MP1593 – 3A, 28V, 385kHz STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
20
Max
30
Units
μA
Shutdown Supply Current
Supply Current
VEN = 0V
VEN =3V, VFB = 1.4V
1.0
1.2
mA
4.75V VIN 28V
Feedback Voltage
VFB
AEA
GEA
1.194
500
1.222
400
1.250
V
VCOMP < 2V
Error Amplifier Voltage Gain
V/V
μA/V
Error Amplifier
Transconductance
800
1120
140
ICOMP = 10μA
High-Side Switch
On-Resistance
RDS(ON)1
RDS(ON)2
100
10
mΩ
Low-Side Switch
On-Resistance
Ω
High-Side Switch Leakage
Current
VEN = 0V, VSW = 0V
0
10
μA
A
Current Limit
4.8
6.2
5.4
385
45
7.6
Current Sense to COMP
Transconductance
GCS
fOSC1
fOSC2
A/V
kHz
kHz
Oscillation Frequency
335
25
435
60
Short Circuit Oscillation
Frequency
VFB = 0V
Maximum Duty Cycle
Minimum Duty Cycle
EN Rising Threshold
EN Threshold Hysteresis
Enable Pull Up Current
DMAX VFB = 1.0V
90
%
%
DMIN
VFB = 1.5V
0
2.05
2.5
150
1.7
2.95
V
mV
μA
VEN = 0V
1.0
2.5
Under-Voltage Lockout
Threshold
VIN Rising
3.75
4.05
210
4.35
V
Under-Voltage Lockout
Threshold Hysteresis
mV
Soft-Start Period
CSS = 0.1μF
10
ms
Thermal Shutdown
160
C
MP1593 Rev. 2.11
1/10/2013
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