MIC2179 Datasheet, PDF (5/16 Pages) Micrel Semiconductor – 1.5A Synchronous Buck Regulator

MIC2179
Typical Characteristics
Oscillator Frequency
vs. Temperature
205
200
195
190
185
180
175
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
5.030
5.020
Reference Voltage
vs. Temperature
MIC2179-5.0
5.010
5.000
4.990
4.980
4.970
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Current Limit
vs. Temperature
5.5
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
PWM-Mode
Supply Current
12
10
OUTPUT
SWITCHING
8
6
4
2
0
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
June 1998
1.252
1.250
Reference Voltage
vs. Temperature
MIC2179 [adj.]
1.248
1.246
1.244
1.242
1.240
1.238
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Error-Amplifier Gain
vs. Temperature
19.0
18.5
18.0
17.5
17.0
16.5
16.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
High-Side Switch
On-Resistance
350
125°C
300
85°C
25°C
250
0°C
200
150
100
50
0
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
Skip- and PWM-Mode
Efficiency
95
90
5.4V
PWM
85
80
8.4V
Skip
75
8.4V
70
PWM
5.4V
65
Skip
60
10
100
600
OUTPUT CURRENT (mA)
5
Micrel
3.320
3.315
Reference Voltage
vs. Temperature
MIC2179-3.3
3.310
3.305
3.300
3.295
3.290
3.285
3.280
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Feedback Input Bias Current
vs. Temperature
120
100
80
60
40
20
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Low-Side Switch
On-Resistance
400
350
125°C
85°C
300
25°C
0°C
250
200
150
100
50
0
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
MIC2179