MIC2870 Datasheet, PDF (7/25 Pages) Micrel Semiconductor – 1.5A Synchronous Boost Flash LED Driver with I2C Interface

Micrel, Inc.
Typical Characteristics
Shutdown Current
vs. Temperature
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Quiescent Current (Linear Mode)
vs. Temperature
0.94
0.93
0.92
0.91
0.90
0.89
0.88
0.87
-40 -20
LINEAR MODE NOT SWITCHING
V_LED1 = V_LED2 > 200mV
0 20 40 60 80 100 120
TEMPERATURE (°C)
Torch Mode LED1 and LED2
Current vs. Temperature
190
189
188
187
TORCH MODE
L = 1µH
C_OUT = 2.2µF
186
I_LED = 187.5mA
V_LED = 890mV
R_TRSET = 10kΩ
185
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Flash Mode LED1 and LED2
Current vs. Temperature
850
800
750
700
FLASH MODE
L = 1µH
C_OUT = 2.2µF
650
I_LED = 750mA
V_LED = 890mV
R_FRSET = 10kΩ
600
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Flash Mode I_LED(MAX)
(Dual LEDs) vs. FRSET Resistor
800
L = 1 µH
700
C_OUT = 2.2µF
DUAL LEDs
600
I_LED PER CHANNEL
T_A = 25°C
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80
FRSET RESISTOR (kΩ)
Torch Mode I_LED(MAX)
(Single LED) vs. TRSET Resistor
400
350
300
250
200
150
L = 1 µH
100 C_OUT = 2.2µF
SINGLE LED
50 ^ILED1^+ILED2
T_A = 25°C
0
0 10 20 30 40 50 60 70 80
TRSET RESISTOR (kΩ)
MIC2870
Quiescent Current (Boost Mode)
vs. Temperature
4.50
4.45
BOOST MODE SWITCHING
V_LED1 = V_LED2 = 70mV
4.40
4.35
4.30
4.25
4.20
4.15
4.10
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
Torch Mode I_LED(MAX)
(Dual LEDs) vs. TRSET Resistor
250
L = 1 µH
C_OUT = 2.2µF
200
DUAL LEDs
I_LED PER CHANNEL
T_A = 25°C
150
100
50
0
0 10 20 30 40 50 60 70 80
TRSET RESISTOR (kΩ)
Flash Mode I_LED(MAX)
(Single LED) vs. FRSET Resistor
1600
1400
1200
1000
800
600
L = 1 µH
400 ^{COUT = 2.2µF}
SINGLE LED
200
I_LED1+I_LED2
T_A = 25°C
0
0 10 20 30 40 50 60 70 80
FRSET RESISTOR (kΩ)
September 5, 2013
7
Revision 1.0