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MP28248 Datasheet(PDF) 3 Page - Monolithic Power Systems

Part No. MP28248
Description  High-Efficiency, Fast-Transient, 3A, 4.2V-20V Input Synchronous Step-down Converter in a QFN12 (2x3mm) Package
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Maker  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
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MP28248 Datasheet(HTML) 3 Page - Monolithic Power Systems

 
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MP28248 – 3A, 4.2V-20V INPUT, FAST-TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER IN QFN12 (2X3mm)
MP28248 Rev 1.0
www.MonolithicPower.com
3
1/5/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Supply current (shutdown)
IIN
VEN = 0V
0
μA
Supply current (quiescent)
IQ
VEN = 2V, VFB = 0.9V
440
490
μA
HS switch-on resistance
(5)
HSRDS-ON
120
mΩ
LS switch-on resistance
(5)
LSRDS-ON
50
mΩ
Switch leakage
SWLKG
VEN = 0V, VSW = 0V or 12V
0
1
μA
Current limit
ILIMIT
After Soft-Start time-out
4
5
A
One-shot on-time
tON
R7 = 600kΩ, VOUT = 1.2V
480
ns
R7 = 200kΩ, VOUT = 1.2V
160
ns
R7 = 120kΩ, VOUT = 1.2V
100
ns
Minimum off time
tOFF
125
ns
Fold-back off Time
(5)
tFB-OCP
IL=ILIM=1 FB=0.6V
5
μs
tFB-SCP
IL=ILIM=1 FB=0.2V
10
μs
OCP hold-off time
(5)
tOC
IL=ILIM=1 FB=0.6V
50
μs
Feedback voltage
VFB
TA=25°C
807
815
823
mV
Feedback current
IFB
VFB=815mV
30
50
nA
EN rising threshold
ENVth-Hi
1.05
1.3
1.6
V
EN threshold hysteresis
ENVth-Hys
500
mV
EN input current
IEN
VEN = 2V
1.5
µA
VEN = 0V
0
µA
Soft-start charging current
ISS
VSS = 0V
14
µA
Soft stop charging current
ISS
VSS=0.815V
4.5
μA
VIN under-voltage lockout
threshold rising
INUVVth
3.1
V
VIN under-voltage lockout
threshold hysteresis
INUVHYS
300
mV
Thermal shutdown
TSD
150
°C
Thermal shutdown hysteresis
TSD-HYS
25
°C
Note:
5) Guaranteed by design and characterization


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