SGM3138
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3138 is a high performance white LED driver. It
integrates current sources and automatic mode selection
charge pump. The part maintains the high efficiency by
utilizing a 1×/1.5× fractional charge pump and low
dropout current sources. The small equivalent 1× mode
open loop resistance and ultra-low dropout voltage of
current source extend the operating time of 1× mode and
optimize the efficiency of Li-ion battery in white LED
applications.
The SGM3138 supports up to 6 white LEDs and
regulates a constant current which the initial value can be
set by an internal resistor. The part implements a 4-bit
DAC for brightness control. Users can easily configure
the LED current from 1.25mA to 20mA by a serial pulse.
The dimming of white LEDs current can be achieved by
applying a pulse signal to the EN/SET pin. There are
totally 16 steps of current could be set by users. The
operating voltage range is 2.7V to 5.5V. Internal soft-start
circuitry effectively reduces the in-rush current while both
start-up and mode transition.
The SGM3138 is available in Green TQFN-3×3-16L
package and is rated over the -40℃ to +85℃ temperature
range.
FEATURES
Input Voltage Range: 2.7V to 5.5V
Drives Up to 6 LEDs at 20mA Each
One Single Wire Interface
16-Step Brightness Control
High Efficiency by Fractional Conversion with
1× and 1.5× Modes
Switching Frequency: 1MHz
Regulated Output Current with ±5% Matching
Internal Soft-Start Limits Inrush Current
Low Input Ripple and Low EMI
Over-Current and Over-Temperature Protection
Under-Voltage Lockout with Hysteresis
Available in Green TQFN-3×3-16L Package
APPLICATIONS
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
SG Micro Corp
www.sg-micro.com
REV. A. 4
SGM3138
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
PACKAGE/ORDERING INFORMATION
MODEL
SGM3138
ORDER NUMBER
SGM3138YTQ16G/TR
PACKAGE
DESCRIPTION
TQFN-3×3-16L
SPECIFIED
TEMPERATURE
RANGE
-40℃ to +85℃
PACKAGE
OPTION
Tape and Reel, 3000
MARKING
INFORMATION
3138TQ
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND……………………...……...….....….….. -0.3V to 6.0V
The Other Pins to GND…………………..……....….. -0.3V to V
IN
Power Dissipation, P
D
@ T
A
= 25℃
TQFN-3×3-16L………………………………..…………..…1.47W
Storage Temperature Range...………….....…...-65℃ to +150℃
Junction Temperature………………………..……………...150℃
Operating Temperature Range...…………...……-40℃ to +85℃
Lead Temperature (Soldering 10 sec)
…………………………………..……………....….….…….. 260℃
ESD Susceptibility
HBM…………………………………………..….…………...2000V
MM………………………………………….…...………..……200V
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.
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 latest datasheet.
SG Micro Corp
www.sg-micro.com
2
SGM3138
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
PIN CONFIGURATION
(TOP VIEW)
N.C.
16
LED6
LED5
LED4
LED3
1
2
EN/
SET AGND VIN
15
14
13
12 C2N
11 C1N
GND
3
4
5
6
7
8
10 C1P
9
C2P
LED2 LED1 PGND VOUT
TQFN-3×3-16L
PIN DESCRIPTION
PIN
1, 2, 3,
4, 5, 6
7
8
9
10
11
12
13
14
15
16
Exposed
Pad
NAME
LED6－LED1
PGND
VOUT
C2P
C1P
C1N
C2N
VIN
AGND
EN/SET
N.C.
GND
I/O
I
-
O
-
-
-
-
I
-
I
-
-
FUNCTION
Current Sink Input. Connect the cathode of the white LEDs to these inputs.
Power Ground.
Connect the output capacitor and the anode of the LEDs to this pin.
Positive Terminal of Bucket Capacitor 2.
Positive Terminal of Bucket Capacitor 1.
Negative Terminal of Bucket Capacitor 1.
Negative Terminal of Bucket Capacitor 2.
Supply Voltage Input.
Analog Ground.
LED1 to LED6 Enable (Active High) and Dimming Control. Connect to GPIO
pin of MCU.
No Internal Connection.
Exposed pad should be soldered to PCB board and connected to GND.
SG Micro Corp
www.sg-micro.com
3
SGM3138
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6V, EN/SET = V
IN
, T
A
= +25℃, unless otherwise noted.)
PARAMETER
SUPPLY VOULTAGE AND CURRENT
Input Voltage Range
Quiescent Power Supply Current
Shutdown Supply Current
CHARGE PUMP STAGE
Over-Voltage Limit
Start-Up Time
Soft-Start Duration
Switching Frequency
Efficiency
Shutdown Temperature
Shutdown Temperature Hysteresis
Input Current Limit
CURRENT SINKS
Recommended Maximum Current per
Current Sink
Current Matching between Any Two Outputs
Line Regulation
Voltage at LED
X
to GND
EN/SET LOGIC
Low Time for Shutdown
Low Time for Dimming
High Time for Dimming
Threshold
Logic-High Voltage
Logic-Low Voltage
t
SHDN
t
LO
t
HI
V
IH
V
IL
3
0.5
0.5
1.2
0.6
500
ms
µs
µs
V
V
V
SOURCE
I
LEDx
3.2V
≤
V
IN
≤
5.5V
V
LEDx
= 3.2V, I
LEDx
= 20mA
3.3V < V
IN
< 5.5V, V
LEDx
= 3.2V, EN/SET = 1
V
IN
= 4.2V, EN/SET = 1
18
-5
20
1
3
400
22.5
5
mA
%
%
mV
EN/SET = 1
f
η
V
IN
= 3.45V, V
LEDx
= 3V
Temperature rising
0.6
V
OUT
LEDx unconnected, V
IN
= 4.2V
C
OUT
= 1μF, I
LEDx
≥
0.9 × I
LEDx-set
5.8
235
190
1
85
150
15
300
1.4
V
μs
μs
MHz
%
℃
℃
mA
V
IN
I
Q
I
Q
I
SHDN
V
IN
= 4.2V, 1× Mode, I
LEDx
= 1.25mA
I
OUT
= 0mA, 1.5× Mode
EN/SET = GND
2.7
210
2
0.1
1
5.5
V
μA
mA
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SG Micro Corp
www.sg-micro.com
4
SGM3138
6-Channel Charge Pump White LED
Driver with Low Dropout Current Source
TYPICAL PERFORMANCE CHARACTERISTICS
LED Current Regulation vs. Input Voltage
25
20
15
10
5
0
3.2
3.6
4
4.4
4.8
5.2
5.5
Input Voltage (V)
Efficiency vs. Input Voltage
90
80
Efficiency (%)
70
60
50
40
2.7
3.1
LED V
F
= 3V
3.5
3.9
Input Voltage (V)
4.3
4.7
20mA
LED Current (mA)
SG Micro Corp
www.sg-micro.com
5
微控制器 MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
