

SW5 L6 SW6

SW7 L7

SW8 L8

PWM9

PWM10

PWM11

PWM12

PWM13

PWM14

PWM15

PWM16

GND

PWM2

PWM3

LED

BRIGHTNESS

CONTROL

LED

BRIGHTNESS

CONTROL

PWM4

PWM5

LT3595

PWM6

PWM7

PWM8

SHDN

3V TO

5.5V

V

R

CC

SET

L12 SW12 L11 SW11 V SW10 L10 SW9 L9

L16 SW16 L15 SW15

V

SW14 L14 SW13 L13

IN

10μF

0.47μF

3595 TA02

Conversion Efﬁciency

5000:1 PWM Dimming at 100Hz

100

V

PWM

5V/DIV

95

90

85

I

SW

50mA/DIV

I

LED

20mA/DIV

3595 TA02c

400ns/DIV

10 LEDS AT 40mA

10

20

30

(mA)

40

50

I

LED

3595 TA02b

3595f

14

LT3595

PACKAGE DESCRIPTION

UHH Package

56-Lead Plastic QFN (5mm × 9mm)

(Reference LTC DWG # 05-08-1727 Rev A)

0.70 0.05

5.50 0.05

(2 SIDES)

4.10 0.05

(2 SIDES)

3.60 REF

(2 SIDES)

3.45 0.05

7.13 0.05

PACKAGE

OUTLINE

0.20 0.05

0.40 BSC

6.80 REF (2 SIDES)

8.10 0.05 (2 SIDES)

9.50 0.05 (2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED

PIN 1 NOTCH

R = 0.30 TYP OR

0.35 × 45° CHAMFER

0.75 0.05

0.00 – 0.05

5.00 0.10

(2 SIDES)

3.60 REF

55 56

0.40 0.10

PIN 1

TOP MARK

(SEE NOTE 6)

1

2

9.00 0.10

(2 SIDES)

6.80 REF

7.13 0.10

3.45 0.10

(UH) QFN 0406 REV A

0.200 REF

0.20 0.05

0.40 BSC

BOTTOM VIEW—EXPOSED PAD

R = 0.115

TYP

0.200 REF

0.00 – 0.05

0.75 0.05

NOTE:

1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE

2. DRAWING NOT TO SCALE

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

3. ALL DIMENSIONS ARE IN MILLIMETERS

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION

ON THE TOP AND BOTTOM OF PACKAGE

3595f

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

15

LT3595

TYPICAL APPLICATIONS

16-Channel LED Driver (Three LEDs per Channel), 20mA Current

5000:1 PWM Dimming at 100Hz

V

IN

15V TO

45V

0.47μF

V

PWM

5V/DIV

10μF

I

V

CC

SW

20mA/DIV

100k

L1 SW1

OPENLED

PWM1

L2

SW2

SW3

L3

SW4

L4

L5

SW5 L6 SW6

SW7 L7

SW8 L8

I

LED

10mA/DIV

PWM9

PWM10

PWM11

PWM12

PWM13

PWM14

PWM15

PWM16

GND

PWM2

LED

PWM3

3595 TA03b

LED

BRIGHTNESS

CONTROL

400ns/DIV

T = 10ms

BRIGHT-

NESS

PWM4

PWM5

LT3595

V

= 15V

IN

3 LEDS AT 20mA

CONTROL

PWM6

T

= 2μs

ON

PWM7

PWM8

SHDN

3V TO

5.5V

V

CC

R

SET

L12 SW12 L11 SW11 V SW10 L10 SW9 L9

L16 SW16 L15 SW15

V

SW14 L14 SW13 L13

IN

10μF

0.47μF

3595 TA03

RELATED PARTS

PART NUMBER DESCRIPTION

COMMENTS

: 2.3V to 15V, V

LT3463/

LT3463A

Dual Output, Boost/Inverter, 250mA I , Constant Off-Time, High

Efﬁciency Step-Up DC/DC Converter with Integrated Schottky Diodes 3mm × 3mm DFN-10 Package

V

= 40V, I = 40μA, I < 1μA,

OUT(MAX) Q SD

SW

IN

LT3465/

LT3465A

Constant-Current, 1.2MHz/2.7MHz, High Efﬁciency White LED Boost

Regulator with Integrated Schottky Diode

V

: 2.7V to 16V, V

= 34V, I = 1.9mA, I < 1μA,

OUT(MAX) Q SD

IN

ThinSOT^TMPackage

: 2.7V to 24V, V

LT3466/

LT3466-1

Dual Constant-Current, 2MHz, High Efﬁciency White LED Boost

Regulator with Integrated Schottky Diode

V

IN

= 40V, I = 5mA, I < 16μA,

OUT(MAX) Q SD

3mm × 3mm DFN-10 Package

LT3474

LT3475

LT3476

LT3486

LT3491

LT3497

LT3498

36V, 1A (I ), 2MHz, Step-Down LED Driver

V

SD

: 4V to 36V, V

= 13.5V, 400:1 True Color PWM^TM,

LED

IN

OUT(MAX)

I

< 1μA, TSSOP-16E Package

Dual 1.5A (I ), 36V, 2MHz, Step-Down LED Driver

V

SD

: 4V to 36V, V

= 13.5V, 3000:1 True Color PWM,

LED

IN

OUT(MAX)

I

< 1μA, TSSOP-20E Package

Quad Output 1.5A, 2MHz High Current LED Driver with 1000:1

Dimming

V

SD

: 2.8V to 16V, V

< 10μA, 5mm × 7mm QFN-10 Package

= 36V, 1000:1 True Color PWM,

IN

OUT(MAX)

I

Dual 1.3A , 2MHz High Current LED Driver

V

SD

: 2.5V to 24V, V

< 1μA, 5mm × 3mm DFN and TSSOP-16E Packages

= 36V, 1000:1 True Color PWM,

IN

OUT(MAX)

I

Constant-Current, 2.3MHz, High Efﬁciency White LED Boost

Regulator with Integrated Schottky Diode

V

IN

: 2.5V to 12V, V

= 27V, I = 2.6mA, I < 8μA,

OUT(MAX) Q SD

2mm × 2mm DFN-6 and SC70 Packages

Dual 2.3MHz, Full Function LED Driver with Integrated Schottky

Diodes and 250:1 True Color PWM Dimming

V

IN

: 2.5V to 10V, V = 32V, I = 6μA, I < 12μA,

OUT(MAX)

Q

SD

3mm × 2mm DFN-10 Package

2.3MHz, 20mA LED Driver and OLED Driver with Integrated Schottky V : 2.5V to 12V, V

Diodes

= 32V, I = 1.65mA, I < 9μA,

IN

OUT(MAX)

Q

SD

3mm × 2mm DFN-12 Package

LT3517/LT3518 2.3A/1.3A 45V, 2.5MHz Full Featured LED Driver with True Color

PWM Dimming

V

SD

: 3V to 30V/40V, V

= 42V, 3000:1 True Color PWM,

IN

OUT(MAX)

I

< 5μA, 4mm × 4mm QFN-16 Package

LT3590

48V Buck Mode LED Driver

V

: 4.5V to 55V, V

= 5V, I = 700μA, I < 15μA,

IN

OUT(MAX) Q SD

2mm × 2mm DFN-16 and SC70 Packages

LT3591

Constant-Current, 1MHz, High Efﬁciency White LED Boost Regulator

V

IN

: 2.5V to 12V, V = 40V, I = 4mA, I < 9μA,

OUT(MAX)

Q

SD

with Integrated Schottky Diode and 80:1 True Color PWM Dimming 3mm × 2mm DFN-8 Package

True Color PWM and ThinSOT are trademarks of Linear Technology Corporation.

3595f

LT 0807 • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

16

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com


型号：	LT3595
厂家：	Linear
描述：	16 Channel Buck Mode LED Driver 16通道降压模式LED驱动器驱动器
文件：	总16页 (文件大小：360K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT3595 [Linear]

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