MIC2297 Micrel Semiconductor, MIC2297 Datasheet - Page 5

• Manufacturer Part Number: MIC2297
• Description: 40V PWM Boost Regulator White LED Driver
• Manufacturer: Micrel Semiconductor

Typical Characteristics (continued)
Micrel
Mach 2008
85
80
75
70
65
60
55
50
45
40
35
35
30
25
20
15
10
5
0
0
0
Efficiency for 10 LEDs
20
vs. LED Current
LED CURRENT (mA)
5V
10
vs. Duty Cycle
DUTY CYCLE (%)
LED Current
V
V
IN
IN
4V
40
= 3.2V
= 4.2V
20
3V
PWM = 20kHz
2V peak PWM
R
60
SENSE
V
L = 15µH
IN
30
2V
80
= 3.6V
100
40
0.22µF, 10V
80
75
70
65
60
55
50
45
40
0
C3
V
Efficiency for 9 LEDs
5
IN
vs. LED Current
LED CURRENT (mA)
= 4.2V
10 15 20 25 30 35
V
C1
1µF, 16V
IN
PWM
5
= 3.2V
V
L = 6.8µH
IN
L1 = Murata LQH32CN100K11
= 3.6V
AGND
VIN
EN
REF
BRT
MIC2297BML
PGND
L1
COMP
OVP
SW
FB
C4
0.1µF, 10V
85
80
75
70
65
60
55
50
45
40
35
0
w w w . D a t a S h e e t
Efficiency for 9 LEDs
5 10 15 20 25 30 35 40
vs. LED Current
LED CURRENT (mA)
V
V
IN
IN
= 4.2V
= 3.2V
M9999-032708
MIC2297
L = 15µH
V
C2
0.47µF, 50V
IN
= 3.6V