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MPQ28261 Datasheet(PDF) 3 Page - Monolithic Power Systems

Part # MPQ28261
Description  21V, 3A, 500kHz Synchronous Step-Down Coverter
PDF  20 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MPQ28261 Datasheet(HTML) 3 Page - Monolithic Power Systems

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MPQ28261 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
MPQ28261 Rev. 1.12
www.MonolithicPower.com
3
10/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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
VEN = 0V
1
μA
Supply Current (Quiescent, Not
Switching)
Iq
VEN = 2V, VFB = 1V
0.45
0.7
0.9
mA
MOSFET
HS Switch On Resistance
(6)
HSRDS-ON
120
mΩ
LS Switch On Resistance
(6)
LSRDS-ON
20
mΩ
Switch Leakage
SWLKG
VEN = 0V, VSW = 0V or 12V
0.1
1
μA
Current Limit
Current Limit
ILIMIT
D=40%
4.2
5.2
A
Timer
VFB=550mV , TJ= +25°C
425
500
575
kHz
Oscillator Frequency
fSW
VFB=550mV , TJ= -40°C to
+125°C
400
575
kHz
Minimum On Time
(6)
tON-MIN
60
ns
Maximum Duty Cycle
DMAX
VFB = 550mV
89
92
95
%
Reference And Soft Start
TJ= +25°C
597
603
609
mV
Feedback Voltage
VFB
TJ= -40°C to +125°C
594
612
mV
Feedback Current
IFB
VFB = 650mV
10
50
nA
Soft-Start Current
ISS
VSS=0
9
12
15
μA
Enable and UVLO
EN Rising Threshold
VEN_RISING
1.1
1.3
1.4
V
EN Threshold Hysteresis
VEN_HYS
0.4
V
VEN=2V
2
μA
EN Input Current
IEN
VEN=0V
0.1
μA
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
PGVth-Hi
0.9
VFB
Power-Good Falling Threshold
PGVth-Lo
0.8
VFB
Power-Good Delay
(6)
PGTd
Start Up
0.25
tSS
Power-Good Leakage Current
IPG_LEAK
VPG = 3.3V
200
nA



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