SGM3743 [SGMICRO]
2-Channel White LED Driver for Smart Phone;
| 型号： | SGM3743 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | 2-Channel White LED Driver for Smart Phone |
| 文件： | 总14页 (文件大小：848K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3743
2-Channel White LED Driver for Smart Phone
GENERAL DESCRIPTION
FEATURES
The SGM3743 is a 2-channel white LED driver with
high efficiency boost regulator. With an internal
40V/1.5A power MOSFET, it is well suited for smart
phone backlight applications powered by 1-cell Li-Ion
battery. The supply voltage operates from 3V to 18V.
● Input Voltage Range: 3V to 18V
● Support up to 30mA Current per String
● Integrated 40V/1.5A MOSFET
● Up to 90% Efficiency
● Adaptive Boost Regulator
● Switching Frequency: 1.2MHz
The boost output has an adaptive voltage regulation
with enough low headroom voltage. The SGM3743 is
capable of driving up to 10S2P white LEDs while
achieving high efficiency. It supports both PWM
dimming control and one-wire digital dimming control. A
programmable 9-bit brightness code allows for LED
brightness control.
● Optimized Rise Time and Fall Time to Reduce
EMI on SW Pin
● 1% Regulated LED Current Matching and Accuracy
● Very Low Headroom Voltage: 90mV
● Independent Digital and PWM Dimming Control
● One-Wire Digital Dimming Interface
● PWM Dimming Interface
The SGM3743 includes a comprehensive set of
protection features such as 38.5V over-voltage
protection, over-current protection and thermal
shutdown. Built-in soft-start circuitry avoids excessive
inrush current during startup.
● Up to 9-Bit Resolution for LED Brightness
● Automatic Soft-Start for Reducing Inrush Current
● Dimming Stable in More than 1:500 PWM Range
● PFM Mode at Light Load
● Support 4.7μH Inductor
● Protection Features
The SGM3743 is available in a Green WLCSP
-1.32×1.32-9B package. It operates over an ambient
temperature range of -40℃ to +85℃.
Over-Voltage Protection
LED Open or Short Protection
Thermal Shutdown
● -40℃ to +85℃ Operating Temperature Range
● Available in a Green WLCSP-1.32×1.32-9B Package
TYPICAL APPLICATION CIRCUIT
L
10μH
VBAT
3V to 18V
APPLICATIONS
R2
10Ω
C1
1μF
D1
VIN
SW
C3
1μF
Smart Phones
C2
SGM3743
1μF
GPS Receivers
Handheld Devices
Enable
PWM Dimming
EN
PWM
IFB1
IFB2
Backlight for Media Form Factor
LCD Displays with 1-Cell Battery
COMP
C4
ISET
330nF
RISET
63.4kΩ
GND
SG Micro Corp
FEBRUARY 2021 – REV. A. 1
www.sg-micro.com
SGM3743
2-Channel White LED Driver for Smart Phone
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
XXXX
G06
SGM3743 WLCSP-1.32×1.32-9B
SGM3743YG/TR
Tape and Reel, 3000
-40℃ to +85℃
MARKING INFORMATION
NOTE: XXXX = Date Code and Trace Code.
Date Code - Year
Trace Code
X X X X
Y Y Y
Serial Number
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.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
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.
VIN.......................................................................0.3V to 20V
EN, PWM to GND............................................... .-0.3V to 6V
COMP, ISET to GND ........................................... -0.3V to 3V
SW, IFB1, IFB2 to GND..................................... -0.3V to 40V
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering 10s).............................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
HBM .....................................................................................4000V
MM ......................................................................................... 200V
CDM.....................................................................................1000V
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.
RECOMMENDED OPERATING CONDITIONS
Supply Voltage Range............................................3V to 18V
Operating Temperature Range.......................-40℃ to +85℃
Operating Junction Temperature Range, TJ
......................................................................-40℃ to +125℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
2
SGM3743
2-Channel White LED Driver for Smart Phone
PIN CONFIGURATION
SGM3743 (TOP VIEW)
1
2
3
ISET
IFB2
IFB1
A
B
C
PWM
EN
COMP
VIN
GND
SW
WLCSP-1.32×1.32-9B
PIN DESCRIPTION
PIN
NAME
I/O
FUNCTION
Current Setting Pin. Connect an external resistor from this pin to ground to set
the maximum LED current.
A1
ISET
I
A2
A3
B1
IFB2
IFB1
PWM
I
I
I
Regulated Current Sink 2.
Regulated Current Sink 1.
PWM Dimming Input.
Transconductance Error Amplifier Output. Connect an external capacitor from
COMP to ground to compensate the converter.
B2
COMP
O
B3
C1
C2
C3
GND
EN
O
I
Ground Pin.
Enable Control and One-Wire Digital Dimming Input.
Input Supply Pin.
VIN
SW
I
I
Drain Connection for Internal Low-side N-Channel MOSFET.
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
3
SGM3743
2-Channel White LED Driver for Smart Phone
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, EN = high, PWM = high, IFB = 20mA, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Power Supply
Input Voltage Range
VIN
IQ
3
18
V
+25℃
+25℃
Device enable, switching 1.2MHz and
no load, VIN = 3.6V
Operating Quiescent Current into VIN
Shutdown Current
1.2
1.7
mA
μA
ISD
EN = low
VIN falling
VIN rising
0.4
2.25
2.35
100
1
+25℃
+25℃
+25℃
+25℃
2.45
Under-Voltage Lockout Threshold
UVLO
VHYS
V
Under-Voltage Lockout Hysterisis
mV
EN and PWM
Logic High Voltage
EN/PWM
VIH
VIL
Full
Full
1.6
V
V
Threshold
Logic Low Voltage
0.3
EN Pin and PWM Pin Internal
Pull-Down Resistor
RPD
800
kΩ
+25℃
PWM Logic Low Width to Shutdown
EN Logic Low Width to Shutdown
PWM Dimming Signal Frequency
Minimum PWM On-Time
Regulation
tPWM_SD
tEN_SD
PWM high to low
EN high to low
40
5
ms
ms
kHz
ns
+25℃
+25℃
+25℃
+25℃
fPWM
10
30
100
tPWM_ON(MIN)
ISET Pin Voltage
VISET_FULL
KISET_FULL
IFB_AVG
KM
Full brightness
Full
1.18
-3.5
30
1.213
1050
1
1.24
V
Current Multiplier
Full brightness
+25℃
+25℃
+25℃
+25℃
Current Accuracy
IISET = 20μA, D = 100%
D = 100%
3.5
2
%
%
(IMAX – IAVG) / IAVG
1
Current Sink Max Output Current
Power Switch
IIFB_MAX
IISET = 35μA, each IFBx pin
mA
VIN = 3.6V
0.35
0.38
0.1
+25℃
+25℃
+25℃
Switch MOSFET On-Resistance
RDS(ON)
ILEAK_SW
Ω
VIN = 3V
Switch MOSFET Leakage Current
Oscillator
1
μA
VSW = 35V, TA = 25℃
Oscillator Frequency
fS
Full
1000
1200
95
1350
kHz
Measured on the drive signal of switch
MOSFET
Maximum Duty Cycle
DMAX
%
+25℃
Boost Voltage Control
IIFBx = 20mA, measured on IFBx pin
which has a lower voltage
IFBx Feedback Regulation Voltage
VIFB_REG
90
mV
+25℃
COMP Pin Sink Current
ISINK
ISOURCE
GEA
12
5
μA
μA
+25℃
+25℃
+25℃
+25℃
+25℃
COMP Pin Source Current
Error Amplifier Transconductance
Error Amplifier Output Resistance
Error Amplifier Crossover Frequency
55
100
1.2
μmho
MΩ
REA
fEA
5pF connected to COMP pin
MHz
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
4
SGM3743
2-Channel White LED Driver for Smart Phone
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3.6V, EN = high, PWM = high, IFB = 20mA, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Protection
Switch MOSFET Current Limit
Switch MOSFET Start Up Current Limit
Time Window for Half Current Limit
SW Pin Over-Voltage Threshold
IFBx Pin Over-Voltage Threshold
Digital One-Wire Interface
One-Wire Detection Delay
One-Wire Detection Time
One-Wire Detection Window (1)
Start Time of Program Stream
End Time of Program Stream
High Time of Low Bit
ILIM
D = DMAX
D = DMAX
1.15
1.5
0.6
6
1.75
A
A
+25℃
+25℃
+25℃
Full
ILIM_START
tHALF_LIM
VOVP_SW
VOVP_IFB
ms
V
37.5
38.5
4.5
39.7
Measured on IFBx pin
V
+25℃
tOW_DELAY
tOW_DET
tOW_WIN
tSTART
tEOS
Measured from EN low to high
EN pin low time
100
μs
μs
ms
μs
μs
μs
μs
μs
μs
μs
μs
V
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
+25℃
260
Measured from EN low to high
1
6
6
360
180
360
360
180
4
tH_LB
Logic 0
Logic 0
Logic 1
Logic 1
6
Low Time of Low Bit
tL_LB
2 × tH_LB
2 × tL_HB
6
High Time of High Bit
tH_HB
Low Time High Bit
tL_HB
Acknowledge Valid Time
tvalACKN
tACKN
Duration of Acknowledge Condition
Acknowledge Output Voltage Low(2)
Thermal Shutdown
512
0.4
VACKNL
Open drain, RPULL-UP = 15kΩ to VIN
Thermal shutdown threshold
Thermal shutdown hysteresis
TSHDN
THYS
150
15
℃
℃
NOTES:
1. Drive the EN pin low for longer than tOW_DET after tOW_DELAY delay and before tOW_WIN expires, in order to select one-wire digital
interface.
2. This condition is only applied when RFA = 1. Use this feature only when the master has an open-drain output and the data line
is required to pull high by the master through a pull-up resistor.
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
5
SGM3743
2-Channel White LED Driver for Smart Phone
RECOMMENDED COMPONENTS OF TEST CIRCUITS
Component
Component
Inductor
Diode
10μH/CD75NP-100KC
Capacitor
1μF/C2012X7R1H105KT
MBR0540
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up
Start-Up
PWM
PWM
VIN = 3.6V, VOUT = 21V, ILED = 20mA,
L = 10μH, Duty = 100%,
7S2P LEDs
VIN = 3.6V, VOUT = 21V, ILED = 20mA,
L = 10μH, fPWM = 20kHz, Duty = 50%,
7S2P LEDs
IL
VOUT
IOUT
IL
VOUT
IOUT
Time (10ms/div)
Shutdown
Time (10ms/div)
Shutdown
PWM
IL
PWM
IL
VOUT
IOUT
VOUT
VIN = 3.6V, VOUT = 21V, ILED = 20mA,
L = 10μH, fPWM = 20kHz, Duty = 50%,
7S2P LEDs
VIN = 3.6V, VOUT = 21V,
L = 10μH, Duty = 100%,
IOUT
ILED = 20mA, 7S2P LEDs
Time (10ms/div)
Time (10ms/div)
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
6
SGM3743
2-Channel White LED Driver for Smart Phone
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Switching Waveform
Switching Waveform
VSW
VSW
VFB
AC Coupled
VOUT
IL
IL
IOUT
IOUT
VIN = 3.6V, VOUT = 21V, ILED = 20mA, L = 10μH,
Duty = 100%, 7S2P LEDs
VIN = 3.6V, VOUT = 21V, ILED = 20mA, L = 10μH,
Duty = 100%, 7S2P LEDs
Time (800ns/div)
Time (800ns/div)
Switching Waveform
Switching Waveform
VSW
VSW
VFB
AC Coupled
VIN = 3.6V,
VIN = 3.6V,
VOUT = 21V, ILED = 20mA,
VOUT
VOUT = 21V, ILED = 20mA,
L = 10μH, fPWM = 20kHz,
Duty = 10%, 7S2P LEDs
L = 10μH, fPWM = 20kHz,
Duty = 10%, 7S2P LEDs
IL
IL
IOUT
IOUT
Time (4μs/div)
Time (4μs/div)
Dimming Transient Waveform
Dimming Linearity
50
40
30
20
10
0
VOUT = 21V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 7S2PLEDs
VSW
VIN = 4.2V
IL
VIN = 3.6V, VOUT = 21V, ILED = 20mA, L = 10μH,
Duty = 10% to 80% and back to 10%, fPWM = 20kHz,
7S2P LEDs
VIN = 3V
VIN = 5V
VOUT
VIN = 3.6V
IOUT
0
20
40
60
80
100
Time (400ms/div)
PWM Duty Cycle (%)
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
7
SGM3743
2-Channel White LED Driver for Smart Phone
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Efficiency vs. PWM Duty Cycle
VIN = 4.2V
Efficiency vs. PWM Duty Cycle
100
90
80
70
60
50
100
90
80
70
60
50
VIN = 4.2V
VIN = 5V
VIN = 5V
VIN = 3.6V
VIN = 3.6V
V
IN = 3V
VIN = 3V
VOUT = 18V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 6S2PLEDs
VOUT = 15V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 5S2PLEDs
0
0
0
20
40
60
80
100
100
100
0
20
40
60
80
100
PWM Duty Cycle (%)
PWM Duty Cycle (%)
Efficiency vs. PWM Duty Cycle
VIN = 4.2V
Efficiency vs. PWM Duty Cycle
IN = 4.2V
100
90
80
70
60
50
100
90
80
70
60
50
V
VIN = 5V
VIN = 5V
VIN = 3.6V
VIN = 3.6V
VIN = 3V
VIN = 3V
VOUT = 21V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 7S2PLEDs
VOUT = 24V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 8S2PLEDs
20
40
60
80
0
20
40
60
80
100
PWM Duty Cycle (%)
PWM Duty Cycle (%)
Efficiency vs. PWM Duty Cycle
VIN = 4.2V
Efficiency vs. PWM Duty Cycle
VIN = 4.2V
100
90
80
70
60
50
100
90
80
70
60
50
VIN = 5V
VIN = 3.6V
VIN = 3.6V
VIN = 5V
VIN = 3V
VIN = 3V
VOUT = 27V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 9S2PLEDs
VOUT = 30V, ILED = 20mA, fPWM = 20kHz,
L = 10μH, 10S2PLEDs
20
40
60
80
0
20
40
60
80
100
PWM Duty Cycle (%)
PWM Duty Cycle (%)
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
8
SGM3743
2-Channel White LED Driver for Smart Phone
DETAILED DESCRIPTION (continued)
Table 1. One-Wire Digital Interface Bit Description
TRANSMISSION
DIRECTION
BIT NUMBER
NAME
DESCRIPTION
23 (MSB)
22
A7
A6
21
A5
20
A4
Device Address: 0x8F
IN
19
A3
18
A2
17
A1
16
A0
15
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
14
13
Reserved. Write 0 to this bit.
12
11
Request for acknowledge. If RFA = 1, the data line is pulled low when the
device receives the command well. It is only used when the master has an
open-drain output and the data line is required to pull high by the master
through a pull-up resistor. Otherwise, do not set RFA to 1.
10
RFA
9
Bit 9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Reserved. Write 0 to this bit.
IN
8
7
6
5
4
9-bit Brightness Code
3
2
1
0 (LSB)
DATA IN
Data Byte
Address Byte
Bit 11 ~ A0
A1
1
A2
1
A3
1
A4
0
A5
0
A6
0
A7
1
S
D0
D1
D2
D3
D4
D5
D6
D7
D8 Bit 9 RFA
P
Bit 15
1
ACK
DATA OUT
Figure 1. One-Wire Digital Interface Protocol Overview
SG Micro Corp
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FEBRUARY 2021
9
SGM3743
2-Channel White LED Driver for Smart Phone
ADDITIONAL APPLICATION CIRCUITS
L
10μH
VBAT
3V to 18V
R2
C1
1μF
10Ω
D1
VIN
SW
C3
1μF
C2
SGM3743
1μF
Enable
PWM Dimming
EN
PWM
IFB1
IFB2
COMP
C4
330nF
ISET
RISET
63.4kΩ
GND
Figure 2. SGM3743 Typical Application (PWM interface enabled, EN pin can be used to enable or disable the IC)
L
10μH
VBAT
3V to 18V
R2
C1
1μF
10Ω
D1
VIN
SW
C3
1μF
C2
SGM3743
1μF
EN
PWM Dimming
PWM
IFB1
IFB2
COMP
C4
330nF
ISET
RISET
63.4kΩ
GND
Figure 3. SGM3743 Typical Application
(PWM interface enabled, EN pin connected to VIN, only PWM signal is used to enable or disable the IC)
SG Micro Corp
www.sg-micro.com
FEBRUARY 2021
10
SGM3743
2-Channel White LED Driver for Smart Phone
ADDITIONAL APPLICATION CIRCUITS (continued)
L
10μH
VBAT
3V to 18V
R2
C1
1μF
10Ω
D1
VIN
SW
C3
1μF
C2
SGM3743
1μF
One-Wire
Command
EN
Enable
PWM
IFB1
IFB2
COMP
C4
330nF
ISET
RISET
63.4kΩ
GND
Figure 4. SGM3743 Typical Application
(One-Wire digital interface enabled, PWM pin can be used to enable or disable the IC)
L
10μH
VBAT
3V to 18V
R2
C1
1μF
10Ω
D1
VIN
SW
C3
1μF
C2
SGM3743
1μF
PWM
One-Wire
Command
EN
IFB1
IFB2
COMP
C4
ISET
330nF
RISET
63.4kΩ
GND
Figure 5. SGM3743 Typical Application
(One-Wire digital interface enabled, PWM pin connected to VIN, only EN signal is used to enable or disable the IC)
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
FEBRUARY 2021 ‒ REV.A to REV.A.1
Page
Updated Marking Information section...................................................................................................................................................................2
Changes from Original (JUNE 2016) to REV.A
Page
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
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FEBRUARY 2021
11
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
WLCSP-1.32×1.32-9B
NOTE: All linear dimensions are in millimeters.
SG Micro Corp
TX00105.000
www.sg-micro.com
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
WLCSP-1.32×1.32-9B
7″
9.5
1.38
1.38
0.70
4.0
4.0
2.0
8.0
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
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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