SGM3133
4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3133 is a high efficiency and cost effective
charge pump white LED driver. It supports up to 4 white
LEDs and regulates a constant current for uniform
intensity. 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.
User can easily configure each LED current from
1.25mA to 20mA by a pulse dimming control. 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 SGM3133 is available in Green TQFN-3×3-16L
package and is specified over an ambient temperature
range of -40℃ to +85℃.
FEATURES
●
Input Voltage Range: 2.7V to 5.5V
●
Drives up to 4 LEDs at 20mA Each
●
16-Step Brightness Control
●
High Efficiency by Fractional Conversion with
1× and 1.5× Modes
●
Automatic Charge Pump Mode Selection
●
Switching Frequency: 1MHz
●
1% Typical LED Current Matching
●
Internal Soft-Start Limits Inrush Current
●
Low Input Noise and Low EMI
●
Over Current and Over Temperature Protection
●
Output Over Voltage 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. 2
SGM3133
4-Channel Charge Pump White LED Driver
with Low Dropout Current Source
PACKAGE/ORDERING INFORMATION
MODEL
SGM3133
ORDER NUMBER
SGM3133YTQ16G/TR
PACKAGE
DESCRIPTION
TQFN-3×3-16L
SPECIFIED
TEMPERATURE
RANGE
-40℃ to +85℃
PACKAGE
OPTION
Tape and Reel, 3000
MARKING
INFORMATION
3133TQ
ABSOLUTE MAXIMUM RATINGS
VIN to GND……………………......…….……….…..-0.3V to 6.0V
The Other Pins to GND…………………...……….. -0.3V to 6.0V
Package Thermal Resistance
TQFN-3×3-16L,
θ
JA
………………….……….……….…...68℃/W
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
SGM3133
4-Channel Charge Pump White LED Driver
with Low Dropout Current Source
PIN CONFIGURATION
(TOP VIEW)
LED3 LED2 LED1 VIN
16
LED4
N.C.
GND
C1P
1
2
15
14
13
12 EN/SET
11 N.C.
GND
3
4
5
VIN
6
7
8
10 GND
9
C2P
C2N C1N VOUT
TQFN-3×3-16L
PIN DESCRIPTION
PIN
1
2,11
3,10
4
5,13
6
7
8
9
12
14
15
16
Exposed Pad
NAME
LED4
N.C.
GND
C1P
VIN
C2N
C1N
VOUT
C2P
EN/SET
LED1
LED2
LED3
GND
Output Current for LED4.
No Internal Connection.
Ground.
Positive Input for the External Flying Capacitor C1. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Power Input Voltage.
Negative Input for the External Flying Capacitor C2. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Negative Input for the External Flying Capacitor C1. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Output Voltage Source.
Positive Input for the External Flying Capacitor C2. Connect a ceramic 1μF
capacitor close to the pins of the IC.
Chip Enable (Active High) and Dimming Control.
Output Current for LED1.
Output Current for LED2.
Output Current for LED3.
Exposed pad should be soldered to PCB board and connected to GND.
FUNCTION
SG Micro Corp
www.sg-micro.com
3
SGM3133
4-Channel Charge Pump White LED Driver
with Low Dropout Current Source
ELECTRICAL CHARACTERISTICS
(V
IN
= 2.7V to 5.5V, C
IN
= C
OUT
= C1 = C2 = 1μF, T
A
= 25℃, unless otherwise specification.)
PARAMETER
Input
Input Supply Voltage
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Quiescent Power Supply Current
Shutdown Current
1× Mode to 1.5× Mode Transition
Voltage (V
IN
falling)
Hysteresis of Mode Transition
Output
Output Current
Current Matching
EN/SET Logic
Threshold
Logic-High Voltage
Logic-Low Voltage
V
IH
V
IL
T
LO
T
HI
I
IH
I
IL
T
SHDN
f
OSC
V
IH
= V
IN
V
IL
= GND
PWM Dimming
0.5
0.5
0.01
0.01
1.5
1000
1
1
1.5
0.4
500
V
V
μs
μs
μA
μA
ms
kHz
I
LEDx
V
IN
= 3.5V, 100% Setting
V
IN
= 3.5V, 100% Setting
18
-3
20
1
22
3
mA
%
I
Q
I
Q
I
SHDN
V
TS_×1.5
1× Mode, V
IN
= 4V
1.5× Mode, V
IN
= 3.3V
V
EN
= 0.4V
V
F
= 3.25V, I
OUT
= 80mA,
I
LEDx
= 20mA
V
IN
V
IN
Rising
2.7
1.8
2.2
100
0.3
1
0.1
3.45
250
1
2
10
5.5
2.5
V
V
mV
mA
mA
μA
V
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Low Time for Dimming
High Time for Dimming
EN/SET
Current
High Current
Low Current
Low Time for Shutdown
Frequency
Oscillator Frequency
SG Micro Corp
www.sg-micro.com
4
SGM3133
4-Channel Charge Pump White LED Driver
with Low Dropout Current Source
TYPICAL PERFORMANCE CHARACTERISTICS
C
IN
= C
OUT
= C1 = C2 = 1μF, T
A
= +25℃, unless otherwise noted.
SG Micro Corp
www.sg-micro.com
5
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