MP1482 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
1
Max
3.0
Units
μA
mA
V
Shutdown Supply Current
Supply Current
VEN = 0V
VEN = 2.0V; VFB = 1.0V
4.75V VIN 18V
1.3
1.5
Feedback Voltage
VFB
0.900
0.923
1.1
0.946
Feedback Overvoltage Threshold
Error Amplifier Voltage Gain (5)
Error Amplifier Transconductance
High-Side Switch On Resistance (5)
Low-Side Switch On Resistance (5)
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
V
AEA
400
800
130
130
V/V
μA/V
mꢀ
mꢀ
μA
A
GEA
IC = 10μA
RDS(ON)1
RDS(ON)2
VEN = 0V, VSW = 0V
Minimum Duty Cycle
From Drain to Source
10
2.4
3.4
1.1
A
COMP to Current Sense
Transconductance
GCS
3.5
A/V
Oscillation Frequency
Fosc1
Fosc2
305
340
100
90
375
2.0
kHz
kHz
%
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time (5)
VFB = 0V
DMAX VFB = 1.0V
220
1.5
ns
EN Shutdown Threshold Voltage
VEN Rising
1.1
V
EN Shutdown Threshold Voltage
Hysteresis
210
mV
EN Lockout Threshold Voltage
EN Lockout Hysterisis
2.2
2.5
2.7
V
210
mV
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysteresis
VIN Rising
3.80
4.10
210
4.40
V
mV
Soft-Start Current
Soft-Start Period
VSS = 0V
CSS = 0.1μF
6
15
160
μA
ms
°C
Thermal Shutdown (5)
Note:
5) Guaranteed by design, not tested.
MP1482 Rev. 1.31
7/9/2012
www.MonolithicPower.com
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