SGM3738YTQ16G/TR全新原装原理图各脚功能电路原理芯片引脚定义-中国IC网-芯三七

SGM3741B

High Efficiency, 4-Channel,

38V Boost White LED Driver

GENERAL DESCRIPTION

FEATURES

The SGM3741B is a high efficiency constant-current

white LED driver with a 600kHz boost DC/DC converter.

With an internal 38V/2.2A power MOSFET, the

SGM3741B supports up to 10 white LEDs in series and

achieves uniform brightness. The SGM3741B supports

two PWM signals to control the backlight brightness.

The PWM frequency is in the range from 2kHz to

60kHz, thus avoiding audible noise from inductor or

ceramic capacitor. Combining the two PWM signals

gets very wide brightness dimming range. The PWM

pin is always used for Content Adaptive Brightness

Control (CABC).

• Input Voltage Range: 3V to 18V

• Integrated 38V/2.2A Switch with 0.25Ω On-

Resistance

• High Efficiency Boost Bias Supply

• Support up to 10 LEDs in Series per String

• Switching Frequency: 600kHz

• 25mA Constant Current per String

• Dual PWM Dimming Scheme for Large Dimming

Range

• PWM Dimming Frequency: 2kHz to 60kHz

• 1MΩ Pull-Down Resistor on CTRL Pin

• 500kΩ Pull-Up Resistor on PWM Pin

• Automatic Soft-Start for Reducing Inrush Current

• No Leakage from V_INto GND through LED String

• Protection Features

The supply voltage operates from 3V to 18V and is well

suited for various applications powered by 1-cell or

2-cell batteries.

 Over-Voltage Protection

The SGM3741B includes a comprehensive set of

protection features such as 38.5V over-voltage

protection, cycle-by-cycle current limit and thermal

shutdown. Built-in soft-start circuitry avoids excessive

inrush current during startup.

 Cycle-by-Cycle Current Limit

 Thermal Shutdown

• -40℃ to +85℃ Operating Temperature Range

• Available in a Green TQFN-3×3-16L Package

APPLICATIONS

The SGM3741B is available in a Green TQFN-3×3-16L

package. It operates over an ambient temperature

range of -40℃ to +85℃.

TFT LCD Displays

Smart Phones

TYPICAL APPLICATION

L

22μH

D1

V_IN

3V to 18V

14

1

VIN

SW

V_OUT

C_IN

22μF

C_OUT

1μF

2

15

16

PGND

11

_PGNDSGM3741B _VOUT

3

6

5

PWM

CH4

PWM Dimming Control

CTRL

10

CH1

GND

7

SG Micro Corp

www.sg-micro.com

AUGUST2015–REV.A. 1

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

PACKAGE/ORDERING INFORMATION

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

DESCRIPTION

ORDERING

NUMBER

PACKAGE

MARKING

PACKING

OPTION

MODEL

3741BTQ

XXXXX

SGM3741B

TQFN-3×3-16L

SGM3741BYTQ16G/TR

Tape and Reel, 4000

-40℃ to +85℃

MARKING INFORMATION

NOTE: XXXXX = Date Code and Vendor Code.

X X X X X

Vendor Code

Date Code - Week

Date Code - Year

Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If

you have additional comments or questions, please contact your SGMICRO representative directly.

ABSOLUTE MAXIMUM RATINGS

ESD SENSITIVITY CAUTION

SW, VOUT, CH1, CH2, CH3, CH4 to GND........ -0.3V to 40V

VIN to GND........................................................ -0.3V to 20V

CTRL, PWM to GND............................................ -0.3V to 6V

Continuous SW Current................. Internally limited to 1.65A

Junction Temperature.................................................+150℃

Storage Temperature Range........................-65℃ to +150℃

Lead Temperature (Soldering 10s).............................+260℃

ESD Susceptibility

This integrated circuit can be damaged if ESD protections are

not considered carefully. SGMICRO recommends that all

integrated circuits be handled with appropriate precautions.

Failureto observe proper handlingand installation procedures

can cause damage. ESD damage can range from subtle

performance degradation tocomplete device failure. Precision

integrated circuits may be more susceptible to damage

because even small parametric changes could cause the

device not to meet the published specifications.

HBM.............................................................................2000V

MM.................................................................................200V

DISCLAIMER

SG Micro Corp reserves the right to make any change in

RECOMMENDED OPERATING CONDITIONS

Operating Temperature Range.......................-40℃ to +85℃

circuit design, or specifications without prior notice.

OVERSTRESS CAUTION

Stresses beyond those listed in Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to

absolute maximum rating conditions for extended periods

may affect reliability. Functional operation of the device at any

conditions beyond those indicated in the Recommended

Operating Conditions section is not implied.

SG Micro Corp

www.sg-micro.com

AUGUST 2015

2

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

PIN CONFIGURATION

SGM3741B (TOP VIEW)

PGND PGND VIN

16 15 14

NC

13

1

2

3

4

12

11

10

9

SW

NC

VOUT

CH1

CH2

GND

PWM

NC

5

6

7

8

CH4 CTRL GND

CH3

TQFN-3×3-16L

PIN DESCRIPTION

NAME

FUNCTION

1, 2

SW

PWM

NC

Boost Switching Node. Connect an inductor between the VIN and SW pins.

PWM Dimming Input. Pull it high or leave it floating if unused.

3

4, 12, 13

No Connection.

5

CH4

CTRL

GND

CH3

CH2

CH1

VOUT

VIN

Current Sink 4. Connect to the cathode of the LED.

Enable Control and PWM Dimming Input.

6

7

Ground Pin.

8

Current Sink 3. Connect to the cathode of the LED.

Current Sink 2. Connect to the cathode of the LED.

Current Sink 1. Connect to the cathode of the LED.

Output Voltage Pin.

9

10

11

14

Input Supply Pin.

15, 16

Exposed Pad

PGND

GND

Power Ground Pin.

Exposed Pad. It should be soldered to PCB board and connected to GND.

SG Micro Corp

www.sg-micro.com

AUGUST 2015

3

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

ELECTRICAL CHARACTERISTICS

(V_IN= 3.6V, V_CTRL= V_PWM= 3V, L = 10μH, C_IN= 22μF, C_OUT= 1μF, Full = -40℃ to +85℃, typical values are at T_A= +25℃, unless

otherwise specified.)

PARAMETER

SYMBOL

CONDITIONS

TEMP

Full

MIN

TYP

MAX

18

UNITS

V

Input Voltage

V_IN

3

Power Switch Voltage Rating

Switch Frequency

Full

38

V

Full

480

600

2.3

700

2.5

kHz

V

Under-Voltage Lockout Threshold

Under-Voltage Lockout Hysteresis

V_UVLO

V_INRising

+25℃

Full

90

mV

mA

µA

A

Not Switching

0.24

0.8

Supply Current

Switching

Supply Current in Shutdown

Switch Current Limit

I_SHDN

I_LIM

CTRL = GND, V_IN= 3.6V

0.4

1

1.68

2.20

0.25

0.1

2.80

0.39

1

Switch On Resistance

R_DS(ON)

V_IN= 3.6V

Ω

Switch Leakage Current

Internal LED Current per Channel

LED Current Matching

V_SW= 35V, CTRL = GND

µA

mA

%

23.7

-1.3

37.0

25

25.9

1.3

I_LED= 25mA

Over-Voltage Protection Threshold

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

Control

Measured at VOUT pin

38.5

145

15

40.0

V

℃

Logic-High Voltage

Logic-Low Voltage

V_IH

V_IL

V_IN= 3V to 18V

Full

1.5

V

CTRL, PWM Threshold

Full

0.4

Pull-Down Resistor

Pull-Up Resistor

R_PULL-DOWN

R_PULL-UP

t_HIGH(MIN)

t_LOW

1

MΩ

μs

+25℃

Full

0.5

CTRL Pin Logic High Pulse Width Timing

CTRL Pin Logic Low Pulse Width Timing

CTRL Pin Shutdown Pulse Width Timing

Minimum PWM On-Time

0.4

5.5

0.08

2

1000

60

μs

t_OFF

ms

μs

PWM Dimming Frequency

PWM Dimming Duty Cycle ⁽¹⁾

kHz

%

CTRL = HIGH

0.5

+25℃

NOTE:

1. If CTRL pin PWM dimming is also used, the minimum PWM duty cycle for no blind dimming is decided by the following

conditions: the minimum LED current dimmed by two PWM is 0.5% of the internal LED current per channel.

SG Micro Corp

www.sg-micro.com

AUGUST 2015

4

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

TYPICAL PERFORMANCE CHARACTERISTICS

V_IN= 3.6V, I_LED= 25mA, 6-Series 4-Parallel LEDs, L = 22μH, C_IN= 10μF, C_OUT= 1μF, T_A= +25℃, unless otherwise noted.

Efficiency vs. Input Voltage

_LED= 25mA, L = 22μH

Supply Current vs. Input Voltage

Not Sw itching

100

90

80

70

60

50

0.5

0.4

0.3

0.2

0.1

0

I

6S4PLEDs

15 18

3

6

9

12

15

18

3

6

9

12

Input Voltage (V)

Sw itching Frequency vs. Input Voltage

Efficiency vs. PWM Duty Cycle

_LED= 25mA, L = 22μH, f_{PW M}= 20kHz

620

610

600

590

580

570

100

90

80

70

60

50

I

6S4PLEDs

80

0

20

40

60

100

3

6

9

12

15

18

Input Voltage (V)

PWM Duty Cycle (%)

PWM Dimming Linearity

f_PWM= 20kHz

PWM Dimming (20kHz)

100

80

60

40

20

0

V_PWM

V_OUT

I_LED

AC Coupled

f_PWM= 2kHz

V_IN= 3.6V, L = 22μH, I_LED= 25mA, 6S4P LEDs

Time (20μs/div)

0

20

40

60

80

100

PWM Duty Cycle (%)

SG Micro Corp

AUGUST 2015

www.sg-micro.com

5

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V_IN= 3.6V, I_LED= 25mA, 6-Series 4-Parallel LEDs, L = 22μH, C_IN= 10μF, C_OUT= 1μF, T_A= +25℃, unless otherwise noted.

Soft-Start

Steady State Switching

AC Coupled

V_OUT

V_CTRL

V_OUT

V_SW

I_L

I_LED

I_L

V_IN= 3.6V, L = 22μH, I_LED= 25mA, 6S4P LEDs

Time (2ms/div)

Time (800ns/div)

SG Micro Corp

AUGUST 2015

www.sg-micro.com

6

High Efficiency, 4-Channel,

38V Boost White LED Driver

SGM3741B

FUNCTIONAL BLOCK DIAGRAM

VOUT

Internal Power

Vp

LDO

VIN

V_OUTSense

& OVP

OSC & RAMP GEN

(600kHz)

SW

MOSFET

Driver

PWM/PFM

Logic

PWM

+

I_LIMIT

_

I_MAX

Current

Sense

+

V_OUT

Σ

R_S0

PGND

Open & Short

Detection

GM

AMP

Highest V_F

String Detect

V_REF1

R

C

CH4

CHx

CH1

.

R_SET2

+

-

+

_

R_S1

Channel X

R_SET1

Enable

Control

V_Dimming

+

-

PWM Dimming

&

CTRL

Soft-Start

R_S4

R_{PULL_DOWN}

Internal Power

R_{PULL_UP}

PWM

GND

REVISION HISTORY

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

AUGUST 2015 ‒ REV.A to REV.A.1

Page

Changed Electrical Characteristics section..........................................................................................................................................................4

Changes from Original (NOVEMBER 2014) to REV.A

Page

Changed from product preview to production data.............................................................................................................................................All

SG Micro Corp

www.sg-micro.com

AUGUST 2015

7

PACKAGE INFORMATION

PACKAGE OUTLINE DIMENSIONS

TQFN-3×3-16L

D

e

N16

N1

L

D1

E

E1

k

N5

b

BOTTOM VIEW

TOP VIEW

1.7

0.7

A

3.6 2.2 1.7

A1

A2

SIDE VIEW

0.5

0.24

RECOMMENDED LAND PATTERN (Unit: mm)

Dimensions

In Millimeters

Dimensions

In Inches

Symbol

MIN

MAX

0.800

0.050

MIN

MAX

0.031

0.002

A

A1

A2

D

0.700

0.000

0.028

0.000

0.203 REF

0.008 REF

2.900

1.600

2.900

1.600

3.100

1.800

3.100

1.800

0.114

0.063

0.114

0.063

0.122

0.071

0.122

0.071

D1

E

E1

k

0.200 MIN

0.500 TYP

0.008 MIN

0.020 TYP

b

0.180

0.300

0.500

0.007

0.012

0.020

e

L

SG Micro Corp

www.sg-micro.com

TX00081.000

PACKAGE INFORMATION

TAPE AND REEL INFORMATION

REEL DIMENSIONS

TAPE DIMENSIONS

P2

P0

W

Q2

Q4

Q2

Q4

Q2

Q4

Q1

Q3

Q1

Q3

Q1

Q3

B0

Reel Diameter

P1

A0

K0

Reel Width (W1)

DIRECTION OF FEED

NOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL

Reel Width

Reel

Diameter

A0

B0

K0

P0

P1

P2

W

Pin1

Package Type

W1

(mm)

(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant

TQFN-3×3-16L

13″

12.4

3.35

1.13

4.0

8.0

2.0

12.0

Q1

SG Micro Corp

TX10000.000

www.sg-micro.com

PACKAGE INFORMATION

CARTON BOX DIMENSIONS

NOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF CARTON BOX

Length

(mm)

Width

(mm)

Height

(mm)

Reel Type

Pizza/Carton

13″

386

280

370

5

SG Micro Corp

www.sg-micro.com

TX20000.000

型号:	SGM4056-6.8YPS8G/TR
生命周期：	Contact Manufacturer
IHS 制造商：	SG MICRO CORP
包装说明：	HLSOP,
Reach Compliance Code：	unknown
风险等级：	5.66
Base Number Matches：	1

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