SGM3127
White LED Driver with
Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3127 low-dropout bias supply for white LEDs
is a high-performance alternative to the simple ballast
resistors used in conventional white LED designs. It is
optimized
for
low
power
keypad
and
portable
backlighting applications.
The SGM3127 uses an internal resistor to set the bias
current for four LEDs, which are matched to ±5%. The
SGM3127's advantages over ballast resistors include
much lower bias variation with supply voltage variation,
significantly lower dropout voltage, and in some
applications, significantly improved efficiency.
The SGM3127 requires only a 50mV dropout voltage at
a 30mA load on each output to match the LED
brightness.
The SGM3127 is available in Green SOT-23-6 package.
It operates over an ambient temperature range of -40℃
to +85℃.
FEATURES
●
Support up to 4 LEDs
●
Low 50mV Dropout at 30mA
●
Less than ±5% LED Current Matching
●
Simple LED Brightness Control
●
Low Shutdown Current
●
2.5V to 5.5V Supply Voltage Range
●
Thermal Shutdown Protection
●
Operating Temperature Range: -40℃ to +85℃
●
Available in Green SOT-23-6 Package
APPLICATIONS
Wireless Handsets
MP3, MP4, and PMP
Cellular Phones
Portable Communication Devices
Digital Cameras, Camcorders
PDAs, Palmtops, and Handy Terminals
LED/Display Back Light Driver
LEDs for Camera Flash
Battery-Powered Equipment
SG Micro Corp
www.sg-micro.com
REV. A. 3
SGM3127
PACKAGE/ORDERING INFORMATION
MODEL
SGM3127
ORDER NUMBER
SGM3127YN6G/TR
PACKAGE
DESCRIPTION
SOT-23-6
White LED Driver with
Low Dropout Current Source
SPECIFIED
TEMPERATURE
RANGE
-40℃ to +85℃
PACKAGE
OPTION
Tape and Reel, 3000
MARKING
INFORMATION
S01XX
NOTE: Order number and package marking are defined as the follow:
ORDER NUMBER
SGM3127 X X G / TR
Tape and Reel
Green Product
Package Type
N6
Y
SOT-23-6
-40℃ to +85℃
MARKING INFORMATION
S01 X X
Month assembled ("A" = Jan. "B" = Feb.
…
"L" = Dec.)
Year assembled ("9" = 2009, "A" = 2010
…)
For example: S019A (2009 year, the 1st month)
Operating Temperature Range
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND…………….……...……....………….-0.3V to 6V
The Other Pins to GND…………….…………...-0.3V to 6V
Storage Temperature Range..…….……...-65℃ to +150℃
Junction Temperature………………….……………...150℃
Operating Temperature Range…………… -40℃ to +85℃
Power Dissipation, P
D
@ T
A
= 25℃
SOT-23-6…………………………….…….……………..0.5W
Package Thermal Resistance
SOT-23-6,
θ
JA
………………………….…………….250℃/W
Lead Temperature Range (Soldering 10 sec)
…………………………………..…….…….………….. 260℃
ESD Susceptibility
HBM………………………………………….…….……4000V
MM………………………………………….…….………400V
CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation
procedures can cause damage. ESD damage can range from
subtle performance degradation to complete device failure.
Precision integrated circuits may be more susceptible to
damage because very small parametric changes could cause
the device not to meet its published specifications.
SGMICRO reserves the right to make any change in circuit
design, specification or other related things if necessary
without notice at any time. Please contact SGMICRO sales
office to get the last datasheet.
NOTE:
Stresses beyond those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. These
are stress ratings only, and functional operation of the device
at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
SG Micro Corp
www.sg-micro.com
2
SGM3127
PIN CONFIGURATION
(TOP VIEW)
EN
1
White LED Driver with
Low Dropout Current Source
6
LED1
S01XX
SOT-23-6
GND
2
5
LED2
LED4
3
4
LED3
PIN DESCRIPTION
PIN
1
2
3
4
5
6
NAME
EN
GND
LED4
LED3
LED2
LED1
FUNCTION
Enable Input/Power Input. (Active High). When disabled, LED1, LED2, LED3 and LED4 are high
impedance. When enabled, EN is the power input for the SGM3127.
Ground.
LED4 Output Pin. Connect to
Impedance when EN is Low.
LED3 Output Pin. Connect to
Impedance when EN is Low.
LED2 Output Pin. Connect to
Impedance when EN is Low.
LED1 Output Pin. Connect to
Impedance when EN is Low.
LED4’s Cathode. 30mA Constant Current Output. LED4 is High
LED3’s Cathode. 30mA Constant Current Output. LED3 is High
LED2’s Cathode. 30mA Constant Current Output. LED2 is High
LED1’s Cathode. 30mA Constant Current Output. LED1 is High
SG Micro Corp
www.sg-micro.com
3
SGM3127
White LED Driver with
Low Dropout Current Source
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.7V, T
A
= +25℃, unless otherwise noted.)
PARAMETER
Operation Voltage Range
Under-Voltage Lockout
UVLO Hysteresis
LED Sink Current
Quiescent Power Supply Current
LED Dropout Voltage
Shutdown Supply Current
LED Current Deviation Matching
OPT
OPT Hysteresis
Input High Voltage at EN
Input Low Voltage at EN
V
IH
V
IL
2.5
0.7
I
SHDN
D
LED
I
LED
I
EN
I
LED
= 0
I
LED
= 30mA, V
LED
@ I
LEDn
= 90% × I
LED
V
EN
< 0.4V
-5
150
10
27
SYMBOL
V
EN
V
UVLO
Falling
CONDITIONS
MIN
2.5
2.1
110
30
240
50
1
+5
33
TYP
MAX
5.5
UNITS
V
V
mV
mA
μA
mV
μA
%
℃
℃
V
V
SG Micro Corp
www.sg-micro.com
4
SGM3127
White LED Driver with
Low Dropout Current Source
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current vs. Input Voltage
50
40
LED Current (mA)
30
20
10
0
2
2.5
3
3.5
4
4.5
Input Voltage (V)
5
5.5
LED1
LED2
LED3
LED4
LED Current vs. EN Voltage
50
40
LED Current (mA)
30
20
10
0
1.5
2.5
3.5
EN Voltage (V)
4.5
5.5
EN Current vs. EN Supply Voltage
300
250
200
150
100
50
0
1.5
2.5
3.5
4.5
EN Supply Voltage (V)
5.5
LED Current (mA)
35
33
31
29
27
25
-40
LED Current vs. Temperature
EN Current (μA)
-15
10
35
60
85
Temperature (℃)
SG Micro Corp
www.sg-micro.com
5
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