MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2.5V, VCOMP = 1.4V, TA= +25C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
0.8
150
1
Max Units
Feedback Voltage
Upper Switch On Resistance
Upper Switch Leakage
Current Limit
VFB
4.5V < VIN < 28V
0.776
0.824
V
mΩ
μA
A
RDS(ON) VBST – VSW = 5V
VEN = 0V, VSW = 0V, VIN = 28V
4.0
4.7
COMP to Current Sense
Transconductance
GCS
9
A/V
Error Amp Voltage Gain (5)
Error Amp Transconductance
Error Amp Min Source current
Error Amp Min Sink current
VIN UVLO Threshold
VIN UVLO Hysteresis
Soft-Start Time (5)
200
60
V/V
µA/V
µA
µA
V
ICOMP = ±3µA
VFB = 0.7V
VFB = 0.9V
40
80
5
–5
2.7
3.0
0.35
1.5
900
12
3.3
V
0V < VFB < 0.8V
RFREQ = 100kꢀ
VEN = 0V
ms
kHz
µA
µA
C
Oscillator Frequency
Shutdown Supply Current
Quiescent Supply Current
Thermal Shutdown
20
No load, VFB = 0.9V
100
150
15
125
Thermal Shutdown Hysteresis
Minimum Off Time (5)
Minimum On Time (5)
C
100
100
1.5
300
ns
ns
EN Up Threshold
1.35
1.65
V
EN Hysteresis
mV
Note:
5) Guaranteed by design.
MP1584 Rev. 1.0
8/8/2011
www.MonolithicPower.com
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