MIC4682_07 Datasheet, PDF (5/15 Pages) Micrel Semiconductor – Precision Current Limit SOIC-8 SuperSwitcher™ Buck Regulator

Micrel, Inc.
Typical Characteristics
T_A = 25°C unless otherwise noted.
MIC4682
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)
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}
0.0210VR_O13U5=T
10M
= 1.0V
20 25
(Pulsed
30 35
Load)
40 45
50
R_ISET (kΩ)
June 2007
Short Circuit Current Limit
vs.
2
Input
Voltageat
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 ^RISET^=50k
0.2
04
R3 = 10M
V_OUT~0V (Pulsed Load)
7 10 13 16 19 22 25 28 31 34
INPUT VOLTAGE (V)
5
Short Circuit Current Limit
vs.
2
Input
Voltageat
T_J
=
25°C
1.8 ^RISET^=10k
1.6
1.4 ^R_ISET^=15.8k
1.2
1
0.8
R_ISET=20k
R_ISET=25k
R_ISET=30k
0.6
0.4
0.2
04
L = 68µH
R3 = 10M
R_ISET=40k
R_ISET=50k
V_OUT~0V (Pulsed Load)
8 12 16 20 24 28 32
INPUT VOLTAGE (V)
M9999-061507