SGM3122 Datasheet, PDF (4/17 Pages) SG Micro Corp – PWM Brightness Control

SGM3122
White LED Charge Pump Current
Source with PWM Brightness Control
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, EN1 = EN2 = VIN, TA = 25°C, unless otherwise noted.)
PARAMETER
SUPPLY VOULTAGE AND CURRENT
Input Voltage Range
Quiescent Power Supply Current
Shutdown Supply Current
CHARGE PUMP STAGE
Overvoltage Limit
Start-Up Time
Soft-Start Duration
Switching Frequency
Efficiency
Shutdown Temperature
SYMBOL
CONDITIONS
VIN
ILED = 25mA
VIN = 4.2V, 1× mode, EN1 = EN2 = 1 ISET = 0μA
IQ
VIN = 4.2V, 1× mode, EN1 = EN2 = 1 ISET = 20μA
I_OUT = 0mA, 1.5× mode
I_SD
EN1 = EN2 = GND
V_OUT
LED1 unconnected V_IN = 4.2V
C_OUT = 1μF, I_DX ≥ 0.9 × I_{DX_SET}
f
η
VIN = 3.7V, ILED = 15mA each, VDX = 3.1V
Temperature rising
Shutdown Temperature Hysteresis
Input Current Limit
CURRENT SINKS
Recommended Maximum Current per
Current Sink
I_DX
Current into Each Current Sink
when ISET is Shorted to GND
I_DX
Current Matching between Any
Two Outputs
Line Regulation
Reference Voltage for Current Set
V_ISET
Recommended ISET Pin Current Range ISET
IDX to ISET Current Ratio
K
Voltage at DX to GND
VSOURCE
EN1, EN2
EN1,EN2 High Level Input Voltage
EN1,EN2 Low Level Input Voltage
EN1,EN2 Trip Point Hysteresis
EN2 Input Leakage Current
EN1 Input Leakage Current
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
Frequency Range at PWM
Recommended ON-Time for PWM Signal
Shutdown Delay Time
V_IH
V_IL
I_IKG
I_IKG
V_(UVLO)
EN1 = EN2 = 1, I_SET = 100μA
3.2V ≤ V_IN ≤ 5.5V
3.0V ≤ V_IN ≤ 5.5V ISET shorted to GND
VDX = 3.1V, TA = 25℃
3V < V_IN < 5.5V, V_LED = 3.1V, EN1 = EN2 = 1,
ISET = 80μA
EN2 = 0, EN1 = 1
EN2 = 1, EN1 = 0
EN2 = 1, EN1 = 1
EN1 = EN2 = 1, ISET = 80μA
EN2 = 0, EN1 = 1
EN2 = 1, EN1 = 0
EN2 = 1, EN1 = 1
EN1, EN2 = GND or EN1, EN2 = V_IN = 5.5V
EN1, EN2 = GND or EN1, EN2 = V_IN = 5.5V
Input voltage falling
MIN TYP MAX UNITS
2.7
5.5 V
100
μA
200
μA
2
mA
0.1 1 μA
5.3
V
150
μs
130
μs
0.6 1 1.4 MHz
83
%
160
℃
20
℃
300
mA
30
mA
45
mA
-3 0.5 3
%
0.8
%
200
400
mV
580 600 620
2
130 μA
230 255 280
200
300
mV
400
1.3
V
0.3 V
75
mV
0.1 1 μA
0.1 1 μA
2.1
V
20
mV
0
50 kHz
2.5
μs
0.85
ms
SG Micro Corp
4
www.sg-micro.com