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MP28256EL Datasheet(PDF) 3 Page - Monolithic Power Systems

Part # MP28256EL
Description  21V, 3A 500kHz Synchronous Step-Down Coverter
PDF  13 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP28256EL Datasheet(HTML) 3 Page - Monolithic Power Systems

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MP28256 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
MP28256 Rev. 1.0
www.MonolithicPower.com
3
11/3/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (5)
VIN = 12V, TA = 25C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Supply Current (Shutdown)
IIN
VEN = 0V
1
μA
Supply Current (Quiescent)
Iq
VEN = 2V, VFB = 1V
0.7
mA
HS Switch On Resistance
HSRDS-ON
120
mΩ
LS Switch On Resistance
LSRDS-ON
20
mΩ
Switch Leakage
SWLKG
VEN = 0V, VSW = 0V or 12V
0.1
1
μA
Current Limit
ILIMIT
D=40%
4.2
A
Oscillator Frequency
FSW
VFB=750mV
425
500
575
kHz
Minimum On Time
TON-MIN
80
ns
Maximum Duty Cycle
DMAX
VFB = 750mV
85
90
%
Sync Frequency Range
FSYNC
0.3
2
MHz
Feedback Voltage
VFB
591
603
615
mV
Feedback Current
IFB
VFB = 600mV
10
50
nA
EN Rising Threshold
VEN RISING
1.1
1.3
1.6
V
EN Threshold Hysteresis
VEN HYS
0.4
V
EN Input Current
IEN
VEN=2V
2
μA
VEN=0V
0.1
μA
SYNC Input High Level
VHI
1.8
V
SYNC Input Low Level
VLO
0.4
V
SYNC Input Current
ISYNC
VSYNC=6V
0.01
0.1
μA
Soft-start current
ISS
VSS=0
10
μA
VIN
Under
Voltage
Lockout
Threshold Rising
INUVVth
3.8
4.0
4.2
V
VIN
Under
Voltage
Lockout
Threshold Hysteresis
INUVHYS
880
mV
VCC Regulator
VCC
5
V
VCC Load Regulation
Icc=5mA
5
%
Thermal Shutdown
TSD
150
°C



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