MPQ28261 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted. Typical value is tested at TJ = +25°C.
Parameters
Symbol Condition
Min
Typ
Max
Units
Supply Current
Supply Current (Shutdown)
IIN
Iq
VEN = 0V
1
μA
Supply Current (Quiescent, Not
Switching)
VEN = 2V, VFB = 1V
0.45
0.7
0.9
mA
MOSFET
HS Switch On Resistance(6)
LS Switch On Resistance(6)
Switch Leakage
Current Limit
HSRDS-ON
LSRDS-ON
SWLKG
120
20
mΩ
mΩ
μA
VEN = 0V, VSW = 0V or 12V
D=40%
0.1
1
Current Limit
ILIMIT
4.2
5.2
A
Timer
VFB=550mV , TJ= +25°C
425
400
500
575
575
kHz
kHz
Oscillator Frequency
fSW
VFB=550mV , TJ= -40°C to
+125°C
Minimum On Time(6)
tON-MIN
DMAX
60
92
ns
%
Maximum Duty Cycle
Reference And Soft Start
VFB = 550mV
89
95
TJ= +25°C
597
594
603
609
612
50
mV
mV
nA
Feedback Voltage
VFB
TJ= -40°C to +125°C
VFB = 650mV
VSS=0
Feedback Current
IFB
ISS
10
12
Soft-Start Current
9
15
μA
Enable and UVLO
EN Rising Threshold
EN Threshold Hysteresis
VEN_RISING
VEN_HYS
1.1
1.3
0.4
2
1.4
V
V
VEN=2V
VEN=0V
μA
μA
EN Input Current
IEN
0.1
VIN Under-Voltage Lockout
Threshold Rising
INUVVth
3.8
4.0
4.2
V
VIN Under-Voltage Lockout
Threshold Hysteresis
INUVHYS
880
mV
Power Good
Power-Good Rising Threshold
Power-Good Falling Threshold
Power-Good Delay(6)
PGVth-Hi
PGVth-Lo
PGTd
0.9
0.8
VFB
VFB
tSS
Start Up
0.25
Power-Good Leakage Current
IPG_LEAK
VPG = 3.3V
200
nA
MPQ28261 Rev. 1.12
www.MonolithicPower.com
3
10/10/2013
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