MAX16819_15 Datasheet, PDF (4/9 Pages) Maxim Integrated Products – 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

MAX16819/MAX16820
2MHz High-Brightness LED Drivers with
High-Side Current Sense and 5000:1 Dimming
Typical Operating Characteristics
(VIN = VDIM = 12V, CVCC = 1µF, RSENSE = 0.5Ω connected between IN and CSN. Typical values at TA = +25°C, unless otherwise
noted.)
100
95
90
85
80
75
70
65
60
5
EFFICIENCY vs. VIN
LED 5
LED 4
L = 47µH
10
15
20
25
30
VIN (V)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
4
DRV SWITCHING FREQUENCY
vs. VIN
LED 5
LED 4
LED 3
LED 2
LED 1
L = 47µH
8 12 16 20 24 28
VIN (V)
LED CURRENT VARIATION vs. VIN
2.0
ILED(NOMINAL) = 400mA
1.5
L = 47µH
1.0
LED 1
LED 2
0.5
0
-0.5
-1.0
-1.5
-2.0
5
LED 3
10
LED 4
15
20
VIN (V)
LED 5
25
30
VCC vs. VIN
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
5.0
ILED = 0
7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5
VIN (V)
VCC vs. TEMPERATURE
5.40
5.39
VIN = 24V
5.38
5.37
VIN = 12V
5.36
5.35
5.34
5.33
5.32
5.31
VDIM = 0V
5.30
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SUPPLY CURRENT vs. VIN
300
250
200
150
100
50
0
4.5
VDIM = 0V
8.5 12.5 16.5 20.5 24.5 28.5
VIN (V)
PWM DIMMING AT 200Hz
(10% DUTY CYCLE)
MAX16819 toc07
VIN = 12V, L = 47µH,
1 LED MAX16819
VDIM
2V/div
PWM DIMMING AT 200Hz
(90% DUTY CYCLE)
MAX16819 toc08
VIN = 12V, L = 47µH,
1 LED MAX16819
VDIM
2V/div
0V
ILED
200mA/div
0A
0V
ILED
200mA/div
0A
1ms/div
1ms/div
www.maximintegrated.com
Maxim Integrated │  4