MIC2291 Micrel Semiconductor, MIC2291 Datasheet - Page 4

• Manufacturer Part Number: MIC2291
• Description: 1.2A PWM Boost Regulator Photo Flash LED Driver
• Manufacturer: Micrel Semiconductor

MIC2291
Typical Characteristics
M9999-081104
90
85
80
75
70
65
60
55
50
1.4
1.2
0.8
0.6
0.4
0.2
700
600
500
400
300
200
100
-40 -20 0 20 40 60 80 100 120
1
0
0 20 40 60 80 100 120 140 160
85
99
97
95
93
91
89
87
0
-40 -20 0 20 40 60 80 100 120
-40 -20 0 20 40 60 80 100 120
I
SW
Efficiency 12V OUT
OUTPUT CURRENT (A)
Maximum Duty Cycle
= 1V
TEMPERATURE (°C)
vs. Temperature
Switch Saturation
TEMPERATURE (°C)
vs. Temperature
TEMPERATURE (°C)
vs. Temperature
Current Limit
V
IN
= 3.6V
V
3V
3.6V
4.2V
IN
= 3.6V
110
105
100
300
250
200
150
100
95
90
85
80
50
1.4
1.3
1.2
1.1
0.9
0.8
-40 -20 0 20 40 60 80 100 120
0
-40
1
0
99
97
95
93
91
89
87
85
-40 -20 0 20 40 60 80 100 120
Feedback Voltage vs.
SUPPLY VOLTAGE (V)
vs. Supply Voltage
Switch Saturation
TEMPERATURE (¡C)
5
Maximum Duty Cycle
TEMPERATURE (°C)
vs. Temperature
Temperature
0
TEMPERATURE (°C)
vs. Temperature
Frequency
4
10
40
I
V
SW
15
IN
= 500mA
= 3.6V
80
20
V
IN
= 3.6V
120
25
0.6
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
100
1.28
1.26
1.24
1.22
1.18
1.16
1.14
1.12
700
600
500
400
300
200
100
98
96
94
92
90
88
86
84
82
80
1.3
1.2
1.1
2.5
2.5
0
2.5
0
Maximum Duty Cycle
SUPPLY VOLTAGE (V)
4
vs. Supply Voltage
SWITCH CURRENT (mA)
SUPPLY VOLTAGE
200
SUPPLY VOLTAGE (V)
Saturation Voltage
vs. Supply Voltage
Current Limit vs.
4
Enable Threshold
4
Supply Voltage
vs. Current
5.5
5.5
400
5.5
V
7
600
IN
7
V
V
7
=3.6V
IN
IN
= 3.6V
=3.6V
V
8.5
August, 2004
IN
8.5
800
8.5
= 3.6V
10
1000
10
10
Micrel