MIC45205-1(2014) 查看數據表（PDF） - Micrel
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MIC45205-1 Datasheet PDF : 31 Pages
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Micrel, Inc.
MIC45205
Electrical Characteristics(5) (Continued)
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
Enable Control
EN Logic Level High
1.8
V
EN Logic Level Low
0.6
V
EN Hysteresis
200
mV
EN Bias Current
Oscillator
VEN = 12V
5
10
µA
Switching Frequency
Maximum Duty Cycle
VFREQ = VIN, IOUT = 2A
VFREQ = 50% VIN, IOUT = 2A
400 600
750
kHz
350
85
%
Minimum Duty Cycle
VFB = 1V
0
%
Minimum Off-Time
140 200
260
ns
Soft-Start
Soft-Start Time
5
ms
Short-Circuit Protection
Current-Limit Threshold
VFB = 0.79V
−30 −14
0
mV
Short-Circuit Threshold
VFB = 0V
−23
−7
9
mV
Current-Limit Source Current
Short-Circuit Source Current
Leakage
VFB = 0.79V
VFB = 0V
55
70
85
µA
25
35
45
µA
SW, BST Leakage Current
10
µA
FREQ Leakage Current
10
µA
Power Good (PG)
PG Threshold Voltage
PG Hysteresis
Sweep VFB from Low-to-High
Sweep VFB from High-to-Low
85
90
6
95
% VOUT
% VOUT
PG Delay Time
PG Low Voltage
Thermal Protection
Sweep VFB from Low-to-High
VFB < 90% × VNOM, IPG = 1mA
100
µs
70
200
mV
Overtemperature Shutdown
TJ Rising
Overtemperature Shutdown Hysteresis
160
°C
15
°C
April 15, 2014
5
Revision 1.0
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