MIC2194BM 查看數據表（PDF） - Micrel
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MIC2194BM Datasheet PDF : 10 Pages
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MIC2194
Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN) ..................................................... 15V
Digital Supply Voltage (VDD) ........................................... 7V
Enable Pin Voltage (VEN) ............................. –0.3V to +15V
Comp Pin Voltage (VCOMP) ............................ –0.3V to +3V
Feedback Pin Voltage (VFB) .......................... –0.3V to +3V
Current Sense Voltage (VIN –VCS) ................. –0.3V to +1V
Power Dissipation (PD) ..................... 285mW @ TA = 85°C
Ambient Storage Temp ............................ –65°C to +150°C
ESD Rating, Note 3 ...................................................... 2kV
Micrel
Operating Ratings (Note 2)
Supply Voltage (VIN) .................................... +2.9V to +14V
Junction Temperature ....................... –40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
θJA 8-lead SOP ................................................. 140°C/W
Electrical Characteristics
VIN = 5V, VOUT = 3.3V, TJ = 25°C, unless otherwise specified. Bold values indicate –40°C<TJ<+125°C.
Parameter
Condition
Min
Regulation
Feedback Voltage Reference
(1%)
(2%)
1.233
1.22
Feedback Bias Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Total Regulation
Input & VDD Supply
VIN Input Current (IQ)
Shutdown Current (ISD)
Digital Supply Voltage (VDD)
Digital Supply Load Regulation
Undervoltage Lockout
UVLO Hysteresis
5V ≤ VIN ≤ 9V
0mV < (VIN – VCS) < 75mV
5V ≤VIN ≤ 9V, 0mV < (VIN – VCS) < 75mV (±3%)
(excluding external MOSFET gate current)
VEN = 0V
IL = 0
IL = 0 to 1mA
VDD upper threshold (turn on threshold)
1.208
2.82
Enable/UVLO
Enable Input Threshold
0.6
UVLO Threshold
1.4
Enable Input Current
Current Limit
VEN/UVLO = 5V
Current Limit Threshold Voltage VIN – VCS voltage to trip current limit
90
Error Amplifier
Error Amplifier Gain
Current Amplifier
Current Amplifier Gain
Oscillator Section
Oscillator Frequency (fO)
360
Maximum Duty Cycle
VFB = 1.0V
100
Minimum On Time
VFB = 1.5V
Frequency Foldback Threshold Measured on FB
Frequency Foldback Frequency
Typ
1.245
1.245
50
0.15
0.9
1
0.5
3.0
0.1
2.65
100
0.9
1.5
0.2
110
20
3.0
400
165
0.3
90
Max
1.257
1.27
1.282
2
5
3.18
1.2
1.6
5
130
440
Units
V
V
nA
%/V
%
V
mA
µA
V
V
V
mV
V
V
µA
mV
V/V
V/V
kHz
%
ns
V
kHz
April 2005
3
MIC2194
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