MIC4682 Datasheet, PDF (5/15 Pages) Micrel Semiconductor – PRECISION CURRENT LIMIT SO-8 SUPERSWITCHER BUCK REGULATOR

MIC4682
Typical Characteristics
T_A = 25°C unless otherwise noted.
Efficiency
vs. Output Current
90
80
70
V_IN = 7.5V
60
V_IN = 12V
50
V_IN = 24V
40
V_IN = 30V
30
20
10
V_OUT = 5V
00
0.4 0.8 1.2 1.6
OUTPUT CURRENT (A)
Output Voltage
vs. Current Limit
6
5
T_A = –40°C
4
T_A = 25°C
T_A = 60°C
V_IN = 12V
3 _{RISET = 16.2k}
Load =
2 Continuous
L = 68µH
R3 = 10M
10 _{0.4 0.8 1.2 1.6 2}
CURRENT LIMIT (A)
Current Limit
2 ^{vs. RISET at TJ = –40°C}
1.8
V_IN = 4V
1.6
V_IN = 5V
1.4
V_IN = 12V
1.2
1
0.8
V_IN = 24V
V_IN = 30V
V_IN = 34V
0.6
0.4 ^{L = 68µH}
0.2010VR_O³¹_U5=T
10M
= 1.0V (Pulsed Load)
20 25 30 35 40
45
50
R_ISET (kΩ)
Current Limit
2 ^{vs. RISET at TJ = 125°C}
1.8
V_IN = 4V
1.6
1.4
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 30V
1.2
V_IN = 34V
1
0.8
0.6
0.4 ^{L = 68µH}
0.2010VR_O³¹_U5=T
10M
= 1.0V (Pulsed Load)
20 25 30 35 40
45
50
R_ISET (kΩ)
October 2003
Efficiency
vs. Output Current
80
70
60
V_IN = 5.8V
50
V_IN = 12V
40
V_IN = 24V
30
V_IN = 30V
20
10
V_OUT = 3.3V
00 _{0.4 0.8 1.2 1.6 2}
OUTPUT CURRENT (A)
Output Voltage
vs. Current Limit
6
5
4
V_IN = 24V
3 _{RISET = 16.2k}
Load =
2 Continuous
L = 68µH
R3 = 10M
10 _{0.4 0.8}
T_A = –40°C
T_A = 25°C
T_A = 60°C
1.2 1.6 2
CURRENT LIMIT (A)
Current Limit
2
1.8
1.6
1.4
1.2
1
vs. R_ISET at T_J = 25°C
V_IN = 4V
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 30V
V_IN = 34V
0.8
0.6
0.4 ^{L = 68µH}
0.2010VR_O³¹_U5=T
10M
= 1.0V (Pulsed Load)
20 25 30 35 40
45
50
R_ISET (kΩ)
Short Circuit Current Limit
vs.
2
Input
Voltage
at
T_J
=
–40°C
1.8 ^RISET=10k
1.6 ^RISET=15.8k
1.4 _RISET=20k
1.2 R_ISET=25k
1
0.8
R_ISET=30k
0.6
R_ISET=40k
0.4
L = 68µH ^R_ISET^=50k
0.2
R3 = 10M
V_OUT~0V (Pulsed Load)
04 _{7 10 13 16 19 22 25 28 31 34}
INPUT VOLTAGE (V)
5
Micrel
Efficiency
vs. Output Current
80
70
60
V_IN = 6V
50
40
V_IN = 12V ^VIN ^{= 5V}
30
V_IN = 30V
20
10
V_OUT = 2.5V
00 _{0.4 0.8 1.2 1.6 2}
OUTPUT CURRENT (A)
Output Voltage
vs. Current Limit
6
5
4
3
V_IN = 30V
R_ISET = 16.2k
T_A = –40°C
Load =
2 Continuous
T_A = 25°C
L = 68µH
R3 = 10M
10 _{0.4 0.8}
T_A = 60°C
1.2 1.6 2
CURRENT LIMIT (A)
Current Limit
vs. R_ISET at T_J = 85°C
2
1.8
V_IN = 4V
1.6
V_IN = 5V
1.4
V_IN = 12V
1.2
1
0.8
V_IN = 24V
V_IN = 30V
V_IN = 34V
0.6
0.4 ^{L = 68µH}
0.2010VR_O³¹_U5=T
10M
= 1.0V (Pulsed Load)
20 25 30 35 40
45
50
R_ISET (kΩ)
Short Circuit Current Limit
vs.
2
Input
Voltage
at
T_J
=
25°C
1.8 ^RISET^=10k
1.6
1.4 ^R_ISET^=15.8k
1.2
R_ISET=20k
1
R_ISET=25k
0.8
R_ISET=30k
0.6
0.4
0.2
L = 68µH
R3 = 10M
R_ISET=40k
R_ISET=50k
V_OUT~0V (Pulsed Load)
04 _{8 12 16 20 24 28 32}
INPUT VOLTAGE (V)
M0334-102203