MIC45208 查看數據表（PDF） - Micrel
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MIC45208 Datasheet PDF : 36 Pages
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Micrel, Inc.
MIC45208
Electrical Characteristics(5) (Continued)
VPIN = VIN = VEN = 12V, VOUT = 3.3V, VBST − VSW = 5V, TJ = +25ºC. Bold values indicate −40ºC < TJ < +125ºC, unless otherwise noted.
Parameter
Condition
Min.
Typ. Max.
Units
Oscillator
Switching Frequency
VFREQ = VIN, IOUT = 2A
VFREQ = 50%VIN, IOUT = 2A
400
600
750
kHz
350
Maximum Duty Cycle
85
%
Minimum Duty Cycle
Minimum Off-Time
VFB = 1V
0
%
140
200
260
ns
Soft-Start
Soft-Start Time
3
ms
Short-Circuit Protection
Current-Limit Threshold
Short-Circuit Threshold
Current-Limit Source Current
Short-Circuit Source Current
Leakage
SW, BST Leakage Current
FREQ Leakage Current
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
PG Delay Time
PG Low Voltage
Thermal Protection
Overtemperature Shutdown
Overtemperature Shutdown Hysteresis
VFB = 0.79V
VFB = 0V
VFB = 0.79V
VFB = 0V
Sweep VFB from Low-to-High
Sweep VFB from High-to-Low
Sweep VFB from Low-to-High
VFB < 90% × VNOM, IPG = 1mA
TJ Rising
−30
−14
0
mV
−23
−7
9
mV
50
70
90
µA
25
35
45
µA
10
µA
10
µA
85
90
95
%VOUT
6
%VOUT
100
µs
70
200
mV
160
°C
15
°C
February 6, 2015
5
Revision 2.0
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