MIC2297 Micrel Semiconductor, MIC2297 Datasheet - Page 4

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

Typical Characteristics
Micrel
Mach 2008
1200
1000
300
250
200
150
100
800
600
400
200
5.5
4.5
3.5
1.5
1.4
1.3
1.2
1.1
0.9
0.8
0.7
0.6
0.5
50
6
5
4
3
0
1
0
2
0
2
3
3
vs. Switch Voltage
SWITCH CURRENT (mA)
vs. Input Voltage
vs. Input Voltage
BRT VOLTAGE (mV)
Supply Current
vs. BRT Voltage
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Switch Current
4
4
500
BRT Voltage
FB Voltage
5
5
6
6
Not Switching
V
FB
1000
7
7
= 1V
V
10001200
IN
8
8
= 3.6V
9 10
9 10
1500
100
220
215
210
205
200
195
190
300
280
260
240
220
200
180
160
140
120
100
Efficiency for 10 LEDs @ 20mA
99
98
97
96
95
80
78
76
74
72
70
2
2
2
2
I
FSWITCH
3
3
3
3
vs. Input Voltage
vs. Input Voltage
vs. Input Voltage
Max Duty Cycle
vs. Input Voltage
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Switch Voltage
4
4
4
4
FB Voltage
= 0.5A
5
5
5
5
4
6
6
6
6
7
7
7
7
L = 6.8µH
8
8
8
8
9 10
9 10
9 10
9 10
800
700
600
500
400
20
18
16
14
12
10
30
25
20
15
10
80
75
70
65
60
55
50
45
40
5
0
2
2
0
www.DataSheet4U.com
Efficiency for 10 LEDs
3
3
5
V
vs. Input Voltage
vs. Input Voltage
BRT VOLTAGE (mV)
IN
vs. BRT Voltage
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
vs. LED Current
LED CURRENT (mA)
4
4
= 4.2V
10 15 20 25 30 35
LED Current
LED Current
Frequency
V
IN
5
5
= 3.6V
6
6
M9999-032708
R
SENSE
7
7
L = 6.8µH
V
MIC2297
10001200
IN
8
8
= 3.2V
9 10
9 10