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MP28257 Datasheet(PDF) 3 Page - Monolithic Power Systems

Part # MP28257
Description  4A, Fast Transient, 4.2V-to-20V Input Synchronous Step-Down Converter 2mmx3mm QFN12
PDF  16 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP28257 Datasheet(HTML) 3 Page - Monolithic Power Systems

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MP28257 –4A, 4.2V-TO-20V, FAST TRANSIENT, SYNCHRONOUS STEP-DOWN CONVERTER
MP28257 Rev 1.0
www.MonolithicPower.com
3
11/8/2011
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.
Parameters
Symbol
Condition
Min
Typ
Max
Units
Supply current (shutdown)
IIN
VEN = 0V
1
μA
Supply current (quiescent)
IIN
VEN = 2V, VFB = 0.9V
360
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
10
μA
Current limit
ILIMIT
After Soft-Start Time-out
5.5
7
A
One-shot on time
tON
R7 = 300kΩ, VOUT = 1.2V
250
ns
Minimum off time
tOFF
130
150
ns
Fold-back off time
(5)
tFB
ILIM = 1
4.5
μs
OCP hold-off time
(5)
tOC
ILIM = 1
50
μs
Feedback voltage
VFB
TA = 25°C
807
815
823
mV
TA = -40°C to 85°C
803
827
mV
Feedback current
IFB
VFB = 800mV
10
50
nA
Soft start time
tSS
1
ms
EN rising threshold
ENVth-Hi
1.05
1.35
1.6
V
EN threshold hysteresis
ENVth-Hys
500
mV
EN input current
IEN
VEN = 2V
2
μA
VEN = 0V
0
EN Input Current
IEN
VEN=2V
2
μA
VEN=0V
0
Power-good rising threshold
PGVth-Hi
Power-good
90
%
Power-good falling threshold
PGVth-Lo
Fault condition
85
%
Power-good delay
PGTd
500
μs
Power-good sink current
IPG
PG = 0.4V
4
mA
Power-good leakage current
IPG LEAK
VPG = 3.3V
10
nA
VIN
under-voltage
lockout
threshold rising
INUVVth
3.1
V
VIN
under-voltage
lockout
threshold hysteresis
INUVHYS
300
mV
Thermal shutdown
(5)
TSD
150
°C
Thermal shutdown hysteresis
(5)
TSD-HYS
25
°C
Note:
5) Guaranteed by design.



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