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MIC2174 데이터시트(PDF) 5 Page - Micrel Semiconductor

부품명 MIC2174
상세설명  Synchronous Buck Controller Featuring Adaptive On-Time Control 40V Input, 300kHz
PDF  27 Pages
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제조업체  MICREL [Micrel Semiconductor]
홈페이지  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2174 데이터시트(HTML) 5 Page - Micrel Semiconductor

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Micrel, Inc.
MIC2174/MIC2174C
September 2010
5
M9999-091310-C
Electrical Characteristics
(4)
VBST − VLX = 5V; TA = 25°C, unless noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Parameter
Condition
Min.
Typ.
Max.
Units
Soft-Start
Soft-Start Period
6
ms
Oscillator
MIC2174
0.225
0.3
0.375
Switching Frequency
MIC2174C
0.202
0.27
0.338
MHz
Measured at DH
(7)
87
Maximum Duty Cycle
MIC2174C
87
%
Minimum Duty Cycle
Measured at DH, VFB = 1V
0
%
FET Drives
DH, DL Output Low Voltage
ISINK = 10mA
0.1
V
DH, DL Output High Voltage
ISOURCE = 10mA
VIN-0.1V
or
VBST-0.1V
V
DH On-Resistance, High State
2.1
3.3
Ω
DH On-Resistance, Low State
1.8
3.3
Ω
DL On-Resistance, High State
1.8
3.3
Ω
DL On-Resistance, Low State
1.2
2.3
Ω
LX Leakage Current
VLX = 40V, VIN = 5.5V,VBST = 45.5V
55
µA
HSD Leakage Current
VLX = 40V, VIN = 5.5V,VBST = 45.5V
21
µA
Thermal Protection
Over-Temperature Shutdown
155
°C
Over-Temperature Shutdown
Hysteresis
10
°C
Shutdown Control
EN Logic Level Low
3V < VIN <5.5V
0.4
0.8
V
EN Logic Level High
3V < VIN <5.5V
0.9
1.2
V
EN Pull-Up Current
50
µA
Note:
7.
The maximum duty cycle is limited by the fixed mandatory off time TOFF of typical 363ns.



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