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MP28255 датащи(PDF) 3 Page - Monolithic Power Systems

номер детали MP28255
подробное описание детали  21V, 4A, 500kHz Synchronous Step-down Converter
PDF  14 Pages
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производитель  MPS [Monolithic Power Systems]
домашняя страница  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP28255 датащи(HTML) 3 Page - Monolithic Power Systems

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MP28255 – 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP28255 Rev. 1.01
www.MonolithicPower.com
3
3/11/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted. Typical Values are at TA = 25°C.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Supply Current (Shutdown)
IIN
VEN = 0V
0
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
10
µA
Current Limit
(5)
ILIMIT
5
5.6
A
Oscillator Frequency
FSW
VFB = 0.75V
425
500
575
kHz
Fold-back Frequency
FFB
VFB = 300mV
0.25
fSW
Maximum Duty Cycle
DMAX
VFB = 700mV
85
90
%
Sync Frequency Range
FSYNC
0.3
2
MHz
Feedback Voltage
VFB
TA = 25°C
789
805
821
mV
-20
°C < TA < 85°C
787
823
mV
Feedback Current
IFB
VFB = 800mV
10
50
nA
EN Rising Threshold
VEN RISING
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
EN Turn Off Delay
ENTd-Off
5
µs
Power Good Rising Threshold
PGVth-Hi
0.9
VFB
Power Good Falling Threshold
PGVth-Lo
0.7
VFB
Power Good Delay
PGTd
20
µs
Power Good Sink Current
Capability
VPG
Sink 4mA
0.4
V
Power Good Leakage Current
IPG LEAK
VPG = 3.3V
10
nA
Soft-start current
Vss=0V
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
%
Soft-Start Period
CSS=47nF
2
4
6.5
ms
Thermal Shutdown
TSD
150
°C
Note:
5) Guaranteed by design.



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