TM
MP28372 — DUAL 1.5A, 23V, 1.4MHz STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
0.920
0.18
10
Max
Units
V
Feedback Voltage
VFB
0.901
0.939
4.75V ≤ VIN ≤ 23V
Upper Switch-On Resistance RDS(ON)1
Lower Switch-On Resistance RDS(ON)2
Upper Switch Leakage
Ω
Ω
VEN = 0V, VSW = 0V
10
µA
A
Current Limit (4)
2.5
3.0
Current Limit Gain
Output Current to Comp Pin
Voltage
GCS
1.95
A/V
Error Amplifier Voltage Gain
AVEA
GEA
400
930
V/V
Error Amplifier
Transconductance
630
1230
μA/V
ΔIC = ±10 μA
Oscillator Frequency
fOSC
fSC
1.4
MHz
KHz
Short Circuit Frequency
VFB = 0V
210
Soft-Start Pin Equivalent
Output Resistance
9
kΩ
EN Shutdown Threshold
Voltage
VEN
IEN
ICC > 100μA
0.7
1.0
1.3
V
Enable Pull-Up Current
1.0
μA
EN UVLO Threshold Rising
VUVLO VEN Rising
2.37
2.50
2.62
V
EN UVLO Threshold
Hysteresis
210
mV
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
Maximum Duty Cycle
Minimum On Time
Note:
IOFF
ION
40
2.4
160
70
70
μA
mA
°C
%
VEN ≤ 0.4V
VEN ≥ 3V
2.8
DMAX
VFB = 0.8V
tON
100
ns
4) Equivalent output current = 1.5A ≥ 50% Duty Cycle
2.0A ≤ 50% Duty Cycle
Assumes ripple current = 30% of load current.
Slope compensation changes current limit above 40% duty cycle.
MP28372 Rev. 1.4
12/10/2007
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