MIC28500 Datasheet, PDF (7/29 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control™ Synchronous DC-DC Buck Regulator

Micrel, Inc.
Typical Characteristics (Continued)
V_DD UVLO Threshold
vs. Temperature
4.2
4.1
VIN = 48V
IOUT = 0A
4.0
3.9
Rising
3.8
3.7
3.6
3.5
3.4
Falling
3.3
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
VIN Operating Supply Current
vs. Temperature
20
VIN = 48V
VOUT = 3.3V
16
VDD = 5V
I_OUT = 0A
12
f_SW = 250kHz
8
4
0
-50 -25
0 25 50 75
TEMPERATURE (°C)
100 125
Current Limit
vs. Temperature
15
VIN = 48V
12
VOUT = 3.3V
VDD = 5V
fSW = 250kHz
9
6
3
0
-50 -25
0
25 50 75 100 125
TEMPERATURE (°C)
0.808
0.804
0.800
Feedback Voltage
vs. Temperature
VIN = 48V
VOUT = 3.3V
VDD = 5V
IOUT = 0A
0.796
0.792
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
0.4%
0.3%
0.2%
0.1%
Line Regulation
vs. Temperature
VIN = 30V to
75V
VOUT = 3.3V
VDD = 5V
IOUT = 0A
0.0%
-0.1%
-0.2%
-0.3%
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
Switching Frequency
vs. Output Current
300
-40C
250
200
150
125C
25C
V_IN = 48V
V_OUT = 3.3V
V_DD= 5V
100
0
1
2
3
4
OUTPUT CURRENT (A)
MIC28500
VIN Shutdown Current
vs. Temperature
5
VIN = 48V
4
VDD = 5V
VEN = 0V
IOUT = 0A
3
2
1
0
-50 -25 0
25 50 75 100 125
TEMPERATURE (°C)
0.4%
0.3%
0.2%
0.1%
Load Regulation
vs. Temperature
V_IN = 48V
V_OUT = 3.3V
VDD = 5V
I_OUT = 0A to 4A
f_SW = 250kHz
0.0%
-0.1%
-0.2%
-0.3%
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
EN Bias Current
vs. Temperature
100
V_IN = 48V
V_DD = 5V
80
V_EN = 0V
60
40
20
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
June 2011
7
M9999-060311-B