MP4558 – 1A, 2MHz, 55V STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2.5V, VCOMP = 1.4V, TJ= –40°C to +85°C. Typical Values are at TJ=25°C, unless
otherwise noted.
Parameter
Symbol Condition
Min
Typ
Max Units
TJ=25°C
TJ=25°C
0.780 0.800 0.820
Feedback Voltage
VFB
4.5V < VIN < 55V
V
μA
mΩ
μA
A
0.772
0.829
1.0
Feedback Leakage Current
Upper Switch On Resistance (5)
Upper Switch Leakage
Current Limit
IFB
0.1
175
160
250
330
400
RDS(ON) VBST – VSW = 5V
ISW
ILIM
VEN = 0V, VSW = 0V
TJ=25°C
1
1.3
1.1
1.9
3.5
3.7
Duty cycle ≤60%
COMP to Current Sense
Transconductance
GCS
5.7
A/V
Error Amp Voltage Gain
400
120
10
-10
3.0
V/V
µA/V
µA
µA
V
Error Amp Transconductance
Error Amp Min Source current
Error Amp Min Sink current
ICOMP = ±3µA
VFB = 0.7V
VFB = 0.9V
TJ=25°C
2.7
2.4
3.3
3.6
VIN UVLO Threshold
VIN UVLO Hysteresis
Soft-Start Time (5)
0.35
0.5
1
V
ms
MHz
0V < VFB < 0.8V
RFREQ = 95kΩ
VEN < 0.3V
No load, VFB = 0.9V (no switching)
Hysteresis = 20°C
TJ=25°C
0.8
0.7
1.2
1.3
20
Oscillator Frequency
fSW
Shutdown Supply Current
Quiescent Supply Current
Thermal Shutdown
IS
IQ
12
µA
µA
°C
ns
ns
V
140
150
100
100
1.55
200
Minimum Off Time
tOFF
tON
Minimum On Time (5)
TJ=25°C
1.4
1.3
1.7
1.8
EN Rising Threshold
EN Threshold Hysteresis
320
mV
Notes:
5) Derived from bench characterization. Not tested in production..
MP4558 Rev. 1.01
10/28/2013
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