MIC28500 Datasheet, PDF (6/29 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control™ Synchronous DC-DC Buck Regulator

Micrel, Inc.
Typical Characteristics
V_IN Operating Supply Current
vs. Input Voltage
20
VOUT = 3.3V
16
I_OUT = 0A
V_DD = 5V
f_SW = 250kHz
12
8
4
0
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
0.808
0.804
0.800
Feedback Voltage
vs. Input Voltage
V_OUT = 3.3V
V_DD = 5V
I_OUT = 0A
f_SW = 250kHz
0.796
0.792
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
Switching Frequency
vs. Input Voltage
300
250
200
150
V_OUT = 3.3V
V_DD = 5V
I_OUT = 1A
R18=100kΩ
R19=100kΩ
100
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
V_IN Shutdown Current
vs. Input Voltage
5
4
VDD = 5V
3
VEN = 0V
2
1
0
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
Total Regulation
vs. Input Voltage
1.0%
0.8%
0.6%
0.4%
0.2%
VOUT = 3.3V
VDD = 5V
IOUT = 0A to 4A
fSW = 250kHz
0.0%
-0.2%
-0.4%
-0.6%
-0.8%
-1.0%
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
V_DD Operating Supply Current
vs. Temperature
12
VIN = 48V
10
V_OUT = 3.3V
V_DD = 5V
8
I_OUT = 0A
f_SW = 250kHz
6
4
2
0
-50 -25
0
25 50 75 100 125
TEMPERATURE (°C)
MIC28500
V_DD Operating Supply Current
vs. Input Voltage
10
V_OUT = 3.3V
V_DD= 5V
8
f_SW = 250kHz
6
4
2
0
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
Current Limit
vs. Input Voltage
15
V_OUT = 3.3V
12
V_DD = 5V
f_SW = 250kHz
9
6
3
0
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
V_DD Shutdown Current
vs. Temperature
1.0
VIN = 48V
IOUT = 0A
0.8
VDD = 5V
VEN = 0V
0.6
0.4
0.2
0.0
-50
-25 0 25 50 75 100 125
TEMPERATURE (°C)
June 2011
6
M9999-060311-B