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PDF SGM3131 Data sheet ( Hoja de datos )
| Número de pieza | SGM3131 | |
| Descripción | 120mA 4-Channel Charge Pump White LED Driver | |
| Fabricantes | Shengbang Microelectronics | |
| Logotipo |  |
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SGM3131
120mA 4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
GENERAL DESCRIPTION
The SGM3131 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 SGM3131 supports up to 4 white LEDs and
regulates a constant current which the initial value can
be set by an external resistor. The part implements a
4-bit DAC for brightness control. Users can easily
configure the LED current from 0.5mA to 30mA by a
serial pulse. The dimming of white LEDs current can be
achieved by applying a pulse signal to the EN 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 load is disconnected from VIN while shutdown and
the shutdown current is less than 1μA.
SGM3131 is available in Green TQFN-3×3-16L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
FEATURES
Input Voltage Range: 2.7V to 5.5V
Drives up to 4 LEDs at 30mA Each
LED Brightness Control Through 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 1% Matching
Internal Soft-Start Limits Inrush Current
Low Input Ripple and Low EMI
Over Current and Over Temperature Protected
Under Voltage Lockout with Hysteresis
Operating Temperature Range: -40℃ to +85℃
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
1 page  
SGM3131
120mA 4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, EN = VIN, TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
SUPPLY VOULTAGE AND CURRENT
Input Voltage Range
Quiescent Power Supply Current
Shutdown Supply Current
CHARGE PUMP STAGE
VIN
IQ
IQ
ISHDN
VIN = 4.2V, 1× Mode, EN = 1, ISET = 0μA
VIN = 4.2V, 1× Mode, EN= 1, ISET = 20μA
IOUT = 0mA, 1.5× Mode
EN = GND
Overvoltage Limit
Startup Time
Soft-Start Duration
VOUT
LEDx unconnected, VIN = 4.2V
COUT = 1μF, ILEDx ≥ 0.9 × ILEDx-SET
Switching Frequency
f
Efficiency
Thermal Shutdown Temperature
η VIN = 3.25V, ILEDx = 15mA each, VLEDx =2.95V
Temperature rising
Hysteresis Temperature
Input Current Llimit
CURRENT SINKS
Recommended Maximum Current per
Current Sink
Current into Each Current Sink
when ISET is Shorted to GND
Current Matching between Any
Two Outputs
Line Regulation
Reference Voltage for Current Set
Recommended ISET Pin Current Range
ILEDx to ISET Current Ratio
Voltage at LEDx to GND
Enable
EN = 1, ISET = 100μA
ILEDx
ILEDx
VISET
ISET
K
VSOURCE
3.2V ≤ VIN ≤ 5.5V
3.0V ≤ VIN ≤ 5.5V, ISET shorted to GND
VLEDx = 3.1V, TA = 25℃
3V < VIN < 5.5V, VLEDx = 3.1V, EN = 1, ISET = 80μA
EN = 1
EN = 1, ISET = 80μA
EN = 1, ILEDx = 30mA
EN Low Time for Shutdown
EN Low Time for Dimming
EN High Time for Dimming
EN Threshold
Logic-High Voltage
Logic-Low Voltage
TSHDN
TLO
THI
VIH
VIL
MIN TYP MAX UNITS
2.7 5.5
100
200
2
1
V
μA
μA
mA
μA
5.7 V
235 μs
220 μs
0.6 1 1.4 MHz
88 %
150 °C
15 °C
270 mA
30
40
-3 1 +3
2
580 600 620
2 130
230 260 280
400
mA
mA
%
%
mV
μA
mV
3 ms
0.5 500 μs
0.5 μs
1.2 V
0.6 V
SG Micro Corp
www.sg-micro.com
5
5 Page 
SGM3131
120mA 4-Channel Charge Pump White LED
Driver with Low Dropout Current Source
PACKAGE OUTLINE DIMENSIONS
TQFN-3×3-16L
De
N16
L N1
D1
E E1
TOP VIEW
k
N5
b
BOTTOM VIEW
1.7
0.7
A
SIDE VIEW
A1
A2
3.6 2.2 1.7
0.5 0.24
RECOMMENDED LAND PATTERN (Unit: mm)
Symbol
A
A1
A2
D
D1
E
E1
k
b
e
L
Dimensions
In Millimeters
MIN MAX
0.700
0.800
0.000
0.050
0.203 REF
2.900
3.100
1.600
1.800
2.900
3.100
1.600
1.800
0.200 MIN
0.180
0.300
0.500 TYP
0.300
0.500
Dimensions
In Inches
MIN MAX
0.028
0.031
0.000
0.002
0.008 REF
0.114
0.122
0.063
0.071
0.114
0.122
0.063
0.071
0.008 MIN
0.007
0.012
0.020 TYP
0.012
0.020
SG Micro Corp
www.sg-micro.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SGM3131.PDF ] | |
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