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MP38874 датащи(PDF) 3 Page - Monolithic Power Systems

номер детали MP38874
подробное описание детали  8A, 21V, 600KHz Step-Down Converter with Synchronizable Gate Driver
PDF  11 Pages
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производитель  MPS [Monolithic Power Systems]
домашняя страница  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP38874 датащи(HTML) 3 Page - Monolithic Power Systems

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MP38874 – 8A, 21V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38874 Rev. 1.1
www.MonolithicPower.com
3
10/13/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Feedback Voltage
VFB
4.5V
≤ VIN ≤ 21V
0.795
0.808
0.821
V
Feedback Current
IFB
VFB = 0.8V
10
nA
Switch On Resistance
(5)
RDS(ON)
42
mΩ
Switch Leakage
VEN = 0V, VSW = 0V
0
10
µA
Current Limit
(5)
9.5
A
Oscillator Frequency
fSW
VFB = 0.6V
600
KHz
Fold-back Frequency
VFB = 0V
150
KHz
Maximum Duty Cycle
VFB = 0.6V
85
90
%
Minimum On Time
(5)
tON
100
ns
Under Voltage Lockout Threshold Rising
4.1
V
Under Voltage Lockout Threshold Hysteresis
880
mV
EN Input Low Voltage
0.4
V
En Input High Voltage
1.2
V
VEN = 2V
2
EN Input Current
VEN = 0V
0
µA
Supply Current (Shutdown)
VEN = 0V
0
10
µA
Supply Current (Quiescent)
VEN = 2V, VFB = 1V
1.1
mA
Thermal Shutdown
150
°C
BG Driver Bias Supply Voltage
VCC
4.5
5
V
Gate Driver Sink Impedance
(5)
RSINK
1
2
Ω
Gate Driver Source Impedance
(5)
RSOURCE
4
5.5
Ω
Gate Drive Current Sense Trip Threshold
20
mV
Power Good Threshold
0.74
V
Power Good Threshold Hysteresis
40
mV
PG Pin Level
VPG
PG Sink 4mA
0.4
V
Note:
5) Guaranteed by design.



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